Extension Springs

An extension spring also known as tension spring is a length of tightly coiled metal, usually stainless steel with hooks or loops at either end.

How Extension Springs Work

Extension springs operate through initial tension that holds their coils tightly together. When a pulling force is applied, the spring stretches and stores mechanical energy within the coils. As the load is released, the spring contracts, exerting an opposing force that draws the connected parts back together. This simple yet effective mechanism makes extension springs ideal for applications where controlled resistance and consistent tension are required.

Types of Extension Springs

Extension springs come in various types and configurations to suit specific performance needs:

By Load Strength

• Heavy-Duty Extension Springs: Designed for demanding industrial loads and repeated tension cycles.
• High-Tension Springs: Provide maximum resistance and durability for precision or high-load applications.

By Material

• Stainless Steel Extension Springs: Corrosion-resistant and ideal for outdoor or marine environments.
• Carbon Steel Springs: Offer excellent strength and value for general-purpose industrial use.

By End Type

• Hook Ends: Standard option for quick installation and easy connection.
• Loop Ends: Available in various shapes (German, extended, or reduced) for secure attachment to different components.

By Application Grade

• Industrial Extension Springs: Built for manufacturing and mechanical systems requiring long service life.
• Automotive Extension Springs: Used in vehicle and machinery components to maintain stable tension and motion.

Applications of Extension Springs

Extension springs are used in a wide range of industries and mechanical systems, providing reliable tension and return force.

• Automotive and Transport: Used in vehicle suspensions, throttle controls, and brake assemblies to absorb movement and maintain component tension.
• Industrial Equipment: Provide controlled resistance in machinery, conveyor systems, and manufacturing tools to ensure stable performance.
• Consumer Appliances: Common in washing machine drums, garage doors, and lever mechanisms where a return motion is required.
• Recreation and Fitness: Used in trampolines and exercise equipment to create controlled rebound and elasticity.
• Locking and Latching Systems: Found in locking mechanisms and tensioned closures that require components to stay securely fastened.

How to Choose the Right Extension Springs

When selecting extension springs, consider:

• Load Requirements: Determine the required force and spring rate (N/mm).
• Material: Choose stainless steel for corrosion resistance or carbon steel for high strength.
• Size and Length: Match the free, maximum extended, and large spring lengths to your system’s specifications for optimal fit and performance.
• End Configuration: Ensure compatibility with your mounting points.
• Operating Environment: Consider factors like temperature, moisture, and exposure to chemicals.

How to Install Extension Springs

When installing an extension spring, ensure the spring is securely attached to both components and operates within its designed load range. Avoid overstretching the spring beyond its maximum extended length, and install using appropriate hooks or fasteners to prevent slippage or damage. Regular inspections for wear and corrosion help maintain consistent spring performance and safety.

Buy Extension Springs Online from RS Australia

RS is a trusted manufacturer, supplier, and distributor of extension springs in Australia, offering products from leading brands including RS PRO, Knipex, Pressmaster, and more. Our range features stainless steel, heavy-duty, and industrial-grade extension springs, all engineered for precision and durability at competitive prices.

Ordering online is quick and secure — browse the product range, compare specifications, and add your chosen tension spring to the cart. RS also offers complementary categories such as compression springs, retaining clips, and fasteners to support your full mechanical setup.

RS provides fast, nationwide delivery across Australia for all spring and mechanical products. For more information on shipping times, coverage, and service fees, please visit our Delivery Information page.