Heavy hex nuts

ASTM A194 Grade 7 — chemistry & properties

ASTM A194 Grade 7 (Heavy hex nuts, UNS G41400): chemical composition and mechanical properties. Nuts for B16 and L7 bolting in high-temperature and low-temperature service

Chemical composition (wt %)

C	0.37 – 0.49
Mn	0.65 – 1.1
P	≤ 0.035
S	≤ 0.04
Si	0.15 – 0.35
Cr	0.75 – 1.2
Mo	0.15 – 0.25

Mechanical properties

Hardness

248–327 HBW (24–35 HRC)