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When a slipping or mismatched gear ruins your build mid-project, the frustration is real — especially for RC hobbyists, robotics engineers, and mechanical DIYers who need exact tooth engagement and a secure shaft fit. These 30T Mod1 steel pinion gears with set screw are engineered for builders who demand dimensional accuracy and repeatable performance across every drive system they assemble.
Each gear is machined from carbon steel, featuring 30 teeth at Module 1 (Mod1) pitch. The bore range spans 5 mm to 17 mm (approximately 0.197" to 0.669"), with three hub configurations available: standard round bore, key slot bore (for keyed shafts), and D-hole bore (for flat-sided motor shafts). An M3 set screw locks the gear firmly onto the shaft to prevent rotational slip under load.
These 30T Mod1 spur gears are well-suited for RC car and truck drivetrain upgrades, small servo and stepper motor gearbox assemblies, custom CNC router axis drives, and tabletop robotics platforms where a compact, straight-tooth gear ratio is required. The Mod1 tooth profile also makes them directly interchangeable with other Mod1 gears in mixed-brand gear trains.
| Number of Teeth | 30T |
|---|---|
| Module (Pitch) | Mod1 (Module 1) |
| Tooth Profile | Straight tooth (spur) |
| Material | Carbon steel |
| Bore Type | Round bore / Key slot bore / D-hole bore (see variant options) |
| Bore Diameter | 5 mm – 17 mm (0.197" – 0.669") — see variant options |
| Key Slot Dimensions | See variant options (e.g. 8×3×1.4 mm, 10×3×1.4 mm, 10×4×1.8 mm, 12×4×1.8 mm, 12.7×5×2.3 mm) |
| D-Hole Dimensions | See variant options (e.g. 6×5 mm, 8×7 mm, 10×9 mm) |
| Set Screw Thread | M3 |
| Outer Diameter (OD) | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 1 / 2 / 5 / 10 PCS (see variant options) |
Measure your motor or drive shaft diameter with a caliper. For a round shaft, select the matching round bore (e.g. 6 mm shaft → 6 mm bore). For a shaft with a flat side, choose the D-hole variant whose round dimension matches your shaft. For a keyed shaft, select the key slot variant and confirm the key width and height match your key stock.
Module (Mod) is the metric standard for gear tooth size. Mod1 means the pitch diameter in mm equals the number of teeth — so a 30T Mod1 gear has a 30 mm pitch diameter. Any two Mod1 gears will mesh correctly regardless of brand, as long as both are Mod1. Do not mix Mod1 with Mod0.8, Mod1.25, or other modules.
Yes, an M3 set screw (grub screw) is included with each gear. You will need a 1.5 mm or 2 mm hex key (Allen key) to tighten it. Apply a small amount of thread-locking compound if the gear will experience significant vibration or reversing loads.
These gears are machined from carbon steel, which provides solid strength for RC drivetrains, robotics, and light-to-medium mechanical drives. The actual torque capacity depends on face width, operating speed, and lubrication. For heavy industrial loads or continuous high-speed operation, contact us to confirm suitability before ordering.
Carbon steel can oxidize if exposed to moisture without protection. For outdoor or humid environments, apply a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives for your application.
Round Bore: A plain circular hole — the set screw alone holds the gear on the shaft. Suitable for smooth round shafts. Key Slot: The bore has a rectangular slot that accepts a standard key, providing positive rotational locking for keyed shafts. D-Hole: The bore has one flat side matching a D-shaped motor shaft (common on many DC and stepper motors), preventing rotation without a separate key.
You can order as few as 1 piece. Pack options of 1, 2, 5, and 10 pieces are available — multi-pack options offer a lower per-unit cost and are useful for stocking spares or building multiple identical drive stages.
