Koswork 3x40mm Button Head Hex Hardened Steel RC Screw - KOSBS340

The Koswork KOSBS340 is a pack of eight M3 x 40mm button head hex hardened steel screws designed for use in RC car builds and repairs. Koswork hardware is a common choice among kit builders and racers who need reliable fasteners for chassis assembly, body mounts, and component attachment. The button head profile sits flush and low, reducing snag points on moving parts, while the hardened steel construction resists stripping under repeated assembly and disassembly.

Key Features

• M3 x 40mm specification — suitable for deeper chassis or body mounting points that shorter M3 screws won't reach
• Button head hex drive reduces the risk of cam-out and provides a clean, low-profile finish once installed
• Hardened steel construction offers greater resistance to stripping compared to standard mild steel screws
• Pack of eight gives you spares on hand for full builds or repairs without needing to reorder immediately
• Compatible with standard M3 hex drivers and Allen keys commonly found in RC tool kits

What's Included

• 8 x Koswork M3 x 40mm button head hex hardened steel screws (KOSBS340)

What You Need

• M3 hex driver or Allen key (not included)
• Compatible RC car kit or chassis requiring M3 x 40mm fasteners