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    2. B18.2.3.5M Hex Bolts

    ASME B18.2.3.5M Hex Bolts Dimensions

    Metric hex bolts manufactured according to ASME B18.2.3.5M fastening specifications.

    ASME B18.2.3.5M Hex Bolts are widely used in industrial machinery, automotive systems, structural assemblies, and engineering applications. These metric hex bolts provide accurate dimensional tolerances, reliable clamping force, and consistent fastening performance for metric bolted systems.

    ASME B18.2.3.5M Hex Bolts

    ASME B18.2.3.5M Hex Bolts Dimensions

    Nominal Dia., D and Thread Pitch Body Diameter, Ds Width Across Flats, S Width Across Corners, E Head Height, K Wrenching Height, K1 For Bolt Lengths
    < 125 mm > 125 and < 200 mm < 200 mm
    Max Min Max Min Max Min Max Min Min Basic Thread Length, a B
    ANSI B18.2.3.5M - M5 × 0.8 5.48 4.52 8 7.64 9.24 8.63 3.58 3.35 2.4 16 22 35
    ANSI B18.2.3.5M - M6 × 1 6.19 5.52 10 9.64 11.55 10.89 4.38 3.55 2.8 18 24 37
    ANSI B18.2.3.5M - M8 × 1.25 8.58 7.42 13 12.57 15.01 14.2 5.68 5.1 3.7 22 28 41
    ANSI B18.2.3.5M - bM10 × 1.5 10.58 9.42 15 14.57 17.32 16.46 6.85 6.17 4.5 26 32 45
    ANSI B18.2.3.5M - M10 × 1.5 10.58 9.42 16 15.57 18.48 17.59 6.85 6.17 4.5 26 32 45
    ANSI B18.2.3.5M - M12 × 1.75 12.7 11.3 18 17.57 20.78 19.85 7.95 7.24 5.2 30 36 49
    ANSI B18.2.3.5M - M14 × 2 14.7 13.3 21 20.16 24.25 22.78 9.25 8.51 6.2 34 40 53
    ANSI B18.2.3.5M - M16 × 2 16.7 15.3 24 23.16 27.71 26.17 10.75 9.68 7 38 44 57
    ANSI B18.2.3.5M - M20 × 2.5 20.84 19.16 30 29.16 34.64 32.95 13.4 12.12 8.8 46 52 65
    ANSI B18.2.3.5M - M24 × 3 24.84 23.16 36 35 41.57 39.55 15.9 14.56 10.5 54 60 73
    ANSI B18.2.3.5M - M30 × 3.5 30.84 29.16 46 45 53.12 50.55 19.75 17.92 13.1 66 72 85
    ANSI B18.2.3.5M - M36 × 4 37 35 55 53.8 63.51 60.79 23.55 21.72 15.8 78 84 97
    ANSI B18.2.3.5M - M42 × 4.5 43 41 65 62.9 75.06 71.71 27.05 25.03 18.2 90 96 109
    ANSI B18.2.3.5M - M48 × 5 49 47 75 72.6 86.6 82.76 31.07 28.93 21 102 108 121
    ANSI B18.2.3.5M - M56 × 5.5 57.2 54.8 85 82.2 98.15 93.71 36.2 33.8 24.5 ... 124 137
    ANSI B18.2.3.5M - M64 × 6 65.52 62.8 95 91.8 109.7 104.65 41.32 38.68 28 ... 140 153
    ANSI B18.2.3.5M - M72 × 6 73.84 70.8 105 101.4 121.24 115.6 46.45 43.55 31.5 ... 156 169
    ANSI B18.2.3.5M - M80 × 6 82.16 78.8 115 111 132.79 126.54 51.58 48.42 35 ... 172 185
    ANSI B18.2.3.5M - M90 × 6 92.48 88.6 130 125.5 150.11 143.07 57.74 54.26 39.2 ... 192 205
    ANSI B18.2.3.5M - M100 × 6 102.8 98.6 145 140 167.43 159.6 63.9 60.1 43.4 ... 212 225
    • a Basic thread length, B, is a reference dimension.
    • b Thissize with width across flats of 15 mm is not standard. Unless specifically ordered, M10 hex
    • bolts with 16 mm width across flats will be furnished.
    • All dimensions are in millimeters.

    Frequently Asked Questions

    What grades of nonferrous metal does ASTM F468 cover for metric hex bolts?

    ASTM F468 covers copper (C11000), brass (C26000, C27000, C46200, C46400), bronze (C51000 phosphor, C61300/C61400/C63000 aluminum, C64200, C65100/C65500/C66100 silicon, C67500 manganese), cupro-nickel (C71000, C71500), nickel-base alloys (N04400 Monel 400, N04405, N05500 Monel K-500, N06059 Alloy 59, N06625 Inconel 625, N06686, N10001 Hastelloy B-2, N10276 Hastelloy C-276), aluminum (A92024, A96061, A97075), and titanium (R50250 Gr 1, R50400 Gr 2, R50700 Gr 4, R56400 Gr 5, R56401 Gr 23 ELI, R52400 Gr 7, R58640 Gr 19, R55111 Gr 32) - all available for this product family at TorqBolt.

    What is the dimensional standard for these metric hex bolts?

    This product follows ASME B18.2 3 5M, the dimensional standard for metric hex bolts. Material chemistry, mechanical properties, and acceptance criteria follow ASTM F468 / F468M for nonferrous bolting. TorqBolt supplies both inch-series and metric sizes per the applicable ASME or ISO drawing.

    Which F468 grades are best for marine and seawater service?

    For seawater bolting per F468: Monel 400 (N04400) and Monel K-500 (N05500) resist chloride stress-corrosion cracking and HF acid; nickel-aluminum bronze C63000 is the standard high-strength marine fastener; cupro-nickel C71500 is preferred for condenser tube-sheet bolting; naval brass C46400 is the lower-cost option for routine marine hardware; titanium Grade 2 (R50400) is the premium choice for severe chloride + chemical service.

    Are F468 metric hex bolts NACE MR0175 acceptable for sour service?

    Most F468 nickel and titanium grades are NACE MR0175 / ISO 15156-listed: Monel 400 (N04400), Monel K-500 (N05500) conditional, Inconel 625 (N06625), Hastelloy B-2 (N10001), Hastelloy C-276 (N10276), Alloy 59 (N06059), Alloy 686 (N06686), and all titanium grades (R50400, R52400, R56400, R56401). Aluminum bronzes are generally not preferred for sour service. TorqBolt provides NACE-compliant heat-treat and hardness reports on request.

    References & Standards

    • ASTM F468 / F468M - Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use
    • ASTM F467 / F467M - Companion specification for Nonferrous Nuts (mate with F468 for matched-alloy assemblies)
    • ASTM F436 / F436M - Hardened steel washers (ferrous washer companion when nonferrous washers are not specified)
    • NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum and natural gas industries
    • ASME B18.2.1 / B18.2.3 series / B18.3 / B18.6.7M / B18.31 / B16.5 - Dimensional standards referenced by F468
    • DIN 912 / 933 / 931 - Metric hex socket head and hex head cap screw dimensional standards
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