Whitco Spring Sash Balance – 600–650 mm Sash, 495 mm Tube, 6.0–9.25 kg (Grey Cap), Black W631261
Whitco Spring Sash Balance – 600–650 mm Sash, 495 mm Tube, 6.0–9.25 kg (Grey Cap), Black W631261
A Whitco spring sash balance is a narrow tension-spring and friction-foot balance for aluminium double-hung windows, holding the sash at any height. This unit suits a 600–650 mm sash with a 495 mm tube, rated 6.0–9.25 kg and identified by a grey end cap.
Key Features
Specifications
| Type | Spring sash balance (aluminium double-hung windows) |
| Sash height range | 600–650 mm |
| Tube length | 495 mm |
| Weight rating | 6.0–9.25 kg |
| End-cap colour | Grey |
| Maximum sash weight | 22 kg (range dependent) |
| Spring | Oil-tempered galvanised carbon steel tension spring |
| Foot | Stainless-steel bow spring with adjustable polymer friction pads |
| Casing | Tough ABS black polymer |
| Tube colour | Black |
| Origin | Australian made |
| Whitco code | W631261 |
How to Choose the Right Balance
Match your sash height to the size chart below to get the tube length.
Weigh the sash, or estimate it from the glass thickness (see the guide below), then choose the end-cap colour: Green up to 6 kg, Grey 6–9.25 kg, Brown 9.25–11 kg, Red 11–18 kg, Blue 18–22 kg.
Choose the friction foot to suit your window section (standard wide, W, J or A&L).
Working Out the Sash Weight
| Glass thickness | Weight per m² |
|---|---|
| 3 mm | 7.5 kg/m² |
| 4 mm | 10.0 kg/m² |
| 5 mm | 12.5 kg/m² |
| 6 mm | 15.0 kg/m² |
| Double-glazed 6+6 mm | 30.0 kg/m² |
Multiply the weight per m² by the sash glass area (double the figure for double-glazed), then add an allowance for the sash frame. Best practice is to weigh the sash for an accurate result.
Weight Ranges & End-Cap Colours
| End cap | Sash weight | Code ends in |
|---|---|---|
| Green Cap | Up to 6.0 kg | 51 |
| Grey Cap | 6.0–9.25 kg | 61 |
| Brown Cap | 9.25–11.0 kg | 71 |
| Red Cap | 11.0–18.0 kg | 81 |
| Blue Cap | 18.0–22.0 kg | 91 |
Spring Balance Size Chart
| Sash height | Tube length |
|---|---|
| 350–400 mm | 245 mm |
| 400–450 mm | 295 mm |
| 450–500 mm | 345 mm |
| 500–550 mm | 395 mm |
| 550–600 mm | 445 mm |
| 600–650 mm | 495 mm |
| 650–700 mm | 545 mm |
| 700–750 mm | 595 mm |
| 750–800 mm | 645 mm |
| 800–850 mm | 695 mm |
| 850–900 mm | 745 mm |
| 900–950 mm | 795 mm |
| 950–1000 mm | 845 mm |
| 1000–1050 mm | 895 mm |
| 1050–1100 mm | 945 mm |
| 1100–1150 mm | 995 mm |
Match your sash height to the row, then choose the end-cap colour for the sash weight (see the weight guide).
Feet & Accessories
| Standard wide foot (2.5 mm) | W635100 |
| J foot (G. James sections) | W635500 |
| A&L foot | W635600 |
| W foot | W635900 |
| Accessory hook, 325 mm | W493100 |
| Accessory hook, 500 mm | W492800 |
10-Year Warranty
How do I choose the right spring balance?
Match your sash height to the size chart to get the tube length, then choose the end-cap colour for the sash weight: Green up to 6 kg, Grey 6–9.25 kg, Brown 9.25–11 kg, Red 11–18 kg, Blue 18–22 kg. Finally choose the friction foot to suit your window section.
How do I work out the sash weight?
Weigh the sash, or estimate from the glass: 3 mm ≈ 7.5 kg/m², 4 mm ≈ 10, 5 mm ≈ 12.5, 6 mm ≈ 15, double-glazed 6+6 mm ≈ 30 kg/m². Multiply by the glass area, add a frame allowance, then pick the matching end-cap colour.
Why do the codes and lengths differ?
The tube length is set by the sash height — this one suits a 600–650 mm sash with a 495 mm tube. The last two digits of the code are the weight range / end-cap colour, so both length and weight are built into the part number.
Which foot do I need?
The friction foot depends on your window section: a standard wide foot (W635100), W foot (W635900), J foot for G. James sections (W635500), or A&L foot (W635600).
What's the difference between a spiral and a spring balance?
Both counter-balance a double-hung sash so it stays open at any height. A spiral balance uses a variable-pitch spiral and torsion spring in a fully sealed tube (timber or aluminium windows); a spring balance uses a tension spring and a friction foot (aluminium windows). They are not interchangeable — match the type to your existing window.
Is it in stock?
Whitco sash balances are supplied in black, which is normally held in stock with the supplier. If you need help matching the balance number, weight range or foot, call Prime Hardware on 1800 329 028.
What warranty applies?
Whitco products carry a 10-Year Warranty against defects in materials and workmanship, under the Australian Consumer Law. Manufactured by ASSA ABLOY Australia.
How can I get help?
Call Prime Hardware on 1800 329 028, email sales@primehardware.com.au, or visit the showroom at 2/249 Annangrove Road, Annangrove NSW 2156. Tell us your sash height, sash weight (or glass thickness) and window section and we'll match the exact balance, weight range and foot for you.
