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    2. ASME B18.2.2 Hex Nuts

    ASME B18.2.2 Hex Nut Dimensions

    Standard hex nuts produced according to ASME B18.2.2 specifications for industrial fastening systems.

    ASME B18.2.2 Hex Nuts are widely used in commercial, industrial, and engineering applications requiring secure threaded fastening solutions. These standard hex nuts provide reliable mechanical performance, dimensional accuracy, and compatibility with bolts, screws, and industrial fastening assemblies used across multiple industries.

    ASME B18.2.2 Hex Nuts

    ASME B18.2.2 Hex Nuts Dimensions (Inch)

    Nominal Size Basic Major Diameter of Thread Width Across Flats, F Width Across Corners, G Thickness, H Maximum Runout of Bearing Surface
    to Thread Axis, FIM
    Min. Max Min. Max Min. Max Up to 150,000 psi 150,000 psi and Greater
    1/4 0.2500 0.428 0.438 0.488 0.505 0.212 0.226 0.015 0.010
    5/16 0.3125 0.489 0.500 0.557 0.577 0.258 0.273 0.016 0.011
    3/8 0.3750 0.551 0.563 0.628 0.650 0.320 0.337 0.017 0.012
    7/16 0.4375 0.675 0.688 0.768 0.794 0.365 0.385 0.018 0.013
    1/2 0.5000 0.736 0.750 0.840 0.866 0.427 0.448 0.019 0.014
    9/16 0.5625 0.861 0.875 0.982 1.010 0.473 0.496 0.020 0.015
    5/8 0.6250 0.922 0.938 1.051 1.083 0.535 0.559 0.021 0.016
    3/4 0.7500 1.088 1.125 1.240 1.299 0.617 0.665 0.023 0.018
    7/8 0.8750 1.269 1.312 1.447 1.516 0.724 0.776 0.025 0.020
    1 1.0000 1.450 1.500 1.653 1.732 0.831 0.887 0.027 0.022
    1 1/8 1.1250 1.631 1.688 1.859 1.949 0.939 0.999 0.030 0.025
    1 1/4 1.2500 1.812 1.875 2.066 2.165 1.030 1.094 0.033 0.028
    1 3/8 1.3750 1.994 2.062 2.273 2.382 1.138 1.206 0.036 0.031
    1 1/2 1.5000 2.175 2.250 2.480 2.598 1.245 1.317 0.039 0.034
    1 5/8 1.6250 2.35 2.43 2.679 2.805 1.364 1.416 0.044 0.038
    1 3/4 1.7500 2.538 2.625 2.893 3.031 1.460 1.540 0.048 0.041
    1 7/8 1.8750 2.722 2.813 3.103 3.247 1.567 1.651 0.051 0.044
    2 2.0000 2.900 3.000 3.306 3.464 1.675 1.763 0.055 0.047
    2 1/4 2.2500 3.263 3.375 3.719 3.897 1.890 1.986 0.061 0.052
    2 1/2 2.5000 3.625 3.750 4.133 4.330 2.105 2.209 0.068 0.058
    2 3/4 2.7500 3.988 4.125 4.546 4.763 2.319 2.431 0.074 0.064
    3 3.0000 4.350 4.500 4.959 5.196 2.534 2.654 0.081 0.070
    3 1/4 3.2500 4.713 4.875 5.373 5.629 2.749 2.877 0.087 0.075
    3 1/2 3.5000 5.075 5.250 5.786 6.062 2.964 3.100 0.094 0.081
    3 3/4 3.7500 5.438 5.625 6.199 6.495 3.178 3.322 0.100 0.087
    4 4.0000 5.800 6.000 6.612 6.928 3.393 3.545 0.107 0.093

    Frequently Asked Questions

    What grades of nonferrous metal does ASTM F467 cover for hex nuts?

    ASTM F467 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 grades - all available for this nut family at TorqBolt.

    What is the dimensional standard for these hex nuts?

    This product follows ASME B18.2 2, the dimensional standard for hex nuts. Material chemistry, mechanical properties, and acceptance criteria follow ASTM F467 / F467M for nonferrous bolting. TorqBolt supplies both inch-series and metric sizes per the applicable ASME or ISO drawing.

    Which F467 grades are best for marine and seawater service?

    For seawater bolting per F467: 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 F467 hex nuts NACE MR0175 acceptable for sour service?

    Most F467 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 F467 / F467M - Standard Specification for Nonferrous Nuts for General Use
    • ASTM F468 / F468M - Companion specification for Nonferrous Bolts, Hex Cap Screws, and Studs (mate with F467 nuts 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 B18.2.2 / B18.2.4.1M / B18.2.4.6M and ISO 4032 / 4033 / 4035 - Dimensional standards referenced by F467
    • DIN 934 / 439 / 6330 - Metric hex nut dimensional standards
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