RapidBoltGet a Quote
    Back to Products

    Special Fasteners for Turbines, Subsea & OEM Programs

    Custom engineered fasteners for unique and demanding applications including turbine bolts, 12-point fasteners, U-bolts, and bespoke designs in high-performance alloys.

    Custom engineered fasteners manufactured to project specifications
    Special machined fasteners for demanding industrial applications
    EN 10204 3.1 Certified
    ISO 9001 Quality

    Overview

    When standard fasteners don't meet your requirements, our special fasteners division provides custom-engineered solutions. From gas turbine bolting in superalloys to custom anchor bolts for civil infrastructure, we manufacture to your drawings and specifications. Our capabilities include CNC machining, hot forging, and specialized thread forms, all backed by comprehensive EN 10204 3.1 documentation and PMI verification.

    EMG manufactures custom fasteners in over 50+ superalloy and specialty materials — including Inconel 718, Waspaloy, and MP35N — with first article inspection and full PMI verification on every component.

    Typical Applications

    • Gas turbine rotor and casing bolts
    • Compressor and expander fasteners
    • Subsea wellhead and tree connections
    • Reactor internals and nuclear components
    • Anchor bolts for heavy civil construction
    • Pipe supports and structural connections

    Fastener Types We Supply

    • Turbine bolts with reduced shank and 12-point drive
    • 12-point flange head bolts for high-torque applications
    • U-bolts in standard and custom configurations
    • J-bolts and anchor bolts for civil foundations
    • Eye bolts and lifting points
    • Custom machined fasteners to customer drawings

    Common Materials & Grades

    Inconel 718Inconel 625WaspaloyA286MP35NHastelloy XNimonic 80A17-4 PHDuplex 2205 (F51)Super Duplex 2507 (F53)Durehete 1055Durehete 950ASTM A193 B16ASTM A453 660 Class A, B, C & DCustom alloys per specification

    Standards & Documentation

    • EN 10204 3.1 Mill Test Reports with full chemical and mechanical properties
    • PMI (Positive Material Identification) testing on all alloy components
    • First article inspection reports (FAIR) for custom designs
    • Dimensional inspection to customer drawings and tolerances
    • Non-destructive testing (UT, MT, PT) as required
    • ISO 9001:2015 and AS9100D quality systems

    NEED MACHINED COMPONENTS TOO?

    Spacers, blinds, special nuts, shafts and bushes — supplied to your drawing with the same traceability as your bolting. Precision Machined Components →

    RELATED RESOURCES

    Precision Machined ComponentsStud BoltsSocket ScrewsCoated FastenersAPI 20E & 20F BoltingNORSOK M-650
    FREQUENTLY ASKED QUESTIONS

    Technical FAQs

    What materials are used for gas turbine bolts?

    +
    Gas turbine bolts are typically manufactured from precipitation-hardened superalloys such as Inconel 718, Waspaloy, A286, and Nimonic 80A. These materials maintain their strength and creep resistance at temperatures exceeding 650°C, which is essential for turbine casing and rotor bolting where thermal cycling and sustained high temperatures are the norm.

    Can you manufacture fasteners from customer drawings?

    +
    Yes. We regularly manufacture custom fasteners from customer drawings and specifications. Our process includes engineering review, material procurement with full traceability, CNC machining or hot forging, dimensional inspection, and comprehensive testing. First article inspection reports (FAIR) are provided for initial production runs.

    What is a 12-point flange head bolt and when is it used?

    +
    A 12-point flange head bolt has a twelve-sided head that provides a larger bearing surface than a hex bolt and allows higher torque application. They are commonly used in gas turbine assemblies, compressor casings, and other applications where high clamping force and precise tensioning are required in confined spaces.

    Do you supply anchor bolts and foundation bolts?

    +
    Yes. We supply straight, bent, and hooked anchor bolts to ASTM F1554 (Grade 36, 55, and 105) and custom specifications. Anchor bolts can be supplied hot-dip galvanized per ASTM A153 or with other corrosion protection coatings. All anchor bolts include full material certification and dimensional verification.
    GET IN TOUCH

    Need a Quote for Special Fasteners?

    Send us the size, grade and quantity — or your drawings and bill of materials — and we'll return a technical quote for special fasteners with lead times and certification included.

    Request a Special Fasteners QuoteCall Now

    Emergency Support

    24/7 availability for critical projects