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When your RC car, robotic arm, or miniature gearbox demands tight mesh tolerances and reliable torque transfer, a poorly fitted gear becomes the weakest link in the entire drivetrain. Hobbyists, makers, and small-scale mechanical engineers who need a dependable 0.5 module spur gear with a consistent 54-tooth count will find this brass pinion gear engineered to perform where plastic alternatives fail.
This 0.5 Mod spur gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength suited to light-to-medium load applications. The gear features a module of 0.5 (pitch diameter typically 27 mm / ~1.06 in) with 54 teeth, and is available in bore diameters of 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm to accommodate a wide range of shaft sizes. Face width is typically 5–8 mm (~0.20–0.31 in).
Typical use cases include RC car transmission stages requiring a 0.5 mod pinion spur gear replacement, desktop robotic joint assemblies using brass spur gears for low-noise operation, and DIY CNC or 3D printer extruder drives where a 54-tooth brass gear provides smooth, repeatable motion.
Machined from brass alloy for corrosion resistance, self-lubricating properties, and quieter mesh compared to steel gears in light-load applications.
Standard 0.5 Mod tooth profile ensures accurate meshing with any compatible 0.5 Mod counterpart gear, rack, or pinion in your drivetrain.
Choose from 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm bore to fit your shaft directly — no reaming required when the correct size is selected.
Available in 1 PCS, 2 PCS, or 5 PCS packs, making it easy to stock spares or outfit multiple axes in a single order.
Brass gear teeth deliver reduced operating noise and vibration versus sintered metal alternatives, ideal for precision desktop robotics and RC applications.
Standard 0.5 Mod, 54T geometry makes this a direct drop-in replacement for worn or broken spur gears in RC cars, servo gearboxes, and hobby CNC machines.
| Module | 0.5 |
|---|---|
| Number of Teeth | 54T |
| Pitch Diameter | 27 mm (approx. 1.06 in) |
| Outside Diameter | Typically 28 mm (approx. 1.10 in) |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm — See variant options |
| Face Width | Typically 5–8 mm (approx. 0.20–0.31 in) |
| Pressure Angle | 20° |
| Material | Brass |
| Finish | Natural brass (uncoated) |
| Gear Type | Spur (parallel axis) |
| Packing Quantity | 1 PCS / 2 PCS / 5 PCS — See variant options |
| Shaft Fit | Clearance fit; setscrew or keyway recommended |
Measure your shaft diameter with a caliper and select the matching bore option (4, 5, 6, 8, 10, or 12 mm). The bore is machined to a standard clearance fit. For a secure, wobble-free connection, use a setscrew, locking collar, or keyed shaft. Avoid selecting a bore larger than your shaft diameter.
Yes. Any gear with a 0.5 module and 20° pressure angle will mesh correctly with this 54T spur gear, regardless of tooth count. Verify that your mating gear is also 0.5 Mod before ordering. Module and pressure angle must match for proper engagement.
Brass is softer than steel, making it well-suited for light-to-medium loads, low-speed drives, and applications where noise reduction matters. For high-torque or high-speed applications, a steel spur gear would be more appropriate. Brass excels in RC cars, servo gearboxes, and desktop robotics where loads are moderate.
Brass has inherent corrosion resistance and mild self-lubricating properties, making it suitable for indoor and light-outdoor use without surface treatment. For extended service life, a light application of gear grease or white lithium grease on the tooth faces is recommended, especially in continuous-duty applications.
Yes. The 0.5 Mod, 54T profile is a common specification in RC car pinion/spur gear sets and servo gearboxes. Confirm the module, tooth count, and bore size match your existing drivetrain before purchasing. This gear is a direct replacement for worn 0.5 Mod 54T spur gears in these applications.
Order 1 PCS if you need a single replacement gear. Choose 2 PCS if you are building a mirrored or dual-axis system, or want one spare on hand. The 5 PCS pack offers the best per-unit value for prototyping multiple configurations, stocking a workshop, or outfitting a fleet of RC vehicles.
For a 0.5 Mod gear with 54 teeth, the pitch diameter is 27 mm and the outside diameter (addendum circle) is typically 28 mm (~1.10 in). Verify clearance in your housing before installation, as actual dimensions may vary slightly by manufacturer tolerance.
