Hirobo HI2539023 Hexagon Button Bolt M3 x 4 for RC Helicopter Parts  [HI2539023]

Hirobo M3 x 4 Button Bolt Details

This is an RC-scale hexagon button bolt offered under Hirobo HI2539023, made for general helicopter parts and small-assembly fastening. The M3 x 4 marking indicates a 3 mm thread diameter with 4 mm length, a size commonly used in model helicopter structural and accessory joints.

Installation is straightforward: use an appropriately sized hex driver to seat the button head without over-torquing, and confirm alignment of mating parts before final tightening. The low-profile head suits linkages, brackets, and small mounts where clearance is limited.

Compatibility depends on the target accepting M3 x 4 fasteners; always verify thread engagement and clearance on the component before fitting to ensure a secure connection in your RC helicopter model.