What is a sash pulley?

A sash pulley is a small wheel-and-housing unit fitted into the top of the pulley stile on each side of a sash window frame. The sash cord passes over the pulley wheel, connecting the sash to a counterbalancing weight concealed within the window box. The pulley allows the cord to run freely so the window can be raised and lowered with minimal effort.

What is the difference between a radius end and square end sash pulley?

The difference is in the shape of the forend plate -- the face plate that sits flush with the surface of the pulley stile. A radius end pulley has rounded corners, which suits the curved rebates cut in traditional timber window frames. A square end pulley has straight corners and is more commonly used in modern joinery or where a cleaner profile is preferred.

How do I know what size sash pulley to order?

Measure the wheel diameter of the existing pulley if it is still in place, or measure the width of the pulley housing in the stile. The three standard sizes are 1 3/4 inch, 2 inch, and 2 1/4 inch. If the window has particularly heavy sashes, opt for a larger size with a higher load rating.

Can I replace just the sash pulley, or do I need to replace the sash cord too?

In many cases both will need attention at the same time. If a pulley has seized or worn significantly, there is a good chance the sash cord has also deteriorated. Replacing both while the window is open saves repeating the job shortly afterwards. Sash cord is available separately and should be matched to the weight of the sash.

Are your sash pulleys suitable for both sash cord and sash chain?

This depends on the individual product. Some pulleys are designed specifically for use with sash cord, while others accommodate sash chain. Check the product description before ordering if you are using chain rather than cord.

Do you supply sash pulleys in trade quantities?

Yes. If you are working across a larger project or restoration programme, contact our team for trade pricing. We supply sash window hardware to joiners, window restoration specialists, contractors, and developers throughout the UK.