British Standards Document
BS 8621
Lock assemblies operated by key from the outside of the door and by handle or thumb turn from the inside of the door

https://doi.org/10.3403/30338193U

BS 8621 is maintained by B/538/4. The current release of this standard is:

BS 8621:2017+A1:2024 Lock assemblies operated by key from the outside of the door and by handle or thumb turn from the inside of the door

https://doi.org/10.3403/30338193 (published 08/06/2017)

This standard is available from the following sources:

Other historical versions of this standard document also exist: