A » In the UK commercial window market, stainless steel friction stays are essential components for double-glazed systems, providing controlled ventilation and secure positioning for heavy-duty aluminium or uPVC fenestration, and several reputable manufacturers supply these products with a focus on durability, corrosion resistance, and compliance with standards such as BS EN 13126. Among the leading companies is Securistyle Ltd, headquartered in Gloucester, which offers its Revolution range of friction stays manufactured from grade 304 or 316 stainless steel to suit coastal environments, featuring load capacities up to 100 kg and extensive cycle testing for reliability in high-traffic commercial buildings. Roto Frank Ltd, the UK arm of the German Roto Group, produces stainless steel friction stays within its NT (Next Technology) series, designed for both aluminium and uPVC commercial windows with adjustable friction mechanisms and the option of grade 316 for marine applications, supported by a national distribution network and technical support. Gretsch-Unitas (GU), a German manufacturer with a strong UK presence via its office in the West Midlands, offers the GU 265 and 365 series friction stays fabricated from stainless steel, known for their slimline profile and compatibility with extended sash weights, often