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    Heavy Hex Bolts for Structural & Pressure Equipment

    Heavy hex bolts and complete bolt sets for structural and mechanical applications, manufactured to international standards with full material certification.

    Hex bolts and bolt sets for structural and mechanical assemblies
    Heavy hex bolts with matching nuts and washers
    EN 10204 3.1 Certified
    ISO 9001 Quality
    Zinc yellow trivalent coated heavy hex bolts with rolled threads
    Zinc yellow trivalent coated heavy hex bolts supplied with coating and mill certification

    Overview

    Our heavy hex bolt range covers structural bolting for steel connections through to mechanical grade fasteners for equipment assembly. We supply hex bolts in partial and full thread configurations, complete with matching nuts and washers where required. All bolts are manufactured to ASTM, ISO, or DIN specifications and supplied with full EN 10204 3.1 material certification, ensuring traceability for safety-critical applications.

    EMG supplies hex bolts in over 50+ material grades — from ASTM A325 structural to Inconel 718 — with dimensional inspection to ASME B18.2.1 and full EN 10204 3.1 material certification.

    Typical Applications

    • Structural steel connections in buildings and bridges
    • Heavy machinery and equipment mounting
    • Pipe rack and support structure assembly
    • Offshore platform structural joints
    • Industrial equipment frames and bases
    • Crane and lifting equipment connections

    Fastener Types We Supply

    • Heavy hex bolts to ASTM A325 / A490 for structural applications
    • Hex head cap screws to ASTM A449 for mechanical assemblies
    • ISO 4014 partial thread hex bolts (metric)
    • ISO 4017 full thread hex bolts (metric)
    • DIN 931 / DIN 933 hex bolts for European specifications

    Common Materials & Grades

    ASTM A193 B7ASTM A193 B7MASTM A193 B5ASTM A193 B6ASTM A193 B8 / B8MASTM A193 B8TASTM A193 B8CASTM A193 B16ASTM A320 L7 / L7MASTM A320 L43ASTM A453 660 Class A & DASTM A325 Type 1 & 3ASTM A490 Type 1Grade 8.8 / 10.9 / 12.9304 / 316 / 321 StainlessDuplex 2205 (F51)Super Duplex 2507 (F53)Inconel 625 / 718Monel 400 / K-500Incoloy 825

    Standards & Documentation

    • EN 10204 3.1 Mill Test Reports with chemical and mechanical properties
    • Heat number traceability through production process
    • Dimensional inspection to ASME B18.2.1 / ISO 4014/4017
    • Hardness testing and proof load verification
    • ISO 9001:2015 certified manufacturing

    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 BoltsNuts & WashersSocket ScrewsASTM StandardsAPI 20E & 20F Bolting
    FREQUENTLY ASKED QUESTIONS

    Technical FAQs

    What is the difference between ASTM A325 and A490 hex bolts?

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    ASTM A325 bolts are medium-carbon steel with a minimum tensile strength of 120 ksi (827 MPa), used for general structural connections. ASTM A490 bolts are alloy or martensite steel with a minimum tensile strength of 150 ksi (1034 MPa), used where higher strength is required. A490 bolts should not be galvanized due to hydrogen embrittlement risk.

    Can you supply hex bolts to both imperial and metric standards?

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    Yes. We supply hex bolts to imperial standards (ASTM A325, A490, ASME B18.2.1) and metric standards (ISO 4014, ISO 4017, DIN 931/933). All bolts are supplied with EN 10204 3.1 material certification regardless of dimensional standard.

    Do you supply matching nuts and washers with hex bolt orders?

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    Yes. We supply complete bolt sets including matching heavy hex nuts (ASTM A194 or A563) and hardened washers (ASTM F436 or F844). Components are matched by material grade and can be supplied with consolidated certification for complete traceability.

    What hex bolt grades are suitable for high-temperature service?

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    For elevated temperature service, ASTM A193 B16 (chrome-moly-vanadium) hex bolts are recommended for sustained temperatures up to 593°C. For temperatures above this, A453 Grade 660 or Inconel 718 hex bolts provide superior creep resistance and bolt load retention.
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