How to Mate a Spring in SOLIDWORKS

Mating a spring in SOLIDWORKS usually means positioning it between two parts while allowing the assembly to show the correct location and orientation. A simple spring model can be mated with concentric, coincident, distance, or path-related references depending on how much motion you need.

Use simple references

If the spring only needs to sit in place, add reference planes, axes, or circular end faces that make mating easy. A center axis through the spring is often the most useful reference because it can be mated concentrically to a shaft, pin, or guide.

When modeling the spring yourself, add reference geometry before saving the part. A spring made only from a helix and sweep can be awkward to mate if it has no clear axis, end planes, or reference points.

Add the main mates

1. Insert the spring into the assembly.
2. Add a concentric mate between the spring axis and the shaft or guide.
3. Add a coincident or distance mate to locate one end of the spring.
4. Use another distance mate if the compressed length must be shown.
5. Rebuild and move the surrounding components to check the result.

Decide whether the spring needs to move

A static spring model is often enough for drawings and BOMs. If you need motion, consider using configurations for compressed and extended states, or use a simplified representation that updates with assembly positions.

A fully flexible coil that changes shape dynamically can be more complex than the assembly needs. Use the simplest spring behavior that communicates the design clearly.

For many assemblies, two or three configurations are enough: free length, installed length, and fully compressed length. That gives reviewers useful states without making the model unstable.

Control spring length

If the spring must show a specific installed length, create configurations or dimensions for free length and compressed length. Then choose the correct configuration in the assembly. This keeps the spring predictable and avoids unstable mates.

Use distance mates to locate the ends only when the spring body is meant to remain at that displayed length. If the surrounding mechanism moves, make sure those mates do not fight the mechanism mates.

Check the surrounding components

A spring mate setup is only useful if the spring sits correctly against washers, pockets, pins, or seats. Section the assembly or temporarily hide nearby parts to confirm the ends of the spring are located where they should be.

If the spring is only a purchased component, you may not need exact coil geometry. A simplified cylinder or lightweight spring representation can keep large assemblies faster.

Troubleshooting

If the spring flips or moves unexpectedly, add a plane mate or angle reference to control orientation. If it becomes over-defined, remove duplicate distance or coincident mates and keep only the references that locate the spring clearly.

If rebuilds become slow, suppress detailed spring geometry in a simplified configuration and use the detailed spring only for close-up views or final drawings.