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    2. ASTM A453 Grade 660 Class B
    3. 12 Point Lock Nuts

    ASTM A453 Grade 660 Class B 12 Point Lock Nuts

    Marked A2A Drawing No.C2F10A1

    ASTM A453 Grade 660 Class B twelve point Lock Nuts
    DESCRIPTION: (C2F10A1) External wrenchin , 12-point double hex lock nut.
    MATERIAL: Precipitation hardening nickel chromium steel, UNS S66286, conforming to ASTM A453 Grade 660, Class A.
    HARDNESS :BRINELL 248 - 341 HB.
    SURFACE TEXTURE: All Surface 63 microinch.
    HEAD MARKING: A2A stamped on slde of nut.
    FOR USE IN TEMPERATURE UP TO 1000 oF
    All dimensions are in inches unless otherwise indicated

    ASTM A453 Grade 660 Class B 12 Point Lock Nuts

    Hardenable Nickel-Chromium 12-Point Lock Nut

    THREADS PER INCH THREAD SIZE PART NO. A B C H P S V W
    max min min max max min min max min
    16 UNC 3/8 (0.375) 25 0.649 0.609 0.491 0.350 0.405 0.148 0.064 0.439 0.430
    13 UNC 1/2 (0.500) 29 0.828 0.788 0.631 0.506 0.530 0.239 0.099 0.564 0.553
    11 UNC 5/8 (0.625) 33 1.050 1.010 0.846 0.586 0.660 0.308 0.099 0.752 0.741
    10 UNC 3/4 (0.750) 35 1.230 1.190 0.987 0.706 0.785 0.378 0.124 0.877 0.865
    9 UNC 7/8 (0.875) 37 1.430 1.390 1.129 0.850 0.910 0.445 0.150 1.002 0.990
    8 UNC 1 (1.000) 39 1.625 1.595 1.271 0.970 1.035 0.516 0.177 1.127 1.115
    8 UN 1 1/8 (1.125) 41 1.840 1.800 1.480 1.125 1.160 0.600 0.197 1.314 1.298
    8 UN 1 1/4 (1.250) 44 2.125 2.085 1.628 1.260 1.285 0.681 0.217 1.440 1.427
    8 UN 1 3/8 (1.375) 47 2.250 2.210 1.766 1435 1.410 0.789 0.257 1.565 1.549
    8 UN 1 1/2 (1.500) 50 2.500 2.460 1.914 1.610 1.535 0.897 0.297 1.690 1.677
    8 UN 1 5/8 (1.625) 98 2.660 2.620 2.122 1.865 1.660 0.875 0.315 1.877 1.861
    8 U N 1 3/4 (1.750l) 52 2.815 2.765 2.339 2.120 1.785 0.830 0.330 2.064 2.050
    8 UN 2 (2.000) 54 3.160 3.110 2.697 2.350 2.035 1.045 0.389 2.377 2.363
    8 UN 2 1/4 (2.250) 56 3.696 3.656 3.053 2.734 2.285 1.409 0.400 2.690 2.675
    8 UN 2 1/2 (2.500) 58 4.060 4.020 3.338 3.038 2.535 1.610 0.425 2.940 2.925
    Specifications
    • ASTM A453
    • ASTM A638
    • EN 10269
    • EN 10083-3
    • ISO 3506-5
    • DIN 267
    Surface Treatments
    • Xylan 1070 / 1014 / 1400 / 1424
    • Xylar 2 / 101
    • SermaGard 1105 / 1280
    • Dacromet 320 / 500
    • TakeCoat 1000 Ceramic
    • Magnigard
    • MolyKote
    Certifications
    • ISO 9001 - 2015 Certified
    • PED 2014/68/EC
    • NACE MR0175/ISO 15156-2
    • NORSOK M-650
    • DFAR
    • MERKBLATT AD 2000 W2/W7/W10
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