Technical Foundation
What Is a Window Locks and Hardware?
Window lock hardware is specific to window type — double-hung and single-hung windows typically use a sash lock that clamps the upper and lower sash together, sliding windows use a latching lock engaging a keeper on the frame, and casement windows use a cam latch tied to the crank mechanism. Replacement hardware must match not just the window type but often the specific manufacturer's mounting hole pattern and screw spacing, which vary considerably even within the same window category.
Material and finish matter for both function and appearance — zinc die-cast bodies with a painted or plated finish are standard for residential sash locks, while higher-cycle commercial applications may specify stainless steel components for corrosion resistance and durability. Childproof and keyed variants add a security or child-safety function on top of the base locking mechanism, often required by code in multi-family or rental housing above the ground floor.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Window Type | Double-hung, sliding, casement, awning | Determines the lock mechanism type — sash lock, sliding latch, or cam latch |
| Mounting Pattern | Manufacturer-specific hole spacing | Replacement hardware must match the existing screw pattern or require new drilling |
| Lock Mechanism | Cam, hook, keyed cylinder, push-button | Determines security level and whether a key is required to unlock |
| Material | Zinc die-cast, stainless steel, aluminum | Stainless suits high-cycle commercial and coastal/corrosive environments |
| Finish | White, bronze, brushed nickel, painted | Matched primarily for appearance consistency across a building's window units |
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Organised by window type and lock mechanism. Pick a sub-category, or describe the window style you're servicing and let ChatMRO match the right hardware.
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Applications
Where Window Locks and Hardware Get Used
Window lock hardware is specified anywhere existing window locks need replacement or new window units require locking hardware to be installed.
Residential Window Replacement & Repair
Replacing worn or broken sash locks and latches on existing double-hung and sliding windows.
Multi-Family & Rental Housing Compliance
Childproof window locks installed to meet fall-prevention code requirements on upper-floor units.
Commercial Building Maintenance
Durable, high-cycle window hardware specified for commercial office and institutional buildings.
New Construction Window Manufacturing
Lock hardware specified as original equipment during window unit manufacturing.
Storm & Coastal Window Retrofits
Corrosion-resistant stainless hardware specified for windows in coastal or high-humidity environments.
Historic Building Restoration
Period-appropriate style sash locks sourced for restoration of older window units.
FAQ
Window Locks and Hardware Questions, Answered
How do I identify the right replacement sash lock for my window?
Note the window manufacturer if known, measure the mounting hole spacing on the existing lock, and match the lock mechanism style (cam, hook, or keyed) — most residential sash locks are semi-standardized but hole patterns vary enough between manufacturers that measuring the existing hardware is more reliable than guessing from window type alone.
Are childproof window locks required by law?
Many jurisdictions and building codes require window fall-prevention devices on upper-floor windows in multi-family or rental housing, particularly where children may reside — check your local building code, as requirements vary by jurisdiction and building type.
What's the difference between a cam latch and a sash lock?
A sash lock, used on double-hung and single-hung windows, clamps the upper and lower sash together at the meeting rail. A cam latch, used on casement and awning windows, rotates to draw the sash tight against the frame and is typically operated together with the window's crank mechanism.
Should I choose stainless steel or zinc die-cast hardware?
Zinc die-cast with a painted or plated finish is standard and adequate for typical residential interior use. Stainless steel is worth the upgrade for coastal, high-humidity, or high-cycle commercial applications where corrosion resistance and long-term durability matter more than initial cost.
Can I replace just the lock without replacing the whole window sash?
In most cases, yes — sash locks, cam latches, and sliding window locks are designed as replaceable hardware components that mount to the existing sash or frame, so a worn or broken lock can typically be swapped without replacing the entire window unit, provided a matching mounting pattern is found.
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