BS 4377:1991
Specification for tapping of holes to receive wire thread inserts (ISO metric threads)
https://doi.org/10.3403/00240411 (published 31/05/1991)
BS 4377:1991 is maintained by FME/9. This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS 4377:1980 [current until 31/05/1991]