What are the types of threads ?
Thread type | Intended use | Distribution in countries |
Metric standard thread | General use in industry and mechanical engineering | Europe, Japan, Australia |
Unified National Coarse (UNC) | General use in industry and mechanical engineering | USA, Canada |
Unified National Fine (UNF) | Fine thread for applications where higher strength is required | USA, Canada |
Whitworth thread | General use in industry and engineering | Great Britain, some former British colonies |
BSPT thread | For pipe fittings and lines | Great Britain, Europe, Asia |
BSPP thread | For pipe fittings and lines | Great Britain, Europe, Asia |
NPT thread | For tube fittings and lines | USA |
NPTF thread | For tube fittings and lines where a higher seal is required | USA |
BSW thread | General use in industry and engineering | Great Britain, some former British colonies |
It is important to note that there are many other thread types used in different industries and applications. This table contains only the most common thread types and their distribution in some selected countries
