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    About TorqBolt QA-QC

    About TorqBolt QA-QC, TorqBolt 12-point fastener with tB ligature and alloy grade marking

    TorqBolt Pvt Ltd manufactures precision aerospace, motorsport, and industrial fasteners. Head office and quality-control bench: Mumbai. Production facility: Rajkot. The 12pointbolt.com site is the dedicated hub for the 12-point (bi-hex / double-hex) external-drive bolt geometry.

    Quality Systems

    • AS9100D: aerospace quality management system
    • ISO 9001:2015: general quality management system
    • NORSOK M-630: offshore oil-gas material data sheet
    • NACE MR0175 / ISO 15156: sour-service H2S compliance
    • AMPP (formerly NACE): corrosion-engineering qualification

    Manufacturing Capability

    • CNC turning, threading, milling, grinding
    • Heat treatment (solution + age, oil quench, vacuum)
    • Surface treatment (passivation, black oxide, plating)
    • Stamping (manufacturer ligature + alloy grade per lot)
    • QC: digital micrometer, height gauge, optical comparator, hardness
    • Documentation: MTC 3.1 standard, MTC 3.2 critical-service

    Material Capability

    A286, Inconel 718, Ti-6Al-4V (Grade 5), MP35N, Custom 465, AISI 8740 chromoly, AISI 4340, 17-4 PH, H-11 tool steel, L19 race-grade alloy steel, super duplex 2507, Incoloy 925, and most aerospace and oil-gas grades. For deep metallurgy on individual alloys, see the TorqBolt micro-site network: alloya286.com, duplex2507.com, incoloy925.com.

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    DIN Mitglied

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    Frequently asked questions

    What is a 12-point bolt?

    A 12-point bolt has 12 splines arranged every 30 degrees on the OUTSIDE of the bolt head, also called a bi-hex or double-hex bolt. The 12 external splines provide twice the wrench-engagement angles of a standard hex head, allowing higher applied torque before cam-off, which is why aerospace and motorsport applications adopt the geometry.

    Are 12-point bolts the same as ISO 14579?

    No. ISO 14579 specifies an INTERNAL hexalobular socket head (similar to Torx) recessed inside a cap screw. External 12-point bolts under MS21250 / NAS1351 / AS3216 use an EXTERNAL bi-hex head driven by a 12-point socket wrench. Both involve 12 features but on different sides of the bolt head and require different drivers.

    Which alloys does TorqBolt manufacture 12-point bolts in?

    TorqBolt produces 12-point bolts in A286 (UNS S66286), Inconel 718 (UNS N07718), Ti-6Al-4V Grade 5, MP35N (UNS R30035), Custom 465 H1025, AISI 8740 chromoly heat-treated, AISI 4340, 17-4 PH, H-11 tool steel, and L19 race-grade alloy steel. Choice depends on tensile target, service temperature, and corrosion environment.

    Is TorqBolt AS9100D certified?

    Yes. TorqBolt operates under AS9100D Rev D and ISO 9001:2015 quality management systems, audited annually by the registrar. NORSOK M-630 and NACE MR0175 / ISO 15156 qualifications cover offshore and sour-service applications. Mill test reports MTC 3.1 standard and MTC 3.2 critical-service witness are issued with every lot.

    What lead time should I expect?

    Stock alloys (A286, AISI 8740, AISI 4340, 17-4 PH, 316 stainless) ship in 4 to 6 weeks. Specialty alloys (Inconel 718, MP35N, Custom 465, Ti-6Al-4V, L19) ship in 8 to 12 weeks depending on raw-bar lead time at the alloy producer. Critical-service orders requiring third-party witness inspection (MTC 3.2) add 1 to 2 weeks for witness scheduling.