Springs - Constant Force

4 Products in this selection
  • 301 Stainless Steel
  • Mounting hole specifications will be supplied on request. These springs are usually mounted on a drum and the free end attached to a loading force like a counterbalance.
  • Free ID may vary to meet load specification.
  • Load capacity can be increased by using multiple strips in tandem, back to back or laminated.
  • Be sure to leave at least 40mm coiled on the drum at full extension. The spring ID will wrap tightly on the drum so that most applications require no fastening to the drum.
Additional resources:
A more concise listing may be found on the Smallparts store at Springs - Constant Force. Smallparts promote the most popular MBA products.
Load Band Length Thickness (t) Band Width (W) Free ID (Ref. Only) Drum Diameter Indicative
Image
Load
1.0
Newtons
+/- 10%
Band Length
406.4
mm
Thickness (t)
0.102
mm
Band Width (W)
6.35
mm
Free ID (Ref. Only)
13.10
mm
Drum Diameter
16.0
1038235 | CFS-0010-0406-064-S1 (10 Pcs) --- Constant Force Springs - 1 Newtons - 406.4x0.102 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Cycles Life: 20000    Mounting Holes: 1 mm    Initial Extension (f1): 24130.0 mm    Max. Working Deflection (f2): 304.8   
Part Number: CFS-0010-0406-064-S1 (10 Pcs) Constant Force Springs - 1 Newtons - 406.4x0.102 mm - Spring Steel Music Wire
1 pack (10 pcs) Available Immediately | Item Discontinued - Only the quantity available may be ordered - Please contact us if you need a larger quantity
$20.00 AUD
$38.00 AUD $20.00 AUD
Per 10
Load Band Length Thickness (t) Band Width (W) Indicative
Image
Load
1.0
Newtons
+/- 10%
Band Length
406.4
mm
Thickness (t)
0.102
mm
Band Width (W)
6.35
mm
1038235 | CFS-0010-0406-064-S1 (10 Pcs) --- Constant Force Springs - 1 Newtons - 406.4x0.102 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Free ID (Ref. Only): 13.10 mm    Drum Diameter: 16.0    Cycles Life: 20000    Mounting Holes: 1 mm    Initial Extension (f1): 24130.0 mm    Max. Working Deflection (f2): 304.8   
Part Number: CFS-0010-0406-064-S1 (10 Pcs) Constant Force Springs - 1 Newtons - 406.4x0.102 mm - Spring Steel Music Wire
1 pack (10 pcs) Available Immediately | Item Discontinued - Only the quantity available may be ordered - Please contact us if you need a larger quantity
$20.00 AUD
$38.00 AUD $20.00 AUD
Per 10
Load
1.4
Newtons
+/- 10%
Band Length
381.0
mm
Thickness (t)
0.102
mm
Band Width (W)
6.35
mm
Free ID (Ref. Only)
11.11
mm
Drum Diameter
13.5
1038947 | CFS-0014-0381-064-S1 --- Constant Force Springs - 1.4 Newtons - 381x0.102 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Cycles Life: 13000    Mounting Holes: 1 mm    Initial Extension (f1): 20.3 mm    Max. Working Deflection (f2): 304.8   
Part Number: CFS-0014-0381-064-S1 Constant Force Springs - 1.4 Newtons - 381x0.102 mm - Spring Steel Music Wire
2648 Available Immediately | Item Discontinued - Only the quantity available may be ordered - Please contact us if you need a larger quantity
$3.00 AUD
$5.70 AUD $3.00 AUD
Each
Load
1.4
Newtons
+/- 10%
Band Length
381.0
mm
Thickness (t)
0.102
mm
Band Width (W)
6.35
mm
1038947 | CFS-0014-0381-064-S1 --- Constant Force Springs - 1.4 Newtons - 381x0.102 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Free ID (Ref. Only): 11.11 mm    Drum Diameter: 13.5    Cycles Life: 13000    Mounting Holes: 1 mm    Initial Extension (f1): 20.3 mm    Max. Working Deflection (f2): 304.8   
Part Number: CFS-0014-0381-064-S1 Constant Force Springs - 1.4 Newtons - 381x0.102 mm - Spring Steel Music Wire
2648 Available Immediately | Item Discontinued - Only the quantity available may be ordered - Please contact us if you need a larger quantity
$3.00 AUD
$5.70 AUD $3.00 AUD
Each
Load
8.8
Newtons
+/- 10%
Band Length
812.8
mm
Thickness (t)
0.254
mm
Band Width (W)
15.88
mm
Free ID (Ref. Only)
28.18
mm
Drum Diameter
33.8
1083458 | CFS-0088-0813-159-S1-TW --- Constant Force Springs - 8.8 Newtons - 812.8x0.254 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Cycles Life: 13000    Mounting Holes: 1 mm    Initial Extension (f1): 50.8 mm    Max. Working Deflection (f2): 609.6   
Part Number: CFS-0088-0813-159-S1-TW Constant Force Springs - 8.8 Newtons - 812.8x0.254 mm - Spring Steel Music Wire
450 Available Immediately | Further orders can be expected around Sat, Jul 12, 2025
$17.05 AUD
$17.05 AUD
Each
Load
8.8
Newtons
+/- 10%
Band Length
812.8
mm
Thickness (t)
0.254
mm
Band Width (W)
15.88
mm
1083458 | CFS-0088-0813-159-S1-TW --- Constant Force Springs - 8.8 Newtons - 812.8x0.254 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Free ID (Ref. Only): 28.18 mm    Drum Diameter: 33.8    Cycles Life: 13000    Mounting Holes: 1 mm    Initial Extension (f1): 50.8 mm    Max. Working Deflection (f2): 609.6   
Part Number: CFS-0088-0813-159-S1-TW Constant Force Springs - 8.8 Newtons - 812.8x0.254 mm - Spring Steel Music Wire
450 Available Immediately | Further orders can be expected around Sat, Jul 12, 2025
$17.05 AUD
$17.05 AUD
Each
View the product page first if you are unsure.
Load
25.9
Newtons
+/- 10%
Band Length
1371.6
mm
Thickness (t)
0.508
mm
Band Width (W)
31.75
mm
Free ID (Ref. Only)
66.68
mm
Drum Diameter
80.3
1136834 | CFS-0259-1372-318-S1-TW --- Constant Force Springs - 25.9 Newtons - 1371.6x0.508 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Cycles Life: 20000    Mounting Holes: 1 mm    Initial Extension (f1): 120.7 mm    Max. Working Deflection (f2): 914.4   
Part Number: CFS-0259-1372-318-S1-TW Constant Force Springs - 25.9 Newtons - 1371.6x0.508 mm - Spring Steel Music Wire
44 Available Immediately | Further orders can be expected around Sat, Jul 12, 2025
$45.23 AUD
$45.23 AUD
Each
Load
25.9
Newtons
+/- 10%
Band Length
1371.6
mm
Thickness (t)
0.508
mm
Band Width (W)
31.75
mm
1136834 | CFS-0259-1372-318-S1-TW --- Constant Force Springs - 25.9 Newtons - 1371.6x0.508 mm - Spring Steel Music Wire
Material: Spring Steel Music Wire    Free ID (Ref. Only): 66.68 mm    Drum Diameter: 80.3    Cycles Life: 20000    Mounting Holes: 1 mm    Initial Extension (f1): 120.7 mm    Max. Working Deflection (f2): 914.4   
Part Number: CFS-0259-1372-318-S1-TW Constant Force Springs - 25.9 Newtons - 1371.6x0.508 mm - Spring Steel Music Wire
44 Available Immediately | Further orders can be expected around Sat, Jul 12, 2025
$45.23 AUD
$45.23 AUD
Each
View the product page first if you are unsure.