M4x20 Hexagon Socket Head Cap Screws 10 pcs - O.S. Engine OS79871420  [OS79871420]

Overview of M4x20 Hex Socket Cap Screws

This pack contains ten M4x20 hexagon socket head cap screws intended for securing engine mounts, accessory fittings, and compact assemblies on model vehicles and boats. The M4x20 specification identifies thread diameter and length to simplify spare selection and replacement.

Used correctly, these screws deliver uniform clamping where consistent spacing and repeatable torque are required. Avoid over-tightening to protect tapped holes in mounts and adjacent parts. For applications exposed to vibration, check seating and thread engagement to ensure reliable retention.

Practical advice: confirm each screw fully engages the mating thread, discard screws with damaged heads or threads, and keep a small inventory of spares for on-site repairs. The 10-piece quantity covers routine maintenance without excess spare hardware.