Sae-j429-vs-Astm-a354-Bd.pdf

3 Identification and Measurement

1: Identifying Cap Screw Grades The Society of Automotive Engineers (SAE) has created specifications that cover chemical and mechanical requirements requirement s for threaded and non-threaded fasteners as are used widely within automotive and other industries. The American Society of Testing and Materials (ASTM) has created specifications that cover chemical and mechanical requirements for fasteners used in engineering applications, such as structural bolts used in building. In the overall MRO (Maintenance Repair Operations) market, the wide majority of the hex head cap screws used are covered by SAE specifications. These cap screws are graded by the SAE by strength levels, and are head-marked to reflect the SAE grade and strength (See Table 3.1.1).

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3: Identification and Measurement: Identifying Cap Screws

Table 3.1.1

Varying cap screw grades, their specifications, details, and identifying markings. Head Markings

Nominal Sizes

Tensile Strength (PSI)

Rockwell Harness

SAE J429 - Gr. 1

1/4 thru 1-1/2

60,000

B70-100

SAE J429 - Gr. 2

1/4 thru 3/4 7/8 thru 1-1/2

74,000 60,000

B80-100 B70-100

1/4 thru 4

60,000

B69-100

 ASTM A307 - Gr. B

1/4 thru 4

60,000

B69-95

SAE J429 - Gr. 5  ASTM A449 - Type 1

1/4 thru 1 over 1 thru 1-1/2

120,000 105,000

C25-34 C19-30

over 1-1/2 thru 3

90,000

B183-B235

1/2 thru 1 over 1 to 1-1/2

120,000 105,000

C24-35 C19-31

1/4 thru 1-1/2

150,000

C33-39

1/4 thru 2-1/2 over 2-1/2 to 4

150,000 140,000

C33-39 C31-39

SAE J429 - Gr. 1 Grade 8.2

Low Carbon Martensite Steel, Quenched and Tempered

1/4 thru 1

150,000

C33-39

 ASTM A490 Type 1

Medium Carbon  Alloy Steel, Quenched and Tempered

1/2 thru 1-1/2

150,000 min 170,000 max

C33-38

 ASTM A490 Type 2

Low Carbon Martensite Steel, Quenched and Tempered

1/2 thru 1

150,000 min 170,000 max

C33-38

 ASTM A490 Type 3

 Atmospheric Corrosion Resistant Steel, Quenched and Tempered

1/2 thru 1-1/2

150,000 min 170,000 max

C33-38

Specifications

 ASTM A307 - Gr. A

 ASTM A449 - Type 1

 A325

 ASTM A325 - Type 1

SAE J429 - Gr. 8

 ASTM A354 - Gr. BD

 A490

 A490

 A490

Material

Low or Medium Carbon Steel

Medium Carbon Steel, Quenched and Tempered

Medium Carbon Steel, Quenched and Tempered

Medium Carbon  Alloy Steel, Quenched and Tempered