Extension Springs

An extension spring or tension spring is a length of tightly coiled metal, usually steel with hooks or loops at either end. Extension springs absorb and store energy.

What does it do?
An extension spring is a component that creates a resistance to a pulling force. Extension springs work by trying to pull two objects back together. The attached spring is pulled in opposite directions and the force and the stored energy to pull the two objects back together.

Types
Extension or tension springs selected by a few key attributes, they are:
  • Material – Steel or stainless steel

  • Free length - The overall length of the spring in its unloaded position
  • Max extended length – The length of the spring when it is fully extended
  • Outside diameter – The outside diameter of the springs coils
  • Wire diameter – The diameter of the metal used to make the spring
  • Spring rate – The force, quoted in N/mm
  • Max load – The load when the spring is at full extension

Uses

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Viewing 1 - 20 of 57 products
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Description Price Material Free Length Maximum Extended Length Outside Diameter Wire Diameter Initial Tension Spring Rate Ends
RS Stock No. 751-792
BrandRS PRO
£0.848
Each (In a Pack of 10)
Units
Steel 34.5mm 59.50mm 5mm 0.7mm 22.6N 0.77N/mm -
RS Stock No. 751-938
BrandRS PRO
£1.306
Each (In a Pack of 5)
Units
Steel 105mm 292.00mm 15mm 1.4mm 57.1N 0.26N/mm -
RS Stock No. 821-481
BrandRS PRO
£0.894
Each (In a Pack of 10)
Units
Stainless Steel 41.4mm 125.70mm 6mm 0.55mm 7.9N 0.08N/mm -
RS Stock No. 121-365
BrandRS PRO
£2.67
Each (In a Pack of 5)
Units
Steel 85.5mm 133.10mm 18mm 2.5mm 237N 4.27N/mm -
RS Stock No. 751-865
BrandRS PRO
£1.052
Each (In a Pack of 10)
Units
Steel 50mm 142.20mm 10mm 0.9mm 24N 0.23N/mm -
RS Stock No. 436-0570
BrandRS PRO
£5.46
Each
Units
- 254mm - - - - - -
RS Stock No. 121-416
BrandRS PRO
£6.357
Each (In a Pack of 3)
Units
Steel 109mm 128mm 25mm 5mm 1110N 49.7N/mm -
RS Stock No. 821-447
BrandRS PRO
£0.954
Each (In a Pack of 10)
Units
Stainless Steel 27.7mm 80mm 5.5mm 0.5mm 6.5N 0.11N/mm Looped
RS Stock No. 121-321
BrandRS PRO
£1.98
Each (In a Pack of 5)
Units
Steel 87.2mm 134.80mm 12mm 1.8mm 141N 2.52N/mm -
RS Stock No. 821-504
BrandRS PRO
£0.827
Each (In a Pack of 10)
Units
Stainless Steel 35mm 101.50mm 7mm 0.63mm 1N 0.13N/mm -
RS Stock No. 821-419
BrandRS PRO
£0.781
Each (In a Pack of 10)
Units
Stainless Steel 22.1mm 42.30mm 3.2mm 0.45mm 8.91N 0.407N/mm -
RS Stock No. 751-944
BrandRS PRO
£1.242
Each (In a Pack of 10)
Units
Steel 39.7mm 58.4mm 11mm 1.6mm 111N 5.02N/mm -
RS Stock No. 751-887
BrandRS PRO
£1.106
Each (In a Pack of 10)
Units
Steel 75.4mm 224.40mm 11mm 1mm 29.6N 0.17N/mm -
RS Stock No. 121-371
BrandRS PRO
£1.504
Each (In a Pack of 5)
Units
Steel 61mm 73.2mm 14mm 2.8mm 400N 27.9N/mm -
RS Stock No. 751-900
BrandRS PRO
£1.013
Each (In a Pack of 10)
Units
Steel 82.8mm 241.8mm 12mm 1.1mm 35.8N 0.2N/mm -
RS Stock No. 821-425
BrandRS PRO
£0.823
Each (In a Pack of 10)
Units
Stainless Steel 25mm 80.80mm 5mm 0.45mm 5.40N 0.09N/mm -
RS Stock No. 751-893
BrandRS PRO
£0.997
Each (In a Pack of 10)
Units
Steel 34.4mm 76.70mm 12mm 1.1mm 35.8N 0.72N/mm -
RS Stock No. 751-950
BrandRS PRO
£1.034
Each (In a Pack of 5)
Units
Steel 87.7mm 224.70mm 17mm 1.6mm 74N 0.46N/mm -
RS Stock No. 121-343
BrandRS PRO
£3.31
Each (In a Pack of 3)
Units
Steel 88.6mm 206.6mm 24mm 2.2mm 127N 0.92N/mm -
RS Stock No. 121-387
BrandRS PRO
£2.542
Each (In a Pack of 5)
Units
Steel 69.8mm 83.40mm 16mm 3.2mm 510N 31.8N/mm -
Related Products
Manufactured from high tensile strength piano/music wire, with ...
Description:
Manufactured from high tensile strength piano/music wire, with a right-hand (clockwise) helix and looped ends. Attached at both endsSprings absorb and store energyCreate resistance to pulling forceInitial tension manipulation can achieve individual requirementsWound to oppose extension.
Extension springs are coiled attached by two components ...
Description:
Extension springs are coiled attached by two components from both ends of the spring. When pulled apart the extension springs pull them back together again. The springs tension can be adapted depending on the applications load requirements. Absorb and store energyPulling force resistanceWound springs to oppose extensionAvailable in various sizes. ...