How to use a big diameter shaft clamp (20mm+)

Clamping Large Diameters (Damper Bodies, Stanchions, etc.)

Working with large parts like damper bodies or stanchions requires a different approach than small shafts. Bad clamping habits here can lead to slipping, ovalisation, or subtle damage that only shows up later.

1. Clean Everything Thoroughly

Always clean both the clamp and the part you’re clamping with isopropyl alcohol one, two, even three times. If it’s been sitting on your bench or touched since cleaning, clean it again.

Pro tip: Lightly moisten the paper towel with isopropyl. It removes fine oil residue and significantly increases grip.
2. Wrap with Paper or Shop Towel

Wrap the part with a clean paper or shop towel before clamping. This improves grip, reduces the risk of slipping, and helps distribute clamping force without marking or damaging the surface.

3. Center in the Vise (Unless You Have a Very Good One)

Clamp the part as centered as possible in your vise, with the jaws gripping near the middle of the clamp.

Most vises are not perfectly rigid. Clamping off-center often causes the jaws to tilt under load, putting the part at an angle and reducing grip.

✔ High-end vise: If your vise does not flex or tilt under torque, slight off-center clamping is acceptable.

✘ For most setups: keep it centered.

4. Never Clamp Horizontally

Never clamp large-diameter parts horizontally in the vise. Even with wide jaws, the clamp will flex at the sides and the force will concentrate in the center only. This leads to poor grip and higher risk of deformation.

5. Protect Any Exposed Shaft

If a damper shaft sticks out of the body, make sure it does not rest on the vise base or any metal surface. One small scratch is enough to ruin a shaft.

6. Don’t Overdo the Clamping Force

With clean surfaces and a paper layer, you do not need excessive force. Tighten gradually and test.

If it slips, tighten slightly. If it still slips, clean everything again.

Torque is not the solution. Isopropyl alcohol and paper are.

Thanks for reading this guide. Attention to these details keeps your dampers safe and damage-free, and lets you work confidently.

⚠️ Disclaimer:

These guidelines are recommendations only. Improper clamping can cause damage and void warranties. By following these steps, you accept our Terms of Service.

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