Materials · Nickel-copper alloys
Monel fasteners
HAGUE FASTENERS makes Monel fasteners to order in the UK: bolts, studs, nuts and machined parts in Monel 400, K500 and R405, from certified, traceable bar, for seawater, marine, chemical and oil and gas service.
3 grades
Monel 400, K500 and R405
1 to 500
Single prototypes to batches of several hundred
3.1 / 3.2
EN 10204 certificates with full traceability
UK, EU, US
Mill origin of every bar we use
Why Monel
Nickel-copper alloys made for the sea
Monel is a family of nickel-copper alloys with good strength and excellent corrosion resistance in seawater, brackish water, hydrofluoric and sulphuric acids, and alkalis. Monel fasteners are a long-established choice for marine engineering, offshore equipment, pumps, valves and chemical plant.
Monel 400 is the general-purpose grade. Monel K500 adds aluminium and titanium so it can be age hardened for much higher strength, and Monel R405 is a free-machining version of 400. HAGUE FASTENERS machines all three in Willenhall.
Grades
Monel grades we machine
Select a grade for its composition, properties and equivalent designations. The grade supplied always follows your specification.
Monel 400
General-purpose nickel-copper alloy (NA13, N04400) for seawater, acids and alkalis.
Monel K500
Age-hardenable for high strength, with corrosion fatigue and erosion resistance in fast-flowing seawater.
Monel R405
Free-machining nickel-copper alloy resistant to seawater, steam, salt and caustic solutions.
Choosing a grade
Matching the grade to the duty
Typical selections only. For chloride-rich process streams or higher temperatures, consider super duplex, Inconel 625 or Hastelloy.
| Service environment | Grades usually considered |
|---|---|
| Seawater and marine hardware | 400, K500 |
| High strength in seawater: pump shafts, subsea bolting | K500 |
| Hydrofluoric and sulphuric acids, alkalis | 400 |
| Valves, fittings and machined parts in volume | R405 |
| Oil and gas production instrumentation | K500 |
| Steam and salt solutions | R405, 400 |
What we make
Monel fasteners and components
Studs and studbolts
Stud bolts, engineer studs, waisted studs and tie bars
Bolts and screws
Hexagon, 12-point, fitted and special head bolts
Nuts
Hex, heavy hex, jam, flange and special nuts
Washers
Plain, machined, spherical and tab washers
Socket screws
Non-standard cap, set, shoulder and countersunk screws
Turned and milled parts
Plugs, pins, bushes and components to drawing
Proving the material
Certified from mill to final release
Every bar comes from an approved UK, EU or US mill with its certificate, and the heat number is carried through to release. For K500, age hardening is carried out by approved partners with furnace charts on request. PMI and chemical analysis confirm the grade where specified, and independent UKAS-accredited testing and EN 10204 3.1 or 3.2 certificates are supplied as your order requires. See quality and testing.
- Mill certificates and heat traceability
- PMI and chemical analysis
- Age hardening of K500, with furnace charts
- Tensile and hardness testing
- Laser-marked heat codes or part numbers
Questions
Frequently asked questions
What is the difference between Monel 400 and K500?
Monel K500 is an age-hardenable version of Monel 400. It has similar corrosion resistance but much higher strength, so it is chosen for highly loaded bolting and shafts.
Are Monel fasteners good for seawater?
Yes. Monel fasteners have excellent resistance to seawater and brackish water, including fast-flowing water, which is why they are widely used in marine and offshore equipment.
What is Monel R405?
Monel R405 is a free-machining grade of Monel 400. A controlled sulphur addition makes it easier to machine, so it suits parts with a lot of machining.
Is Monel magnetic?
Monel 400 and R405 are slightly magnetic at room temperature. Where a fully non-magnetic fastener is needed, tell us and we will suggest a suitable grade.
Can you make Monel bolts in small quantities?
Yes. We make Monel parts from a single prototype or breakdown replacement to batches of several hundred.
Useful tools
Free engineering tools
- Material equivalents finder: find the EN, UNS, ASTM, BS and JIS equivalents of a grade, such as 1.4462 or 316.
- Bolt torque calculator: tightening torque and preload for metric, UNC, UNF, BSW and BSF threads.
- Galvanic corrosion checker: check the corrosion risk when joining dissimilar metals.
- Bar weight calculator: weight of round, square and hexagon bar and plate per metre and per piece.
Free to use, no sign-up. See all our engineering tools.
Monel enquiry?
Send us your drawing or specification
Tell us the grade, sizes, quantity and documentation you need and we will come back to you quickly.