Whitco

Whitco Spiral Sash Balance No. 620 953 mm Body, 7.2510 kg, Standard Foot, Black W616202117

A Whitco spiral sash balance is a narrow, fully-sealed spiral-and-torsion-spring balance that counter-balances the sash of a timber or aluminium double-hung window, holding it open at any height without a cord or weight. This is Balance No. 620 with a 953 mm body, rated for the 7.2510 kg weight range, supplied with the standard foot attached.

Balance No. 620953 mm bodyClosed 978 mmExtended 1880 mmBlack7.2510 kgStandard foot

Key Features

Fully sealed spiral-and-torsion-spring constructionOil-tempered carbon steel torsion springZinc-plated variable-pitch spiralZinc diecast fixing plugTough ABS black polymer outer casingCorrosion-resistant stainless-steel sash foot plateAdjustable spring tension to suit the sashStandard foot attached, or supplied ready to accept an adjustable footRecommended 15 15 mm rebateAustralian made

Specifications

Type	Spiral sash balance (double-hung windows)
Balance number	No. 620
Body length (L)	953 mm
Closed dimension (C)	978 mm
Extended dimension (E)	1880 mm
Weight range	7.2510 kg
Foot	Standard foot attached
Tube colour	Black
Spring	Oil-tempered carbon steel torsion spring
Spiral	Zinc-plated variable pitch
Casing	ABS polymer; zinc diecast fixing plug; stainless-steel foot plate
Recommended rebate	15 15 mm
Origin	Australian made
Whitco code	W616202117

How to Choose the Right Balance

1Step 1 Balance number (length)
If you’re replacing a balance, measure the body length of the old unit and match the ‘L’ dimension in the size chart below. For a new top sash, measure the overall sash height including horns (the Closed ‘C’ dimension) and pick the balance whose C matches, or the next smaller. For a bottom sash, measure the window opening height from sill to head (the Extended ‘E’ dimension) and pick the balance whose E matches, or the next larger.2Step 2 Weight range
Weigh the sash, or estimate it from the glass thickness (see the guide below). Match the weight to Range 1 (2.257.25 kg), Range 2 (7.2510 kg) or Range 3 (1014 kg).3Step 3 Foot option
Choose the standard foot attached, or ‘no foot’ to fit an adjustable foot (ordered separately, together with the tension key).4Step 4 Colour
Whitco spiral balances are supplied in black only.

Working Out the Sash Weight

Glass thickness	Weight per m
3 mm	7.5 kg/m
4 mm	10.0 kg/m
5 mm	12.5 kg/m
6 mm	15.0 kg/m
Double-glazed 6+6 mm	30.0 kg/m

Multiply the weight per m 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.

Spiral Balance Size Chart

Balance No.	Body length (L)	Closed (C)	Extended (E)
No. 110	292 mm	318 mm	559 mm
No. 200	318 mm	343 mm	610 mm
No. 220	343 mm	368 mm	660 mm
No. 240	368 mm	394 mm	711 mm
No. 260	394 mm	419 mm	762 mm
No. 280	419 mm	445 mm	813 mm
No. 210	445 mm	470 mm	864 mm
No. 300	470 mm	495 mm	914 mm
No. 320	495 mm	521 mm	965 mm
No. 340	521 mm	546 mm	1016 mm
No. 360	546 mm	572 mm	1067 mm
No. 380	572 mm	597 mm	1118 mm
No. 310	597 mm	622 mm	1168 mm
No. 400	622 mm	648 mm	1219 mm
No. 420	648 mm	673 mm	1270 mm
No. 440	673 mm	699 mm	1321 mm
No. 460	699 mm	724 mm	1372 mm
No. 480	724 mm	749 mm	1422 mm
No. 410	749 mm	775 mm	1473 mm
No. 500	775 mm	800 mm	1524 mm
No. 520	800 mm	826 mm	1575 mm
No. 540	826 mm	851 mm	1626 mm
No. 560	851 mm	876 mm	1676 mm
No. 580	876 mm	902 mm	1727 mm
No. 510	902 mm	927 mm	1778 mm
No. 600	927 mm	953 mm	1829 mm
No. 620	953 mm	978 mm	1880 mm
No. 640	978 mm	1003 mm	1930 mm
No. 660	1003 mm	1029 mm	1981 mm
No. 680	1029 mm	1054 mm	2031 mm
No. 610	1054 mm	1080 mm	2083 mm
No. 700	1080 mm	1105 mm	2134 mm
No. 720	1105 mm	1130 mm	2183 mm

Closed ‘C’ = overall top-sash height (including horns). Extended ‘E’ = window opening height, sill to head. Match the dimension you can measure to pick the balance number.

Feet & Accessories

Standard adjustable foot (Weight Range 13)	W615100
TFD-type foot	W615200
Super heavy-duty adjustable foot	W615300
Tension key (for adjustable foot)	W492700
Long stop	W493000
Accessory kit (top + bottom stop + screws)	W492900

How to read the code: W61 [balance number] [weight range 13] [foot: 1 = attached, 0 = none] [17 = black]. Example W611101117 = Balance No. 110, weight range 1 (2.257.25 kg), foot attached, black.

10-Year Warranty

Whitco branded products are warranted free of defects in materials and workmanship (including mechanical parts) for 10 years from the date of purchase, under the Australian Consumer Law. Exclusions include normal wear and tear, misuse, improper installation and corrosion from coastal or high-humidity environments. Manufactured by ASSA ABLOY Australia. View warranty terms.In stock. Black is normally held in stock with the supplier. If you need help matching the right balance number, weight range or foot, call Prime Hardware on 1800 329 028.

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