The 19mm Sash Stop (often referred to as a “Sash Vent” or “Limiter”) is a critical security and safety component for traditional timber sliding sash windows. Designed to be installed into the top sash stile, these 19mm Sash Stop allow the window to be opened approximately 100mm for ventilation while preventing it from being opened further from the outside.

The 19mm diameter is the professional architectural standard, providing a substantial strike surface for the window rail while remaining discreet enough to blend into the window’s vertical lines.

Technical Specifications of 19mm Sash Stop

These 19mm Sash Stop are engineered from solid metal to withstand significant impact force, ensuring the window remains locked even if a forced entry is attempted.

Feature	Detailed Specification
Diameter	19mm (Standard High-Strength Profile)
Operation Type	Strike Plate / Screw-in / Push-Button (Varies by model)
Material	Solid Forged Brass or Grade 304 Stainless Steel
Security Function	Restricts opening to approx. 100mm for ventilation
Installation	Recessed into the stiles of the upper sash
Included Accessories	High-tensile strike plates and fixing screws
Available Finishes	Polished Chrome, Satin Nickel, Antique Brass, Polished Brass

Design & Security Advantages

Dual-Functionality (Safety & Security): The 19mm Sash Stop serves two vital purposes: it prevents intruders from opening the window wide enough to gain entry, and it acts as a child safety restrictor, preventing accidental falls from upper-floor windows.
Architectural Integration: Unlike bulky surface-mounted locks, the 19mm Sash Stop is partially recessed. When the window is closed, the hardware is nearly invisible; when in use, it presents a sleek, coordinated metal finish that matches your sash lifts and fasteners.
Safe Ventilation: In the “locked” position, the window can be left open just enough to allow fresh air to circulate (typically 4 inches), making it the perfect solution for bedrooms and ground-floor rooms during summer months.
Heavy-Duty Resistance: The 19mm width provides a much larger surface area than cheaper 12mm or 15mm alternatives. This distributes the force of an impact more evenly across the timber, reducing the risk of the stop being sheared off or the timber splitting under pressure.

Primary Applications

Ground Floor Sash Windows: Provides essential “stay-open” security for windows that are accessible from the street or garden.
Upper-Floor Child Safety: A mandatory requirement for many rental properties and family homes to prevent children from opening windows too wide.
Period Home Restorations: Complements original Victorian and Georgian windows with a security feature that doesn’t compromise the historical aesthetic.
Summer Ventilation: Allows for constant airflow in bedrooms overnight without compromising the security of the property.

Professional Installation Tip: Precision and Clearance

For a sash stop to be effective, it must be installed with precision to ensure it catches the meeting rail squarely.

The 100mm Rule: Standard safety regulations usually suggest that the window should not open more than 100mm (4 inches) when the stop is engaged. Measure from the closed position up the stile before drilling your recess.
Install in Pairs: For maximum security, always install 19mm Sash Stop in pairs—one on the left stile and one on the right stile of the upper sash. This prevents the window from being “racked” or twisted by an intruder to bypass a single central lock.
Strike Plate Alignment: Most 19mm stops come with a small metal strike plate for the top of the bottom sash. This prevents the moving bolt from “bruising” or denting the timber over years of use. Ensure this plate is perfectly level so the bolt hits the center of the metal.
Keyed vs. Non-Keyed: For the highest security, choose a keyed version of the 19mm stop. This allows you to “deadlock” the bolt in the out position, preventing an intruder from using a wire or tool to depress the stop from the outside.

The 19mm sash stop is a practical and reliable solution for improving window security and functionality. Designed to restrict the opening of sash windows, it provides added safety while maintaining ventilation and ease of use. Manufactured from strong and durable materials, this fitting ensures long-lasting performance and resistance to daily wear. The simple design allows it to blend seamlessly with most window styles, making it a versatile choice for both traditional and modern properties.

Supplied in bulk packaging, this sash stop is ideal for contractors, landlords, or those completing multiple installations. Quick and easy to fit, it offers a cost-effective way to enhance window safety across residential or commercial spaces. Whether for home security, child safety, or controlled ventilation, the 19mm sash stop provides dependable performance. Combining strength, practicality, and convenience, this bulk-packed fitting delivers long-term value for securing sash windows.