This is the cylinder head screw for the UMS 5-55cc engine, the five-cylinder 55cc four-stroke radial from UMS.
The part itself is the cylinder head screws that clamp the head to the barrel.
Why it is replaced: these are high-torque fasteners and are commonly replaced when they show stretched threads or corrosion, or simply on a full overhaul. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Torque in a diagonal sequence and in stages, and follow the factory figure.
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