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    2. API 6A Bolting Torque-Imperial

    API 6A Bolting Torque for Flanges (USC Units)

    Stud Diameter D in. Threads per in. N 1/in. Studs with Sy = 105 ksi
    Bolt Stress Equal to 52.5 ksi
    Tension F lbf Torque f = 0.07 ft-lbf Torque f = 0.13 ft-lbf
    0.500 13 7,450 35 59
    0.625 11 11,865 68 115
    0.750 10 17,559 118 200
    0.875 9 24,241 188 31 9
    1.000 8 31 ,802 279 474
    1.125 8 41,499 401 686
    1.250 8 52,484 553 953
    1.375 8 64,759 739 1281
    1.500 8 78,322 962 1677
    1.625 8 93,1 73 1226 21 46
    1.750 8 109,313 1534 2696
    1.875 8 126,741 1890 3332
    2.000 8 145,458 2297 4061
    2.250 8 186,758 3276 5822
    2.500 8 233,21 2 4500 8030
    2.625 8 - - -
    2.750 8 - - -
    3.000 8 - - -
    3.250 8 - - -
    3.750 8 - - -
    3.875 8 - - -
    4.000 8 - - -
    Specifications
    • ASTM A453
    • ASTM A638
    • EN 10269
    • EN 10083-3
    • ISO 3506-5
    • DIN 267
    Surface Treatments
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    • Xylar 2 / 101
    • SermaGard 1105 / 1280
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    • TakeCoat 1000 Ceramic
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