Industrial Compression & Extension Springs

Identify whether your spring compresses under load or stretches between hooks. Send an unloaded sample’s dimensions, the equipment model, and the quantity you need. An original drawing or unworn spare helps when the old spring has taken a set.

Request a quote Browse matching parts

Open-coil steel compression spring beside a close-wound extension spring with hooks — Illustrative product image

How to measure compression and extension springs

Measure wire diameter and coil outside diameter separately. For compression springs, measure unloaded length between the ends and note total coils and end style. For extension springs, measure between the inside hook bearing surfaces and record the coiled body length, hook openings, and orientation. Identify the reference points on your drawing.

Where to measure

Reference drawings. Verify dimensions on your part or the manufacturer’s drawing.

Compression spring free length and diameters

Use an unloaded spring. Measure end to end and across the outside of the coils. Measure one wire across its own cross-section, away from a ground end.

Extension spring hook-to-hook and body length

With no load, measure between the inside bearing surfaces of the hooks. Measure the coiled body separately and note hook shape and orientation at both ends.

What to include in a spring replacement quote

Send the material, finish, spring rate or load at a known working length if specified. For extension springs, include any specified initial tension. Note the spring’s operating travel and any temperature, corrosion, or washdown requirements.

See the machine hardware measurement guide.

Manufacturer references Lee Spring compression spring measurements and extension spring measurements