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    Metric Stud Bolts — B7/2H, M10 to M100

    Metric ASTM A193 B7 stud bolts with A194 2H heavy hex nuts, cut to any length, certified to EN 10204 3.1 and dispatched on urgent lead times for shutdowns and breakdowns across Australia.

    Metric ASTM A193 B7 stud bolts with A194 2H heavy hex nuts
    B7 studs supplied as matched kits with 2H heavy hex nuts
    EN 10204 3.1 Certified
    ISO 9001 Quality
    Boxed metric B7/2H stud bolt kits ready for urgent dispatch
    Kits boxed, labelled by size and heat number, ready to dispatch

    Overview

    Metric stud bolts are specified wherever flanges, vessels and equipment are designed to ISO, EN or DIN standards — common on European-built compressors, pumps, skids and packaged plant installed across Australian oil and gas, mining and power sites. EMG supplies metric ASTM A193 B7 (and its 42CrMo4 equivalent) stud bolts from M10 to M100 in coarse and fine pitch, continuous thread or double-end, cut to any length and paired with ASTM A194 2H metric heavy hex nuts. Every kit ships with heat-matched EN 10204 3.1 certification, and urgent orders are handled on short lead times through our RapidBolt emergency service.

    EMG supplies metric B7/2H stud bolts from M10 to M100, cut to any length, heat-matched with metric heavy hex nuts and EN 10204 3.1 certified — with urgent dispatch available for shutdowns and breakdowns anywhere in Australia.

    Typical Applications

    • EN 1092-1 and DIN metric flange bolting on process piping
    • European-built compressors, pumps and packaged skids
    • Pressure vessel, heat exchanger and manway closures designed to metric standards
    • Valve bonnet and actuator mounting on imported metric valves
    • Mining and mineral processing plant with metric equipment flanges
    • Shutdown, turnaround and breakdown replacement bolting on urgent timelines

    Metric Stud Configurations We Supply

    • Metric continuous-thread (all-thread) B7 studs cut to length
    • Metric double-end B7 studs with defined thread lengths
    • Metric tap-end studs for blind tapped holes
    • Complete metric B7/2H kits with two heavy hex nuts per stud
    • Metric fine-pitch studs (e.g. M36x3, M42x3) to order
    • Coated metric kits in Xylan 1424, PTFE, GEOMET or hot-dip galvanised

    Common Materials & Grades

    ASTM A193 B7 (metric)42CrMo4 / AISI 4140ASTM A194 2H metric heavy hex nutsASTM A193 B7M (sour service)ASTM A320 L7 (low temperature)ASTM A193 B8 / B8M stainless

    Standards & Documentation

    • ASTM A193/A193M Grade B7 in metric sizes
    • ASTM A194/A194M Grade 2H metric heavy hex nuts
    • ISO 261 / ISO 965 metric thread form, coarse and fine pitch
    • EN 1092-1 and DIN flange bolting dimensions
    • EN 10204 3.1 mill test reports with heat number traceability
    • Hardness testing and PMI available as an additional test package

    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

    Stud Bolts HubConfigure a Stud Bolt KitASTM A193 B7 Stud BoltsB7M Sour Service StudsPetrochemical Stud Bolts PerthXylan & PTFE Coated BoltsRapidBolt Emergency SupplyISO Fastener StandardsASTM StandardsAlloy Steel Materials

    Metric sizes we supply most often

    The most requested metric stud bolt sizes on Australian sites are M16, M20, M24, M27, M30, M33, M36, M39, M42, M45, M48, M52, M56 and M64, used across PN16 to PN100 metric flange classes. EMG also supplies smaller M10 and M12 studs for instrument and small-bore connections, and large-diameter M72 to M100 studs for heavy vessel and exchanger closures. Coarse pitch is standard; above M36 many European flange designs call for a 3 mm or 4 mm fine pitch, so the pitch should always be confirmed on the drawing or the enquiry.

    Why metric and imperial must never be mixed

    An M24 stud and a 1in stud look similar on a laydown pad, but the threads are not interchangeable. Forcing an imperial nut onto a metric stud — or the reverse — damages the thread flanks and dramatically reduces the load the joint can carry. On shutdowns where both systems are present, EMG labels every kit by size, pitch and heat number so the right bolting reaches the right joint.

    Urgent lead times for shutdowns and breakdowns

    Metric stud bolt shortages are a common cause of shutdown delays, because the bulk of Australian stock is imperial. EMG holds common metric B7 bar and 2H nuts and can cut, thread, coat and certify studs on compressed timelines. For breakdowns and outage-critical jobs, RapidBolt — our emergency bolting division — provides a direct line to quote and dispatch urgent metric kits to Brisbane, Gladstone, Perth, the Pilbara, Darwin and remote sites.

    Choosing the right metric grade

    B7 with 2H nuts is the default for general high-pressure flange bolting. Where the process contains H2S, NACE MR0175 / ISO 15156 requires hardness-controlled B7M with 2HM nuts. Low-temperature duty calls for impact-tested L7. Seawater and corrosive environments may need stainless B8M, duplex, super duplex or nickel alloy studs. EMG supplies every one of these grades in metric sizes, so the choice is driven by engineering, not availability.

    FREQUENTLY ASKED QUESTIONS

    Technical FAQs

    Do you supply metric B7 stud bolts in Australia?

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    Yes. EMG supplies metric ASTM A193 B7 stud bolts from M10 to M100 with ASTM A194 2H metric heavy hex nuts, delivered to Brisbane, Gladstone, Perth, the Pilbara, Darwin and sites Australia-wide, with EN 10204 3.1 certification.

    How quickly can you supply urgent metric stud bolts?

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    Common metric sizes can be cut, threaded and dispatched quickly from stock bar. Coated or large-diameter studs take longer depending on the coating and testing required. For breakdowns and shutdowns, contact RapidBolt, our emergency bolting service, for the fastest possible turnaround.

    What is the difference between metric B7 and 42CrMo4 studs?

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    Both are quenched and tempered chromium-molybdenum alloy steels with very similar chemistry. B7 is certified to the ASTM A193 specification, while 42CrMo4 is the European material designation. Where a drawing calls for ASTM A193 B7, the studs must be certified to that specification — EMG supplies either, as specified.

    Can metric stud bolts be supplied in fine pitch?

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    Yes. Fine-pitch metric studs such as M36x3, M42x3, M48x3 and M64x4 are supplied to order. Always confirm the pitch on the drawing, as many European flange designs use fine pitch above M36.

    Do metric stud bolt kits include nuts?

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    Yes. Standard kits include one stud and two ASTM A194 2H metric heavy hex nuts, heat-matched and covered by one certificate. Hardened washers can be added on request.

    What coatings are available on metric stud bolts?

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    Xylan 1424, PTFE, GEOMET, zinc-nickel and hot-dip galvanising are available, applied strictly to your specification. Plain black studs are also supplied where the joint will be coated or protected on site.
    GET IN TOUCH

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