Additional window lock FOS550

Universal linkage: You can secure your patio doors and double casement windows reliably with this window bar lock.
  • Protects the full height of windows and patio doors
  • Easy operation via the window handle – window closed, lock secured!
  • Slim design, ideal for tight installation spaces

Additional window lock FOS550


Window bar lock, security for patio doors and double casement windows.

Narrowly constructed, quickly mounted: Secure your patio and double doors with this bar lock. The two strong securing points secure at the top and bottom. The lock withstands a pressure of over one tonne at both points. The additional window lock is operated by means of a lockable window handle: If the window is closed, the locking bars are also extended.


  • VdS and DIN-certified
  • Resists more than one ton static load per securing point
  • Two locking points (top and bottom)
  • The system and the window is locked by the window handle
  • Appropriate bar sets have to be ordered separately
  • Incl. two keys

Operation and use:

  • Two-point locking for inward opening windows and patio doors
  • Modular construction system up to 3.10 m, if handle is centred on the frame
  • Also for double windows with or without a rebate, with 7 mm square bolt
  • Dead bolting with quality push-button cylinder
  • Unlocking with the key only necessary after dead bolting
  • Can be supplied keyed alike with a variety of other ABUS products
  • Suitable for all surface materials, such as wood, PVC and aluminium
  • Universal DIN-right and DIN-left mounting


  • Finishes: B, W
  • Length of bars: 75 cm / 118 cm / 150 cm
  • Accessories: Floor strike plate BSB550, strike plate for double casement windows DSB550 B/W, ground socket BH550
  • Alarmed version also available
Additional window lock FOS550 B kd. 
Art. no. 11922

Level: 10
Packaging: individual box
Weight: 1462 g
Additional window lock FOS550 W kd. 
Art. no. 11911

Level: 10
Packaging: individual box
Weight: 1470 g
Additional window lock FOS550 S kd. 
Art. no. 71241

Packaging: individual box
Weight: 1470 g

Questions & answers

Security glossary