TM 1-1500-204-23-6
Table 2-1. Bolt and Screw Markings - CONT
Classification or
Marking
Material
Physical characteristics
specification
TS: 140,000 psi min
over 2-1/2 inch dia
RH. C30-38
Reason: Updating per ANSI B18 2 1 Appendix 111
Alloy Steel,
TS: 155,000 psi min
ASTM-A354,
Quenched and
1/4 to 2-1/2 inch
Grade BD
Tempered
dia inclusive
RH: C33-39
TS: 145,000 psi min
over 2-1/2 to 4 inch
dla inclusive
RH: C31-39
Reason Updating per ANSI B18 2.1 Appendix 111
Low Carbon
TS: 150,000 psi min
SAE J429,
Martensite
1/4 thru 1 inch dia
Grade 8 2
Steel, Quenched
RH: C33-39
and Tempered
Alloy Steel,
TS: 150,000 psi min
ASTM-A490,
Quenched and
1/2 to 1-1/2 inch dia
Type 1
Tempered
inclusive
RH: C33-38
Atmospheric
TS: 150,000 psi min
ASTM-A490
Corrosion
1/2 to 1-1/2 inch
Type 3
(Weathering)
dia inclusive
Steel, Quenched
C33-38
Steel, alloy, medium
RH: C26-32
AMS 6320
carbon
Steel, alloy, medium
RH: C26-32 (For hexagon head
AMS 6322
carbon
bolts)
RH: C32-36 (For socket head
bolts)
Steel, alloy, medium
RH: C26-32
AMS 6322
carbon
Steel, alloy, medium
RH: C32-36
MS 6322
medium carbon
2-5
