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.

Internal Collars
Dimensional Drawing for Internal Collars
  • Model
    Number
  • Inside
    Pipe Dia.
  • A - Bore
    Dimension Min.
  • A - Bore
    Dimension Max.
  • B - Spacing
    1st Bolt
  • C - Bolt
    Centers
  • D - Nominal
    Bolt Size
  • 3D Cad

    • IC111440
    • Inside Pipe Diameter: 1 1/4"
    • A - Bore Dimension Min.: 1.005"
    • A - Bore Dimension Max.: 1.016"
    • B - Spacing 1st Bolt: 1/2"
    • C - Bolt Centers: 2"
    • D - Nominal Bolt Size: 3/8"

    • IC112240
    • Inside Pipe Diameter: 2"
    • A - Bore Dimension Min.: 1.505"
    • A - Bore Dimension Max.: 1.516"
    • B - Spacing 1st Bolt: 7/8"
    • C - Bolt Centers: 3"
    • D - Nominal Bolt Size: 1/2"

    • IC221240
    • Inside Pipe Diameter: 2 1/2"
    • A - Bore Dimension Min.: 2.005"
    • A - Bore Dimension Max.: 2.016"
    • B - Spacing 1st Bolt: 7/8"
    • C - Bolt Centers: 3"
    • D - Nominal Bolt Size: 5/8"

    • IC2716340
    • Inside Pipe Diameter: 3"
    • A - Bore Dimension Min.: 2.443"
    • A - Bore Dimension Max.: 2.458"
    • B - Spacing 1st Bolt: 15/16"
    • C - Bolt Centers: 3"
    • D - Nominal Bolt Size: 5/8"

    • IC331240
    • Inside Pipe Diameter: 3 1/2"
    • A - Bore Dimension Min.: 3.005"
    • A - Bore Dimension Max.: 3.025"
    • B - Spacing 1st Bolt: 1"
    • C - Bolt Centers: 3"
    • D - Nominal Bolt Size: 3/4"

    • IC3440
    • Inside Pipe Diameter: 4"
    • A - Bore Dimension Min.: 3.005"
    • A - Bore Dimension Max.: 3.025"
    • B - Spacing 1st Bolt: 1"
    • C - Bolt Centers: 3"
    • D - Nominal Bolt Size: 3/4"

    • IC3716440
    • Inside Pipe Diameter: 4"
    • A - Bore Dimension Min.: 3.443"
    • A - Bore Dimension Max.: 3.467"
    • B - Spacing 1st Bolt: 1-1/2"
    • C - Bolt Centers: 4"
    • D - Nominal Bolt Size: 7/8"