Imperial standard and metric hex nuts for export. DIN, ANSI, GB standards. Matching nuts for bolt grades 8.8, 10.9. Wholesale export pricing.
Imperial Standard Hex Nuts: UNC/UNF for Export
Imperial standard hex nuts for export include UNC (Unified National Coarse) and UNF (Unified National Fine) thread forms in fractional sizes from 1/4" through 1-1/2". Export to markets using American standards (North America, Caribbean, Gulf states) requires nuts conforming to ASME B18.2.2 dimensions. Key sizes in stock: 1/4"-20 UNC, 5/16"-18 UNC, 3/8"-16 UNC, 7/16"-14 UNC, 1/2"-13 UNC, 5/8"-11 UNC, 3/4"-10 UNC, 7/8"-9 UNC, 1"-8 UNC/UNF. Our wholesale export line includes zinc-plated carbon steel, HDG carbon steel, and 304/316 stainless steel. Always match nut grade to bolt grade: Grade A194 2H (for ASTM A193 B7 bolts) is the standard heavy hex nut for high-temperature and pressure-containing applications.
DIN and GB Standard Nuts for International Export
DIN standard nuts (DIN 934 for standard hex nuts, DIN 6925 for flange nuts) are globally recognized and accepted in most export markets. The metric thread pitch must be specified: coarse (default) or fine. For structural bolting per EN 14399, specify heavy hex nuts with the exact proof load class. GB standard stainless steel hex nuts (GB/T 6170 for standard nuts, GB/T 6172 for thin nuts) are harmonized with ISO equivalents and are acceptable in most export destinations. For African export markets, many buyers accept GB or DIN interchangeably. Always verify with the local inspector or engineer if SABS, KEBS, or other local standard certification is required.
Hex Nut and Bolt Grade Matching Chart
| Bolt Grade | Min Nut Grade | Nut Type | Material/Coating |
|---|---|---|---|
| 4.8 (Carbon Steel) | Grade 5 (A563) | Standard Hex | Zinc Plated |
| 8.8 (Carbon Steel) | Grade 8 (A563) | Heavy Hex | Zinc Plated or HDG |
| 10.9 (Carbon Steel) | Grade 10 (A563) | Heavy Hex | HDG (outdoor) |
| 12.9 (Alloy Steel) | Grade 12 (A563) | Heavy Hex | Zinc Plated or Black Oxide |
| A2-70 (304 SS) | A2-70 | Standard Hex | Passivated SS |
| A4-80 (316 SS) | A4-80 | Heavy Hex | Passivated SS |
| A325 Structural | A563 DH | Heavy Hex | HDG (same lot) |
| A490 Structural | A563 DH or A194 8 | Heavy Hex | HDG or Natural |
Frequently Asked Questions
What nut grade matches an 8.8 bolt?
Grade 8 (proof load 890 MPa) is the minimum match for 8.8 bolts. Heavy hex Grade 8 is preferred for structural connections.
Can GB and DIN nuts be used interchangeably?
Yes, GB and DIN metric nuts are harmonized under the ISO agreement and are dimensionally interchangeable. ISO 4032 replaces both DIN 934 and GB/T 6170.
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