We use cookies to improve your experience on this website. Read More Allow Cookies

The XT66 High Specification Casement Window System has been developed to enhance the performance and energy efficiency of our window suites. It is an eco-friendly, sustainable, fully certified, patented aluminium windows system. Measuring 66mm in depth. It can be glazed both internally or externally with 28 mm through to 48 mm units with a range of sash styles. The XT66 is fully compatible and interchangeable with the TS66 and XTC66 window systems.

The system has been tested to BS 6375 - 1 & 2 and security tested to PAS 24. It has excelled in all testing categories. The XT66 has unique patented technology which offers U-Values as low as 0.92 W/ m²K. This system also boasts a heavy duty, category 3 status (20,000 cycles), for repeated opening and closing.


Get a price / quote

Features and Finishes







Get a price / quote


  • Tested to BS 6375 - 1: 2015 + A1 2016 and BS 6375 - 2: 2009
  • Air Tightness = Class 4: 600 Pa
  • Water Tightness = Class E900 (900 Pa)
  • Wind Resistance = 2400 (Class E2400A)


  • Tested to PAS24: 2016 for Security




  • Resistance to racking and static torsion = Class 3
  • Resistance to repeated opening and closing = Class 3 (20K Cycles)
  • Operating forces = Class 1


Get a price / quote
  • XT66 Casement Brochure Click HERE
  • XT66 Casement Shadow Line Option Click HERE
  • BIM Store Models Click HERE
  • SpecifiedBy Click HERE
  • AMS Member Area Click HERE
Get a price / quote

Related Projects

At AMS we are always committed to producing systems that are sustainable, high performing with long design life therefore minimising impact on the environment.

Do you have a project?

Make an enquiry

By clicking this button you agree to our Privacy Policy and Terms & Conditions