Ar15 Barrel Extension New

NOTES: 1. SAE 8620 STEEL, AMS 6274 OR AMS 6276 B .005 DIA EXCEPT AS NOTED 2. ALL DIAMETERS 3. CARBURIZE TOTAL CASE DEPTH .010 TO .015 BEFORE GRIND. SUGGESTED HEAT TREAT PROCEDURE: LIQUID CARBURIZE AT 1550° F FOR 1-1/4 HOURS (CASE DEPTH .010 TO .015) AIR COOL, WASH CLEAN. STRESS RELIEVE AT 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 OR PART TO BE PROCESSED SO THREAD IS NOT CARBURIZED. 4. OPTIONAL STRESS RELIEF PERMITTED IN AREA SHOWN. MAXIMUM STRESS RELIEF TEMPERATURE 900° F. MINIMUM ALLOWABLE HARDNESS IN THIS AREA SHALL BE RH 15N-85.5. 5. GRIND AFTER HEAT TREAT. 6. MINIMUM PERMISSIBLE CASE DEPTH .005 AFTER GRIND. 7. FINISH 63 EXCEPT AS NOTED. 8. FILLET RADII .010, EXCEPT AS NOTED. 9. BREAK SHARP EDGES .005-.010 EXCEPT AS NOTED. 10. MIL-W-13856 APPLIES.

22.50° BSC

32

+.000 .993 - .003 B .004 DIA

R.031 NOTES 5 AND 6 APPLY

.078

32

A

A +.0000 .9987 - .0008

C

1.170

125

.160

B

.990

+.0015 .1235 - .0000 B .0032 TOTAL

1.121

.001 AUXILIARY SECTION A-A B .001 SCALE 2 : 1 K

13/16-16UN-3B .020 X 45 CHAMFER TYP 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.

.907±.001

SECTION A-A DETAIL D SCALE 2 : 1

B .001

.830 X 90 4

UNLESS OTHERWISE SPECIFIED:

.125 R

DIMENSIONS ARE IN INCHES TOLERANCES: FRACTIONAL ANGULAR: MACH BEND TWO PLACE DECIMAL THREE PLACE DECIMAL INTERPRET GEOMETRIC TOLERANCING PER: MATERIAL

NAME DRAWN

USED ON APPLICATION

5

4

MWB 02/19/13

CHECKED

DETAIL K SCALE 2 : 1

TITLE:

BARREL EXTENSION

ENG APPR. MFG APPR. Q.A. COMMENTS:

SIZE DWG. NO.

REV

A

FINISH

SHEET 1 OF 1

SCALE: 1:1 WEIGHT:

DO NOT SCALE DRAWING

3

TANGENT TO .100 DIA BASIC 8 PLACES

DATE

SAE 8620 STEEL

NEXT ASSY

NOTES 5 AND 6 APPLY

.001

22.50°

22.50°

.620

NOTES 5 AND 6 APPLY

K

.790 DIA

D

32

C

+.005 .572 - .000

.760±.002

+.005 .830 - .000

R.015

R.010

+.003 .124 - .000 8 SLOTS EQ SP

30° 2

.020 X 45°

2

1