British Standards Document
BS 3621
Lock assemblies operated by key from both the inside and outside of the door
https://doi.org/10.3403/30338191U
BS 3621 is maintained by B/538/4. The current release of this standard is:
BS 3621:2017 Lock assemblies operated by key from both the inside and outside of the door
https://doi.org/10.3403/30338191 (published 08/06/2017)
This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS 3621:2007+A2:2012 [current until 08/06/2017]
- BS 3621:2007+A1:2009 [current until 31/05/2012]
- BS 3621:2004 [current until 10/08/2007]
- BS 3621:1998 [current until 06/12/2004]
- BS 3621:1980 [current until 15/09/1998]