BS 1806 [1989]

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BRITISH STANDARD

BS 1806:1989 Incorporating  Amendment No. 1

Specification for

Dimensions of toroidal sealing rings (“O”-rings) and their housings (inch series)

UDC 62 – 762.84:678.074(083.3) 762.84:678.074(083.3)

   I    S 1806:19 :1989 89    B BS 1806    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S This British Standard, having prepared under the    N been direction of the Machinery    E and Components Components Standards Standards Committee, was    H Policy Committee, published under the authority    T published of Board of BSI and    A the Board come comess into into effec effectt on   a 28 April 1989    i   r    b © BSI 07-1999   m   u First published December 1951    h First revision December 1962    t   r Second revision April 1989   o    N   : The following BSI references   y relate to the work on this   p standard:   o Committee reference MCE/11    C Draft for comment 87/72482 DC    d   e ISBN 0 580 17221 X    s   n   e   c    i    L

Committees responsible for this British Standard The preparation of this British Standard was entrusted by the M achinery and Components Standards Policy Committee (MCE/-) to Technical Committee MCE/11, upon which the following bodies were represented: British Compressed Air Society British Fluid Power Association British Hydromechanics Research Association British Industrial Truck Association British Rubber Manufacturers’ Association Engineering Equipment and Materials Users’ Association Ministry of Defence Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited

 Amendments issued since publication  Amd. No.

Date of issue

Comments

6953

May 1992

Indicated by a sideline in the margin

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BS 1806:1989

Contents

Committees responsible Foreword 1 2 3

Scope “O”-rings Housing grooves

1 1 1

Figure 1 — “O”-ring Figure 2 — Housing grooves Figure 3 — Face sealing Figure 4 — Triangular housings

13 13 14 15

Table 1 — Dimensions of “O”-rings of nominal cross section 1/16 in and less Table 2 — Dimensions of “O”-rings of nominal cross section 3/32 in Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in Table 4 — Dimensions of “O”-rings of nominal cross section 3/16 in Table 5 — Dimensions of “O”-rings of nominal cross section 1/4 in Table 6 — Dimensions of housings for diametral sealing Table 7 — Dimensions of housings for static face sealing Table 8 — Dimensions of triangular housings for static face sealings

2 3 5 8 11 14 15 15

Publications referred to

© BSI 07-1999

Page Inside front cover ii

Inside back cover

i

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e ii   c    i    L

Foreword This revised British Standard has been prepared under the direction of the Machinery and Components Standards Policy Committee. It revises and supersedes BS 1806:1962 which is now withdrawn. In view of the continued strong demand for an inch series of “O”-rings it has been decided to revise this standard rather than prepare an extensive amendment of the 1962 edition. Inch dimensions have been retained throughout and metric conversions should be based on BS 350. In this revision the range of “O”-rings has been extended to embrace all the seals listed in British Standard M 48 and also a majority of the sizes listed in SAE  Aerospace Standard AS 568A:19841). The dimensional tolerances on the internal diameter B have in many cases also been increased to reflect current manufacturing practice. It is stressed that the dimensions specified in this standard, although providing the necessary basis for standardization in the manufacture and application of “O”-rings, should not be regarded as providing all the information required for design purposes. Attention is drawn to the desirability of consultation between users and manufacturers of “O”-rings, when a particular application of this type of seal is being considered.  A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1)

 Aerospace size standard for “O”-rings, published by the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096, USA. © BSI 07-1999

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BS 1806:1989

1 Scope

3 Housing grooves

This British Standard specifies the dimensions of elastomeric “O”-rings which are toroidal in shape and are used for sealing components against ingress or egress of fluids under dynamic and static conditions.

3.1 General

The standard also specifies the shape and dimensions of five types of associated housing grooves for the rings when used at pressures not normally exceeding 1 500 lbf/in 2 (100 bar2)). Limits for imperfections are not specified in this standard but information is given in the note to clause 2. lbf/in2,

The profiles, dimensions and tolerances of the housing grooves shall be according to the type of sealing application as follows: a) diametral sealing, Figure 2(a) and Figure 2(b) and Table 6; b) static face sealing, Figure 3 and Table 7; c) triangular housing of static face sealing, Figure 4 and Table 8. 3.2 Tolerances of nominal housing diameter

NOTE 1 At pressures exceeding 1 500 or when the diametral clearances of the grooves are in excess of those specified in this standard, it is recommended that “O”-rings should be used in conjunction with anti-extrusion back-up rings. NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.

The tolerances associated with diameter C  or D3) shall be calculated with respect to the tolerance specified for radial depth F  given in Table 6 and an achievable tolerance for the groove diameters c and d, in accordance with Figure 2(a) and Figure 2(b).

2 “O”-rings

3.3 Extrusion gap

NOTE Surface imperfections. It is important that “O”-ring surface imperfections should be such that they do not affect the sealing properties. Acceptable limits of defined and assessed imperfections on elastomeric toroidal sealing rings are specified in BS 6442.

To maintain an acceptable extrusion gap, the tolerances of the diameter of the mating parts shall be selected with respect to the following:

2.1 Dimensions The dimensions and the tolerances of the “O”-rings shall be in accordance with Table 1 to Table 5. 2.2 Material “O”-rings shall be manufactured from elastomeric materials that are compatible with the fluid contained by the seal, i.e. that the properties of the material are not altered by chemical interaction. NOTE 1 Means of assessing the compatibility of hydraulic fluids with elastomeric materials are specified in BS 4832. NOTE 2 “O”-rings are normally supplied in nitrile rubber but may also be produced in other elastomers, e.g. silicone, fluorocarbon.

2.3 Seal size number “O”-rings shall be identified by the seal size numbers given in Table 1 to Table 5.

2) 3)

a) tolerance of the nominal diameter, C  or D3), calculated in accordance with 3.2; b) the maximum total diametral clearance G (see Table 6), in accordance with Figure 2(a) and Figure 2(b). 3.4 Lead-in chamfer To facilitate assembly and to prevent damage to “O”-rings, components over which the “O”-ring passes during fitting shall incorporate a smooth lead-in chamfer. All associated corners shall be radiused. NOTE Details are shown in Figure 2(a) and Figure 2(b) and dimensions are given in Table 6.

3.5 Surface texture The surface texture of the housing groove and associated surfaces, in accordance with BS 1134-1, shall not exceed the following values: a) dynamic sealing surfaces

0.4  4 m Ra

b) static sealing surfaces

0.8  4 m Ra

c) non-sealing surfaces

1.6  4 m Ra

1 bar = 10 5 N/m2 = 102 kPa. BS 5242-1 specifies tolerances and classes of surface texture for the surfaces of tubular steel cylinder barrels.

© BSI 07-1999

1

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C Table 1 — Dimensions of “O”-rings of nominal cross section 1 / 16 in and less    d Nominal diameters  Actual diametersa   e “O”-ring size    l    l no. Cross section, Internal, B C b  Dc   o  A ± 0.003   r    t in in in in   n d d   o 001 0.040 0.029    c 002 d d 0.050 0.042  ± 0.004   n 003 d d 0.060 0.056     U  ,    8    0 / 0.070 0.070 /64   : 004 /  0.070 0.101 /64    9 005  / 0.070 0.114 /4    0 006  / 007 0.070 0.145 /32     9 008 / 0.070 0.176 /16  11    0 009 / 0.070 0.208 ± 0.005 /32     0 010 / 0.070 0.239 /8     2 /  0.070 0.301 /16    / 011  / 012 0.070 0.364 /2    5  / 013 0.070 0.426 /16    0     / 014 0.070 0.489 / /8    0 0.070 0.551 / / ± 0.007    2 015  , 016 0.070 0.614 / /      t  017 0.070 0.676 / /   a 018  / / 0.070 0.739  ± 0.009 0.070 0.801 / /   a 019    i    r 020 0.070 0.864 / 1     b 021 0.070 0.926 / 1/ 0.070 0.989 1 1/   m 022 0.070 1.051 1/ 1/  ± 0.010   u 023 024 0.070 1.114 1 / 1/     h    t   r 025 0.070 1.176 1/ 1/    o 026 0.070 1.239 1 / 1/ ± 0.011  / 027 0.070 1.301 1 1/     N    f 028 0.070 1.364 1/ 1/    o 029 0.070 1.489 1 / 1/ ± 0.013  030 0.070 1.614 1/ 1/    y    t    i 031 0.070 1.739 1/ 1/    s 0.070 1.864 1/ 2   r 032 ± 0.015    e    v 033    i 0.070 1.989 2 2/    n 034 0.070 2.114 2/ 2/  035 0.070 2.239 2 / 2/ ± 0.018    U  036 0.070 2.364 2 / 2/   ,  037 0.070 2.489 2 / 2/    S / 038 0.070 2.614 2 2/    N 039  0.070 2.739 2 / 2/ ± 0.020     E 040 0.070 2.864 2 / 3     H 041 0.070 2.989 3 3/    T 042 0.070 3.239 ± 0.024 3/ 3/     A 043 0.070 3.489 3/ 3/  044 0.070 3.739 3/ 3/   a    i  0.070 3.989 4 4/   r 045 ± 0.027     b  0.070 4.239 41/4 4/   m 046  047 0.070 4.489 4 / 4/ ± 0.030   u  048 0.070 4.739 4 / 4/    h     t   r 049 0.070 4.989 5 5/    o 050 / 0.070 5.239 5 5/ ± 0.037     N    :   y NOTE 1 The full range of sizes given are suitable for static sealing.   p NOTE 2 For dynamic sealing select only “O”-ring size nos. 004 to 012.   o a See Figure 1.    C bc See Figure 2(b), Figure 3 and Figure 4. See Figure 2(a) and Figure 3.    d d Since “O”-ring sizes nos. 001,002 and 003 are extremely small special care should be taken in the selection of   e housing sizes to achieve an adequate squeeze.   s   n   e 2   c    i    L 5 7 1 5 3 7 1 5 3 7 1 9

64 64 8

32 16

13 15 1 9 5

32 4

16 8

16 2

16

5

8 11 16 3 4 13 16 7 8 15 16

3 7 1 9 5

11

4 13 16 7 8 15 16 1 1

1 1 3 1 5 3 1 5 3 7

6 8

16 4

16 8 2 8 4

3 1 5 3 7 1 5 3 7

1 3 1 5 3 7

8 4 8 2 8 4

1 3 1 5 3 7

1 3

4 2 4

3 5 7 1

3

1 3

2 4

5 7 1

1

8

16 4

16 8

16 2 8 4 8

8 4 8 2 8 4 8

8

1

1

16

8

1

1

32

3

4

3

8 8 8 8 8

8 8 8 8 8

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Table 2 — Dimensions of “O” -rings of nominal cross section 3/32 in “O”-ring size no.

 Actual diametersa Cross section,  A ± 0.003 in

Nominal diameters C b

Internal, B in

 Dc

in

102 103 104 105 106 107 108 109 110 111 112

0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103

0.049 0.081 0.112 0.143 0.174 0.206 0.237 0.299 0.362 0.424 0.487

        ± 0.005       

113

0.103

0.549

± 0.007

114 115 116

0.103 0.103 0.103

0.612 0.674 0.737

  ± 0.009 

117 118 119 120 121 122

0.103 0.103 0.103 0.103 0.103 0.103

0.799 0.862 0.924 0.987 1.049 1.112

    ± 0.010   

123 124 125 126 127 128

0.103 0.103 0.103 0.103 0.103 0.103

1.174 1.237 1.299 1.362 1.424 1.487

129 130 131 132 133

0.103 0.103 0.103 0.103 0.103

134 135 136 137 138 139 140

0.103 0.103 0.103 0.103 0.103 0.103 0.103

in

1

1

3

/32

9

1

/8

5

/16 11 /32 3 /8 13 /32 7 /16 1 /2 9 /16 5 /8 11 /16

/16

/4 /32

5

/32

3

/16

7

/32

1

/4

5

/16

3

/8

7

/16

1

/2

9

/16

3

/4

5

13

11

7

3

15

/8 /16

/4

13

/16 /8 /16

1 11/16 11/8

1 11/16 11/8 13/16 11/4 15/16

    ± 0.012   

13/16 11/4 15/16 13/8 17/16 11/2

13/8 17/16 11/2 19/16 15/8 111/16

1.549 1.612 1.674 1.737 1.799

    ± 0.015   

19/16 15/8 111/16 13/4 113/16

13/4 113/16 17/8 115/16 2

1.862 1.925 1.987 2.050 2.112 2.175 2.237

     ± 0.017    

17/8 115/16 2 21/16 21/8 23/16 21/4

21/16 21/8 23/16 21/4 25/16 23/8 27/16

/16

7

/8 15 /16

NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 102 to 116. a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4. c See Figure 2(a) and Figure 3.

© BSI 07-1999

3

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d  Table 2 — Dimensions of “O” -rings of nominal cross section 3/32 in   e    l    l “O”-ring Nominal diameters  Actual diametersa   o size no.   r    t Cross section, Internal, B C b  Dc   n  A ± 0.003   o in in in in   c   n 141 5 1 0.103 2.300 2 /16 2 /2     U 142 3  0.103 2.362 2 /8 29/16  ,  0.103 2.425 27/16 25/8    8 143  ± 0.020     0 0.103 2.487 21/2 211/16   : 144     9 145  0.103 2.550 29/16 23/4    0 146  0.103 2.612 25/8 213/16     9 0.103 2.675 211/16 27/8    0 147  3     0 148 0.103 2.737 2 /4 215/16 ± 0.022     2 0.103 2.800 213/16 3    / 149  7    5 150  0.103 2.862 2 /8 31/16    0    / 151 0.103 2.987 3 33/16     0 152 0.103 3.237 31/4 37/16  ± 0.024    2  1 0.103 3.487 3 /2 311/16  , 153      t 154 0.103 3.737 33/4 315/16    a  ± 0.028 155 0.103 3.987 4 43/16    a    i   r 156 0.103 4.237 41/4 47/16  1    b 157 0.103 4.487 4 /2 411/16  ± 0.030    m 158 0.103 4.737 43/4 415/16   u 159 0.103 4.987 5 53/16     h    t  0.103 5.237 51/4 57/16   r 160    o 161 0.103 5.487 51/2 511/16  ± 0.035 3    N 162  0.103 5.737 5 /4 515/16     f 163 0.103 5.987 6 63/16    o 0.103 6.237 61/4 67/16   y 164     t 1    i 165  0.103 6.487 6 /2 611/16 ± 0.040   s    r 166 0.103 6.737 63/4 615/16    e 167  0.103 6.987 7 73/16   v    i 0.103 7.237 71/4 77/16   n 168   0.103 7.487 71/2 711/16    U 169 ± 0.045  3 0.103 7.737 7 /4 715/16  , 170     S 171  0.103 7.987 8 83/16    N 172 0.103 8.237 81/4 87/16     E 173 1  0.103 8.487 8 /2 811/16 ± 0.050     H 174 0.103 8.737 83/4 815/16     T 175  0.103 8.987 9 93/16    A 0.103 9.237 91/4 97/16   a 176     i 0.103 9.487 91/2 911/16  ± 0.055   r 177  3    b 178 0.103 9.737 9 /4 915/16   m NOTE 1 The full range of sizes given are suitable for static sealing.   u NOTE 2 For dynamic sealing select only “O”-ring size nos. 102 to 116.    h a See Figure 1.    t   r b See Figure 2(b), Figure 3 and Figure 4.   o c See Figure 2(a) and Figure 3.    N   :   y   p   o    C    d   e   s   n   e 4   c    i    L

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in “O”-ring size no.

 Actual diametersa Cross section,  A ± 0.004 in

Nominal diameters C b

Internal, B in

201 202 203 204 205 206

0.139 0.139 0.139 0.139 0.139 0.139

0.171 0.234 0.296 0.359 0.421 0.484

207

0.139

0.546

 Dc

in

in

     ± 0.005     ± 0.007

3

7

1

/16

1

5

/2

9

3

/16

5

5

/16 /4 /16 /8

7

/16

1

/2

9

/16

/8 11 /16 3 /4 13 /16 7

208 209

0.139 0.139

0.609 0.671

  

210 211 212 213 214 215

0.139 0.139 0.139 0.139 0.139 0.139

0.734 0.796 0.859 0.921 0.984 1.046

     ± 0.010    

1 11/16

1 11/16 11/8 13/16 11/4 15/16

216 217 218 219 220 221

0.139 0.139 0.139 0.139 0.139 0.139

1.109 1.171 1.234 1.296 1.359 1.421

     ± 0.012    

11/8 13/16 11/4 15/16 13/8 17/16

13/8 17/16 11/2 19/16 15/8 111/16

222 223 224

0.139 0.139 0.139

1.484 1.609 1.734

  ± 0.015 

11/2 15/8 13/4

13/4 17/8 2

225 226 227

0.139 0.139 0.139

1.859 1.984 2.109

  ± 0.018 

17/8 2 21/8

21/8 21/4 23/8

228 229 230 231

0.139 0.139 0.139 0.139

2.234 2.359 2.484 2.609

   ± 0.020  

21/4 23/8 21/2 25/8

21/2 25/8 23/4 27/8

232 233 234 235 236 237 238

0.139 0.139 0.139 0.139 0.139 0 139 0.139

2.734 2.859 2.984 3.109 3.234 3.359 3.484

     ± 0.024    

23/4 27/8 3 31/8 31/4 33/8 31/2

3 31/8 31/4 33/8 31/2 35/8 33/4

± 0.009

/8 11 /16 3

/4 13 /16 7 /8 15 /16

/8 15 /16

NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 201 to 222. a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4. c See Figure 2(a) and Figure 3.

© BSI 07-1999

5

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d  Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in   e    l    l “O”-ring Nominal diameters  Actual diametersa   o size no.   r    t Cross section, Internal, B C b  Dc   n  A ± 0.004   o   c in in in in   n 0.139 3.609 35/8 37/8    U 239  3  0.139 3.734 3 /4 4  , 240  7    8 241 0.139 3.859 3 /8 41/8  ± 0.028    0    : 242 0.139 3.984 4 41/4     9 243 1 0.139 4.109 4 /8 43/8     0 0.139 4.234 41/4 41/2    9 244      0 245 0.139 4.359 43/8 45/8     0 246 1 0.139 4.484 4 /2 43/4  ± 0.030    2    / 247  0.139 4.609 45/8 47/8     5 248 0.139 4.734 43/4 5     0    /    0 249 0.139 4.859 47/8 51/8     2 250 0.139 4.984 5 51/4   , 1  0.139 5.109 5 /8 53/8   - 251    t  0.139 5.234 51/4 51/2   a 252   0.139 5.359 53/8 55/8   a 253 ± 0.035     i 1 0.139 5.484 5 /2 53/4   r 254     b 255  0.139 5.609 55/8 57/8  3 0.139 5.734 5 /4 6   m 256  7   u 257  0.139 5.859 5 /8 61/8    h     t 0.139 5.984 6 61/4   r 258   o 259 0.139 6.234 61/4 61/2  1    N 260 0.139 6.484 6 /2 63/4  ± 0.040    f 261  0.139 6.734 63/4 7   o  262 0.139 6.984 7 71/4    y    t    i 263 0.139 7.234 71/4 71/2   s    r 264 0.139 7.484 71/2 73/4  ± 0.045   e 265  3 0.139 7.734 7 /4 8   v     i 0.139 7.984 8 81/4    n 266    U 267 0.139 8.234 81/4 81/2   , 268  0.139 8.484 81/2 83/4 ± 0.050    S 269  3 0.139 8.734 8 /4 9     N 270 0.139 8.984 9 91/4     E 0.139 9.234 91/4 91/2    H 271   0.139 9.484 91/2 93/4    T 272  3    A 273 0.139 9.734 9 /4 10  ± 0.055  0.139 9.984 10 101/4   a 274    i  1   r 275 0.139 10.484 10 /2 103/4     b 1 The full range of sizes given are suitable for static sealing.   m NOTE 2 For dynamic sealing select only “O”-ring size nos. 201 to 222.   u NOTE a See Figure 1.    h b    t See Figure 2(b), Figure 3 and Figure 4.   r c See Figure 2(a) and Figure 3.   o    N   :   y   p   o    C    d   e   s   n   e 6   c    i    L

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

 Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in  Actual diametersa

“O”-ring size no. Cross section,  A ± 0.004 in

276 277 278 279 280 281

0.139 0.139 0.139 0.139 0.139 0.139

Nominal diameters

Internal, B in

10.984 11.484 11.984 12.984 13.984 14.984

     ± 0.065    

11 111/2 12 13 14 15

C b

 Dc

in

in

111/4 113/4 121/4 131/4 141/4 151/4

NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 201 to 222. a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4. c See Figure 2(a) and Figure 3.

© BSI 07-1999

7

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d Table 4 — Dimensions of “O”-rings of nominal cross section 3/16 in   e    l    l “O”-ring  Actual diametersa Nominal diameters   o size no.   r Cross section, Internal, B C b  Dc    t  A ± 0.005   n   o in in in in   c 7 13   n 309 0.210 0.412 /16 /16   ± 0.005 1 7    U 310 0.210 0.475 /2 /8   , 9 15 0.210 0.537 ± 0.007 /16 /16    8 311    0 5   : 312 0.210 0.600 /8 1  ± 0.009    9 313 11/ 0.210 0.662 11/16  16    0 3 0.210 0.725 /4 11/8     9 314 13  0.210 0.787 /16 13/16    0 315  7    0 316 0.210 0.850 11/4 /8     2 ± 0.010  15    / 317 0.210 0.912 /16 15/16     5 318  0.210 0.975 1 13/8    0     / 319 0.210 1.037 11/16 17/16     0    2 320 0.210 1.100 11/8 11/2   , 321  0.210 1.162 13/16 19/16      t  0.210 1.225 11/4 15/8   a 322  ± 0.012 5  323 0.210 1.287 1 /16 111/16   a     i 0.210 1.350 13/8 13/4   r 324     b 0.210 1.475 11/2 17/8    m 325 5  0.210 1.600 1 /8 2   u 326 ± 0.015  3 327 0.210 1.725 1 /4 21/8    h     t   r 328  0.210 1.850 17/8 21/4   o 0.210 1.975 2 23/8     N 329  0.210 2.100 21/8 21/2    f 330 ± 0.018  1   o 331 0.210 2.225 2 /4 25/8   0.210 2.350 23/8 23/4   y 332    t    i 333 0.210 2.475 21/2 27/8   s    r 334 5  0.210 2.600 2 /8 3   e ± 0.020  3 0.210 2.725 2 /4 31/8   v 335     i 7 0.210 2.850 2 /8 31/4    n 336    U 337 0.210 2.975 3 33/8   , 338  0.210 3.100 31/8 31/2    S 339  0.210 3.225 31/4 35/8  ± 0.024    N  0.210 3.350 33/8 33/4    E 340  0.210 3.475 31/2 37/8     H 341    T 342 0.210 3.600 35/8 4  3    A 343  0.210 3.725 3 /4 41/8  7   a 344 0.210 3.850 3 /8 41/4  ± 0.028    i   r  0.210 3.975 4 43/8    b 345  346 0.210 4.100 41/8 41/2    m   u NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 309 to 349.    h    t   r ab See Figure 1.   o See Figure 2(b), Figure 3 and Figure 4.    N c See Figure 2(a) and Figure 3.   :   y   p   o    C    d   e   s   n   e 8   c    i    L

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

 Table 4 — Dimensions of “O”-rings of nominal cross section 3/16 in “O”-ring size no.

 Actual diametersa Cross section,  A ± 0.005

Nominal diameters C b

Internal, B

in

in

 Dc

in 1

in 5

347 348 349 350 351 352

0.210 0.210 0.210 0.210 0.210 0.210

4.225 4.350 4.475 4.600 4.725 4.850

     ± 0.030    

4 /4 43/8 41/2 45/8 43/4 47/8

4 /8 43/4 47/8 5 51/8 51/4

353 354 355 356 357 358 359 360 361

0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210

4.975 5.100 5.225 5.350 5.475 5.600 5.725 5.850 5.975

       ± 0.037      

5 51/8 51/4 53/8 51/2 55/8 53/4 57/8 6

53/8 51/2 55/8 53/4 57/8 6 61/8 61/4 63/8

362 363 364 365

0.210 0.210 0.210 0.210

6.225 6.475 6.725 6.975

   ± 0.040  

61/4 61/2 63/4 7

65/8 67/8 71/8 73/8

366 367 368 369

0.210 0.210 0.210 0.210

7.205 7.475 7.725 7.975

   ± 0.045  

71/4 71/2 73/4 8

75/8 77/8 81/8 83/8

370 371 372 373

0.210 0.210 0.210 0.210

8.225 8.475 8.725 8.975

   ± 0.050  

81/4 81/2 83/4 9

85/8 87/8 91/8 93/8

374 375 376 377

0.210 0.210 0.210 0.210

9.225 9.475 9.725 9.975

   ± 0.055  

91/4 91/2 93/4 10

95/8 97/8 101/8 103/8

378 379

0.210 0.210

10.475 10.975

  

101/2

107/8

11

113/8

380 381 382

0.210 0.210 0.210

11.475 11.975 12.975

  ± 0.065 

111/2 12 13

117/8 123/8 133/8

383 384

0.210 0.210

13.975 14.975

  

14 15

143/8 153/8

± 0.060

± 0.070

NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 309 to 349. a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4. c See Figure 2(a) and Figure 3.

© BSI 07-1999

9

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d  Table 4 — Dimensions of “O”-rings of nominal cross section 3/16 in   e    l    l “O”-ring Nominal diameters  Actual diametersb   o size no.   r    t Cross section, Internal, B C b  Dc   n  A ± 0.005   o in in in in   c   n 385 3 0.210 15.955 ± 0.075 16 16 /8    U 0.210 16.955 ± 0.080 17 173/8  , 386    8 387 0.210 17.955 ± 0.085 18 183/8    0   : 0.210 18.955 ± 0.090 19 193/8    9 388    0 389 0.210 19.955 20 203/8   ± 0.095    9 390 0.210 20.955 21 213/8     0 0.210 21.955 ± 0.100 22 223/8    0 391    2 0.210 22.940 ± 0.105 23 233/8    / 392    5 393 0.210 23.940 ± 0.110 24 243/8    0    / 394 0.210 24.940 ± 0.115 25 253/8    0    2 395 0.210 25.940 ± 0.120 26 263/8  ,   - NOTE 1 The full range of sizes given are suitable for static sealing.    t 2 For dynamic sealing select only “O”-ring size nos. 309 to 349.   a NOTE a See Figure 1.   a b See Figure 2(b), Figure 3 and Figure 4.    i   r c    b See Figure 2(a) and Figure 3.   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e 10   c    i    L

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Table 5 — Dimensions of “O”-rings of nominal cross section 1/4 in “O”-ring size no.

 Actual diametersa Cross section,  A ± 0.006

Nominal diameters

Internal, B

in

in 1

C b

 Dc

in

in

425 426 427 428

0.275 0.275 0.275 0.275

4.475 4.600 4.725 4.850

   ± 0.033  

4 /2 45/8 43/4 47/8

5 51/8 51/4 53/8

429 430 431 432 433 434 435 436 437

0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275

4.975 5.100 5.225 5.350 5.475 5.600 5.725 5.850 5.975

       ± 0.037      

5 51/8 51/4 53/8 51/2 55/8 53/4 57/8 6

51/2 55/8 53/4 57/8 6 61/8 61/4 63/8 61/2

438 439 440 441

0.275 0.275 0.275 0.275

6.225 6.475 6.725 6.975

   ± 0.040  

61/4 61/2 63/4 7

63/4 7 71/4 71/2

442 443 444 445

0.275 0.275 0.275 0.275

7.225 7.475 7.725 7.975

   ± 0.045  

71/4 71/2 73/4 8

73/4 8 81/4 81/2

445A  446 446A  447 447A  448 448A  449

0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275

8.225 8.475 8.725 8.975 9.225 9.475 9.725 9.975

      ± 0.055     

81/4 81/2 83/4 9 91/4 91/2 93/4 10

83/4 9 91/4 91/2 93/4 10 101/4 101/2

449A  450 450A  451 451A  452 452A  453 454 455

0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275

10.225 10.475 10.725 10.975 11.225 11.475 11.725 11.975 12.475 12.975

       ± 0.060      

101/4 101/2 103/4 11 111/4 111/2 113/4 12 121/2 13

103/4 11 111/4 111/2 113/4 12 121/4 121/2 13 131/2

NOTE 1 The full range of sizes given are suitable for static sealing. NOTE 2 For dynamic sealing select only “O”-ring size nos. 425 to 445. a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4. c See Figure 2(a) and Figure 3.

© BSI 07-1999

11

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d  Table 5 — Dimensions of “O”-rings of nominal cross section 1/4 in   e    l    l “O”-ring Nominal diameters  Actual diametersa   o size no.   r Cross section, Internal, B    t C b  Dc  A ± 0.006   n   o in in in in   c   n 456 0.275 13.475 131/2 14     U 457 0.275 13.975 14 141/2   ,  0.275 14.475 141/2 15    8 458  ± 0.070     0 459 0.275 14.975 15 151/2   :     9 460 0.275 15.475 151/2 16     0 461 0.275 15.955 16 161/2   ± 0.075    9 462 0.275 16.455 161/2 17     0    0 463 0.275 16.955 ± 0.080 17 171/2    2    / 464 0.275 17.455 171/2 18     5 465 0.275 17.955 ± 0.085 18 181/2     0     / 466 0.275 18.455 181/2 19    0 0.275 18.955 19 191/2     2 467  ± 0.090  , 468 0.275 19.455 191/2 20       t 469 0.275 19.955 20 201/2    a  ± 0.095 470 0.275 20.955 21 211/2    a    i   r 471 0.275 21.955 ± 0.100 22 221/2    b 472 0.275 22.940 ± 0.105 23 231/2   m 473 0.275 23.940 ± 0.11 24 241/2   u    h 474 0.275 24.940 ± 0.115 25 251/2    t   r 0.275 25.940 ± 0.120 26 261/2   o 475    N NOTE 1 The full range of sizes given are suitable for static sealing.    f NOTE 2 For dynamic sealing select only “O”-ring size nos. 425 to 445.   o a See Figure 1. b See Figure 2(b), Figure 3 and Figure 4.   y    t    i c See Figure 2(a) and Figure 3.   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e 12   c    i    L

© BSI 07-1999

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Figure 1 — “O”-ring

Figure 2 — Housing grooves

© BSI 07-1999

13

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d Table 6 — Dimensions of housings for diametral sealing   e    l    l “O”-ring Diameter, C  Diameter, D Groove Radial depth, F  Minimum Maximum 2 T    o cross-sectional diametral width,   r    t squeeze of Size no. Cross Max. Min. clearance, E ± 0.005   n section “O”-ringa G   o diameter,   c  A   n in in in in in in in    U  , Equal to Equal to 0.094 0.062 0.060 0.005 0.005 0.170    8 004 to 050 0.070 nominal nominal    0 0.141 0.094 0.091 0.006 0.005 0.240   : 102 to 178 0.103 diameter C  diameter D    9 201 to 281 0.139 0.188 0.125 0.122 0.010 0.006 0.320 of Table 1 to of Table 1 to    0 309 to 395 0.210 0.281 0.188 0.184 0.017 0.007 0.460 Table 5 Table 5    9 0.375 0.250 0.245 0.019 0.008 0.600    0 425 to 475 0.275    0 a    2    / This is included for reference purposes only.    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t Figure 3 — Face sealing   r   o    N   :   y   p   o    C    d   e   s   n   e 14 © BSI 07-1999   c    i    L

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Table 7 — Dimensions of housings for static face sealing “O”-ring Size no.

Cross section diameter, A

Diameter, C ± 0.010

Diameter,  D ± 0.010

Groove depth, H ± 0.005

Minimum recess width,  K 

Minimum cross-sectional squeeze of “O”-ringa

in

in

in

in

004 to 050

0.070

102 to 178

0.103

201 to 281

0.139

309 to 395

0.210

425 to 475

0.275

a

Equal to nominal diameter C  of Table 1 to Table 5

Equal to nominal diameter D of Table 1 to Table 5

0.056

0.095

0.006

0.086

0.140

0.009

0.115

0.190

0.015

0.175

0.280

0.025

0.236

0.370

0.028

This is included for reference purposes only.

Figure 4 — Triangular housings Table 8 — Dimensions of triangular housings for static face sealings “O”-ring Size no.

Cross section diameter,  A

Diameter, C 

Maximum diametral clearance, G

Chamfer, M  +0.005  – 0

Maximum radius on spigot, R

Minimum spigot length, L

in

in

in

in

in

004 to 050 102 to 178 201 to 281

0.070 0.103 0.139

309 to 395

0.210

425 to 475

0.275

© BSI 07-1999

Equal to nominal diameter C of Table 1 to Table 5

0.005 0.005 0.006

0.095 0.145 0.195

0.030

3

0.040

1/

0.060

5

/16 4

/16

0.007

0.295

0.090

7

0.008

0.395

0.100

9

/16 /16

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   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e 16   c    i    L

blank

   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   :   y   p   o    C    d   e   s   n   e   c    i    L

BS 1806:1989

Publications referred to BS 350, Conversion factors and tables4). BS 1134, Method for the assessment of surface texture. BS 1134-1, Method and instrumentation. BS 4832, Specification for compatibility between elastomeric materials and hydraulic fluids. BS 5242, Tubes for fluid power cylinder barrels. BS 5242-1, Specification for steel tubes with specially finished surfaces. BS 5242-2, Specification for non-ferrous metallic tubes with specially finished bores. BS 6442, Specification for limits of surface imperfections on elastomeric toroidal sealing rings (“O”-rings). British Standard BS M 48, Specification for dimensions of elastomeric toroidal sealing rings for aerospace use — inch series 4). SAE Aerospace Standard AS 568A; 1984, Aerospace size standard for “O”-rings5).

4) 5)

Referred to in the foreword only. Published by the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096, USA.

© BSI 07-1999

   I    S    B BS 1806:1989    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    8    0   :    9    0    9    0    0    2    /    5    0    /    0    2  ,      t   a   a    i   r    b   m   u    h    t   r   o    N    f   o   y    t    i   s   r   e   v    i   n    U  ,    S    N    E    H    T    A   a    i   r    b   m   u    h    t   r   o    N   : BSI   y 389 Chiswick High Road   p   o London    C W4 4AL    d   e   s   n   e   c    i    L

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