RS PRO Steel Extension Spring, 87.2mm x 20mm
- RS Stock No.:
- 121-400
- Brand:
- RS PRO
Subtotal (1 pack of 3 units)*
£17.31
(exc. VAT)
£20.76
(inc. VAT)
FREE delivery for orders over £50.00
In Stock
- Plus 243 unit(s) shipping from 27 October 2025
- Plus 90 unit(s) shipping from 27 October 2025
- Plus 999,999,756 unit(s) shipping from 15 December 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units | Per unit | Per Pack* |
|---|---|---|
| 3 + | £5.77 | £17.31 |
*price indicative
- RS Stock No.:
- 121-400
- Brand:
- RS PRO
Specifications
Technical Reference
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
|---|---|---|
| Brand | RS PRO | |
| Material | Steel | |
| Free Length | 87.2mm | |
| Maximum Extended Length | 103.4mm | |
| Outside Diameter | 20mm | |
| Wire Diameter | 4mm | |
| Initial Tension | 113.86N | |
| Spring Rate | 39.7N/mm | |
Select all | ||
|---|---|---|
Brand RS PRO | ||
Material Steel | ||
Free Length 87.2mm | ||
Maximum Extended Length 103.4mm | ||
Outside Diameter 20mm | ||
Wire Diameter 4mm | ||
Initial Tension 113.86N | ||
Spring Rate 39.7N/mm | ||
- COO (Country of Origin):
- GB
RS PRO Steel Extension Spring
Get the power you need with RS PRO Extension Spring! This heavy-duty extension spring is perfect for any application, no matter the load capacity or operating temperature. It's made of highly magnetic steel music wire for up to 757.0 newtons of force and can operate up to 250°F (121°C). Plus, its oil finish is dry to the touch for extra corrosion resistance. Get the reliable performance you need with RS PRO Extension Spring!
How do they work?
Extension springs are coils 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 application load requirements.
Why would you choose RS PRO for Extension springs?
Extension springs are often the least expensive part of your assemblies, failure can mean costly machine downtime and product rejects. To ensure quality and longer reliability RS PRO offer a range of steel extension springs with various spring rates and length to suit your application.
Features and Benefits
- Highly magnetic steel music wire per ASTM A228 for greater strength than stainless steel
- Full twist loop ends for secure fastening
- Load capacity of 757.0 newtons
- Maximum operating temperature of 250 degrees F (121 degrees C)
- Dry to the touch oil finish for added corrosion resistance
Application
- Automotive engines
- Appliances
- Medical devices
- Electronics
- Measuring instruments
Standards
Materials to DIN17223 Class C or BS1408 CR3. Dimensions conform to DIN2097 Grade 2. Oiled finish.
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