Lockwood 355 Deadlock

Suitable for hinged or sliding doors, the 355 double cylinder deadlock features a lockable turnknob with a inbuilt clutching device to resist wrench attack.


  • the turnknob is interlocked to resist hammer attack
  • features a strong interlocking case and mounting plate to resist jemmy attack
  • offers concealed fixing
  • has a positive deadlocking action
  • outside function: opened by key
  • inside function: opened by turnknob from inside when free. Key inside locks or unlocks turnknob
  • body dimensions 121mm W x 76mm H x 56mm T
  • case thick walled high purity zinc alloy
  • backset 60mm
  • bolt made of solid steel & solid steel boot leg
  • suitable for door thickness of 30mm - 45mm
  •  cylinder 5 pin inside and outside
  • suits C4 key
  • finishes available include satin chrome, chrome plate, brown & gold plated