Industrial Fastener · Nuts Series
Heavy Hex Nut
Heavy hex nuts have thicker bodies and larger across-flats than standard hex nuts of the same nominal size. ASTM A194 Grade 2H is the workhorse heavy hex nut for high-temperature, high-pressure flange bolting — almost always paired with A193 B7 stud bolts.
Product Overview
Heavy Hex Nut sourcing essentials
Heavy hex nuts have thicker bodies and larger across-flats than standard hex nuts of the same nominal size. ASTM A194 Grade 2H is the workhorse heavy hex nut for high-temperature, high-pressure flange bolting — almost always paired with A193 B7 stud bolts.
ASME B18.2.2 heavy series, ASTM A194 (Grades 2H, 2HM, 4, 7, 8)
Material per requirement
Heavy hex nuts have thicker bodies and larger across-flats than standard hex nuts of the same nominal size. ASTM A194 Grade 2H is the workhorse...
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standards | ASME B18.2.2 heavy series, ASTM A194 (Grades 2H, 2HM, 4, 7, 8) |
|---|---|
| Diameter Range | 1/4" – 4" |
| Common Pairing | A193 B7 studs for flange bolting |
| Surface Finish | Plain, HDG, Zinc plated |
| Documentation | Mill Test Certificate per heat lot |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
What does the '2H' designation mean?
A194 Grade 2H is a quenched and tempered medium-carbon steel heavy hex nut suitable for use with high-tensile bolting at moderate temperatures. The 'H' indicates a hardness range of 24-38 HRC. For higher temperatures or special service, other A194 grades (4, 7, 8M) may be specified.
Ready to quote Heavy Hex Nut?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.