M1 Garand Known Heat Lot Codes Post War
Bolt 6528287-SA
US1 4,20X,XXX to 4,22X,XXX
J1B 4,20X,XXX to 4,22X,XXX
US2 4,24X,XXX to 4,28X,XXX
A-10 4,24X,XXX
to 5,32X,XXX
A11 4,24X,XXX to 5,32X,XXX
A13 5,29X,XXX to 5,43X,XXX
A14
5,33X,XXX to 5,86X,XXX
A15 5,42X,XXX to 5,96X,XXX
B-2-O
Z1 5,8XX,XXX to 5,900,000
Z2 5,8XX,XXX to 5,900,000
Z3
5,8XX,XXX to 5,899,000
A16 5,9XX,XXX to 5,999,000
Z4B 6,08X,XXX to 6,090,000
Y01
5,79X,XXX to 6,09X,XXX
Y02 6,08X,XXX to 6,09X,XXX
J-1-A
M1 Garand Known Heat Lot codes WW2
Bolt D28287-1 may 1939 to may 1940
Serial # 3,000 to 52,000
C1
J1
J4
J6 May 1939 to Feb 1940
J3B Sep
1939
J7 Apr 1940
J-15-K
J-15-H
D5
D1 May 1940
Bolt D28287-2SA june 1940
to mar 1942
Serial # 270,000-550,000
B1 May 1940
B2 July 1940
C11 Aug 1940 to Dec 1940
T1 Sep 1940 to
nov 1940
C12A Oct 1940
C12B
C12 Dec 1940
C13
J8 Mar 1941 tp May 1941
RE5A July 1941
RE1 Aug 1941 to Sep 1942
RE4E
RE4D Nov 1941
RE4A Dec 1941
RE2
Feb 1942
RE5B March 1942
RE5C
RE5
J9A
J9B
Bolt D28287-12SA mar 1942 to dec 1944
Serial# 600,000-3,300,000
RE4E
RE5B Mar 1942 to Jul 1942
RE6B Jun
1942 to Oct 1942
RE5C 1942
W9B Aug 1942
W10A
W10B July 1943
S-11<> Oct 1942 to Dec 1942
A8W Nov
1942
B4A Nov 1942 to Dec 1942
B4B
S-04<> Nov 1942 to Dec 1944
B3
B8 Feb 1943 to Jun 1943
B10<>
S-06<> Aug 1943
S-B10<> October
1943
S-B7<> Nov 1943
S-A3<>
S-A1<> Jan 1944 to Nov 1944
O11A<>
Bolt D28287-17SA
Serial# 3,100,000-3,500,000
B4A
B4C
Bolt D28287-18SA oct 1944 to nov 44
Serial# 3,200,000-3,600,000
B4A
B4C
O11B<> Oct 1944 to Nov 1944
A-4<>
Bolt D28287-19SA july 1944 to oct 1945
Serial# 3,500,000 to end of WW2 production
O-15 Unk
O-14A Jul 1944
O-15
O-16 removed from service bad heat treatment (see below)
O-17 oct 1944 to Dec 1944
B-13
B-14
B-16-B
B-17 Oct 1944 to Dec 1944
B-18
B-19
A-4
A-5 Jan 1945
A-6
A-7 Jan 1945
A-8 Mar 1945
A-9 Jun 1945 to
Oct 1945
A-10
A-14
A-18
D-17
<> indicates 8620 steel
Heat lot codes production (various undocumented sources)
RE-Republic Steel
J-Jones and Laughlin Steel
B-Bethlahem Steel
US-US Steel
A-Armco Steel
C-Carnegie-Illinois Steel Company
S-Sharon Steel 
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