Nimonic is a family of nickel-chromium superalloys originally developed for the Whittle jet engines of the 1940s and still the reference materials for high-temperature bolting and hot-section hardware. The range covers three approaches to strength. Alloys 75, 86 and 230 are solid-solution strengthened, offering the ductility, formability and weldability that fabricated assemblies need. Alloys 80A, 81, 90, 105 and 115 are gamma prime age hardened, trading fabricability for progressively higher creep strength — from 815°C in alloy 80A to about 1010°C in alloy 115. Alloys C263, PK33, PE11, PE16 and 901 deliberately restrict their aluminium and titanium content to keep welded joints ductile. Exotic Alloy manufactures the full Nimonic range of bolts, stud bolts, heavy hex nuts and custom CNC fasteners with traceability to BS HR, AMS, DIN and customer specifications.
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Machining difficulty across the Nimonic range tracks gamma prime content almost exactly. Alloy 75 cuts like a tough austenitic; alloy 115, with combined aluminium plus titanium approaching 10%, needs ceramic tooling, very low surface speeds and often grinding to finish. Exotic Alloy machines the age-hardenable grades in the solution-treated condition and rolls threads before the ageing cycle wherever the design allows, which produces a cold-worked, grain-flow-continuous thread with far better fatigue performance than a thread cut into aged material.
A quick reference for the most common Nimonic alloys across global standards.
| Alloy Grade | UNS Designation | Werkstoff / DIN | Standards (Fasteners / Bars) |
|---|---|---|---|
| Nimonic 75 | N06075 | 2.4951 / 2.4630 | BS HR 203 / BS 3076 NA20 |
| Nimonic 80A | N07080 | 2.4952 / 2.4631 | BS HR 1, 201, 401, 601 / DIN 17742 |
| Nimonic 81 | – | – | Customer specification |
| Nimonic 86 | – | – | Customer specification |
| Nimonic 90 | N07090 | 2.4632 | BS HR 2, 202, 402, 502 / DIN 17742 |
| Nimonic 105 | – | 2.4634 | BS HR 3 |
| Nimonic 115 | – | 2.4636 | Customer specification |
| Alloy 230 | N06230 | 2.4733 | ASTM B572 / B435 / B564 |
| Nimonic C263 | N07263 | 2.4650 | AMS 5872 / AMS 5886 |
| Nimonic 901 | N09901 | 2.4662 | AMS 5660 / AMS 5661 / DIN 17742 |
| Nimonic PE11 | – | – | Customer specification |
| Nimonic PE16 | – | – | Customer specification |
| Nimonic PK33 | – | – | Customer specification |
We are committed to delivering zero-defect Nimonic fasteners. All products undergo rigorous testing including PMI (Positive Material Identification), hardness verification after age hardening, dimensional inspection, and material traceability with EN 10204 3.1 certification.
Exotic Alloy exports Nimonic fasteners to aerospace, power generation, gas turbine and industrial furnace clients worldwide. Our dedicated logistics team ensures secure export packaging and timely deliveries by sea and air freight with full customs documentation support.