Products · Nuts
Special flange nuts
Hexagon and 12-point flange nuts with an integral bearing face, made by HAGUE FASTENERS in high temperature grades, super duplex and critical stainless steels.
1971
Making special nuts for over half a century
1 to 500
Single prototypes to batches of several hundred
A194
Petrochemical grades, plus classes to 12
UK, EU, US
Mill origin of every bar we use
Nuts
Larger diameter flange nuts are our niche
HAGUE FASTENERS makes flange nuts in the UK, with larger diameters as our niche. The integral flange spreads the clamp load over a wider area, so a separate washer is often not needed and the joint has fewer loose parts.
Our work shines in the high temperature grades, super duplex and critical stainless steels, where mass-produced flange nuts are not available.
Where they are used
- Turbines, exhausts and hot gas paths
- Offshore and subsea assemblies
- Engines and compressors
- Slotted and oversized holes
- Assemblies where washers are hard to fit
Typical specifications
Options we make to
The standards listed are those we are most often asked to make to or modify. The part supplied always follows your drawing or specification.
| Option | Typical choices |
|---|---|
| Forms | Hexagon or 12-point, plain or serrated flange, large diameter, special flange sizes |
| Standards | DIN 6923, ASME B18.2.2, customer and OEM drawings |
| Grades | High temperature alloys, super duplex, A4 stainless, nickel alloys, alloy steels |
| Threads | Metric coarse and fine, UNC, UNF, UN, BSW, BSF and special forms |
| Finishes | Plain, passivated, zinc flake, zinc nickel, electroless nickel, PTFE and others via coatings |
| Documentation | CoC, EN 10204 3.1 and 3.2, test reports, laser-marked heat codes |
Materials
Any grade, made in the UK
See all fastener materials. Grades are selected for corrosion, temperature and strength, and we are happy to advise.
Typical materials
- Carbon and alloy steels: mild steel, EN16, EN24, ASTM A194 2H, 4 and 7
- Stainless steels: A2, A4, 316, ASTM A194 8 and 8M, 17-4PH
- Duplex and super duplex: S31803, S32750, S32760
- Inconel, Incoloy and Monel
- Hastelloy and titanium
- Bronzes, brass and copper alloys
Why buyers come to us
- Made in our Willenhall facility, from one-offs to several hundred
- Bar from UK, EU and US mills only, with heat traceability
- Modified standards and parts to customer or OEM drawings
- EN 10204 3.1 or 3.2 certificates and UKAS-accredited testing
- Copies made from a sample or photograph, with upgrades if needed
Related products
Related types
For 12-point flange nuts see also BiHex nuts.
All nut types
Back to the nuts family
Custom fasteners
Made to your drawing
Questions
Frequently asked questions
What are flange nuts used for?
Flange nuts are used where the clamp load needs spreading over a larger area without a separate washer, for example on slotted holes or softer materials.
Serrated or plain flange?
A serrated flange bites into the surface to resist loosening; a plain flange avoids marking the joint face and suits coated or finished surfaces. We make both.
Can you make large diameter flange nuts?
Yes. Larger diameter flange nuts in special materials are a particular strength of ours. Send your drawing or size.
Is there a minimum order quantity?
No. We make single prototypes and urgent breakdown replacements as well as batches of several hundred.
Flange nut enquiry?
Send us your drawing or specification
Tell us the size, thread, grade, quantity and documentation you need and we will come back to you quickly.