Koswork Mod 1 M1 18T Lightweight Hardened Steel RC Pinion Gear 5mm Shaft - KOS03006-18

The Koswork KOS03006-18 is a Mod 1 18-tooth hardened steel pinion gear designed for RC cars and buggies running a 5mm motor shaft. Built from hardened steel for durability under race conditions, this pinion is a direct-fit option for competitive and club-level RC racers looking for a reliable, long-lasting gear solution. The 18T tooth count makes it a popular choice for tuning acceleration and top speed balance on electric RC vehicles.

Key Features

• Mod 1 (M1) pitch — compatible with standard Mod 1 spur gears used across a wide range of 1/8 and 1/10 scale electric and nitro RC cars
• Hardened steel construction for extended wear life compared to standard steel pinions, particularly under high-load or high-rpm conditions
• 18-tooth configuration suits a range of gearing setups — lower tooth counts favour acceleration, while 18T offers a mid-range balance suited to mixed track conditions
• Designed for a 5mm motor shaft, which is the standard diameter on many brushless and brushed motors used in competition-grade RC cars
• Includes a high-torque set screw for a secure, slip-free fit on the motor shaft

Compatible With

• RC cars and buggies fitted with a 5mm motor shaft
• Mod 1 (M1) spur gear systems
• Brushless and brushed motors with 5mm shaft diameter
• Common in 1/8 scale and larger 1/10 scale RC platforms using Mod 1 gearing

What's Included

• 1x Koswork KOS03006-18 Mod 1 18T hardened steel pinion gear
• High-torque set screw (pre-fitted or included for installation on 5mm shaft)