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RS PRO Stainless Steel Extension Spring 27.7 mm Free Length 5.5 mm Outside Diameter 821-447

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RS PRO Stainless Steel Extension Spring 27.7 mm Free Length 5.5 mm Outside Diameter 821-447

Name: RS PRO Stainless Steel Extension Spring 27.7 mm Free Length 5.5 mm Outside Diameter 821-447
Brand: RS PRO
SKU: 137331
Price: 1.06 USD
Availability: InStock

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Category Extension Springs Brand RS PRO Condition New

Specifications

Country of Origin	United Kingdom
Brand	RS PRO
Material	Stainless Steel
Model	821-447
Outside diameter	5.5mm
Wire Diameter	0.5mm
Standards/Approvals	DIN 17223, RoHS, BS 1408 CR3
Free Length	27.7mm
Spring Rate	0.11N/mm
Maximum Extended Length	80mm
Initial Tension	6.5N
RS PRO Stainless Steel Extension Spring, 25 mm x 5 mm ODBrand	RS PRO

Key Features

Constructed from high-quality stainless steel for durability and corrosion resistance.
Free length of 27.7 mm with a maximum extended length of 80 mm.
Wire diameter is 0.5 mm, ensuring optimal strength and flexibility.
Initial tension force of 6.5 N and spring rate of 0.11 N/mm.
Designed to absorb and store energy for pulling force resistance applications.
Commonly used in automotive interiors and exteriors, garage doors, and industrial machinery.
Conforms to DIN 17223, RoHS, BS 1408 CR3 standards guaranteeing quality compliance.
Manufactured to DIN 2097 (Grade 2) with looped ends and right-hand helix.

Product Description

RS PRO 821-447 stainless steel extension spring features a free length of 27.7 mm and outside diameter of 5.5 mm, engineered for applications requiring resistance to pulling forces and energy absorption. Made from stainless steel, this spring combines excellent corrosion resistance and mechanical strength suitable for extended use in tough environments.

With a wire diameter of 0.5 mm, an initial tension of 6.5 N, and spring rate of 0.11 N/mm, this extension spring offers reliable performance in assemblies such as automotive components, garage door mechanisms, washing devices, farm machinery, and vice-grip pliers. The loop ends and right-hand helix design allow easy installation and consistent elasticity.

The spring adheres to DIN 17223, RoHS directives, and BS 1408 CR3 standards, ensuring high manufacturing quality and safety compliance. Dimensions conform to DIN 2097 (Grade 2), guaranteeing compatibility across technical applications requiring standardized parts.

Manufactured in the United Kingdom, it meets stringent quality control to provide durable and long-lasting mechanical fasteners for industrial, commercial, and automotive usage. Constructed from stainless steel for enhanced durability and corrosion resistance.

Features a free length of 27.7 mm and maximum extension of 80 mm. Wire diameter of 0.5 mm with a spring rate of 0.11 N/mm supports mechanical resilience. Initial tension of 6.5 N to maintain stable pulling force resistance.

Loop ends with right-hand helix design for secure attachment. Applicable for automotive interiors/exteriors, garage doors, farm machinery, and consumer devices. Adheres to DIN 17223, RoHS, BS 1408 CR3, and DIN 2097 standards.

Originated from the United Kingdom, ensuring compliance with European manufacturing norms. Explore the range of RS PRO industrial fasteners and Extension Springs at EnvMart for quality and reliability.