Theses unequal hexagon fixture clamps can minimise the cost of clamping in fixtures. The clamping range can be altered up to 17 mm from the same tapped hole. Simply rotate the hexagon washer.

Cam screw steel tempered to 10.9.
Hexagon washer mild steel.

Cam screw black oxidised.
Hexagon washer hardened and black oxidised.

The washers are available with smooth edges for machined faces or with serrated edges for rough faces.
The ”distance A” is set by simply turning the hexagonal clamp, the 6 edges of which have a distance to the centre of the screw that differs by 1 mm in each case.

Replacement cam screws.