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Thread: 66 Sportster front axle clamp bolt torque spec.?

  1. 66 Sportster front axle clamp bolt torque spec.?

    Does anyone know what the torque spec. is for 57-72 front axle clamp bolt. I's not in the factory manual!? Thanks
    Last edited by pheel; 10-11-2018 at 07:27 AM.

  2. #2

    Re: 66 Sportster front axle clamp bolt torque spec.?

    Torque specs would be the same as a bolt/nut the same size & thread pitch as on a newer machine

  3. Re: 66 Sportster front axle clamp bolt torque spec.?

    They changed the fork slider and axle clamping method in '73....So use a torque table to figure? What SAE grade was the '66 front axle pinch bolt?

  4. #4

    Re: 66 Sportster front axle clamp bolt torque spec.?

    I go by Robbie's theory on old bike torques...they did not have specs & i don't use a torque wrench on them.But 50 years experience at tightening & loosening bolts helps!

  5. #5

    Re: 66 Sportster front axle clamp bolt torque spec.?

    Does anyone know what the torque spec. is for 57-72 front axle clamp bolt. I's not in the factory manual!?
    GRADE 5
    Coarse Thread
    1/4-20 (.250) 8
    5/16-18 (.3125) 17
    3/8-16 (.375) 31
    7/16-14 (.4375) 50

    GRADE 5
    Fine Thread
    1/4-28 (.250) 10
    5/16-24 (.3125) 19
    3/8-24 (.375) 35
    7/16-20 (.4375) 55

    Xx
    GRADE 8
    Coarse Thread
    1/4-20 (.250) 12
    5/16-18 (.3125) 25
    3/8-16 (.375) 44
    7/16-14 (.4375) 70


    Xx
    GRADE 8
    Fine Thread
    1/4-28 (.250) 14
    5/16-24 (.3125) 27
    3/8-24 (.375) 49
    7/16-20 (.4375) 78
    Last edited by 1950panhead; 10-12-2018 at 09:37 AM.

  6. Re: 66 Sportster front axle clamp bolt torque spec.?

    Someone over tightened the orig. bolt and actually put a bend in it.
    I guess I'll replace it with a grade 5 and torque it to around 30 ft lb. The original is marked "1038 CP" on the head and the nut is unique with a taper on one face like a lug nut.
    Anyone know where I might find an original or repro bolt and nut?
    Thanks
    Last edited by pheel; 10-13-2018 at 11:11 AM. Reason: additional info

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