Amigo Impex is a Nimonic 80A fastener manufacturer and supplier. We hold AS 9120B for aerospace distribution and ISO 9001:2015 for our manufacturing operations; cutting, machining and threading of UNS N07080 stock are carried out in-house at our Mumbai facility. Every shipment undergoes complete testing and packing before dispatch. We supply fully certified Nimonic 80A fasteners directly from India to global projects.
Nimonic 80A is a precipitation-hardenable nickel-chromium alloy. Chromium sits at 18.0 to 21.0%, while titanium and aluminium additions harden the material on ageing, so a bolted joint keeps its clamp load where stainless or A-286 bolting relaxes. Fasteners in the age-hardened condition retain tensile and creep-rupture strength to 815 °C (1500 °F), with good oxidation and corrosion resistance across that range. This material conforms to ASTM B637 / ASME SB-637, DIN EN 10269 covers elevated-temperature fastener properties, and BS 4882 B80A covers bolting; the same alloy answers drawings marked W.Nr. 2.4952, NCF 80A or GH4080A. Hex bolts, hex nuts, stud bolts, threaded rods, screws and washers are produced from #00 to 4 inches and M1.2 to M48, with rolled or cut threads. Gas turbine assemblies, engine exhaust and turbocharger mountings, furnace hardware and nuclear plant bolting utilise this grade the most.
Amigo Impex provides export packing, in-house testing and quotation in INR/kg or USD/kg. As an ISO 9001:2015 certified manufacturer, stockist and exporter, we certify each consignment against the exact specification named on the purchase order.
Dimensional range, thread forms, supply condition and governing standards for Nimonic 80A Fasteners appear in the table below. Procurement teams can check each parameter against a drawing callout before raising an enquiry.
Four standards cover the finished fastener: ASTM B637 / ASME SB-637 for the material, DIN EN 10269 for elevated-temperature fastener properties, BS 4882 for bolting, and DIN or ISO standards for dimensions.
| Standard | Coverage |
|---|---|
| ASTM B637 / ASME SB-637 | Precipitation-hardened nickel alloy bar and forging stock, grade UNS N07080 |
| DIN EN 10269 | Nickel alloy fasteners with specified elevated-temperature properties |
| BS 4882 B80A | Bolting for flanges and pressure-containing purposes |
| DIN / ISO Dimensional Standards | Dimensional conformance per fastener type |
Titanium at 1.8 to 2.7% and aluminium at 1.0 to 1.8% form the gamma-prime precipitate during ageing, and that precipitate is what holds bolt stress at temperatures where solid-solution alloys let preload decay.
The limits above are per ASTM B637 / ASME SB-637 (UNS N07080). Where EN 10269 grade NiCr20TiAl (2.4952) is called up, tighter limits apply (C 0.04–0.10, Co ≤ 1.00, Fe ≤ 1.50, P ≤ 0.020, Ni ≥ 65) and we order heats to the EN limits when EN 10269 is stated on the purchase order.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 18.0 – 21.0 |
| Titanium (Ti) | 1.8 – 2.7 |
| Aluminium (Al) | 1.0 – 1.8 |
| Cobalt (Co) | 2.0 max |
| Iron (Fe) | 3.0 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Carbon (C) | 0.10 max |
| Copper (Cu) | 0.20 max |
| Sulphur (S) | 0.015 max |
| Boron (B) | 0.008 max |
| Zirconium (Zr) | 0.15 max |
In the solution-treated and age-hardened condition, the standard supply state for Nimonic 80A fastener stock, the properties below hold. Lot-specific tensile figures are certified on the mill test certificate issued with each order.
| Property | Value (Solution Treated + Age Hardened) |
|---|---|
| Tensile Strength | 930 N/mm² min (ASTM B637) · 1000 N/mm² min (BS 4882 B80A) · 1000–1300 N/mm² (EN 10269) |
| 0.2% Proof Stress | 620 N/mm² min (typical 700–780 N/mm²) |
| Elongation (on 5.65√S₀) | 20% min in 2 in. / 4D (ASTM B637, BS 4882 B80A) · 12% min on 5.65√S₀ (EN 10269) |
| Reduction of Area | 12% min (EN 10269, NiCr20TiAl, +AT+P) |
| Hardness | 285–360 HB |
Minimum values follow BS 4882 grade B80A bolting requirements. Lot-specific tensile, proof stress, elongation and hardness figures are certified on the mill test certificate issued with each order. Stress-rupture properties at temperature are available on request.
The drawings specify the regional designation: UNS N07080, W.Nr. 2.4952, NCF 80A and GH4080A all describe one alloy, and Amigo Impex certifies supply against each callout.
| Region / System | Designation |
|---|---|
| USA (ASTM / ASME) | UNS N07080 |
| Europe (EN / W.Nr.) | NiCr20TiAl / W.Nr. 2.4952 (2.4631 also cross-referenced); DIN EN 10269 |
| UK (BS) | BS 4882 B80A (bolting); BS HR 1 / HR 201 / HR 401; BS 3076 NA20 |
| Japan (JIS) | NCF 80A (JIS G 4901 / G 4902) |
| China (GB) | GH4080A (legacy GH80A) |
| Russia (GOST) | KhN77TYuR / EI-437B (approximate equivalent, not a drop-in substitute) |
Amigo Impex manufactures 7 fastener types in Nimonic Alloy 80A. Threaded items are produced in inch or metric thread form to your drawing, and every part is finished in-house before dispatch.
From Mumbai, fasteners lots are shipped in boxes, crates or bundles, with export packing prepared as per the consignment's requirements. Domestic dispatch covers pan-India. Export shipments to the USA, the Gulf, Europe and Asia, and urgent orders leave within 1 to 2 days.
Amigo Impex operates under AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018 certification. As a Nimonic 80A fasteners supplier, In-house testing checks each production lot, and a mill test certificate, drawn from the original mill or our own testing, accompanies every order. Third-party inspection can be arranged at the works on request.
Alloy 80A fastener pricing follows the nickel market at ₹3,000-₹4,500 (US $31-47) per kg, so we quote every enquiry fresh in INR/kg and USD/kg based on current metal rates. Diameter, length, thread production method, head style, order quantity and certification requirement each affect the price, and a made-to-drawing part is priced differently from a standard catalogue item.
Request a custom Nimonic 80A fastener quote today based on your specific dimensions, quantity, or custom drawing.
Request a Quote60–70 tonnes held in Mumbai, with urgent requirements dispatched within one to two days.
AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018, with an MTC on every order.
Cutting, machining, threading, fabrication and testing all handled at our own Mumbai facility.
Original mill certificates plus our own test reports, so every batch can be traced back.
Non-standard sizes and specifications made to order.
Dispatched from Mumbai to every major Indian city, and exported to USA, Gulf, Europe, Asia
UNS N07080 is the American designation for Nimonic 80A fasteners; European drawings write it as NiCr20TiAl / W.Nr. 2.4952, British bolting as BS 4882 B80A, Japanese as NCF 80A and Chinese as GH4080A.
815 °C (1500 °F) is the upper service limit for Nimonic 80A bolts, and fastener operating temperatures in exhaust or turbine joints commonly reach 800 °C.
Age hardening is the default supply condition: each fastener is solution-treated and precipitation-hardened unless the order states otherwise, because that's where the strength margin over Nimonic 75 comes from.
For general service, we roll threads before final ageing, which extends die life. For fatigue-critical aerospace and turbine joints, we roll after heat treatment (RAHT), so the compressive residual stress in the thread root is retained. This is the condition that gives rolled threads their fatigue advantage over cut threads. State the requirement on your drawing and we will quote accordingly.
Material and dimensional certification to ASTM B637 / ASME SB-637, DIN EN 10269 and BS 4882 accompanies each order.
The following industries specify Nimonic 80A fasteners, where bolted joints run hot enough to need strong fasteners.
