Products · Nuts
Special square nuts
Square nuts in regular, thin and heavy patterns, made by HAGUE FASTENERS in any grade and thread, including the older British forms.
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
A simple shape that stays put
HAGUE FASTENERS makes square nuts in the UK in grades and sizes nobody stocks. The flat sides sit against a channel or shoulder and will not turn, so the nut can be tightened from one side only, and the larger bearing area suits softer materials.
Many of the square nuts we make are in duplex, super duplex and superalloys. We make less common threads such as BSW, BSF, UNC and UNF, and modified standards or parts made to customer and OEM drawings.
Where they are used
- Channel, slot and T-slot fixings
- Heritage machinery and restoration
- Timber and structural connections
- Electrical and switchgear assemblies
- Square head bolt sets
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 | Regular, thin and heavy square, chamfered, special sizes |
| Standards | DIN 557, DIN 562, ASME B18.2.2 |
| Grades | Steel property classes, A2 and A4 stainless, duplex, nickel alloys, bronzes |
| 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
All nut types
Back to the nuts family
Custom fasteners
Made to your drawing
Questions
Frequently asked questions
Why use square nuts instead of hex nuts?
Square nuts resist turning in a slot or against a shoulder, so they can be tightened from one side. They also have a larger bearing area.
Can you make square nuts to match square head bolts?
Yes. We make matching square head bolts and square nuts, including older British thread forms.
Can you make square nuts in stainless or duplex?
Yes. Stainless, duplex and nickel alloy square nuts are made from certified, traceable bar.
Is there a minimum order quantity?
No. We make single prototypes and urgent breakdown replacements as well as batches of several hundred.
Square 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.