The Hirobo HI2505003 kit supplies twenty M4 hexagon nuts made for RC helicopter general parts and small model work. These M4 threaded nuts are useful wherever an M4 connection is required, including frame joins, linkages and swashplate fittings.
Use these nuts as standard replacement fasteners during tuning and maintenance. Fit them with an M4 hex driver or socket, confirming thread alignment on mating bolts to avoid cross-threading and ensure proper seating.
When preparing a spares kit for flying sessions, include this pack with other frequently used fasteners to reduce downtime. Correct thread engagement and, when needed, a small amount of threadlocker will help prevent loosening from vibration and repeated use.
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