Imperial & Metric | Fastener Charts (2024)

Imperial Grades

IBF/IN2 (PSI)

Metric Classes

MPA (N/MM2)

L9 -- 180,000 PSI -- HIGH TENSILE CLASS 12.9 -- 1,200 MPA -- HIGH TENSILE SAE GRADE 8 -- 150,000 PSI -- HIGH TENSILE CLASS 10.9 -- 1,034 MPA-- HIGH TENSILE SAE GRADE 5 -- 120,000 PSI -- HIGH TENSILE CLASS 8.8 -- 827 MPA-- HIGH TENSILE STAINLESS CLASS 80 (304--316) -- 116,000 PSI STAINLESS CLASS 80 (304-316) -- 800 MPA STAINLESS CLASS 70 (304-316) 101,000 PSI STAINLESS CLASS 70 (304-316) -- 700 MPA
CLASS 5.8 -- 520 MPA STAINLESS CLASS 50 (NO MARKINGS) -- 72,000 PSI STAINLESS CLASS 50 (NO MARKINGS) -- 500 MPA LOW CARBON -- 62,000 PSI 427 MPA 58,015 PSI CLASS 4.6 - 400 MPA