Clamping Knobs

UNILOCK clamping knobs can be attached to fixtures or directly to workpieces. Our standard knobs can be mounted in a blind hole from the bottom or pulled up from the top. Standard clamping knobs accept the following:

Option 1 – Pass-Through Bolt – The bolt is inserted past the clamping knob and threads into the workpiece or fixture.

Option 2 – Captive Set Screw – The set screw is captivated between the knob and the workpiece or fixture.
(Note: This option is not recommended for “B” type knobs as there is no timing control)

Option 3 – Retain From Top – The bolt passes through the workpiece or fixture and pulls the knob into position.

Knob Options Figure

Option 2 not recommended for B Type

Standard clamping knobs have a metric positioning boss which is Ø 25 mm and ground to a fit of h6. This boss is 5 mm tall. The overall measurements of the clamping knob are Ø 40 by 40 mm tall.

Features & Benefits

SBA Knob orientation The SBA Knob is ground to fit with the center ground taper of the chuck. This fit establishes the centerline location. This location will repeat to better than +/- .0002".

SBA Knob orientation The SBB Knob is ground like a diamond pin and orients your work relative to the centerline of the SBA knob.

SBA Knob orientation The SBC Knob is ground undersize. It will bring the bottom of the workpiece or fixture down on the top of the Unilock chuck.