Compression vs Extension Springs: Key Differences
Compression springs push; extension (tension) springs pull. Compare fatigue risk, cost, and load response, then use our checklist to spec the right spring.
Technical Insights & Industry Solutions for Precision Bearings

Compression springs push; extension (tension) springs pull. Compare fatigue risk, cost, and load response, then use our checklist to spec the right spring.

What is a Compression Spring? Discover how they work, essential design formulas, materials, and applications in this comprehensive engineering guide. Read now!

A constant force spring is a coiled flat strip that keeps the same radius of curvature as it unwinds, producing a flat force curve over long travel unlike a round-wire extension spring governed by Hooke’s Law. Proper drum mounting is critical: the drum diameter should be 10–20% larger than the natural coil diameter, with at least 1.5 wraps remaining at full extension to prevent kinking, set loss, and reduced cycle life. Load is governed by strip material, width, thickness, and natural radius, with force scaling roughly with thickness cubed, while guided travel and correct end configurations help avoid buckling and fatigue issues. Common uses include counterbalances, cable and hose retractors, tool-head return systems, cabinet closers, fitness resistance mechanisms, and retail product dispensers where steady linear force is required.

Learn what springs are made of and how they're manufactured — from music wire selection and CNC coiling to heat treatment, shot peening, and load testing.

Ranked by engineers: top 10 spring manufacturers of 2026. Compare tolerance data, lead times & materials for aerospace and automotive.

No single person invented the spring. Meet Richard Tredwell, who patented the first coil spring in 1763, and Robert Hooke, whose law still governs spring design today.

What are springs? Explore 10 industrial springs like wave and die springs. Learn how they store energy and why the right material ensures machine reliability.
