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    API 6A Bolting Torque for Flanges (SI Units)

    Stud Diameter D in. Threads per in. N 1/in. Studs with Sy = 720 MPa
    Bolt Stress Equal to 360 MPa
    Tension F kN Torque f = 0.07 N-m Torque f = 0.13 N-m
    0.500 13 33 48 80
    0.625 11 53 92 155
    0.750 10 78 160 270
    0.875 9 107 253 429
    1.000 8 141 376 639
    1.125 8 184 540 925
    1.250 8 232 745 1285
    1.375 8 286 996 1727
    1.500 8 346 1297 2261
    1.625 8 41 2 1653 2894
    1.750 8 484 2069 3636
    1.875 8 561 2549 4493
    2.000 8 644 3097 5476
    2.250 8 826 4418 7851
    2.500 8 1032 6068 10,828
    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
    • 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