AP4 S cylinder

CISA AP4 S cylinders are the ideal solution for anyone who needs a high performance cylinder.

High protection and controlled duplication, as keys can only be duplicated by CISA Solution Partners  and CISA

+ 40% resistance to pulling and tearing, thanks to the Snap Resistant feature, a dual-material steel core.

High resistance to bumping (percussion), thanks to the Bump Key Power (BKP) patented device.

High resistance to picking (tampering), thanks to the patented technology with floating drivers.

Shape trademark registered on the key to protect AP4 S and AP3 S key duplication over time, also guarantees compatibility with the previous version of the AP3 S cylinder.



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  • Attack resistance
    Resistance against tearing and pulling: dual-material segment pack in hardened steel and stainless steel central segment visible from the outside on both sides of the cylinder
  • BKP PATENT PCT/WO2007/074163A1. Certified protection against bumping, thanks to BKP (Bump Key Power) patented technology
  • Patent PCT/IT2016/000093. High resistance to picking, thanks to the system with new floating drivers.
  • Certified drill resistance, thanks to the key bitting system in hardened steel.
  • High resistance to forced entry using the impression or wax technique, thanks to the special configuration of the springs.


  • 12-pin key-bitting system (6 active, 5 passive, 1 patented pin).
  • Brass body with segment pack along the whole length of the cylinder (excluding single cylinder, various cylinders and rim cylinders).
  • Brass plugs.
  • Clutch-type cam in self-lubricating sintered DIN steel.
  • Hardened steel pins and drivers.
  • Phosphor bronze and steel springs.
  • 100,000 cycles (in compliance with EN 1303: 2015 Durability: 6).




  • Key Related Security
  • PATENT PCT/IT2013/000297-AP4 Protected key duplication, thanks to AP4 System technology, keys can only be duplicated at CISA Solution Partners or CISA
  • 3D trademark: No. 1276648 
  • Greater control over key cloning, thanks to the protected mobile element, providing unlimited protection over time.
  • Security Card with authorised key duplication only at CISA Solution Partners and CISA.
  • 11-pin key bitting system on 3 rows.
  • Offers excellent access management potential.
  •  E.g. 132,000 different cylinders with one master key


  • Flat reversible.
  • In nickel silver alloy.
  • Numerical code on key bow.
  • Key thickness 2.9 mm.
  • Depth 0.48 mm.
  • Compatible with protective roses
  • Key bow can be personalised with an insert available in 15 different colours.


  • 3 keys
  • Security Card
  • Fixing screws
  • Operating and maintenance instructions


  • Nickel-plated satin brass. Standard (fin. 12)
  • Polished brass. On request (fin. 66).


  • In compliance with EN1303:15
    Key Related Security: 6
    Attack Resistance: D
    Durability: 6
  • For armoured doors classified from 4 to 6 according to standard


AP4 S cylinder:

  • PCT/WO2007/074163
  • PCT/IT2016/000093
  • PCT/IT2013/000297


One Key AP4 S key protected by:

  • 3D trademark No. 1276648


AP4 S instructions

AP4 S brochure