Lockwood Synergy® 3542 Short Backset Mortice Hook Bolt Short backset, swing bolt deadlocks suitable for narrow stile hinged doors. Positive action deadbolt locked or unlocked by either key, turnknob, escape turn or handle. Suitable for heavy duty use in industrial and commercial buildings, institutions, clubs, schools, hospitals, hotels, retail and similar buildings. All 3542 Series Cylinder Mortice Locks are built of the finest materials, with the easy action and solid feel of the world's finest locks. Specification Materials High quality zinc alloy case Brass turnknobs and cylinder escutcheons Zinc die cast levers Backset23mm. BoltSintered stainless steel. Door Thickness Suits hollow stile door sections with 28mm internal thickness and 58mm maximum external thickness.Timber Doors: 32 to 58mm. Cylinder 5 pin tumbler mechanism Brass cylinders and brass barrels Keying Standard Keying Supplied individually keyed with two keys per lock 78,000 key combinations Key blank KB2015P Restricted Special Keying Lockwood locks can be keyed to a number of controlled and/or specially keyed systems. These range from legally protected keys to protect against unauthorised duplication, which can also include specially designed key systems such as master key systems, which allow for different levels of mechanical access control. Lockwood Keying Platforms - more information Standard Finish Satin Chrome Brushed SC Other finishes available on application. Close Downloads 3542-Step-240415.zip (.zip, 1.7 MB) Installation Instruction - 3540 Fabricator Fitting.pdf (.pdf, 1.2 MB) Installation Instruction - 3640 Metal Door Fitting.pdf (.pdf, 1.7 MB) Installation Instruction - 3740 Timber Door Fitting.pdf (.pdf, 774 kB) Lockwood Synergy Mortice Locks Catalogue.pdf (.pdf, 5.8 MB) Synergy 3540 DXF Drawing.zip (.zip, 230 kB) Close Where to buy? Find your local Lockwood stockist. Lockwood Synergy® 3571 Deadlock Mortice Locks60mm, 89mm or 127mm backset models available. Lockwood Synergy® 3579 Series Mortice Locks and Deadbolts60mm backset. Lockwood Synergy® 3578 Hold Back Deadlatches60mm, 89mm or 127mm backset models available.