World's First Climate Tech Platform | Free Delivery in India | Global Shipping

Become Seller

For Bulk Enquiry: sales@envmart.com

Shopping Cart $0.00

RS PRO Steel Extension Spring, 87.2 mm Free Length x 20 mm Outside Diameter, 757 N Initial Tension Model 121-400

Free Delivery in India | Lowest Global Shipping Charges

RS PRO Steel Extension Spring, 87.2 mm Free Length x 20 mm Outside Diameter, 757 N Initial Tension Model 121-400

Name: RS PRO Steel Extension Spring, 87.2 mm Free Length x 20 mm Outside Diameter, 757 N Initial Tension Model 121-400
Brand: RS PRO
SKU: 141596
Price: 10.77 USD
Availability: InStock



Category Extension Springs Brand RS PRO Condition New

Specifications

Country of Origin	United Kingdom
Brand	RS PRO
Material	Steel
Model	121-400
Outside diameter	20mm
Wire Diameter	4mm
Standards/Approvals	DIN 17223, RoHS, BS 1408 CR3
Free Length	87.2mm
Spring Rate	39.7N/mm
Maximum Extended Length	103.4mm
Initial Tension	757N

Key Features

Manufactured from high-strength steel music wire for durability and strength.
Features full twist loop ends for secure fastening.
Designed to deliver an initial tension force of 757 newtons.
Maximum extended length is 103.4 mm with a spring rate of 39.7 N/mm.
Operates reliably up to 121 °C (250 °F) with dry-to-touch oil finish for corrosion resistance.
Meets DIN 17223, RoHS, and BS 1408 CR3 standards for quality assurance.
Ideal for automotive engines, appliances, medical devices, electronics, and measuring instruments.

Product Description

RS PRO 121-400 Steel Extension Spring is engineered for robust performance in diverse industrial environments. With a free length of 87.2 mm and an outside diameter of 20 mm, this spring is crafted from highly magnetic steel music wire per ASTM A228, providing superior strength and longevity.

The spring features full twist loop ends that ensure secure fastening under dynamic load conditions. Designed to apply an initial tension of 757 newtons, it can extend to a maximum length of 103.4 mm, offering flexibility in applications requiring controlled tension and load absorption.

Its spring rate of 39.7 N/mm allows for precise mechanical response, making it suitable for use in automotive engines, household appliances, medical devices, electronics, and precision measuring instruments.

The extension spring withstands operating temperatures up to 121 °C (250 °F), protected by a dry-to-touch oil finish that enhances corrosion resistance without tackiness.

Compliance with DIN 17223, RoHS, and BS 1408 CR3 standards ensures this spring meets rigorous quality and safety benchmarks. Originating from the United Kingdom, it embodies trusted manufacturing excellence.

Manufactured from high-strength steel music wire complying with ASTM A228. Incorporates full twist loop ends for reliable attachment. Provides an initial tension force of 757 newtons for effective load handling. Operates reliably up to 121 °C with a protective oil finish for corrosion resistance.

Meets international quality standards including DIN 17223 and BS 1408 CR3. Suitable for industrial, automotive, medical, and electronic device applications.

This RS PRO extension spring is an essential component for mechanical power transmission, providing dependable and consistent tension performance. For industry professionals seeking quality springs conforming to international standards, RS PRO offers a reliable solution engineered for durability and precision.

Explore the complete range of industrial mechanical fasteners and Extension Springs at EnvMart for superior engineering and sustained operational excellence.