Materials · Nickel-chromium superalloys
Inconel fasteners
HAGUE FASTENERS makes Inconel fasteners to order: bolts, studs, nuts, washers and machined components in Inconel 600, 601, 625, 718, 725 and X750, made in Willenhall from certified, traceable bar, from a single part to several hundred.
6 grades
From 600 and 625 to 718, 725 and X750
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 Inconel
Strength and corrosion resistance in extreme environments
Inconel is a family of nickel-chromium superalloys chosen for corrosion resistance and strength in extreme environments, from subsea oil and gas equipment to power generation plant. Inconel fasteners keep their strength at temperatures that would soften alloy steels, and resist oxidation, pitting and crevice corrosion.
Machining nickel alloys well needs the right tooling and experience. HAGUE FASTENERS has turned and threaded Inconel for decades, and holds stocks of superalloy bar so many orders can start straight away.
Grades
Inconel grades we machine
Select a grade for its composition, properties and equivalent designations. The grade supplied always follows your specification.
Inconel 600
Oxidation and corrosion resistance across a wide temperature range; non-magnetic and readily weldable.
Inconel 601
Aluminium addition for resistance to oxidation at high temperature, for furnaces and heat-treating equipment.
Inconel 625
Seawater and subsea service; resistance to pitting and crevice corrosion.
Inconel 718
High strength and resistance to relaxation at high temperature; NACE-limited hardness for oil and gas.
Inconel 725
Age hardened for high strength with the corrosion resistance of 625, for marine fasteners.
Inconel X750
Precipitation hardenable for strength and low creep at elevated temperature.
Choosing a grade
Matching the grade to the duty
These are typical selections only. The grade supplied always follows your specification, and we are happy to advise on alternatives such as Incoloy, Hastelloy, Monel or super duplex.
| Service environment | Grades usually considered |
|---|---|
| Seawater and subsea | 625, 725 |
| High strength at high temperature, gas turbines | 718, X750 |
| Oil and gas wellheads and valves | 718, 725 |
| Furnaces and heat-treating equipment | 601, 600 |
| Chemical and food processing | 600, 625 |
| Nuclear plant | 718, X750, 600 |
What we make
Inconel fasteners we make
Threads can be metric coarse or fine, UNC, UNF, UN, BSW, BSF or a special form to your drawing, cut or rolled.
Fasteners and components
- Studbolts, engineer studs and waisted studs
- Hexagon, 12-point and special head bolts
- Nuts and washers
- Socket screws in non-standard sizes
- Turned and milled components to drawing
Where they are used
- Oil and gas wellheads, subsea and topside equipment
- Power generation turbines and plant
- Chemical processing
- Nuclear applications
- Marine and offshore hardware
Proving the material
Proven from mill to final release
Machining nickel alloys well needs the right tooling and experience; proving them needs paperwork you can trust. Mill certificates and heat numbers are carried through to release, PMI and chemical analysis are available, and heat treatment such as solution annealing and precipitation hardening is carried out by approved partners with furnace charts on request. Independent UKAS-accredited testing and EN 10204 3.1 or 3.2 certificates are supplied as your order requires.
- Mill certificates and heat traceability
- PMI and chemical analysis
- Solution annealing and precipitation hardening, with furnace charts
- Hardness testing to NACE limits where specified
- Laser-marked heat codes or part numbers
Questions
Frequently asked questions
Can you supply Inconel 718 bolts to a specification?
Yes. Tell us the specification, condition and test requirements and we will make and certify the parts to suit.
Which Inconel grade is best for seawater?
Inconel 625 is the usual choice for seawater and subsea Inconel fasteners because of its resistance to pitting and crevice corrosion. Inconel 725 is used where higher strength is also needed.
Do you hold Inconel bar in stock?
Yes. We hold considerable stocks of superalloy bar from UK, EU and US mills, so many orders can start straight away.
Is Inconel the same as Incoloy?
No. Both are nickel alloys, but Incoloy grades such as 800 and 825 contain more iron and are chosen for different duties. We make fasteners in both.
Can you make Inconel fasteners in small quantities?
Yes. We make Inconel 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.
Inconel 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 with a quotation.