Ar15 Barrel Extension New

NOTES:

1. SAE 8620 STEEL, AMS 6274 OR AMS 6276 2. ALL DIAMETERS B .005 DIA DIA EXCEPT AS NOTED 3. CARBURIZE TOTAL CASE DEPTH .010 .010 TO .015

+.000 .993 - .003

32 R.031

B .004 .004 DIA DIA

BEFORE GRIND. SUGGESTED HEAT TREAT

NOTES 5 AND 6 APPLY

PROCEDURE: LIQUID CARBURIZE CARBURIZE AT AT 1550° 1550° F FOR 1-1/4 HOURS (CASE DEPTH .010 .010 TO .015) 850° F FOR 1 HOUR. ROUGH MACHINE, REHEAT TO 1450 DEGREES F, OIL QUENCH, TEMPER AT 350° F FOR 1 HOUR. THREAD TO BE MASKED MASKED OR OR

32

PART TO BE PROCESSED SO THREAD IS NOT

 

30° 2

.020 X 45°

.078

AIR COOL, WASH CLEAN. STRESS RELIEVE AT

A

A

CARBURIZED.

4. OPTIONAL STRESS RELIEF PERMITTED IN AREA

SHOWN. MAXIMUM STRESS RELIEF TEMPERATURE 900° F. MINIMUM ALLOWABLE ALLOWABLE HARDNESS IN THIS AREA SHALL BE RH 15N-85.5.

+.0000 .9987 - .0008

 

1.170

5. GRIND AFTER HEAT TREAT.

6. MINIMUM PERMISSIBLE CASE DEPTH .005 AFTER GRIND. 63 7. FINISH EXCEPT AS NOTED. 8. FILLET RADII .010, EXCEPT AS NOTED. NOTED. 9. BREAK SHARP EDGES .005-.010 EXCEPT AS NOTED. 10. MIL-W-13856 APPLIES.

C

22.50° BSC

R.015

125

.160

B

+.005 .830 - .000

+.0015 .1235 - .0000

.990

B .0032 TOTAL TOTAL

1.121

32

C  .620

NOTES 5 AND 6 APPLY

NOTES 5 AND

6 APPLY

 R.010

+.003 .124 - .000

.001

+.005 .572 - .000

8 SLOTS EQ SP

K

.001 AUXILIARY SECTION A-A B .001 .001

.830 X 90 4

.790 DIA

D

B .001 .001

K

SCALE 2 : 1

 .760±.002 13/16-16UN-3B .020 X 45 CHAMFER CHAMFER TYP TO TO MINOR DIA .745-.7533 THEORETICAL PROJECTED PITCH DIA .7719-.7766 SHARP CORERS MAJJOR DIA .8125 MIN PITCH DIA MUST BE PARALLEL TO AXIS -B- WITHIN .020 IN 10 INCHES SLOTS -D- PERMISSIBLE ON MINOR DIA.

22.50°

 22.50°

 .907±.001

SECTION A-A

UNLESS OTHERWISE SPECIFIED:

.125 R DETAIL D

DIMENSIONS ARE IN INCHES

SCALE 2 : 1

DRAWN

TOLERANCES: CHECKED

FRACTIONAL ANGULAR: MACH  

BEND

TWO PLACE DECIMAL

MFG APPR.

INTERPRET GEOMETRIC

Q.A.

TOLERANCING PER:

MATERIAL

SAE 8620 STEEL FINISH USED ON

NEXT ASSY

APPLICATION

ENG APPR.

THREE PLACE DECIMAL

DO NOT SCALE DRAWING

NAME

DATE

MWB

02/19/13

TANGENT TO .100 DIA BASIC 8 PLACES

DETAIL K

SCALE 2 : 1

TITLE:

BARREL EXTENSION

COMMENTS:

SIZE

DWG. NO.

REV

A SCALE: 1:1 WEIGHT:

SHEET 1 OF 1