Hardware & Accessories
Sash Lock
Sash locks secure double-hung windows by clamping the upper and lower sashes together in the closed position. The crescent-shaped cam lock is most common, though various styles exist for different window types and aesthetics.
Beyond security, sash locks pull windows tight to weatherstripping, improving energy efficiency. Multiple locks on wide windows ensure even seal across the sash width.
Key Characteristics
- ✓Secures double-hung windows
- ✓Crescent shape common
- ✓Various finish options
- ✓Pulls sashes tight
- ✓Improves weathersealing
- ✓Period styles available
Types & Variations
Crescent sash lock (standard)
Cam sash lock
Fitch sash lock (heavy-duty)
Lever sash lock
Window sash lock with keeper
Works Well With These Styles
Placement & Usage Tips
Mount on meeting rail where sashes overlap. On wide windows, consider two locks for secure, even closure. Ensure keeper is properly positioned for tight lock.
💡 Pro Tip
Worn sash locks often allow drafts even when locked. The cam should pull sashes firmly together—replace loose or worn locks to restore weathersealing.