Historical
ANSI B94.29.1-1977 (R2000)
Die-Buttons - Basic Ball-Lock (Metric)
This standard covers the American National Standard practice for basic metric ball-lock die buttons including dimensions, tolerances, nomenclature, sizes and shapes. Ball-lock interchangeable die buttons are standard with round, oblong, square and rectangular holes for up to 25 mm diameter maximum pierced hole size. They fit in light duty ball-lock retainers and are gaged for locking interchangeability with light duty functional gages.
American Society of Mechanical Engineers [asme]