TM 1-1500-204-23-6
Table 2-1. Bolt and Screw Markings - CONT
Classification or
Marking
Material
Physical characteristics
specification
Steel, alloy, medium
TS: 125,000 psi min
MIL-B-6812 includes-
carbon (Cr, Ni, Mo)
RH: C26-32
MlL-S-5626 for No 4140
MIL-S-6049 for No. 8740
MIL-S-6050 for No. 8630
MlL-S-6098 for No. 8735
MIL-S-6758 for No. 4130
MIL-S-6050 for No. 4037
AMS 6300
Steel, alloy, medium
TS: 125,000 psi min
MIL-S-7839 includes.
carbon (Cr, Ni, Mo)
RH- C26-32
MIL-S-6049 for No. 8740
MIL-S-6050 for No. 8630
MIL-S-6098 for No. 8735
MIL-S - 6050/AMS 6030
MIL-S-6758 for No. 4130
(4037) not to be
MlL-S-6050 for No. 4037
used over 1/2 inch dia
AMS 6300
Steel, 5 percent
TS: 100,000 psi min up to 4
AISI 501, grade B
Chromium
inch dia inclusive
ASTM A193
TS: 95,000 psi min over 2-1/2
ASTM A193
inch and up to 4-inch dia
inclusive
Steel, 12 percent
TS: 125,000 psi min 1/4 inch
AISI 416, grade B6
chromium
and over dia for
MIL-S-1 222
H condition
RH: C25-34
TS: 180,000 psi min 1/4 inch
and over dia for
HT condition
RH: C38-47
2-6
