Amigo Impex, based in Mumbai, India, has manufactured, stocked and exported Monel fasteners in India since 2013. Bar cutting, thread production, machining, testing and packing are carried out in-house, allowing components for the same bolting assembly to be supplied with documentation linked to the applicable material heat.
Monel fasteners are nickel-copper alloy fasteners machined from bar. Monel 400 bar is supplied to ASTM B164 / ASME SB-164, and Monel K500 bar is supplied to ASTM B865. Their corrosion resistance is provided primarily by the nickel-copper alloy matrix, which offers resistance to seawater, brines, alkalis and hydrofluoric acid. The range includes Monel 400, which contains a minimum of 63% nickel and 28 to 34% copper, and Monel K500, which contains aluminium and titanium and can be age-hardened for higher-strength applications.
Certified sizes run from 1/4 in to 1-1/2 in under ASTM F468 for bolts, hex cap screws and studs and ASTM F467 for nuts, and from M6 to M36 under the metric companion standards ASTM F468M and ASTM F467M. Anything outside that band, whether M3 or M56, gets machined to drawing against the bar specification instead. The range covers ten fastener types, including hex bolts, nuts, studs, threaded rods, screws, Monel washers, U-bolts, anchor bolts and eye bolts. As one of the established Monel fasteners suppliers, Amigo Impex delivers across pan-India from Mumbai, with export consignments supplied to the USA, Gulf, Europe and Asia. Each order is supplied with the applicable material test documentation. Ready stock of approximately 60 to 70 tonnes supports standard requirements, while pricing is quoted per kilogram according to grade, dimensions, quantity and prevailing nickel and copper costs.
The specification for a Monel fastener order is determined by the grade, applicable product standard, dimensions, thread system and required condition. The table below summarises the standard supply range.
A Monel fastener order can involve separate standards for the finished fastener, the bar stock used for machining and the dimensions of the finished component. The applicable standards should therefore be specified according to the product and drawing requirements.
| Standard | Scope |
|---|---|
| ASTM F468 | Nonferrous bolts, hex cap screws, socket head cap screws and studs |
| ASTM F467 | Nonferrous nuts |
| ASTM B164 / ASME SB164 | Nickel-copper alloy rod, bar and wire (UNS N04400, N04405) used as Monel 400 fastener stock |
| ASTM B865 | Precipitation-hardening nickel-copper-aluminium alloy (UNS N05500) bar, rod and wire used as Monel K500 fastener stock |
| MIL-S-1222H | Studs and bolting for applicable naval and defence procurement |
| ASME B18.2.1 / B18.2.2 | Inch-series bolt and nut dimensions |
| DIN 931 / 933 / 934 | Metric hex bolt and nut dimensions |
| IS 1364 | Hex fastener dimensions for applicable Indian drawings |
Amigo Impex supplies two Monel fastener grades: Monel 400 and Monel K500. Both are nickel-copper alloys, but their mechanical properties and heat-treatment responses differ, making them suitable for different bolting requirements.
Monel 400 fasteners, identified as UNS N04400 and W.Nr. 2.4360, provide corrosion resistance in seawater, alkalis, hydrofluoric acid and other demanding environments. The alloy is strengthened primarily through cold working rather than age hardening.
Monel K500 fasteners, identified as UNS N05500 and W.Nr. 2.4375, contain aluminium and titanium and can be age hardened to achieve higher mechanical strength than Monel 400. This makes the grade suitable for applications where higher preload or strength is required.
Size selection follows the grade, fastener type and thread configuration on the drawing. ASTM F468 and ASTM F467 set the certified inch band, and ASTM F468M and ASTM F467M set the certified metric band. Anything beyond those bands comes from bar to drawing, carrying material certification without product certification.
| Parameter | Range |
|---|---|
| Bolts and Hex Cap Screws | 1/4 in to 1-1/2 in certified to ASTM F468; M6 to M36 certified to ASTM F468M |
| Nuts | 1/4 in to 1-1/2 in certified to ASTM F467; M6 to M36 certified to ASTM F467M |
| Studs and Stud Bolts | 1/4 in to 1-1/2 in certified to ASTM F468; M6 to M36 certified to ASTM F468M |
| Socket Head Cap Screws | Size 0 (0.060 in) to 1-1/2 in, certified to ASTM F468 in socket head cap, button head and flat countersunk head configurations; low head socket cap screws size 4 (0.112 in) to 5/8 in. Metric socket head cap screws are machined to drawing from ASTM B164 or ASTM B865 bar, as ASTM F468M covers bolts, hex cap screws and studs only. |
| Threaded Rods | M6 to M36, held in 1 m and 3 m stock lengths, cut to size on request |
| Beyond the Certified Band | M3 to M5, M40 to M56, 1-3/4 in and 2 in, machined to drawing with material certification. Inch sizes below 1/4 in fall outside ASTM F468 for bolts, hex cap screws and studs, but socket head cap screws remain certified to ASTM F468 down to size 0 (0.060 in) |
| Bolt and Screw Length | 10 mm to 300 mm; longer to drawing |
| Stud and Stud Bolt Length | 25 mm to 500 mm; extended lengths to order |
| Thread Class | 1A, 2A and 3A on external threads; 1B, 2B and 3B on nuts |
| Thread Hand | Right hand; left hand on request |
| Custom Dimensions | Cut and threaded to drawing in Monel 400 and Monel K500 |
Thread form, pitch and head configuration follow the application drawing. Available configurations cover
The Monel fastener range includes Monel bolts and other forms in Monel 400 and Monel K500, subject to grade, dimensions and production requirements:
Stud bolt assemblies for flange connections form an important part of the range, while other fastener types are supplied according to the application and drawing requirements.
Small Monel fastener lots are packed in sealed bags inside labelled cartons, while bulk consignments can be supplied in lined wooden cases with suitable protection for export transport. Each package is identified with the heat number, grade, size and applicable standard.
Despatch covers pan-India from Mumbai, with export orders supplied to the USA, Gulf, Europe and Asia. Ready-stock items can generally be dispatched within 1 to 2 days, while made-to-order production typically requires around 30 days, subject to grade, dimensions and quantity.
Before packing, each Monel fastener lot undergoes positive material identification, dimensional inspection and thread gauging at the Mumbai facility. The applicable material test certificate is supplied with the order, and third-party inspection can be arranged when required by the purchase order. 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
ASTM F468 covers applicable nonferrous bolts, hex cap screws, socket head cap screws and studs, while ASTM F467 covers Monel nuts and other applicable nonferrous nuts. Bar stock is supplied to ASTM B164 / ASME SB-164 for Monel 400 and to ASTM B865 for Monel K500.
Monel 400 is primarily selected for corrosion resistance and general industrial service, while Monel K500 is age-hardenable and provides higher mechanical strength. Monel K500 is therefore considered where greater preload or strength is required.
Monel 400 can exhibit some magnetic response depending on material condition and temperature. Where specific magnetic-performance requirements apply, the actual material condition and application should be considered when selecting the grade.
Monel fasteners are selected for certain seawater applications because their nickel-copper composition provides strong resistance to seawater corrosion. Stainless steel may remain suitable for less severe conditions, so the choice should be based on seawater temperature, velocity, exposure and other service conditions.
Certified sizes run from 1/4 in to 1-1/2 in under ASTM F468 for bolts, hex cap screws and studs and under ASTM F467 for nuts. Metric sizes from M6 to M36 are certified under the metric companion standards ASTM F468M and ASTM F467M. Sizes outside those bands are machined to drawing from ASTM B164 or ASTM B865 bar and supplied with material certification rather than product certification. The one exception is socket head cap screws, which ASTM F468 certifies in inch sizes from size 0 (0.060 in) to 1-1/2 in.
Yes. Monel bolts and studs can be supplied with BSW and BSF threads, as well as metric coarse and fine, UNC, UNF and 8UN thread forms, subject to the required dimensions and specifications.
Yes, each Monel fastener consignment is supplied with the applicable material test certificate. The documentation identifies the material grade and applicable specification, with additional inspection documentation available when required by the purchase order.
Monel fasteners are used in applications where corrosion resistance is required in marine, chemical and other demanding service environments. Major application sectors include:
