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    2. ASME B18.2.3.5M Metric Hex Bolts

    ASME B18.2.3.5M Metric Hex Bolts

    Standard metric hexagonal bolts serving as the universal fastener for general construction, manufacturing, and maintenance tasks.

    ASME B18.2.3.5M Metric Hex Bolts are the standard metric fasteners used across a vast array of industries for general-purpose assembly and construction. Characterized by a hexagonal head and a partially or fully threaded shank, these bolts are designed to be used with nuts or in tapped holes. Unlike cap screws, standard hex bolts may have slightly looser tolerances on the body diameter and head dimensions, making them cost-effective for applications where extreme precision is not critical. They are ubiquitous in everything from furniture assembly and automotive repair to light structural framing and machinery maintenance. The ASME B18.2.3.5M standard ensures that these bolts adhere to consistent metric dimensions (ISO 4014/4017 equivalents), allowing for easy sourcing and interchangeability in global markets. Their versatility and availability in numerous materials and finishes make them a staple in any hardware inventory.

    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
    M5 × 0.8 5.48 4.52 8 7.64 9.24 8.63 3.58 3.35 2.4 16 22 35
    M6 × 1 6.19 5.52 10 9.64 11.55 10.89 4.38 3.55 2.8 18 24 37
    M8 × 1.25 8.58 7.42 13 12.57 15.01 14.2 5.68 5.1 3.7 22 28 41
    M10 × 1.5 10.58 9.42 15 14.57 17.32 16.46 6.85 6.17 4.5 26 32 45
    M10 × 1.5 10.58 9.42 16 15.57 18.48 17.59 6.85 6.17 4.5 26 32 45
    M12 × 1.75 12.7 11.3 18 17.57 20.78 19.85 7.95 7.24 5.2 30 36 49
    M14 × 2 14.7 13.3 21 20.16 24.25 22.78 9.25 8.51 6.2 34 40 53
    M16 × 2 16.7 15.3 24 23.16 27.71 26.17 10.75 9.68 7 38 44 57
    M20 × 2.5 20.84 19.16 30 29.16 34.64 32.95 13.4 12.12 8.8 46 52 65
    M24 × 3 24.84 23.16 36 35 41.57 39.55 15.9 14.56 10.5 54 60 73
    M30 × 3.5 30.84 29.16 46 45 53.12 50.55 19.75 17.92 13.1 66 72 85
    M36 × 4 37 35 55 53.8 63.51 60.79 23.55 21.72 15.8 78 84 97
    M42 × 4.5 43 41 65 62.9 75.06 71.71 27.05 25.03 18.2 90 96 109
    M48 × 5 49 47 75 72.6 86.6 82.76 31.07 28.93 21 102 108 121
    M56 × 5.5 57.2 54.8 85 82.2 98.15 93.71 36.2 33.8 24.5 ... 124 137
    M64 × 6 65.52 62.8 95 91.8 109.7 104.65 41.32 38.68 28 ... 140 153
    M72 × 6 73.84 70.8 105 101.4 121.24 115.6 46.45 43.55 31.5 ... 156 169
    M80 × 6 82.16 78.8 115 111 132.79 126.54 51.58 48.42 35 ... 172 185
    M90 × 6 92.48 88.6 130 125.5 150.11 143.07 57.74 54.26 39.2 ... 192 205
    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 does ASME B18.2.3.5M metric hex bolts cover?
    ASME B18.2.3.5M is the metric dimensional standard for metric hex bolts. It defines head dimensions, body diameter, thread length, total length, drive recess, and tolerances so any compliant metric hex bolts interchanges with standard nuts, washers and wrenches across manufacturers.
    What size range is available for metric hex bolts under ASME B18.2.3.5M?
    metric hex bolts under ASME B18.2.3.5M covers M5 through M48 nominal diameter. TorqBolt manufactures the full range in ASTM A193 Grades B7, B7M, B8, B8M and the full ASTM A320 cryogenic counterpart on customer specification.
    What is the metric/inch counterpart of ASME B18.2.3.5M metric hex bolts?
    The companion specification for metric hex bolts is ASME B18.2.1 inch hex bolts (ISO 4017 equivalent in standard series). Both standards share equivalent functional dimensions but use the corresponding measurement system (inch vs metric ISO M-series).
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