ASSA dp4400

=ASSA dp4400=

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)