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    Three EMG hex bolt heads marked 2507 on a workshop surface
    EMG / ENGINEERING REFERENCE

    Fastener comparison guides

    Compare grades, conditions and procurement requirements for critical industrial bolting. The approved drawing and service specification—not the alloy name alone—control the selection.

    Specify with confidence.

    Equipment bolting reference
    B7M collar bolt and matching nuts illustrating custom fastener geometry, not the featured alloy
    ALLOY STEEL / SOUR SERVICE

    B7 vs B7M stud bolts

    Compare B7/B7M studs and 2H/2HM nuts. Check hardness, sour-service requirements and purchasing records for Australian projects.

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    Three EMG hex bolt heads marked 2507 on a workshop surface
    DUPLEX / OFFSHORE

    Duplex 2205 vs super duplex 2507

    Compare duplex 2205, super duplex 2507 and S32760 fasteners. Review UNS, processing, inspection and offshore procurement requirements.

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    Hex nuts marked IN 718 with visible machined threads in a lined carton
    NICKEL ALLOYS / CRITICAL BOLTING

    Inconel 625 vs 718 vs 725

    Compare Inconel 625, 718 and 725 bolting by alloy identity, strengthening route and procurement checks for power and subsea projects.

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    Precision-machined shafts, housings and threaded components illustrating component applications
    STAINLESS / CLASS & CONDITION

    B8M Class 1 vs Class 2

    Understand B8 and B8M Class 1 versus Class 2, strain hardening and marking checks. Specify class and certificates for stainless bolting.

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    EMG K500-marked hex nuts showing machined internal threads
    NICKEL–COPPER / MARINE BOLTING

    Monel 400 vs Monel K-500

    Compare Monel 400 and K-500 fasteners, heat treatment and material identity. Review nickel-alloy alternatives without assuming interchangeability.

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    B7M collar bolt and matching nuts illustrating custom fastener geometry, not the featured alloy
    AUSTRALIA / ASIA-PACIFIC / COLD SERVICE

    B7 vs L7 vs L7M for LNG

    Compare A193 B7, A320 L7 and L7M for Australian and Asia-Pacific LNG enquiries. Define impact testing, hardness and project acceptance.

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    Blue-coated hex nuts individually separated by protective foam
    COATINGS / ASSEMBLY CONTROL

    Coated bolts: friction & galling

    Review coated-bolt friction, nut factors, thread fit and galling controls. A procurement guide without generic tightening torque recommendations.

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    Three EMG hex bolt heads marked 2507 on a workshop surface
    AUSTRALIA / ASIA-PACIFIC / SPECIFICATION

    Sour-service bolting: define the requirement

    Define sour-service bolting enquiries for Australia and Asia-Pacific: grade, condition, hardness, nuts and traceable project acceptance records.

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