I-tec Locking


The innovative locking is the first real revolution in hardware systems since introducing the turn/tilt hardware at the beginning of the 1970‘s. For many years Internorm has been using concealed hinges as standard.

I-tec Locking example1Additionally, Internorm is applying the same principle to the window frame – no visible hardware.

I-tec locking is currently used with the home pure UPVC & UPVC/aluminium window KF 500 and is revolutionary in more than one aspect: No visible locking parts on the frame are necessary – instead of protruding locking pegs, integrated flaps ensure the safe locking of the sash. The connections of the locking flaps are carried out invisibly in the hollow chambers of the sash profile.

Convenient cleaning

Cleaning of the frame is made easier as there are hardly any locking parts. The few parts on the sash hardly protrude and in between the parts is the smooth, easy to clean UPVC surface of the profile.

Security which convinces

Windows with I-tec locking comply already in their standard version with resistance class RC2N (with lockable handle and burglary resistant glass RC2) acc. to EN 1627-1630 – as standard tested burglary protection.

I-tec Locking example2Perfect stability and sophisticated design

The ingenious construction enables 30 % less wide view widths. Generous window sizes and energy saving triple glazing require heavy sash versions. The window is held by a four-joint hinge at the bottom and a stay-arm hinge at the top. The new construction of hinge parts allows sash weights of up to 130 kg in compact design.

Advantages at a glance:

  • 30 % less wide view widths of frame and sash
  • RC2N as standard without functioning restrictions
  • Trendsetting thermal insulation as standard Uw < 0.69 W/m²K