uPVC Window Hinge Restrictor Securistyle Defender Friction Stay Pair

Pair of Restrictor Friction Window Hinge 16" 20" 24" Top Hung Securistyle Defender

Premium restrictor hinges that combine enhanced safety with effortless cleaning access – the smart solution for compliant top hung windows.

Securistyle Defender Restrictor Friction Hinges deliver uncompromising safety for top hung uPVC, aluminium, and timber windows without sacrificing functionality. Engineered with a patented two-handed restrictor release mechanism, these premium hinges limit initial window opening to protect children and residents while maintaining full cleaning access when needed. The intelligent design automatically resets the restrictor when you close the window, ensuring consistent protection without manual intervention.

Manufactured from high-grade ferritic stainless steel with enhanced corrosion resistance, these hinges feature a robust cam friction device that eliminates friction screw misuse. The handed profiled vent arm and extended enclosed end cap provide superior weather sealing, whilst the slot-hole-slot fixing format allows precise vent adjustment during installation. Backed by a comprehensive 10-year manufacturer's guarantee and rigorously tested to BS6375-2 standards, these hinges represent the gold standard in restricted window hardware.

Key Benefits:

• Enhanced Child Safety with BS6375-2 Compliance – Built-in restrictor mechanism limits initial opening angle, providing peace of mind for families whilst meeting Building Regulations requirements for upstairs windows
• Two-Handed Quick Release System – Intelligent safety lever requires deliberate two-handed operation to disengage restrictor, preventing accidental full opening whilst allowing easy access for cleaning and ventilation
• Auto-Reset Restrictor Technology – Patented mechanism automatically relocates and resets when window closes, ensuring consistent protection without requiring manual resetting or user intervention
• Superior Weather Sealing Performance – Handed profiled vent arm works in conjunction with extended enclosed end caps to create exceptional weather barriers, dramatically reducing draughts and energy loss
• Premium Ferritic Stainless Steel Construction – High-grade corrosion-resistant material ensures long-lasting performance even in coastal or high-moisture environments, outlasting standard mild steel alternatives
• Patented Cam Friction Device – Unique robust friction mechanism eliminates the risk of incorrect adjustment or friction screw misuse, maintaining optimal window operation throughout the hinge's lifespan
• Precise Installation Adjustment – Slot-hole-slot fixing format provides adjustability during fitting, allowing you to achieve perfect vent alignment and smooth operation even on slightly out-of-square frames
• Versatile Frame Compatibility – Suitable for uPVC, aluminium, and timber window frames with 18mm hinge width, making these hinges an ideal replacement option regardless of your window material
• Yale Quality Assurance – Now part of the trusted Yale family, these hinges benefit from decades of security hardware expertise and a comprehensive 10-year manufacturer's guarantee
• Multiple Size Options – Available in 16", 20", and 24" lengths to suit various window sizes, with different weight capacities and ventilation dimensions for optimal compatibility
• Tested & Certified Performance – Rigorously tested to BS6375-2 load bearing capacity standards, these hinges meet insurance and Building Regulations requirements for peace of mind

Technical Specifications by Size:

16 inch Size:
Max Weight: 21kg | Max Width: 750mm | Max Height: 500mm | Opening Angle: 60° | Restricted Angle: 10°

20 inch Size:
Max Weight: 24kg | Max Width: 1000mm | Max Height: 700mm | Opening Angle: 50° | Restricted Angle: 8°

24 inch Size:
Max Weight: 35kg | Max Width: 1200mm | Max Height: 850mm | Opening Angle: 37.5° | Restricted Angle: 7°

Product Specifications:

• Brand: Securistyle (Yale)
• Product Type: Top Hung Restrictor Friction Hinge (Pair)
• Available Sizes: 16", 20", and 24" lengths
• Stack Heights: 13mm or 17mm (please select when ordering)
• Material: High-grade ferritic stainless steel
• Hinge Width: 18mm (standard fitting)
• Fixing Format: Slot-hole-slot for adjustment capability
• Window Type: Top hung windows - suitable for uPVC, aluminium, and timber frames (handle on bottom)
• Compliance: Tested to BS6375-2 load bearing capacity standards
• Guarantee: 10 years manufacturer's warranty
• Fixings: Screws NOT supplied (allows choice of appropriate fixings for your frame material)

Important Measurement Note: The restricted opening gap is controlled by three factors: (A) the restricted opening angle shown in specifications, (B) your window frame thickness, and (C) the vent size. Please ensure you select the appropriate hinge size based on your window dimensions and weight.

Pro Tips:

Pro Tip: Before removing your old hinges, take a photograph and carefully measure the stack height (hinge depth when closed). This 13mm or 17mm measurement is critical for correct replacement – there's a 4mm difference between the two, and the wrong size won't sit flush with your frame. If you're unsure, the 13mm is more common on newer windows (2000 onwards), whilst 17mm typically appears on windows from the 1990s. When installing, use the slot-hole-slot format to your advantage by loosely fitting all screws first, then adjusting the vent position before final tightening for perfect alignment and smooth operation.

Package Contents:

• 1 × Pair of Securistyle Defender Top Hung Restrictor Friction Hinges (Left and Right handed)

Frequently Asked Questions:

How do I measure my existing hinges to ensure I order the correct replacement size?
First, confirm you have top hung windows (hinges at the top, handle at the bottom). Measure the hinge length from end to end of the metal section that fixes to the outer frame (not the opening sash). This gives you the 16", 20", or 24" size. Next, measure the hinge width – almost all modern window hinges (uPVC, aluminium, and timber) are 18mm wide, which these fit perfectly. Finally, measure the stack height (the depth of the closed hinge) – you'll need either 13mm or 17mm. If you measure approximately 13-14mm, choose 13mm; if 16-18mm, choose 17mm. The 4mm difference between options makes this measurement straightforward.

Will these restrictor hinges comply with Building Regulations for upstairs windows?
Yes, the Securistyle Defender hinges are specifically designed to meet Building Regulations requirements for restricted window openings. They've been rigorously tested to BS6375-2 standards for load bearing capacity of safety devices. The restricted opening angles (10°, 8°, or 7° depending on size) limit the initial gap to a safe distance whilst the two-handed quick release allows full opening for cleaning when required. This combination satisfies both safety requirements and practical functionality, making them ideal for bedrooms, children's rooms, and any upstairs windows where fall prevention is essential.

What's the difference between 13mm and 17mm stack height, and which do I need?
Stack height refers to the depth of the hinge when it's closed – essentially how far it protrudes from the frame. This measurement is crucial because it determines how the hinge sits in your window frame's existing groove. If you fit a 17mm hinge where a 13mm should go, it will protrude and prevent the window from closing properly. Conversely, a 13mm hinge in a 17mm groove will sit too deep and may not operate correctly. Generally, windows installed from 2000 onwards use 13mm hinges, whilst older windows (1990s) typically use 17mm. However, always measure your existing hinges to be certain – the 4mm difference is easy to identify with a ruler or tape measure.

How does the two-handed restrictor release mechanism work, and can children defeat it?
The restrictor release is deliberately designed to require simultaneous two-handed operation, making it virtually impossible for young children to accidentally or deliberately disengage. To release the restrictor, you must press the lever mechanism whilst simultaneously pushing the window open – a coordinated action that requires adult strength and dexterity. When you close the window, the restrictor automatically resets without any manual intervention, ensuring protection is maintained every time. This intelligent design provides peace of mind whilst still allowing adults easy access for window cleaning, emergency ventilation, or escape if needed. The mechanism is built to last, with no springs or weak points that could fail over time.

Do these hinges come with fixing screws, and what type should I use?
Fixing screws are deliberately not supplied with these hinges, allowing you to select the most appropriate screws for your specific window frame material and condition. For uPVC frames, we recommend using 4mm diameter self-tapping screws with a length of 25-30mm – these provide excellent grip without cracking the plastic. For timber frames, wood screws of similar diameter work best. For aluminium frames, use self-tapping metal screws designed for aluminium (typically 4-5mm diameter). The slot-hole-slot fixing format gives you adjustment capability during installation, so don't fully tighten all screws immediately – loosely fit them first, adjust the vent position for smooth operation, then tighten sequentially. This approach ensures perfect alignment and prevents binding or stiffness. Always pilot drill screw holes in uPVC to prevent splitting, especially near frame edges.

Why Choose Securistyle Defender Restrictor Hinges?

When you're responsible for protecting your family whilst maintaining a comfortable, well-ventilated home, compromise simply isn't an option. Securistyle Defender hinges, now backed by Yale's century of security expertise, represent the pinnacle of restricted window hardware engineering. The patented cam friction device and auto-reset restrictor technology deliver reliability you can depend on year after year, whilst the premium ferritic stainless steel construction ensures these hinges will outlast your original fittings by a considerable margin.

Whether you're a professional installer demanding components that meet Building Regulations without callbacks, or a homeowner investing in your family's safety and your property's energy efficiency, these hinges deliver reliable performance with straightforward installation. The intelligent two-handed release mechanism provides genuine peace of mind, not just a token safety feature, whilst the superior weather sealing addresses the draughts and heat loss that plague ageing window hardware. Choose Securistyle Defender hinges and experience the confidence that comes from installing the very best restricted window hardware available in the UK market.