Trade Standards For Fasteners:
( MM )
The millimetre is a unit of length in the metric system, equivalent to one thousandth of a metre.
British Standard With worth
( BSW )
British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard.
British Standard Fine
( BSF )
British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread.
( BA )
British Association screw threads, or BA screw threads, are a largely obsolete set of small screw threads, the largest being 0BA at 6 mm diameter.
Unified National Coarse
( UNC )
The Unified Thread Standard (UTS) defines a standard thread form and series—along with allowances, tolerances, and designations.
Unified National Fine
( UNF )
Unified fine thread, the fine thread series of the Unified Thread Standard UniFirst, a supplier of uniforms and protective clothing United.
( DIN )
ISO and ASTM International unveiled a framework for creating global additive manufacturing standards.