O.S. Engine OS79871420 Hexagon Socket Head Cap Screw M4x20, 10 pcs pack for RC engine and accessory fastening  [OS79871420]

M4x20 Hexagon Socket Head Cap Screw

This 10 pcs pack of M4x20 hexagon socket head cap screws from O.S. Engine is presented as a scale RC accessory intended for securing engine mounts, accessory brackets, and small assemblies on model cars and boats. The M4x20 designation identifies the thread diameter and length for straightforward selection when replacing or stocking common fasteners used in RC engine parts and nearby fittings.

The product serves a practical role in setup and tuning by providing uniform clamping for components where consistent spacing and repeatable torque matter. Using matching thread engagement and avoiding over-tightening helps preserve tapped holes in engine mounts and nearby structural parts. For assemblies subject to vibration, ensure proper seat and engagement of the M4 thread for reliable retention.

Installation notes focus on fit and serviceability: verify each screw fully engages the mating thread, replace any screw that shows head or thread damage, and keep an inventory of spare fasteners for field repairs. The pack quantity of 10 pcs makes it suitable for small rebuilds and routine maintenance without introducing additional parts or tools in the product bundle.