Extension Springs

Extension springs provide pulling tension as a mechanism moves or returns to position. This category includes general-purpose springs for OEM assembly, equipment maintenance, replacement work, and industrial projects involving light- to medium-duty, non-critical equipment.

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Helpful Buying Guide

Extension Spring Buying Guide

Choose an extension spring by matching the dimensions and spring rate required for the existing equipment or assembly. The available selection includes compact and longer springs in 302 stainless steel, zinc, and zinc-plated options, with single-spring and multi-pack quantities for replacement stock or project needs.

Visual Guide

Popular examples in this category

Zinc Extension Spring, 0.84 in. OD x 8 in. Overall Length, Pack of 3Zinc Extension Spring, 0.84 in. OD x 8 in. Overall Length, Pack of 3WBB2101528302 Stainless Steel Extension Spring, 0.84 in. OD, Pack of 3302 Stainless Steel Extension Spring, 0.84 in. OD, Pack of 3WBB2101393302 Stainless Steel Extension Spring, 0.375 in. OD, Pack of 6302 Stainless Steel Extension Spring, 0.375 in. OD, Pack of 6WBB2101526302 Stainless Steel Extension Spring, 1/4 in. OD, Pack of 6302 Stainless Steel Extension Spring, 1/4 in. OD, Pack of 6WBB2101547
Use Cases

Replacement and maintenance spring needs

These general-purpose extension springs are suited to replacement work, maintenance inventory, OEM assemblies, and industrial projects involving light- to medium-duty equipment.

How to Choose

Match the stated requirements

Compare outside diameter, overall length where listed, wire diameter where listed, and spring rate with the requirements of the application before ordering.

Applications

Pull and return mechanisms

Extension springs provide tensile force for mechanisms that need pull and return action, including compatible non-critical equipment and assemblies.

Additional Info

Consider material and quantity

Available options include 302 stainless steel, zinc, and zinc-plated springs. Package quantities range from one spring to packs of 3, 6, or 12.

0.25–0.96 in.Outside diameter range

Listed options span compact to larger outside diameters.

2–8 in.Listed overall lengths

Shown lengths include 2, 2.25, 4, and 8 inches.

1.08–15.69 lb./in.Spring-rate range

Compare the stated rate with the application requirement.

1–12Springs per package

Available quantities include single springs and packs of 3, 6, or 12.

Comparison Guide

Compare the available extension spring options

Use this overview to narrow choices by the material or finish specified, the sizes represented, and package quantity.

Selection factor302 stainless steel optionsZinc and zinc-plated options
Construction or finish302 stainless steelZinc or zinc-plated finish
Outside diameters represented0.25, 0.312, 0.375, 0.73, and 0.84 in.3/8, 0.5, 0.58, 0.84, and 0.96 in.
Package quantities representedSingle spring, packs of 3, and packs of 6Packs of 3 and 12
Planning Guide

Plan the right fit before choosing

Start with fit

Verify the spring’s physical dimensions

Outside diameter and overall length are key comparisons when replacing an existing extension spring or fitting a spring within a limited space. The listed options range from compact 0.25 in. outside-diameter springs to 0.96 in. outside-diameter springs. Overall lengths shown include 2 in., 2.25 in., 4 in., and 8 in.; one 4 in. option also lists a 0.1055 in. wire diameter, while a 2.25 in. option lists a 0.0348 in. wire diameter.

  • Match outside diameter to the available installation space.
  • Compare the listed overall length to the existing spring or assembly requirement.
  • Use wire diameter when it is specified for the spring being considered.
Compare spring action

Select the stated spring rate needed

Spring rate is a central selection factor for an extension spring. The products represented here list rates from 1.08 lb./in. to 15.69 lb./in., including compact options and longer 8 in. springs. Select a spring only when its stated rate aligns with the application requirement.

  • A 1.08 lb./in. rate is listed on a compact 0.375 in. OD, 2.25 in. spring.
  • Rates of 2.14, 2.36, 2.59, 3.14, 4.44, 7.19, 7.44, 8.01, 14.23, and 15.69 lb./in. are also represented.
  • Do not substitute a rate without confirming the needs of the equipment or assembly.
Plan quantity and material

Choose the construction and pack size that fit the job

302 stainless steel options are represented across several compact and larger extension-spring sizes. Zinc and zinc-plated choices provide additional general-purpose options. For a single replacement, one 0.73 in. OD by 8 in. spring is available; for inventory, repeated replacements, or project work, packs of 3, 6, and 12 are represented.

  • Choose 302 stainless steel when that specified construction is required.
  • Choose zinc or zinc-plated options when those listed finishes match the replacement need.
  • Match pack quantity to the number of replacements or installations planned.
FAQ

Common questions before buying

What do extension springs do?

They provide pulling tension as a mechanism moves or returns to position.

What dimensions should I compare?

Compare the listed outside diameter and overall length, plus wire diameter when it is provided.

What spring rates are available?

The represented products list rates from 1.08 lb./in. to 15.69 lb./in.

What pack sizes are represented?

The selection includes one spring and packs of 3, 6, or 12 springs.

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