Amigo Impex manufactures and supplies Inconel fasteners and nickel-alloy bolting from Mumbai, India. Cutting, machining, threading, testing and packing are carried out in-house, so bolts, nuts and washers for a joint can be supplied as one coordinated lot.
Inconel fasteners are nickel-chromium alloy components designed for applications involving elevated temperatures and corrosive environments. High nickel content helps maintain performance at elevated temperatures and gives freedom from chloride-ion stress-corrosion cracking, chromium provides resistance to oxidation and general corrosion, and molybdenum, where present, provides resistance to pitting and crevice corrosion in chloride-containing environments. The range includes Inconel 600, 601, 625, 660A and 718. Inconel 625 bolts, screws and studs within the applicable size range are supplied to ASTM F468 (inch) or ASTM F468M (metric), with matching nuts to ASTM F467 or F467M. Grades 600, 601, 718 and Alloy 660 are not listed in ASTM F468 or F467; bolts, hex cap screws and studs in these grades are supplied to ASTM F2281, with Grade 718 also available to ASTM A1014 / A1014M and Alloy 660 to ASTM A453 / A453M Grade 660, and matching nuts machined from the applicable bar stock to ASME B18.2.2 dimensions. Sizes outside the scope of these specifications are supplied to the corresponding bar-stock specification and to the customer drawing.
Available diameters range from M3 to M56 and 3/16 to 2 inches. Bolts, hex cap screws and studs from 1/4 to 1-1/2 inches fall within the scope of ASTM F468, socket head cap screws are covered from size 0 (0.060 inch) to 1-1/2 inches, and metric sizes from M6 to M36 fall within the scope of ASTM F468M. Sizes outside that band are machined to drawing against the applicable bar-stock specification. Custom dimensions can be produced to the drawing. The range covers Inconel bolts, nuts, studs, screws, threaded rods, U-bolts, anchor bolts and other specialised fasteners.
Supply is available across India, with export shipments to the USA, Gulf, European and Asian markets. Each consignment is supplied with material certification, and our company holds AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018 certifications. Ready stock is maintained in Mumbai, with aerospace, oil and gas, chemical processing, power, marine and pump and valve applications forming important areas of use.
The table below summarises the key details normally required for an initial enquiry, including material standards, grades, sizes, thread systems, fastener forms and certification.
Fastener and raw-material standards serve different purposes. ASTM F468 and F467 cover finished fasteners, while the ASTM B-series specifications cover the corresponding alloy bar stock. Dimensional standards define thread, head and nut geometry.
ASTM F468 / F468M for bolts, screws and studs; ASTM F467 / F467M for nuts; ASTM A1014 / A1014M for Grade 718 bolting; ASTM F2281 for heat-resistant nickel alloy bolting; ASTM A453 Grade 660 for Alloy 660 bolting.
| Standard | Scope |
|---|---|
| ASTM F468 / F468M | Nonferrous bolts, screws and studs |
| ASTM F467 | Nonferrous nuts |
| ASTM A453 / A453M Grade 660 | High-temperature Grade 660 bolting |
| ASTM B166 | Nickel-chromium-iron alloy bar for Grades 600 and 601 |
| ASTM B446 | Nickel-chromium-molybdenum-niobium alloy bar for Grade 625 |
| ASTM B637 | Precipitation-hardening alloy bar for Grade 718 |
| ASME B18.2.1 / B18.2.2 / B18.3 | Bolt, nut and socket screw dimensions |
| DIN 912 / 931 / 933 / 934 | Metric screw, bolt and nut dimensions |
| ASTM A1014 / A1014M | Precipitation-hardening Grade 718 bolting for high-temperature service |
| ASTM F2281 | Stainless steel and nickel alloy bolts, hex cap screws and studs for heat-resistant and high-temperature service, 1/4 inch and larger |
Grade selection depends primarily on temperature, corrosion exposure and required mechanical strength.
Inconel 600 provides good resistance to oxidation and corrosion at elevated temperatures. It is used for furnace, heat-treatment and chemical-processing fasteners where a combination of strength and corrosion resistance is required.
Inconel 625 contains molybdenum and niobium, which contribute to its strength and resistance to pitting, crevice corrosion and chloride-containing environments. It is commonly selected for marine, chemical and offshore applications.
Inconel 718 develops high strength after solution treatment and ageing. This makes it suitable for high-load applications such as aerospace equipment, gas turbines and other demanding mechanical assemblies. For high-temperature bolting, Grade 718 is normally ordered against ASTM A1014 / A1014M, with bar stock to ASTM B637.
Inconel 601 offers strong oxidation resistance at elevated temperatures. Its aluminium content contributes to the formation of a protective oxide layer, making the grade suitable for furnace and heat-treatment equipment.
Inconel 660A, also designated as A-286, is a precipitation-hardening stainless alloy used for high-strength bolting at elevated temperatures. It is commonly selected for aerospace, power and high-temperature mechanical assemblies.
Metric and inch sizes are available for different applications. Common sizes can be supplied from ready stock, while non-standard dimensions are machined to drawing.
| Parameter | Range |
|---|---|
| Bolt and Screw Diameter | M3 to M56; 3/16 to 2 inches |
| Nut Size | M3 to M56; 3/16 to 2 inches |
| Washer Size | M3 to M56; 3/16 to 2 inches |
| Bolt and Screw Length | 6 mm to 200 mm; longer to order |
| Thread Standards | Metric, UNC, UNF, BSW and BSF |
| Custom Sizes | Machined to drawing |
Inconel screws are available with several head and drive configurations:
The range covers standard and specialised fastener configurations for industrial assemblies.
Fasteners are packed according to order quantity and destination. Small lots are packed in cartons or boxes, while larger consignments can be supplied in wooden cases or export-grade packaging.
Each package is identified with the grade, size, heat number and applicable specification. Domestic orders are dispatched across India from Mumbai, while export consignments are supplied to the USA, Gulf, European and Asian markets.
Ready-stock items can generally be dispatched within 1 to 2 days. Made-to-order fasteners require approximately 30 days, depending on the grade, size and manufacturing requirements.
Each consignment is supplied with material certification covering the supplied grade and heat. Dimensional checks and thread gauging are carried out before packing, while positive material identification and third-party inspection can be arranged when specified by the purchase order.
EN 10204 3.2 certification can also be provided when required. Amigo Impex holds AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018 certifications.
Contact Amigo Impex with the required grade, size and quantity for a current quotation.
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
Inconel fasteners include Inconel nuts, bolts, screws, studs and related components designed for applications requiring resistance to elevated temperatures and corrosive environments.
Inconel 600 and 601 are suitable for many high-temperature and oxidation-resistant applications. Inconel 625 is preferred where chloride and marine corrosion resistance is important, while Inconel 718 and 660A are selected for applications requiring higher strength.
Yes, some Inconel grades, particularly precipitation-hardened grades such as 718, can provide substantially higher strength than conventional austenitic stainless steel fasteners. Grade selection should still be based on the required temperature, corrosion resistance and mechanical properties.
Magnetic response varies by alloy and condition. Some Inconel fasteners are generally non-magnetic or weakly magnetic, while cold working can increase magnetic response. A magnet test should not be used to confirm the exact grade.
Inconel fasteners generally cost more because of their high nickel and alloy content, specialised raw materials and more demanding machining requirements. The final price also varies with grade, size, quantity and raw-material costs.
No. These grades belong to a related nickel-iron-chromium alloy family (Incoloy Fasteners) rather than Inconel. They should therefore be specified by their correct material designation on the purchase order.
Bolts and screws are available from M3 to M56 and 3/16" to 2", in lengths up to 200 mm. Nuts and washers are supplied to match the bolt size. Larger dimensions are available to order.
The combination of high-temperature performance, corrosion resistance and mechanical strength makes Inconel fasteners suitable for demanding applications across several industries:
