Park Tool 180 Lock Block Assembly

If your repair stand clamp is no longer holding its position or the arm rotation feels loose and unstable, the internal locking mechanism is likely worn out. The 180 Lock Block Assembly is designed to restore that firm, secure grip.

The 180 Lock Block Assembly is compatible with most standard Park Tool clamps, but compatibility can vary depending on the specific model and age of your stand. We recommend checking your repair stand's manual or the Park Tool website to confirm the 180 part number matches your specific clamp assembly.

Replacing the lock block is a straightforward maintenance task that most home mechanics can handle with basic hand tools. You will typically need to remove the clamp head from the stand to access the internal components, but the process is well-documented in Park Tool's online repair guides.

The 180 Lock Block Assembly includes the essential internal components required to restore the locking function. Depending on the condition of your current hardware, you may be able to reuse existing bolts, but it is always good practice to inspect your current screws for wear before reassembly.

If your clamp is slipping even when fully tightened, the internal teeth or locking surfaces are likely worn down. Replacing the lock block restores the mechanical integrity of the clamp, ensuring your bike stays securely in place without needing to overtighten the handle.