Heavy hex nuts
Heavy hex nuts to ASTM A194, thicker and wider across flats than a standard hex nut so the thread engagement carries the full bolt load. We supply them matched to the stud, with the pairing stated on the certificate.
M12 – M64 · ½" – 2½"
Heavy hex nuts
How we make it
- Height and width across flats to ASME B18.2.2 heavy series
- Grade marking stamped on the face — 2H, 2HM, 7, 7M, 8, 8M
- Overtapped where the studs are hot dip galvanized, per ASTM A563
- Hardness recorded per batch — and per piece on the M grades
Available grades
2H-48 … 427 °C
ASTM A194 Grade 2H
Medium carbon steel
—MPa min
2HM-48 … 427 °C
ASTM A194 Grade 2HM
Medium carbon steel
—MPa min
Gr 4-101 … 538 °C
ASTM A194 Grade 4
Carbon-molybdenum steel
—MPa min
Gr 7-101 … 538 °C
ASTM A194 Grade 7
Chromium-molybdenum alloy steel (AISI 4140)
—MPa min
Gr 7M-101 … 427 °C
ASTM A194 Grade 7M
Chromium-molybdenum alloy steel (AISI 4140)
—MPa min
Gr 8-254 … 816 °C
ASTM A194 Grade 8
Austenitic stainless steel, AISI 304
—MPa min
Gr 8M-254 … 816 °C
ASTM A194 Grade 8M
Austenitic stainless steel, AISI 316
—MPa min
Need a quotation?
Send us the grade, size and quantity. We reply within one working day with price, lead time and the certificate package included.