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

Compact Hex Button Head Bolt

This M3 x 25 hexagon button bolt is intended for scale RC helicopter assemblies and similar small-model fittings. The rounded button head keeps the profile low so it clears nearby parts while keeping joints secure.

Fit the bolt using a proper hex driver and begin threading by hand to ensure alignment. Avoid over-torquing to protect M3 threads in lightweight components. For semi-permanent installs, a light threadlocker may be used, but remember to allow for future servicing if needed.

When tuning or repairing models, these bolts help maintain tight, accurate joins. Inspect and re-tension hardware after initial operation and as part of scheduled maintenance to prevent looseness and preserve handling consistency.