We don’t buy the bar.
We melt it.
High temperature fasteners and superalloy bolting for 815°C service, engineered from the furnace lot up, with a mill test certificate tied to every single head marking.
- 815°C
- Peak service
- M6-M100
- Size range
- 30+
- Melted grades
- 10+
- Countries
Configure the bolt, not the email thread.
Specify your nickel alloy bolts by service temperature and environment, choose the geometry and thread size, and the qualifying alloys plus a live dimensioned drawing update instantly. Send the exact spec to our engineers in one click.
Step 2 · Geometry
Start from a typical application
4 of 6 grades qualify
Hex Bolt · M24 × 120 mm · Inconel 718 (UNS N07718) · service 650°C · Hot air / flue gas
Working from a drawing? We also produce non-standard heads, custom pitches, coatings and silver anti-galling treatments, with trial runs from 50 pieces.
Six controlled steps, zero outsourcing.
- 01VIM Vacuum Melting1500-1600°C, <5 ppm O₂
- 02ESR / VAR RefiningInclusion-free ingot
- 03Hot ForgingContinuous grain flow
- 04Solution + Agingγ″ precipitation control
- 05CNC Machining±0.01 mm
- 06PMI · UT · MTC100% verified
Every bolt traces back to its heat of steel.
100% PMI
Spectrometer-verified chemistry, no mixed lots
±0.01 mm
CMM and thread ring gauge inspection
EN 10204 3.2
Third-party witness on request
UT / MPI
Non-destructive testing on critical batches
Where high temperature bolts make the difference.
Aerospace fasteners for turbine engines, gas turbine bolting for power generation, sour-service hardware for oil and gas, and bolting for the chemical, marine and motorsport sectors.
Aerospace
Aerospace fasteners for jet engines, exhaust systems, and airframe hot-section assemblies, supplied with EN 10204 3.1 or 3.2 certificates.
Power Generation
Gas turbine bolts and studs for land-based turbines, HRSG, and combined-cycle plants operating to 815°C.
Oil & Gas
Sour-service and high-pressure bolting for wellheads, Christmas trees, subsea manifolds per NACE MR0175.
Chemical Processing
Corrosion-resistant fasteners for reactors, heat exchangers, FGD scrubbers in acid and chloride environments.
Marine & Offshore
Seawater-resistant bolting for riser flanges, propeller shafts, pumps, and naval exhaust systems.
Automotive & Motorsport
Turbocharger studs, exhaust manifold bolts, and high-temperature engine fasteners for racing and OEM.
Every step from melt to finished thread runs in one factory.
Most superalloy fasteners on the market are machined from bars bought from third-party mills. This factory owns every step: vacuum induction melting, ESR/VAR refining, forging, heat treatment, and CNC machining.
Superalloy fasteners: how we compare
| Capability | Us | Typical Distributor |
|---|---|---|
| In-house melt | Yes | No |
| Custom chemistry | Yes | Rare |
| Traceability | Heat-level | Lot-level |
| 6-step process | Owned end-to-end | Fragmented |
| Small batch (50 pcs) | Yes | Often refused |
| EN 10204 3.2 | Standard | On request |
High temperature bolts: what engineers ask before they spec.
What temperatures can superalloy fasteners withstand?
Our superalloy fasteners cover continuous service from 300°C to 815°C depending on alloy grade. Nimonic 80A retains strength to 815°C, Inconel 718 to 700°C, A-286 to 650°C, and Hastelloy C-276 to 425°C. For temperatures above 815°C, we offer custom nickel alloy bolts in refractory grades.
Which nickel alloy bolts work in sour gas (H₂S) environments?
For sour gas service, nickel alloy bolts in Inconel 718, Inconel 625, and Hastelloy C-276 meet NACE MR0175/ISO 15156 requirements. Inconel 718 is the most popular choice for high temperature bolts in sour wells due to its combination of strength and H₂S resistance up to 700°C.
Can you manufacture custom high temp bolts to our drawing?
Yes. We produce custom high temp bolts in non-standard head styles, thread pitches, lengths, and coatings, from 50-piece trial runs to full production volumes. Our in-house melt shop means we can also tailor the alloy chemistry to your exact service conditions.
What certifications do your aerospace fasteners carry?
Our aerospace fasteners are supplied with full material certification to AMS, ASTM, and EN 10204 3.1 / 3.2. We support NADCAP-accredited processes and can arrange third-party witness testing (Lloyd's, Bureau Veritas, TÜV) on request. Every heat is PMI-verified.
How do gas turbine bolts differ from standard fasteners?
Gas turbine bolts must maintain clamping force through thermal cycling from ambient to 700°C+, resist oxidation and creep, and survive thousands of start-stop cycles without relaxation. We use controlled grain-flow forging, solution-and-aging heat treatment, and γ″ precipitation control to deliver this performance in Inconel 718 and Nimonic 80A.
What is the lead time for superalloy fastener orders?
Standard grades (Inconel 718, A-286) in common sizes ship within 2-3 weeks from our ex-stock program. Custom high temp bolts requiring a dedicated melt typically ship in 6-8 weeks. We also offer an expedited service for breakdown and outage situations, so contact our engineering team for availability.
Need custom high temp bolts? Let's talk.
Get a technical quote for your custom high temp bolts within 24 hours. Our engineers speak your language, so send us your drawing and we'll spec the alloy.