Circular/Double Hook Tension Spring

Custom circular & double-hook tension springs — hooks on both ends, built to your load, length, and hook style.

A double-hook tension spring (also called a circular-hook or double-loop extension spring) has a hook or circular loop on each end, used to connect two components and pull them together under load. GL Springs manufactures custom double-hook and circular-hook tension springs to your exact load, free length, and hook configuration — in a wide range of materials and finishes, with samples available before mass production.

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Specifications

Circular vs. double-hook ends

The hooks transmit the spring's load, so the end style matters as much as the body:

• Circular (round) hooks — a closed, ring-shaped loop on each end for a clean, centered, secure connection; a popular choice where alignment matters.
• Double machine hooks — formed from the end coils on both ends; economical and widely used.
• Cross-over & side hooks — for balanced loading or to clear surrounding components.
• Custom hooks — bent to your exact drawing.

Tell us how the spring mounts and we'll recommend the right hook style for strength and assembly.

Applications

• Connecting and linking two components under tension
• Return and tensioning mechanisms
• Machinery, hardware, and assembly applications
• General pulling / axial-tension applications

Why choose GL Springs

• 20+ years (since 2005); ISO 9001 & IATF 16949 certified
• Wide material range — from carbon steel to Inconel / Hastelloy
• Fully custom — load, length, and hook configuration to your drawing
• Fast sampling — 7-day sampling, prototype to volume
• 100% inspection — dimensional and load testing against your spec

FAQ

What's the difference between a circular-hook and a double-hook tension spring?
"Circular hook" describes the round, closed-loop shape of the end; "double hook" means there's a hook on both ends. Many springs are both — round hooks on each end. We make all hook styles to your drawing.

What materials can you use?
Carbon, alloy, and stainless steels, plus copper alloys and nickel alloys (Inconel / Hastelloy) for special environments.

Do you provide samples?
Yes — 7-day sampling is available before mass production.

Get a quote

Send us your load, free length, and hook requirement — or a drawing or sample — and our engineers will recommend the optimal design with a fast quote.

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Part of our full range of custom extension springs.