M2.5 mm screws are a standard screw size used in modular synthesizers for securing modules to a Eurorack case or mounting rails. They are most frequently used in ‘sliding nuts’ systems that have no fixed position in regards to screw location or separating distance.
These screws have a diameter of 2.5 mm and a thread pitch of 0.45 mm. They are typically made of stainless steel or another durable metal to ensure that modules are securely mounted and do not become loose over time.