F and K Type Spiral Sash Balances

Our range of 'F' and 'K' type balances offer a general purpose spiral sash balance solution for both domestic and commercial applications.

They are supplied pre-tensioned for ease of fabrication and dual tension springs provide assisted lift, even with heavier installations.

  • Made in the UK
  • Suitable for timber and aluminium windows.
  • 'F' balances suitable for sashes up to 27kg (60lb) and 'K' balances up to 50kg (110lb)
  • Supplied pre-tensions with dual springs and a semi-flexible outer tube
  • Stainless steel spiral roads with white PVCu outer tube (available in grey, brown, black, cream and caramel)
  • All balances are sold in pairs

F Balance
Tube diameter: 17mm
Groove dimensions: 18mm
Weight Groups: up to 60lb

K Balance
Tube diameter: 19mm
Groove dimensions: 21.5mm
Weight Groups: up to 110lb

Spiral sash balances are bespoke for each window based on the dimensions and weight of each sash.

Complete our spiral sash balance form below for a quote or to place an order.

Sprial sash balance form pdf

Sprial sash balance form excel

F and K Type Spiral Sash Balances