TM 1-1500-204-23-6
Table 2-1. Bolt and Screw Markings
Classification or
Marking
Material
Physical characteristics
specification
1
Low or Medium
TS: 60,000 psi min
Carbon Steel
1/4 thru 1 1/2 inch
RH: B70-100
2
Low Carbon Steel
TS 60,000 psi min
ASTM-A307
1/4thru 4 dia
RH: B69-B100
3
Low or Medium
TS: 74,000 psi min
SAE J429
Carbon Steel
1/4 thru 3/4 inch dia
Grade 2
RH: B80-100
TS: 60,000 psi min
over 3/4 thru 1-1/2
inch dia
RH: B70-700
4
3 Radial
Medium Carbon
TS: 120,000 psi min
SAE J429,
dashes, lines
Steel,
1/4 thru 1 inch dia
Grade 5
120°
apart
Quenched and
RH: C25-34
or
Tempered
ASTM-A499
TS: 105,000 psi min over 1
Type 1
thru 1-1/2 inch dia
RH: C19-30
5
3 Radial lines
Carbon and Alloy
TS: 120,000 psi min
MIL-S-1222,
1200 apart
Steel,
1/4 thru 1 inch dia
Grade 5
Hardened and
RH: C23-34
Tempered
TS: 105,000 psi min over 1
thru 1-1/2 inch dia
RB: B97-C34
TS: 90,000 psi min over
1-1/2 inch dia
RH. B90 min
6
Low Carbon Martensite TS: 120,000 psi min
SAE J429,
Steel, Quenched and
1/4 thru 1 inch dia
Grade 5 2
Tempered
RH: C26-36
Reason: Updating per ANSI B18.2.1 Appendix 111
7
3 Radial lines
Medium Carbon Steel,
TS: 120,000 psi min
ASTM-A325,
optional
Quenched and
1/2 to 1 inch dia
Type 1
120°
apart
Tempered
inclusive
RH: C24-35
2-3
