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Finding a 58-tooth Mod 0.5 pinion gear that fits your motor shaft without custom machining is a recurring challenge for robotics engineers, RC builders, and automation hobbyists. This 0.5 Mod brass spur gear with 58 teeth is stocked in eight bore sizes — from 4 mm to 15 mm — so you can match your motor shaft directly without adapters or rework.
The gear is machined from brass alloy, delivering smooth involute tooth meshing, moderate corrosion resistance, and low operating noise. Module is 0.5, tooth count is 58T, giving a pitch diameter of 29 mm (approximately 1.14 in). Bore options span 4, 5, 6, 8, 10, 12, 14, and 15 mm (approximately 0.16–0.59 in). Face width is typically 5–8 mm depending on bore variant.
Typical applications include: small DC and stepper motor gearboxes in robotics and automation where a 0.5 mod 58T reduction stage is needed; RC car and truck drivetrain pinion replacement where brass-on-brass or brass-on-plastic meshing reduces noise; and DIY CNC axis drives, camera pan/tilt rigs, and precision instrument mechanisms where consistent tooth engagement and low backlash are essential.
Standard 0.5 module, 58-tooth involute profile. Pitch diameter 29 mm (1.14 in) for straightforward gear ratio calculations and direct interchangeability with any Mod 0.5 system.
Brass provides smooth, low-noise tooth engagement and adequate corrosion resistance for indoor and light-duty environments — without the maintenance demands of bare steel gears.
Bore options of 4, 5, 6, 8, 10, 12, 14, and 15 mm cover the most common small motor shaft diameters, eliminating the need for custom boring in the majority of applications.
Precision-cut involute teeth minimize backlash and ensure consistent, smooth power transmission across the full rotation cycle — critical for position-sensitive robotics and CNC builds.
Multi-piece packs offer a lower per-unit cost — ideal for prototyping multiple axis configurations, building spare parts inventory, or equipping multi-motor drive systems.
Conforms to DIN/ISO Mod 0.5 gear geometry, making it a direct drop-in replacement for worn or damaged 58T pinion gears in existing drive trains without system redesign.
| Module | 0.5 |
|---|---|
| Number of Teeth | 58T |
| Pitch Diameter | 29 mm (1.14 in) |
| Pressure Angle | 20° |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 / 14 / 15 mm — See variant options |
| Gear Width (Face Width) | Typically 5–8 mm (0.20–0.31 in) |
| Material | Brass |
| Finish | Natural brass (uncoated) |
| Gear Type | Spur gear (external) |
| Tooth Profile | Involute |
| Pack Quantity | 1 PCS / 2 PCS / 5 PCS — See variant options |
| Application | Motor pinion, transmission, robotics, RC, CNC |
Measure your motor shaft diameter precisely with a caliper and select the matching bore variant. For example, a 6 mm shaft requires the Bore 6 mm option. A bore that is too large will cause shaft slippage under load; a bore that is too small will not fit. If your shaft has a D-cut flat, plan to secure the gear with a set screw or shaft collar after fitting.
Any standard Mod 0.5 external spur gear meshes with this gear regardless of tooth count, as long as both share the same module (0.5) and pressure angle (20°). It also meshes with Mod 0.5 racks for linear motion conversion. Do not attempt to mesh with gears of a different module — tooth profiles will not engage correctly.
Brass is well-suited for light-to-medium duty applications including robotics, RC vehicles, camera rigs, and small automation systems. It handles the torque loads typical of small DC and stepper motors reliably. For continuous heavy-load or high-RPM industrial duty cycles, a steel or hardened alloy gear may offer longer service life.
The 58T gear has a pitch diameter of 29 mm versus 30 mm for the 60T. This gives a slightly different gear ratio when paired with the same driver pinion. For example, a 58T driven gear paired with a 12T driver gives a 4.83:1 reduction, compared to 5:1 for a 60T. Choose 58T when your system requires that specific ratio or when physical space constraints favor the slightly smaller pitch diameter.
Brass offers moderate natural corrosion resistance and performs reliably in dry indoor environments. For applications with occasional light moisture exposure, applying a thin coat of machine oil or grease to the tooth faces provides adequate protection. Avoid prolonged exposure to saltwater or strongly acidic environments without additional protective coating.
Brass-on-brass or brass-on-plastic meshing can operate dry at low speeds and light loads. For extended service life and reduced tooth wear, applying a light machine grease or PTFE-based lubricant to the tooth faces is recommended — especially under continuous duty or at higher rotational speeds.
The 1-piece pack is ideal for single-axis builds or one-off replacements. The 2-piece pack suits dual-motor setups or a primary gear plus one spare. The 5-piece pack offers the lowest per-unit cost and is the practical choice for prototyping multiple configurations, stocking a spare parts kit, or equipping multi-axis systems.
