RC M4x20 Hexagon Socket Head Cap Screw Set OS79871420 by O.S. Engine  [OS79871420]

Technical Notes: M4x20 Hex Socket Cap Screw

This 10 pcs pack of M4x20 hexagon socket head cap screws is suited to fastening engine mounts, small brackets, and other compact assemblies on scale RC models. The M4x20 size indicates a 4 mm thread diameter and 20 mm length, which helps when choosing replacements from a parts drawer.

These fasteners give reliable clamping for setups where consistent spacing and torque matter. Ensuring correct thread engagement and avoiding over-torquing helps protect tapped holes and nearby structural components. For high-vibration areas, confirm proper seating of the screw to preserve retention.

Installation pointers: make sure each screw fully engages the mating thread, replace screws that show head or thread damage, and keep a set of spares for emergency repairs. A 10-piece quantity is practical for modest rebuilds and periodic maintenance tasks.