Moore & Wright Firm Joint Outside Caliper - 300mm

A 'firm joint' means the caliper's legs are held in place by a friction nut and screw mechanism that resists movement, ensuring the caliper stays set to a measurement without slipping during use.

The listed size (300mm) is the effective leg length. The total measuring capacity is generally about one-third greater than the effective leg length due to the geometry of the caliper legs.

No, these are 'outside calipers' designed specifically for measuring external dimensions. Moore & Wright also offers inside calipers for internal measurements.

Wipe the calipers with a soft, dry cloth after use. For stubborn marks, use a lightly dampened cloth and ensure the tool is dried thoroughly. A light application of oil can prevent rust on the steel surfaces, especially in humid environments.

BS3123 is a British Standard that specifies requirements for the design, dimensions, and performance of calipers, ensuring a certain level of quality and usability.

Yes, the firmness of the joint can be adjusted by tightening or loosening the large headed nut and screw assembly.

Gently tighten the screw assembly using a small screwdriver or appropriate tool. Avoid overtightening, which can make adjustment difficult.

Ensure the threads on the screw and nut are clean and free of debris. Slightly loosen the main nut if it feels overly tight, then re-adjust for a firmer hold.

Ensure the caliper legs are clean and free from burrs or damage. Verify the caliper is being used correctly on the external surface to be measured. Always ensure the joint is set firmly.