Heavy Hex Nut:
ASTM A194/194M Grade 2H/2HM/8/8M
ASTM A563/A563M Grade A/C/DH/10S
Hex Nut:
SAE J995 Grade 2/5/8
DIN 934 Class 4/6/8/10
ISO4032/4033 Class 4/6/8/10
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