BS 21:1909
Pipe threads for iron or steel pipes and tubes
https://doi.org/10.3403/30304878 (published 01/11/1909)
BS 21:1909 is maintained by . This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS 21:1985 [current until 30/04/2016]
- BS 21:1973 [current until 30/09/1985]
- BS 21:1938 [current until 31/12/1957]
- BS 21:1905 [current until 01/11/1909]