Custom Spring Product Family
Custom extension springs—also commonly called tension springs—provide return force as the spring body is pulled apart. End style, initial tension, body length and load at extension are defined together for the assembly.
Extension Springs
Custom Continuous-Length Extension Springs manufactured to your drawing, dimensions, load or torque, material, working environment and production requirements.
Extension Springs
Custom Cross-Over Loop Extension Springs manufactured to your drawing, dimensions, load or torque, material, working environment and production requirements.
Extension Springs
Drawbar spring assemblies that convert an external pulling movement into compression of an internal coil, specified as a complete load-bearing assembly.
Extension Springs
A compact end-hook extension spring suited to small linkages and constrained connections where the attachment needs to stay close to the coil body.
Extension Springs
An extension spring with a compact German-style hook profile used when the connection geometry needs more control than a simple round loop provides.
Extension Springs
Extension springs without conventional exposed hooks, specified around the actual end attachment and required tensile load.
Extension Springs
Custom Micro Extension Springs manufactured to your drawing, dimensions, load or torque, material, working environment and production requirements.
Extension Springs
An extension spring with an intentionally offset connection point for assemblies where the anchors do not line up with the coil centerline.
Extension Springs
Extension spring enquiries with reduced end coils or threaded attachment features, defined by the specific connection detail.
Extension Springs
An extension spring with simple round hooks for straightforward pin, hole or tab connections where the pull direction stays close to the spring axis.
Extension Springs
Extension springs with side-positioned hooks, specified by the attachment geometry, hook orientation and pull at installed lengths.
Extension Springs
Extension spring assemblies with movable attachment ends, defined by the fitting geometry, permitted rotation and working pull.
Product Family Overview
Extension springs store energy as the coils separate. In addition to the coil body, the hooks or loops are functional features that can control installation, alignment and fatigue life. The product pages above separate common end configurations so the attachment geometry can be reviewed before finalizing force and travel.
Selection
A tension spring can fail at the hook even when the body stress is acceptable, so the connection to the assembly should be defined early.
Round-hook designs are a practical starting point when the mating pin or hole can accept a conventional loop geometry.
Alternative hook forms change reach, orientation and stress concentration where the spring connects to the mechanism.
The required force before the coils begin to separate and the load at working extension should be specified independently of the free body length.
Custom Manufacturing Data
Engineering data covers a range of wire diameters and spring envelopes, while made-to-order designs can be reviewed outside the listed examples. Small extension springs need careful hook control; heavy-duty extension springs need enough space and attachment strength for the higher stored energy.
Custom RFQ
For a custom extension or tension spring, define the installed connection and force requirement rather than relying on overall length alone.
Project Support
Use the product pages for specific spring geometry, then continue with application, material, manufacturing or engineering information as needed.
Applications
Review where spring styles work well, assembly constraints and alternative designs.
View spring applications →Materials
Compare strength, corrosion, temperature, fatigue and conductivity before choosing a grade.
Compare spring materials →Manufacturing
See how forming, heat treatment, inspection, first articles and repeat production are reviewed.
View manufacturing capabilities →Engineering Data
Use material, wire-diameter and standard guides to support spring selection and drawing preparation.
Open Spring Engineering Guide →Continue with the material selection and design information related to this spring family.
CustomSprings Engineering Catalog
Choose the spring family and exact type first. Dimensional fields are optional and are used where that product family has comparable reference dimensions.
