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    Galvanised stud bolts with matched heavy hex nuts
    ASTM A194 & ALLOY NUTS

    Heavy hex nuts by grade

    Matched heavy hex nuts for every stud grade we supply — from A194 2H to super duplex and Inconel 718. Buy-to-order, lead time quoted per RFQ, with EN 10204 3.1 / 3.2 records.

    Request a QuoteStud bolt grades
    CHOOSE A GRADE

    12 nut grades, each paired to its stud

    Families: Carbon steel · Carbon-molybdenum steel · Chromium-molybdenum alloy steel · Alloy steel · Austenitic stainless · Stabilised stainless · Duplex stainless · Super duplex stainless · Precipitation-hardened nickel alloy · Nickel-molybdenum-chromium alloy.

    Coated ASTM A194 2H heavy hex nutsA194 2H
    Carbon steel, quenched & tempered

    ASTM A194 Grade 2H Heavy Hex Nuts

    Pairs with ASTM A193 B7 stud bolts

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    Coated stud bolts with matched heavy hex nutsA194 2HM
    Carbon steel, hardness-controlled

    ASTM A194 Grade 2HM Heavy Hex Nuts

    Pairs with ASTM A193 B7M stud bolts

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    Hot-dip galvanised stud bolts with heavy hex nutsA194 Grade 4
    Carbon-molybdenum steel

    ASTM A194 Grade 4 Heavy Hex Nuts

    Pairs with ASTM A193 B16 stud bolts

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    Zinc-plated stud bolts and heavy hex nutsA194 Grade 7
    Chromium-molybdenum alloy steel

    ASTM A194 Grade 7 Heavy Hex Nuts

    Pairs with ASTM A320 L7 stud bolts

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    Coated stud bolts with matched heavy hex nutsA194 7M
    Alloy steel, hardness-controlled

    ASTM A194 Grade 7M Heavy Hex Nuts

    Pairs with ASTM A320 L7M stud bolts

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    Stainless heavy hex nuts laid out for inspectionA194 Grade 8
    Austenitic stainless (304)

    ASTM A194 Grade 8 Heavy Hex Nuts

    Pairs with ASTM A193 B8 stud bolts

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    Blue-coated hex nut with EMG and 8M markings and visible internal threadsA194 8M
    Austenitic stainless (316)

    ASTM A194 Grade 8M Heavy Hex Nuts

    Pairs with ASTM A193 B8M stud bolts

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    Stainless steel heavy hex nutsA194 8T
    Stabilised stainless (321)

    ASTM A194 Grade 8T Heavy Hex Nuts

    Pairs with ASTM A193 B8T stud bolts

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    Three EMG hex nuts with S32205 markings and visible internal threadsDuplex 2205
    Duplex stainless

    Duplex 2205 Heavy Hex Nuts

    Pairs with Duplex 2205 stud bolts

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    Three EMG hex nuts marked 2507 with machined thread openingsSuper Duplex 2507
    Super duplex stainless

    Super Duplex 2507 Heavy Hex Nuts

    Pairs with Super Duplex 2507 stud bolts

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    Hex nuts marked IN 718 with visible machined threads in a lined cartonInconel 718
    Precipitation-hardened nickel alloy

    Inconel 718 Heavy Hex Nuts

    Pairs with Inconel 718 stud bolts

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    Large-diameter nuts in machiningAlloy C-276
    Nickel-molybdenum-chromium alloy

    Alloy C-276 Heavy Hex Nuts

    Pairs with Alloy C-276 stud bolts

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    Reference information only. Photos show nut form and finish, not a specific grade. Your specification and supplied certificates govern; no stock is implied.