BGM ORIGINAL stud bolt for fastening the cylinder and cylinder head to the engine housing

PASSENGER
Suitable for Vespa largeframe engines from 160ccm displacement (ex works), e.g. Vespa PX200, Rally180/200, GS160, SS180, Cosa200, also suitable for Lambretta Series 1-3 engines.

SPECIALITIES

ROLLED THREAD
The thread of the cylinder stud bolts is rolled, not cut.
Thus the BGM ORIGINAL stud bolts have a very high tensile strength.

DIFFERENT DIAMETERS
Another special feature is the different core diameter of the threads. The side that is screwed into the engine housing has a slightly larger core diameter than the cylinder head side. This oversize allows the bolts to be screwed into the engine housing somewhat tighter. Thus they always remain in the housing when loosening the cylinder head nuts and do not rotate.

The side that should face the cylinder head is marked with a narrow groove.

(US)