On this page 6 sections
Types of nuts
Nuts by material
Stainless Steel Nuts
- SS 304 Nuts
- SS 316 Nuts
- SS 316L Nuts
- SS 321 Nuts
- SS 347 Nuts
- SS 410 Nuts
- SS 904L Nuts
- Duplex 2205 Nuts
- Super Duplex 2507 Nuts
Nickel Alloys Nuts
- Inconel 600 Nuts
- Inconel 625 Nuts
- Inconel 718 Nuts
- Incoloy 800 Nuts
- Incoloy 825 Nuts
- Monel 400 Nuts
- Monel K-500 Nuts
- Hastelloy C22 Nuts
- Hastelloy C276 Nuts
Non-Ferrous Metals Nuts
How they are made
Hot-forged or cold-formed from bar, heat treated (for hardenable grades), tapped and coated if required.
Nuts: how they are made, sized and tested
How it's madeHot-forged or cold-formed from bar, heat treated (for hardenable grades), tapped and coated if required.
- Size range
- M6 – M100 and ¼" – 4"; heavy hex to ASME B18.2.2; metric to ISO 4032 / 4033
- Finish
- Plain, zinc, galvanised (tapped oversize), fluoropolymer
Testing & documents
- Proof-load tests
- Hardness tests
- Chemical analysis
- EN 10204 3.1 certificate; 3.2 with third-party inspection
Marking and packing
Marking: Grade symbol (e.g. 2H, 8M) and manufacturer's mark.
Packing: Cartons or boxes with labels.
Frequently asked questions
Why use heavy hex nuts on flanges?
Heavy hex nuts are thicker and wider across flats than regular hex nuts, which suits the high preloads and larger wrench bearing surfaces needed in pressure bolting.
Which materials are nuts available in?
Stainless Steel, Nickel Alloys, Non-Ferrous Metals: 25 grades in total, from stock or mill-sourced.
What sizes of nuts do you supply?
M6 – M100 and ¼" – 4"; heavy hex to ASME B18.2.2; metric to ISO 4032 / 4033.
How are nuts tested?
Proof-load tests; Hardness tests; Chemical analysis.