M3 x 4 Hexagon Button Bolt Hirobo HI2539023 Screw for Model Helicopters  [HI2539023]

M3 x 4 Hex Button Bolt Description

Supplied as a hexagon button head screw, Hirobo HI2539023 is intended for common maintenance tasks on RC helicopters and small assemblies. The M3 x 4 specification denotes a 3 mm thread diameter with a 4 mm length, a frequent choice for lightweight structural joints and accessory mounts.

Fit the bolt using a correct hex key and avoid excessive torque to prevent damage to mating parts. Its button head profile provides a tidy, low-profile finish that works well where clearance is limited or aesthetics matter.

Before installing, confirm that the receiving component accepts M3 x 4 fasteners and that there is sufficient thread engagement to form a reliable joint in your model helicopter.