145mm SC. The ADAMS RITE 6201-6-12 Flat Flush Bolt is used to secure the slave leaf of a pair of doors and are suitable for use on aluminium doors. It features a zinc-plated hardened steel bolt with an anti-rattle sleeve, and the operating lever is hidden when the doors are closed. A standard installation requires 2 flushbolts, morticed into the top and bottom of the door.. Die cast zinc alloy body mechanism. Hardened steel bolt, zinc plated with an anti rattle sleeve. 18mm bolt throw. 7mm zinc plated steel rod, 40mm thread length