A diamond locating pin is used in jigs and fixtures because

Concept:

• The diamond shape is a critical feature that helps with machining inaccuracies and smoother locating operations.
• When two round headpins are installed onto one plate, the distance between two mounting holes must be extremely precise and even then, the workpiece will not be placed on the base as easily as it would with the use of a diamond-shaped pin.
• Diamond pin location is used in fixtures because it takes care of any variation in the center distance between two holes.