Heavy Hex Nuts

Heavy hex nuts are slightly larger and thicker than finished hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

STANDARD - ASTM A194
Grade Thread Series Diameter Material
2H UNC 1/4 TO 2 1/2" CARBON
2H UNF 1/2 TO 2 1/2" CARBON
2H 8UN 1 1/8 TO 4" CARBON
2H METRIC M M12 TO M24" CARBON
2H METRIC 8UN 1 1/8 TO 1 1/2" CARBON
2H SLOTTED UNC 1/2 TO 1 1/2" CARBON
2H SLOTTED 8UN 1 1/8 TO 2 1/2" CARBON
2HM UNC 3/8 TO 1" CARBON
2HM 8UN 1 1/8 TO 4" CARBON
3 UNC 3/8 TO 1" 501
3 8UN 1 1/8 TO 2" 501
4 UNC 1/2 TO 1" CARB. MOLY.
4 8UN 1 1/8 TO 2 3/4" CARB. MOLY.
6 UNC 3/8 TO 1" 410
6 8UN 1 1/8 TO 2 3/4" 410
6F UNC 1/2 TO 1" 416
7 UNC 3/8 TO 2" 4140-4145
7 8UN 1 1/8 TO 3 01/2" 4140-4145
7M UNC 1/2 TO 1" 4140-4145
7M 8UN 1 1/8 TO 4" 4140-4145
8 UNC 1/4 TO 1 3/4" 304
8 8UN 1 1/8 TO 2 3/4" 304
8 METRIC M m12 TO M24 304
8 METRIC 8UN 1 1/8 TO 1 1/2" 304
8A UNC 1/4 TO 1" 304
8A 8UN 1 1/8 TO 2 1/2" 304
8 STRAIN HARDENED UNC 3/8 TO 1" 304
8 STRAIN HARDENED 8UN 1 1/8 TO 1 1/4" 304
8C UNC 1/2 TO 1" 347
8C 8UN 1 1/8 TO 2" 347
8F UNC 1/4 TO 1 1/4" 303
8F 8UN 1 1/8 TO 1 1/2" 303
8M UNC 1/4 TO 1 3/4" 316
8M 8UN 1 1/8 TO 2 1/2" 316
8M METRIC M M12 TO M24" 316
8M METRIC 8UN 1 1/8 TO 1 5/8" 316
8MA UNC 1/4 TO 1" 316
8MA 8UN 1 1/8 TO 2 1/2" 316
8M STRAIN HARDENED UNC 3/8 TO 1" 316
8T UNC 3/8 TO 1" 321
8T 8UN 1 1/8 TO 1 1/2" 321
STANDARD - ASTM A453
Grade Thread Series Diameter Material
660B NR UNC 1/2 TO 1" A286
660B NR 8UN 1 1/8 TO 2" A286
660D UNC 1/2 TO 1" A286
660D 8UN 1 1/8 TO 2" A286