How to Measure a Cockspur Handle for Replacement

Replacing a cockspur handle is a common task for window fitters and competent DIYers. Getting the measurements right avoids wasted trips and returns, and ensures the new cockspur handle functions correctly. This guide explains how to measure a cockspur handle for replacement in clear, practical steps; it covers centre-to-centre, backset, handle length, spindle size, and screw positions. Trade tips and common pitfalls are included to help both professionals and homeowners make the right choice.

What is a cockspur handle and why accurate measurement matters

A cockspur handle is a simple, surface-mounted window handle that clamps onto the edge of the window sash with a spur or lug. Because it mounts externally rather than through the sash, small differences in dimensions can still affect fit and operation. Measuring a cockspur handle accurately is essential to ensure the spur lines up with the window frame and that the handle clears glazing and trims. For tradespeople, accurate measurement reduces time on site and avoids repeat visits; for DIYers, it prevents ordering the wrong part and risking damage during installation.

Tools you will need

• Tape measure with millimetre graduations
• Vernier calipers or a digital caliper for precise spindle and screw measurements
• Straight edge or ruler
• Marker or pencil to mark points
• Camera or smartphone to photograph existing handle for reference
• Screwdriver set to remove the old cockspur handle if necessary

Step-by-step: measuring the cockspur handle

1. 1Identify the handle type: Confirm the existing part is a cockspur handle rather than a mortice or espagnolette. The cockspur handle is surface mounted with one or two spurs that clamp around the sash edge. Photograph the handle and both sides of the sash to capture orientation.
2. 2Measure the centre-to-centre distance: The centre-to-centre distance is the most important measurement when replacing a cockspur handle. Measure from the centre of the fixing screw at the top of the handle to the centre of the fixing screw at the bottom. If there is only one screw, measure from the centre of that screw to the tip of the cockspur spur; many manufacturers list the centre-to-centre as a standard. Record this value in millimetres.
3. 3Measure the backset: The backset is the distance from the back of the handle base to the face of the spur or latch. For a cockspur handle, measure from the outside face of the handle base to the outermost point of the spur when closed. This ensures the spur will engage the frame correctly.
4. 4Check handle length and projection: Measure the overall handle length from the pivot to the end of the lever. Also measure how far the handle projects when in the closed position, to ensure it will not foul any trim or glazing beads.
5. 5Measure screw spacing and diameter: Note the size and thread pitch of the fixings. Use calipers to measure the screw heads and the distance between screw centres if there are more than two. Many replacements are supplied with standard screws, but some older windows use non-standard fixings.
6. 6Measure spur thickness and profile: The thickness of the spur where it clamps the sash matters. Measure the gap it occupies and the profile shape. A replacement cockspur handle should accommodate the same sash thickness or include adjustable spurs to suit a range of sash sizes.
7. 7Check spindle size where applicable: Some cockspur handles include a spindle or square drive that engages a lock mechanism. Measure the spindle length and thickness; record whether the spindle is a solid square or a split type. This prevents choosing a handle with an incompatible spindle.

Common variations and what to watch for

• Single spur versus double spur: Some cockspur handles have a single spur; others have two. Confirm the number and position before ordering a replacement cockspur handle.
• Reversible spurs: Certain handles have reversible spurs to suit left or right opening windows; check orientation so you order the correct handed cockspur handle.
• Security features: Upgraded cockspur handles may include key locks or dog bolts. If your window requires a locking cockspur handle, measure for the lock cylinder and any additional clearance for keys.
• Material and finish: Consider corrosion resistance for coastal installs; choose a stainless steel or corrosion-resistant finish to prolong life. Match the finish to existing hardware for a neat trade installation.

Practical trade tips for installation

• Carry common sizes: As a trade supplier, consider stocking the most common centre-to-centre sizes and a selection of adjustable spur handles to cover on-site replacements quickly.
• Bring spare fixings: Always bring a small kit of screws and packing shims to adjust for minor sash variations during installation of a cockspur handle.
• Use threadlocker where appropriate: For windows that are used frequently, a small amount of threadlocker on quickly loosening screws can reduce call-backs; do not use where future adjustment is likely.
• Test operation: After fitting the new cockspur handle, open and close the window several times to check that the spur engages smoothly and that the handle clears trims and beads.

Recommended Products

Based on this article, you may find these products helpful:

• TSS Cockspur Window Handles
• TSS Offset UPVC Window Handles
• ERA Universal Inline Window Handle
• In-Line Window Handle - White
• ERAB Espagnolette Window Lock Universal Lock Replacement

Conclusion

Measuring a cockspur handle for replacement is straightforward when you follow a consistent method: confirm the handle type, record centre-to-centre distances, check backset and spur profile, and note screw and spindle sizes. For tradespeople, carrying a modest range of common cockspur handle sizes and adjustable options will speed up on-site replacements; for DIYers, taking clear photos and accurate millimetre measurements will ensure you order the correct part first time. With the right measurements, replacing a cockspur handle is a quick, reliable way to restore window operation and security.