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    Self-Centering Bore Clamps (.62" to 1.81" Bores)

    Self-Centering Bore Clamps, B1.481 (15.9 to 46mm Bores)

    Power Workholding

    700 to 5000 psi max (depending on bore size)
    Double Acting
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types:
    Self-centering
    Self-centering in one axis, with .020" float in the other axis
    Without centering, with .020" float in all directions.
    Bore clamps are available in one housing diameter with five different cone sizes to cover five internal-diameter clamping ranges:
    15.9 to 21.9mm
    22 to 27.9mm
    28 to 33.9mm
    34 to 39.9mm
    40 to 46mm

    Segmented Clamping Bushings must be ordered separately and are available in 0.1mm increments. After mounting, the clamping bushing is concentric to the housing's bottom locating post within .003". Clamping repeatability is within .0002".

    Application Information

    These Bore Clamps exert force both radially and downward against a hardened support surface.
    Dual Mounting Capability Standard Fittings or Manifold Mounting.

    Clamping Action

    Self-Centering Bore Clamps are a combination of a double-acting pull-type cylinder and a segmented bushing which is pulled by a drawbar over a fixed cone. This causes the segmented bushing to expand radially to the bore diameter of the workpiece. The simultaneous axial movement forces the workpiece downward onto the hardened support surface of the housing. Downward clamping force is proportional to operating pressure and will vary somewhat depending on the friction coefficient within the bore.

    Design Considerations

    See Dimensions page for allowable bore tolerances and required contact length. Do not exceed the maximum operating pressure listed for the bore-diameter range or this will damage the drawbar. Avoid repeated clamping without the workpiece in place because this strains the vulcanized segment joints. The maximum operating temperature for the segmented bushing is 175°F.

    Mounting & Fluid Supply

    Mounting the Clamp:
    Bore a locating hole in the fixture plate for the housing's bottom locating the post. Fasten with four socket-head cap screws.
    Mounting & Adjustment of the Segmented Bushing:
    With the Bore Clamp unclamped and the drawbar's lock nut removed, screw the end plug of the Segmented Clamping Bushing onto the drawbar. Check the bushing's diameter with a caliper and continue turning until the diameter is .004 to .008" less than the clamping diameter, to allow easy loading of the workpiece. Secure with the lock nut.
    Fluid Supply:
    Two 1/4" BSPP ports, A for clamping, B for unclamping. For optional manifold mounting, use the A and B manifold ports underneath the clamp by unscrewing the sealing plugs and installing two CLR-3000-343-SW O-rings (also install two CLR-810-F Port Plugs in the 1/4" BSPP ports). Do not use NPT fittings. These clamps also have a 1/8" BSPP port marked M for air connection when using the pneumatic seat check.

    Material

    Body > Steel. Piston and workpiece support > Steel, case hardened. Segmented Clamping Bushing > Steel, case hardened, with vulcanized segment joints.

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    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 16 - 21.9 mm, W/ CENTRING FUNCTION, 50 bar CL-CLR-4317-100-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 16 - 21.9 mm, W/ COMPENSATION, 50 bar CL-CLR-4317-110-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 16 - 21.9 mm, W/O CENTRING, 50 bar CL-CLR-4317-120-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 22 - 27.9 mm, W/ CENTRING FUNCTION, 75 bar CL-CLR-4317-200-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 22 - 27.9 mm, W/ COMPENSATION, 75 bar CL-CLR-4317-210-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    BORE CLAMP, D.A., PULL-TYPE, CLAMPING RANGE 22 - 27.9 mm, W/O CENTRING, 75 bar CL-CLR-4317-220-VS

    Call for pricing
    Self-Centering Bore Clamps provide locating, internal clamping, and supporting in one unit, exerting force both radially and downward against a hardened support surface. This compact design uses an expanding Segmented Clamping Bushing to exert high clamping force with self-centering repeatability within .0002". These bore clamps are particularly suitable for clamping workpieces with machined bored holes and a support surface square to the hole axis. Available in three types: 1) Self-centering; 2) Self-centering in one axis, with .020" float in the other axis; 3) Without centering, with .020" float in all directions.

    Self-Centering Bore Clamps (.62" to 1.81" Bores)