New Window Handles: How to Measure Spindle Length and Centres

Installing new window handles requires accurate measurements to ensure a correct fit and smooth operation. This guide explains how to measure spindle length and centres for common handle types, offering practical, step-by-step advice for homeowners and tradespeople. Clear measurement techniques reduce returns and refitting time when ordering new window handles.

Identify the handle type

Different handle types need different measurements. Common variants include espag (espagnolette) handles used on uPVC and double-glazed windows, cockspur handles for older timber or metal frames, and lever/lockable handles for enhanced security. Identifying the type helps determine which dimensions are essential and which products are compatible. Examples include the TSS Cockspur Window Handles, TSS Cockspur Window Handle and TSS Offset UPVC Window Handles.

Tools required

Prepare basic tools:

• Tape measure or ruler (mm scale preferred)
• Vernier calipers for more accurate spindle measurements (optional)
• Straight edge or square to align measurements
• Notebook and pen or smartphone to record dimensions
• Masking tape to hold a tape measure in place when measuring alone

Measure spindle length (the shaft)

Spindle length is the distance the square shaft (spindle) projects from the back of the handle rose or mounting plate to the end of the spindle. Accurate spindle length ensures the spindle reaches the internal mechanism without bottoming out or being too long.

Step-by-step: 1. Remove the handle: For the most accurate reading, remove the handle from the window. Release any grub screws or remove the rose cover to access the spindle. 2. Measure from the back of the rose to the end of the spindle: Lay a tape measure or ruler against the flat face that sits against the frame and measure to the tip of the square spindle. Record in millimetres. 3. Account for split spindles or adaptors: Some handles use a 5 mm or 8 mm square spindle; others use split spindles or adapters. Note the spindle thickness and whether it is removable. 4. Double-check with calipers: If precise fitment is required, use calipers to measure the spindle width as well as the length.

Typical spindle lengths: Common lengths are 25 mm, 35 mm, 40 mm and 45 mm on one side (measured from the rose), but total lengths can vary. When ordering new window handles, match both length and square size.

Measure handle centres (fixing centres)

Fixing centres are the distance between the centres of the screw holes on the handle rose or backplate. This measurement is crucial when replacing handles without drilling new holes.

Step-by-step: 1. Measure between screw holes: With the handle still in place (or by using the removed handle), measure centre to centre of the mounting screws. Use the inner edges of the screws as a guide and measure to the centre point. 2. Measure both horizontally and vertically if applicable: Some handles have asymmetrical mounting patterns. Note whether the centres are aligned horizontally or vertically. 3. Record plate dimensions: For backplates, record the overall plate width and height as well as the centres to ensure the new handle covers any existing holes if required.

Common centres: Many euro-style handles use 43 mm or 48 mm centres, while cockspur handles often have varied centres so measuring is essential.

Measuring for espag (espagnolette) handles

Espag handles connect to a multi-point locking rod via a square spindle and sometimes a backplate. The following additional measurements are required:

• Spindle length: As above, measured from the back of the rose to the spindle tip.
• Backset: The distance from the edge of the handle rose to the centre of the spindle. This helps ensure the handle sits correctly on the sash.
• Spindle size: Most espag spindles are 7 mm or 8 mm squares. Confirm the square measurement.
• Locking cam/gear position: Note whether the handle operates a locking mechanism on the face or side and measure any offset.

Espag handles such as the TSS Cockspur Window Handles often specify spindle length and square size in the product description; match those to the measured values.

Measuring cockspur handles

Cockspur handles are surface-mounted and rely on the cockspur latch engaging the frame. Measuring focuses on the backplate and the projection of the spur.

• Spur length: Measure from the back of the plate to the tip of the cockspur.
• Backplate centres: Measure between screw centres to match existing holes.
• Spur orientation: Confirm left or right handed spur, depending on sash opening direction.

Cockspur options such as the TSS Cockspur Window Handle indicate hand and dimensions to help select a direct replacement.

Common pitfalls and practical tips

• Measure twice: Avoid ordering the wrong size by taking two independent measurements.
• Note handedness: Handles are left- or right-handed by spindle orientation and spur direction. Record the side of the window and orientation when measuring.
• Check for obstructions: Internal spoil such as paint buildup can change effective spindle length; remove any paint around the mechanism before measuring.
• Use templates: When replacing without removing the old handle, use a paper or cardboard template to transfer centres and backset more accurately.
• Consider lockable options: For improved security or child safety, consider lockable lever handles like the TSS Offset UPVC Window Handles which combine aesthetics and key-lock security.

Ordering and installation notes

When ordering new window handles, provide spindle length, spindle square size, fixing centres and handedness. For tradespeople specifying multiple handles, compile a schedule with serial numbers and window locations to avoid confusion. On receipt, check that spindles match the measured dimensions before fitting; small adaptors and replacement spindles are sometimes available to bridge minor differences.

Installation:

• Fit the handle so the spindle fully engages the gearbox without binding.
• Tighten grub screws securely but avoid over-tightening which can strip threads or damage finishes.
• Test the operation through full travel to ensure the locking mechanism engages correctly.

Accurate measurement prevents delays and improves the fit and function of new window handles. For a comprehensive overview of handle types, measurements and fitting advice, consult the Window Handles Guide.