Hirobo HI2538011 Countersunk M3 x 30 Screw Set 10pcs  [HI2538011]

Countersunk Screw Specification for Model Helicopters

The Hirobo HI2538011 is a pack of ten M3 x 30 countersunk Phillips disk screws intended for model helicopter assembly and maintenance. The countersunk head and stainless-style finish let rotorhead components and airframe plates sit level and help prevent unwanted contact with nearby moving parts.

These screws are recommended where a recessed head is needed to avoid interference with rotating components or linkages. The Phillips drive matches common modelling tool sets and the countersunk disk head gives a wider bearing surface to lower localized stress on plastic or composite mounting surfaces.

Fitting recommendations: insert the screw into a correctly countersunk hole and start by hand to prevent cross-threading, then use an appropriately sized Phillips screwdriver and tighten until secure while avoiding over-torque that can damage M3 threads in softer substrates. For repairs and tuning, replace identical-length screws as a group to retain correct geometry and balance across paired items.