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|Lock Design||Pin-tumbler, Sidebar|
|Security Rating(s)||BS EN 1303:2005|
|# of Components||6|
|ASSA Twin 6000|
ASSA Twin Combi
ASSA Twin Exclusive
ASSA Twin Maximum
ASSA Twin Pro
The dp4400 is a BS EN 1303:2005 Security Grade 6 rated pin-tumbler lock made by ASSA. The dp4400 uses six pin-tumblers and a sidebar to provide two layers of security. The patented sidebar mechanism has a force-controlled sidecode function and false gate positions. The cylinder is drill resistant. The dp4400 was patented by inventor Bo G. Widén.
Principles of operation
- See also: Pin-tumbler (Principles of operation)
- "Pocket Catalogue" (pdf). ASSA. 2008. Retrieved 20 January 2023.