One notch mark on the head = grade 2 bolts
3 notches = grade 5 bolts
6 notches = grade 8 bolts
One triangle = Infasco brand, one of the largest bolt mfg in Canada grade 2
Grade 8 bolts are only really needed in hi - strength applications such as bolting a trailer hitch to your truck or building structural steel.
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3RD Echelon Wksp
1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1943 Converto Airborne Trailer
1983 M1009 CUCV
1957 Triumph TRW 500cc
RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......
OMVA, MVPA, G503, Steel Soldiers
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