Inconel Fasteners
Manufacturer
India · Mumbai
Mumbai’s Inconel Alloy Fastener Specialist
Akbar Fasteners Pvt. Ltd. manufactures Inconel fasteners from our ISO 9001:2015 certified Mumbai facility. The Inconel (Ni-Cr) alloy family — developed and trademarked by Special Metals Corporation — covers a range of nickel-chromium superalloys designed for applications where both high-temperature strength and corrosion resistance must be maintained simultaneously. The two most commonly specified Inconel fastener grades are Inconel 625 (UNS N06625) for corrosion-critical service and Inconel 718 (UNS N07718) for high-strength high-temperature service.
Inconel 625 is specified for seawater service, offshore platform bolting, subsea equipment, marine heat exchangers, and high-temperature chemical plant where both corrosion resistance and strength beyond stainless steel are required. Monel K500 (UNS N05500) provides an alternative for pure seawater service at lower cost; Inconel 625 is preferred where higher strength (≥827 MPa vs K500’s ≥1000 MPa age-hardened, but 625 is supplied annealed at ≥827 MPa vs 400’s ≥480 MPa) combined with high-temperature resistance above 500°C is required.
Inconel 718 is the aerospace and gas turbine standard — age-hardened to ≥1241 MPa with ≥1034 MPa yield strength, it is the highest-strength of all nickel superalloy fasteners in common industrial supply. For oil and gas downhole applications, gas turbine casing bolts, and high-temperature pressure vessel connections requiring both extreme strength and oxidation resistance, Inconel 718 is the specification.
ASTM B446 (625) · B637 (718)
Inconel 625 per ASTM B446 (rod/bar) and Inconel 718 per ASTM B637 (precipitation-hardened). Both with full UNS designation, composition, and mechanical property certification.
100% PMI XRF — Every Lot
All Inconel bar stock PMI-verified by XRF spectrometer before machining. Inconel 625 and 718 are high-value alloys — PMI eliminates the risk of substitution with lower-grade material.
NABL-Accredited Test Reports
Tensile strength, hardness, and Charpy impact from NABL-accredited laboratories on every lot. For Inconel 718, precipitation-hardened condition certificates with UTS ≥1241 MPa confirmed.
Export 50+ Countries — 24hr RFQ
Regular Inconel fastener supply to offshore operators, oil and gas EPC contractors, power generation projects, and aerospace subcontractors across 50+ countries. WhatsApp: +91 8696 32 4646.
Inconel Grade Profiles
Four Inconel grades available as fasteners from Akbar Fasteners Pvt. Ltd. The grade selection is determined by the service temperature, strength requirement, and corrosion environment. 625 is the default corrosion-first choice; 718 is the high-strength choice.
Inconel 625
Inconel 718
Inconel 600
Inconel 601
Inconel Fastener Types & Standards
All forms machined from ASTM-certified Inconel bar stock. Inconel 625 and 718 are the primary stocking grades. Inconel 600 and 601 available on order. PMI-verified, full MTC, NABL test reports.
Inconel Stud Bolts
Fully threaded and double-end. Inconel 625 and 718. Class 150–2500. M12–M100, lengths to 3,000mm. ASME B16.5 pressure flanges in high-temperature chemical plant, offshore, and subsea. Matched heavy hex nuts from same certified heat on request.
Inconel Hex Bolts
Full thread, partial thread, heavy hex. M6–M100. Inconel 625 for seawater and offshore structural bolting. Inconel 718 for high-temperature gas turbine casing bolts and high-pressure vessel connections. Matched nuts from same heat on request.
Inconel Hex Nuts
Standard hex, heavy hex, coupling nuts. M6–M100. Matched from same certified Inconel heat as stud bolts — Inconel 625 for seawater/offshore assembly, Inconel 718 for high-strength gas turbine flange assemblies. One MTC covers the complete stud bolt set.
Inconel Washers
Plain flat, spring helical. M5–M100. Inconel 625 washers for matched-alloy seawater and offshore assemblies. Same-heat supply available. Zero galvanic potential at the washer-nut bearing face in seawater service.
Inconel Threaded Rods
Full thread and end-thread. M6–M100, lengths to 3,000mm. Inconel 625 threaded rods for offshore hanger systems, marine equipment support rods, and high-temperature chemical plant structural rods requiring seawater immunity and elevated temperature strength.
Inconel Socket Cap Screws
Hex socket cylindrical head. M4–M36. Inconel 625 for confined-access marine equipment bolting — subsea instrument enclosures, seawater pump internals. Inconel 718 for gas turbine internal access bolting.
Matched Assembly Sets
Inconel 625 stud bolts + heavy hex nuts + washers from same ASTM B446 certified heat. Single MTC, PMI, and COC for the complete stud bolt set — simplified TPI documentation for offshore and power generation EPC projects.
Custom & AMS-Certified
Inch UNC/UNF thread, AMS 5666 (Inconel 625) and AMS 5663 (Inconel 718) certified for aerospace and defence procurement, drawing-specific head forms, and non-standard diameters. Contact sales@akbarfasteners.in with your specification.
Industry Applications
High-temperature and corrosive environments where stainless steels lose strength — Inconel 625 for seawater and corrosion-first, Inconel 718 for strength-first and gas turbine/aerospace.
Gas Turbines
high-temp combustion bolts
Offshore & Subsea
subsea equipment bolts
Oil & Gas Downhole
high-pressure completion bolts
Chemical Processing
Inconel 625 process bolts
Marine Seawater
heat exchanger bolts
Power Generation
high-pressure steam flanges
Aerospace & Defence
aerospace structural bolts
Heat Treatment Furnaces
high-temp oxidation resistance
Inconel Fastener Standards Coverage
Same quality system as our Hastelloy B3 stud bolts and complete exotic alloy range. Full heat traceability and NABL-accredited testing on every order.
Complete Documentation Package
Heat & Lot Traceable
Conformance
100% Lots Verified
Tensile · Hardness
TÜV · BV · Lloyds
Need Inconel 625 or
Inconel 718 Fasteners?
Grade · product form · size · quantity · ASME class · documentation. Akbar Fasteners Pvt. Ltd. responds within 24 hours with pricing, lead time, and MTC documentation list.
Export: +91 8696 32 4646 · Support: +91 800 9315 333 · export@akbarfasteners.in