(Keyless Bushing)

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A.P. Lock (Keyless Bushing) is a power transmission component that
enables to clamp shaft and hubs (i.e. pulley, gear etc.) simultaneously
through its surface pressure. S.I.M provides diverse options in regards
to size, body material and surface treatment.

  • Selection and Design Guide
    (SAPL-A, B,C, D1, D2, D3, D4, T Series)

HOW TO INSTALL (SAPL-A, B,C, D1, D2, D3, D4, T Series)

HOW TO INSTALL (SAPL-A, B,C, D1, D2, D3, D4, T Series)
  1. Wipe inner surface of shaft and hub to remove dust and oil.
  2. Wipe inner and outer surface of A.P. Lock.
  3. Spread anti-wear hydraulic oil or grease on to inner surface of shaft and hub.

    (Any oil type which includes molybdenum-sulfur compounds or silicone is prohibited.)

  4. Unfasten all screws and spread hydraulic oil #68 onto A.P. Lock body and taper-ring surface.

    (Make sure oil is not in use under vacuum environment. In this case, clamping force may be subject to change from catalog values.)

  5. Interlock an A.P. Lock with shaft temporarily and insert it into the hub.
    • Make sure the corner of hub becomes properly attached to A.P. Lock’s flange part.
    • Determine the relative location of shaft and hub.
    • Make sure there is bigger than 1mm of clearance between shaft-end and hub. (Otherwise, there will be problem in disassembling and it may result in shape distortion.)
    • In case A.P. Lock doesn’t go into hub smoothly, try to loosen fastening screws or tapping them into hub slightly. (Make sure the force is not too strong.)
    SAPL-A Series (Example)
    SAPL-B Series (Example)
    SAPL-C Series (Example)
    SAPL-T Series (Example)
    SAPL-D1 Series (Example)
    SAPL-D2 Series (Example)
    SAPL-D3 Series (Example)
    SAPL-D4 Series (Example)
  6. Fasten the screws with appropriate fastening torque in sequential order as shown on the below figure.
    • Fasten the screws with identical torque ⅛ of fastening torque) using torque wrench.
    • Make sure you fasten the screws in sequential order as shown on the above figure.
    • Make sure A.P. Lock’s flange part becomes properly attached to hub.
    • Repeat fastening the screws with ¼ of fastening torque. (in diagonal order)
    • Repeat fastening the screws with ½ of fastening torque. (in diagonal order)
    • Finally repeat fastening the screws with full fastening torque until screws don’t rotate any longer.