1
Cylinder Measurement
CYLINDER
- AEdge to Centre (Exterior)
- BEdge to Centre (Interior)
- CTotal Length (A+B)
Standard Cylinders: Only measurements of C required. (E.g. 70mm = 35/35)
Offset and Half Cylinders: Measurements of A/B required. (E.g. 55/15)
Technical reference
Technical Guide
A practical measurement and handing reference for cylinders, lockcases, doors and windows. Use these definitions to identify the right hardware before sending an enquiry. This is a reference only — no measurements are calculated and no products are recommended here.
2
Lockcase Measurement
LOCKCASE
- ACase Width
- BCase Length
- CC2C
- DBackset
- EDeadbolt Length
- FForend Width
- GForend Length
Standard Measurements required for Lockcase: D+C (E.g. 6072 Lockcase, 60mm BS 72mm C2C)
Need help identifying the right hardware? Send us an enquiry.3
Door Handing — Left Hand & Right Hand
Door (While Facing from Exterior)
- Left Handed (LH)Hinges on the left side, Lock on the right side.
- Right Handed (RH)Hinges on the right side, Lock on the left side.
The door is viewed while facing the exterior when determining handing.
Need help identifying the right hardware? Send us an enquiry.4
Window Handing & Crescent Locks
Window
- Left Hand (LH)Friction stay on the left side, Lock on the right.
- Right Hand (RH)Friction stay on the right side, Lock on the left.
*Top Hung / Awning Windows standardly use RH Handle.
Crescent Lock
- Left Hand (LH)Installed on left side of window pane.
- Right Hand (RH)Installed on right side of window pane.
*LH resembles the shape of the left ear, RH resembles the shape of the right ear.
Need help identifying the right hardware? Send us an enquiry.Still unsure which hardware fits?
Send your measurements or a photo of your existing hardware and our counter team will help you identify the right part.