Exotic Alloy
Bolt Manufacturer
India · Mumbai
Mumbai’s Exotic Alloy Bolt Specialist Since 1998
Akbar Fasteners Pvt. Ltd. was established in Mumbai in 1998 specifically to address the gap in exotic alloy fastener supply for India’s growing chemical, petrochemical, offshore, and marine industries. While most fastener manufacturers supply standard carbon steel and stainless steel, we specialise exclusively in corrosion-resistant alloy bolts — the exotic grades that chemical plant and offshore engineers specify when standard materials fail within months.
Our Mumbai manufacturing facility produces the complete bolt range — hex bolts (DIN 931 / DIN 933), stud bolts (ASME B16.5), heavy hex bolts (ASME B18.2.3.6M), flanged hex bolts (DIN 6921), and socket cap screws (DIN 912) — in Hastelloy, Monel, Inconel, Duplex 2205, Super Duplex 2507, Alloy 20, and Titanium Grade 5. Every order starts from mill-certified UNS-designated bar stock, XRF PMI-verified against the MTC before machining, and dispatched with NABL-accredited tensile and hardness test reports.
Our 500+ global client base includes EPC contractors, chemical plant operators, offshore platform owners, naval shipyards, and pharmaceutical manufacturers across 50+ countries. For over 25 years, engineers across the world have relied on Akbar Fasteners when the bolt material specification is non-negotiable and certification quality is critical.
Mill-Certified UNS Bar Stock
Every bolt starts from certified bar — ASTM B574, B335, B865, B164, and equivalent. XRF PMI on every lot before machining. No substitution, no mix-ups.
NABL-Accredited Test Reports
Tensile strength, hardness (HRB/HRC/HB), and Charpy impact from accredited laboratories. Third-party inspection by TÜV, Bureau Veritas, Lloyds on request.
Export to 50+ Countries
Regular shipments to UAE, Saudi Arabia, USA, UK, Germany, Singapore, Australia, Brazil, Canada, and 40+ more countries. Packing as per ISTA standards for export.
24-Hour RFQ Response
Alloy · bolt type · size · length · quantity. Quotes within 24 hours including full pricing, lead time, and documentation scope. WhatsApp: +91 8696 32 4646.
Exotic Alloy Bolt Types
Hex Bolts — DIN 931 / DIN 933
Standard metric hex bolts in exotic alloys — full thread (DIN 933 / ISO 4017) and partial thread with plain shank (DIN 931 / ISO 4014). M6 to M100, custom lengths. The most common bolt form for chemical equipment covers, reactor body connections, agitated vessel bolting, and structural connections in corrosive environments. Also supplied in inch UNC / UNF per ASME B18.2.1.
All alloys available: Hastelloy C276, C22, B3, B2 · Monel K500, 400 · Inconel 625, 718 · Duplex 2205 · Super Duplex 2507 · Alloy 20 · Titanium Grade 5.
Stud Bolts — ASME B16.5 / ASME B18.31.2
Fully threaded and double-end (equal-end and unequal-end) stud bolts to ASME B16.5 for pressure flange joints. Class 150 to Class 2500. M12 to M100, lengths to 3,000mm. The standard exotic alloy fastener for chemical plant, oil and gas, and offshore flanged connections in corrosive service. Matched heavy hex nuts from the same certified heat on request — single MTC for the complete assembly.
Heavy Hex Bolts — ASME B18.2.3.6M
Wider across-flats and greater head height than standard DIN 933 hex bolts — for high-torque chemical reactor cover bolting, large-diameter agitated vessel closures, and equipment access flanges where maximum wrench bearing area is required alongside exotic alloy corrosion resistance. M12 to M100. Matched heavy hex nuts from same certified heat available on request.
Socket Cap Screws — DIN 912 / ISO 4762
Hex socket cylindrical head cap screws in exotic alloys for confined-access bolting in chemical reactor internals, agitator baffle attachment, heat exchanger internal fixtures, instrument flange connections, and seawater pump internals where standard hex head clearance is unavailable. M4 to M48. Same UNS-certified bar stock as hex bolts and stud bolts.
Flanged Hex Bolts — DIN 6921 / ISO 4162
Integrated serrated or plain flange (washer face) under head — distributes bolt load over greater bearing area without a separate washer. Used in FRP-lined vessel nozzle connections, composite equipment covers, and chemical plant connections through soft substrates in mixed acid environments where a separate washer is impractical. M6 to M64. Available in Hastelloy C276, C22, Monel K500, and Duplex grades.
Exotic Alloys We Manufacture Bolts In
All alloys from certified UNS-designated mill bar stock with full traceability. Click any alloy card to reach the product-specific page with composition data, dimension tables, and standards information.
Hastelloy C276
Hastelloy C22
Hastelloy B3
Hastelloy B2
Monel K500
Monel 400
Hastelloy C22 Stud Bolts
Hastelloy C4 / CX / G-30
Alloy 20 (Carpenter 20)
Inconel 625
Duplex 2205 / Super Duplex 2507
Titanium Grade 2 / Grade 5
Bolt Standards We Manufacture & Test To
All exotic alloy bolts manufactured from certified mill bar stock to the following material, dimensional, and testing standards. Full heat traceability from mill to dispatch.
Complete Documentation Package
Heat & Lot Traceable
Conformance
100% Lots Verified
Tensile · Hardness
TÜV · BV · Lloyds
Need Exotic Alloy
Bolts from India?
Alloy · bolt type · size · length · quantity · documentation. Akbar Fasteners Pvt. Ltd. Mumbai responds within 24 hours with full pricing, lead time, and MTC documentation list.
Export: +91 8696 32 4646 · Support: +91 800 9315 333 · export@akbarfasteners.in