20mm Outer Diameter Spacer

Longer bolts hold their preload much better under thermal expansion and cycling, which is where a heavy standoff spacer earns its keep. Sliding over an M10 bolt shank, this 25 mm tall zinc-flake coated spacer adds effective stretch length to the joint while serving as a dead-flat stand-off between bolted brackets. The zinc flake finish keeps rust from seizing things up when you need to tear it down later.