Northfield Precision has been the leading manufacturer of precision air chucks, diaphragm chucks, collet chucks and accessories for over 57 years.. Northfield’s chucks are the most accurate in the world with a guaranteed accuracy from 0.0001″ (2.5µ) to 0.000010″ (0.25µ) for all standard chucks. The combination of our knowledgeable engineering team and experienced manufacturing staff enables us to provide unparalleled precision.