Hexagon Button Bolt M3 x 25 Hirobo HI2539018 for RC Helicopter  [HI2539018]

Precision Button Head Fastener

The M3 x 25 hexagon button bolt serves as a compact fastening solution for RC helicopter frames and ancillary fittings. Its button head offers limited protrusion, helping avoid interference with adjacent components.

Installation is straightforward: employ the matching hex driver to protect the socket, hand-start the thread to ensure correct alignment, and tighten only to a conservative torque to prevent stripping delicate M3 threads. For a stronger hold use minimal threadlocker, keeping in mind the need for later removal if required.

These bolts play a small but important role in assembly integrity, reducing slop at joints and aiding trim stability. Regularly check and resecure fasteners after initial operation and during scheduled checks to keep handling predictable.