UK Manufactured Steel Sash Weights — Lead-Free Joinery Alternative
Heaps, Arnold & Heaps Ltd manufactures steel sash weights at our Rotherham facility as a modern lead-free alternative for traditional sliding sash window joinery. With over 250 years of materials manufacturing experience, we supply window manufacturers, joinery shops, listed building specialists and heritage restoration contractors across the UK and internationally.
Our steel sash weights are produced from solid steel bar in standard weights from 6lb (2.7kg) up to 35lb (15.8kg) in 1lb increments — drilled for sash cord fixing and supplied in 40mm, 45mm and 50mm square profiles. Bespoke weights and dimensions are produced to order for non-standard sash window builds and conservation projects.
Why Choose Heaps, Arnold & Heaps Steel Sash Weights?
- UK manufactured at our Rotherham facility — full traceability
- Lead-free composition for projects where lead is restricted or undesirable
- Full weight range from 6lb to 35lb in 1lb increments — no gaps in the schedule
- Pre-drilled for sash cord — ready to install without secondary preparation
- Three standard profiles — 40mm, 45mm and 50mm square to suit common sash pocket dimensions
- Bespoke weights manufactured to specification for non-standard builds
- Trade pricing for window manufacturers and joinery accounts
- Over 250 years of expertise — established 1770
Why Use Steel Sash Weights Instead of Lead?
Traditional sash windows have always been counter-balanced with cast lead sash weights, and for most restoration work lead remains the correct historic specification. However, an increasing number of joinery and construction scenarios require a lead-free alternative:
- New-build sash windows — modern construction specifications increasingly exclude lead components
- Schools, nurseries and healthcare buildings — where lead exposure risk must be eliminated
- Listed buildings where lead is restricted — some conservation officers now specify lead-free where the original weights have been lost
- Export markets with restrictions on lead in construction materials
- Sustainable construction projects aligned with BREEAM or similar frameworks
- Conservation projects where the original counterweights were not lead (some Edwardian and later sashes used iron)
Steel sash weights deliver the same counterbalance performance as traditional lead weights, with the same fixing detail and the same finished sash operation — but without lead content.
Standard Weight Range & Profiles
Our standard steel sash weights are produced in 1lb increments across the full counter-balance range required by most domestic and commercial sash windows.
Available Weights
- 6lb (2.7kg) through to 35lb (15.8kg)
- 1lb increments — no gaps in the schedule for matching to glass weight
- Custom weights manufactured to order for oversized or non-standard sashes
Profile Options
- 40mm square — for standard domestic sash pocket dimensions
- 45mm square — for medium sash pocket builds
- 50mm square — for larger sash windows and commercial joinery
- All steel sash weights are supplied pre-drilled top and side for sash cord fitment.
Bespoke Steel Sash Weights
Standard sizes cover the majority of sash window builds, but conservation, listed building and architectural joinery work frequently requires non-standard counterweights. We manufacture bespoke steel sash weights at our Rotherham facility to drawing, sample or specification.
Typical Bespoke Projects
- Non-standard weights outside the 6–35lb range for oversized sashes
- Custom profiles for awkward sash pocket dimensions or modern thin-frame joinery
- Matched-pair replacements where one original weight has been lost
- Period-matched weights for high-end heritage restoration where iron weights need replacement
- Lead-substitute conversions — replacing lost lead weights with steel equivalents of identical mass
- Volume orders for new-build housing developments and commercial joinery contracts
How Bespoke Orders Work
- Send us your weight requirement, profile dimensions and quantity
- We respond within 1 working day with availability and lead time (typically 1–3 weeks for bespoke)
- On approval we machine, drill and dispatch with documentation
Steel Sash Weights for New Build & Heritage Joinery
New-Build Sash Windows
For modern sash window manufacturers building to contemporary specifications, steel sash weights are now the default counterweight for projects where lead is restricted by specification, end-use or sector. We supply window manufacturers across the UK on trade account with stock-held standard weights and rapid dispatch.
- Volume pricing for window manufacturer accounts
- Stock-held standard weights for short lead times
- Documentation supplied for project specification files
- Mixed-weight pallets to match project schedules
Heritage Restoration & Listed Buildings
For listed building restoration where the original lead counterweights have been lost, damaged or removed, steel sash weights provide a like-for-like counterbalance without lead. The decision between specifying lead or steel sash weights for restoration work should be made in consultation with the project’s conservation officer — for most pre-war buildings, lead remains the correct historic specification, but where it cannot be used, steel matches the counterweight performance exactly.
- Matched to original sash window pocket dimensions
- Weight-matched to original counterbalance schedule
- Documentation suitable for inclusion in conservation reports
Who We Supply
Our steel sash weights are used across the UK joinery, construction and conservation sectors:
- Window manufacturers producing sash windows for new-build and replacement
- Joinery shops specialising in sash window restoration and repair
- Listed building restoration contractors
- Heritage property maintenance teams — National Trust, English Heritage, private estates
- Architectural ironmongers supplying sash window hardware
- Conservation specialists working on Victorian and Edwardian housing stock
- Sash window repair specialists working with the public
- Modular and offsite construction manufacturers producing sash-windowed units
- Self-build and bespoke joinery projects via specialist suppliers
Material Quality & Specification
Steel sash weight performance depends on consistent density and dimensional accuracy. All our steel sash weights are:
- Manufactured at our UK facility from solid steel bar
- Machined to consistent weight tolerance across each batch
- Pre-drilled for sash cord with chamfered exit
- Supplied with documentation suitable for project specification files
- Inspected for dimensional accuracy before dispatch
How to Order Steel Sash Weights
All sash weight orders are processed on a quote-led basis to confirm exact weight, profile and quantity:
- Submit a quote request with weights required, profile, quantities and any drawings
- We respond within 1 working day with availability, pricing and lead time
- Once approved, your order is machined, drilled and dispatched with documentation
For trade accounts and ongoing supply arrangements with window manufacturers and joinery shops, contact our team directly to discuss credit terms, volume pricing and BACS payment.
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