Koswork 4x20mm Flat Head Hex Hardened Steel RC Screw - KOSFS420

The Koswork KOSFS420 is a pack of eight M4 x 20mm flat head hex hardened steel screws designed for use in RC car builds and repairs. Flat head hex screws are commonly used where a flush or countersunk fit is needed, making them a practical choice for securing body panels, chassis components, and structural parts where a protruding screw head would cause clearance issues. Hardened steel construction gives these screws greater resistance to stripping and shearing compared to standard mild steel fasteners, which matters when working with components that are tightened frequently or subject to vibration during running.

Key Features

• M4 x 20mm specification — check your existing screw dimensions before ordering to confirm fitment
• Flat head hex drive profile for countersunk installations where a flush surface is required
• Hardened steel construction for improved resistance to cam-out and thread stripping
• Pack of eight screws, useful for batch replacements or building multiple assemblies at once

What's Included

• 8x Koswork M4 x 20mm flat head hex hardened steel screws (KOSFS420)

What You Need

• Appropriate hex (Allen) key or driver to suit M4 flat head hex screws
• Verify your vehicle or kit requires M4 x 20mm flat head screws before ordering