Window Handle Measurement Guide (UPVC)

Handles & Hinges UPVC Maintenance Ltd is a UK specialist in replacement parts for UPVC windows and doors. Use this guide to measure the key sizes for the two common UPVC window handle types: espag (spindle type) and cockspur (spur over a wedge).

Tip: Open the window and support the sash. Most measurements are easiest with the handle removed—pop off any trim caps and undo the visible screws.

1) Identify your handle type

Espag handle — Square metal spindle on the back that drives the window lock (mushroom/roller cams). Usually two screws in-line.
Cockspur handle — Curved “spur” hooks over a plastic wedge on the frame. Usually two or three visible screws on the backplate.

2) Measuring an espag window handle

Spindle length
Measure from the underside of the handle backplate to the tip of the square spindle. Choose the same or the next size down if your original protruded too far.
Spindle section
Most espag spindles are 7 mm square. Confirm yours is square and not worn rounded.
Fixing screw centres
Measure centre-to-centre between the two screw holes. Most espag handles share a standard pattern, but measure to be sure.
Handing & key
Many espag handles are inline (non-handed). If yours is cranked, note left or right. Check whether you require locking (keyed) or non-locking.
Finish
Choose to match the existing furniture (white, chrome/satin, gold/brass, black, etc.).

3) Measuring a cockspur window handle

Stack height (the “A” dimension)
Place the handle on a flat surface and measure from the surface to the underside of the spur. This must match your frame/wedge height.
Handing
The spur points the way. Order left-hand or right-hand to match your original.
Backplate fixings
Note whether your handle has two or three screws, and the spacing between them (centre-to-centre) if needed.
Finish
Pick the colour/finish to match your other hardware.

Quick reference table

Handle type	Measure	Why it matters
Espag	Spindle length (backplate underside → tip)	Ensures spindle reaches the lock gearbox correctly
Espag	Spindle section (typically 7 mm square)	Must fit the gearbox drive square
Espag	Screw centres (two in-line)	Mounting holes must align
Cockspur	Stack height “A” (base → underside of spur)	Must match frame/wedge height for a tight close
Cockspur	Handing (left/right)	Spur orientation must match original
Both	Finish (white/chrome/gold/black etc.)	Match existing furniture and style

Shop Espag Window Handles Shop Cockspur Window Handles

FAQ

What spindle length do I need? Measure your old one from backplate to tip. If in doubt, choose the same length; too long can bottom out, too short may not engage.

My cockspur won’t latch after fitting — why? The stack height probably doesn’t match the wedge/frame gap. Re-measure the “A” dimension or change the wedge.

Do I need a locking handle? Many replacement handles are lockable with keys included. Choose locking for added security or where required by insurers/landlords.