TM 1-1500-204-23-6
Table 2-1. Bolt and Screw Markings - CONT
Classification or
Marking
Material
Physical characteristics
specification
Steel, corrosion-
Cold Drawn
resistant (18Cr, 8NI,
TS: 125,000 psi min up to
AISI 303, grade B8F
free machining)
3/4-inch dia inclusive
ASTM A320
TS: 115,000 psi min over
3/4-inch and up to
1-inch dia inclusive
TS: 105,000 psi min over
1-inch and up to 1-1/4
inch dia inclusive
TS: 100,000 psi min over
1-1/4 inch and up to
1-1/2 inch dia inclusive
Steel, corrosion- and
TS: 130,000 psi min
AMS 5731
heat-resistant (15Cr,
BH- 248 to 341
A286
26Ni,1 3Mo,1 9T1,
0 3V)
Steel, corrosion- and
TS: 130,000 psi min up
MIL-B-7874, 1200°F
heat-resistant
to 1-1/4 inch inclusive
RH C27-37
Steel, chromium
TS: 125,000 psi mmn up to
AISI 4140, 4142, 4145
molybdenum
2-1/2 inch dia inclusive
grade L7 ASTM A320
TS: 105,000 psi min over
2-1/2 inch and up to
4-inch dia inclusive
TS: 125,000 psi min
MIL-S-1222
1/4 to 2-1/2 inch dia
RH C25-34
TS: 115,000 psi min
over 2-1/2 inch dia
RH C22-34
2-13
