Internal Collars

Internal collars, sometimes referred to as bushings, are used to reduce the inside diameter of the center pipe of a screw to match standard CEMA shaft sizes and to increase the torque rating of the CEMA bolted connection.

KWS and Martin Part Numbers Cross Reference »
  • Model
    Number
  • Inside
    Pipe Dia.
  • A - Bore
    Dimension Min.
  • A - Bore
    Dimension Max.
  • B - Spacing
    1st Bolt
  • C - Bolt
    Centers
  • D - Nominal
    Bolt Size
    • IC111440

    • 1 1/4”
    • 1.005”
    • 1.016”
    • 1/2”
    • 2”
    • 3/8”
    • IC112240

    • 2”
    • 1.505”
    • 1.516”
    • 7/8”
    • 3”
    • 1/2”
    • IC221240

    • 2 1/2”
    • 2.005”
    • 2.016”
    • 7/8”
    • 3”
    • 5/8”
    • IC2716340

    • 3”
    • 2.443”
    • 2.458”
    • 15/16”
    • 3”
    • 5/8”
    • IC331240

    • 3 1/2”
    • 3.005”
    • 3.025”
    • 1”
    • 3”
    • 3/4”
    • IC3440

    • 4”
    • 3.005”
    • 3.025”
    • 1”
    • 3”
    • 3/4”
    • IC3716440

    • 4”
    • 3.443”
    • 3.467”
    • 1-1/2”
    • 4”
    • 7/8”