M7 x 155 rolled studs in special nickel chromium molybdenum steel with heat treatment.

very high resistance to hot stretching,

strength 10.9 (100N / mm²).

EN 10204 – 3.1 certification

The kit includes 4 studs

indispensable for mounting cylinders with a stroke greater than the original 51mm, or connecting rods longer than the original 97mm or under-cylinder bases to increase the stages.

Technical data:

The threaded part is M7 in tolerance 6g, while the central shank is 7mm in diameter against 6.2 / 6.3 of the standard rolled studs.

The greater section of the central shank produces benefits in terms of stability to stretch.

PLEASE NOTE!!! The through holes on the cylinders for the M7 studs must be 7mm. However, in some cases such as QUATTRINI cylinders, the holes for the passage are made from 6.9mm instead of 7mm.

Before installing the cylinder, check that the stud slides freely on the dedicated hole.

To restore the correct passage it is necessary to re-drill the holes with a 7 / 7.1mm bit before installing the thermal unit.

For all cylinders FALC, PARMAKIT, Polini, Pinasco, Malossi etc. the M7 studs fit perfectly.


Our complete engines are also available. Some ready for delivery, others customizable by reservation with delivery in about 30 days.

Other racing components and complete engines on request are: Falc, Malossi, Polini, Bfa and many others. For any request, do not hesitate to contact us by email at or by phone / whatsapp at +393755789138.

If you have questions about our products, direct assistance is always available via whatsapp or by call. We will be available to clarify any doubts.