Open out window restrictor

For use on PVCu, aluminium or timber windows

The unique Res-Lok open out concealed restrictor has been designed to provide safety for all major types of PVCu, aluminium and timber open out windows. The configuration will vary depending on the profile of window.

Features & Benefits

  • Automatic locking.
  • Automatic engagement.
  • Concealed fitting.
  • Restricts sash to 100mm opening.
  • Dedicated key release.
  • Retro fitting option.
  • Conforms to BS EN 14351:2006 Clause 4.8.
  • Constructed from stainless steel and zinc alloy.
  • Other stud sizes available.

Please note that it is the Duty-Holder's responsibility to specify the appropriate restrictor for each situation.

Res-Lok open out


Concealed Open Out Restrictor Product Code
Res-Lok kit 105mm* - LH JBC327-Kit
Res-Lok kit 105mm* - RH JBC328-Kit

 *Res-Lok kits include: Key, Restrictor, 11.5mm stud, 1mm and 2mm packer.


Res-Lok open out



Open out window restrictor

Manufactured From

Stainless steel.

Recommended Screws

4mm (No.8) Countersunk Head.

Note: All screws must be stainless steel.


Tested in accordance with BS EN 14351:2006 Clause 4.8

More information / 01206 713801