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When backlash, noise, and premature wear are costing you precision in your build, the right pinion gear makes all the difference. These brass helical gears are engineered for hobbyists, robotics builders, and small-machine designers who need reliable, low-noise torque transfer without the bulk of industrial-grade components.
Each gear is machined from solid brass with a 45-degree helix angle, available in Module 1 and Module 1.5 configurations with 10, 13, or 15 teeth. Bore options range from 6 mm (0.24 in) to 15 mm (0.59 in), including keyway variants (4 mm and 5 mm keyways) for positive shaft locking. Overall gear diameter varies by module and tooth count, typically 12–27 mm (0.47–1.06 in).
Typical use cases include DC motor pinion drives in 3D printer extruder assemblies, compact gearbox stages in robotic arm joints, and speed-reduction drives in DIY CNC router Z-axis mechanisms — all applications where helical tooth engagement reduces vibration and extends component life.
Machined from brass for corrosion resistance, low friction against steel shafts, and self-lubricating properties that reduce maintenance intervals in enclosed gearboxes.
The 45-degree helix angle distributes tooth load across a longer contact line than spur gears, delivering noticeably smoother, quieter operation at equivalent speeds.
Available in Module 1 (13T, 15T) and Module 1.5 (10T, 13T, 15T) to match a wide range of gear ratio requirements in compact drive trains.
Plain bore sizes from 6 mm to 12 mm, plus keyway variants (10 mm + 4 mm key, 12 mm + 4 mm key, 14 mm + 5 mm key, 15 mm + 5 mm key) for positive, slip-free shaft engagement.
Order 1, 2, 3, or 5 pieces per pack — ideal for prototyping single units or stocking spares for production runs without over-committing budget.
Bore tolerances are machined to H7 fit standards (typically ±0.01–0.02 mm), ensuring a snug, concentric mount on standard DC motor and stepper motor output shafts.
| Material | Brass |
|---|---|
| Helix Angle | 45° |
| Module | 1 / 1.5 (see variant options) |
| Tooth Count | 10T / 13T / 15T (see variant options) |
| Bore Diameter | 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm (see variant options) |
| Keyway | 4 mm (for 10–12 mm bore) / 5 mm (for 14–15 mm bore) — keyway variants only |
| Pitch Diameter (approx.) | M1: 13–15 mm | M1.5: 15–22.5 mm |
| Overall Gear Width | See variant options |
| Bore Tolerance | H7 fit (typically ±0.01–0.02 mm) |
| Finish | Natural brass (uncoated) |
| Pack Quantity | 1 / 2 / 3 / 5 pcs (see variant options) |
| Weight (per piece) | See variant options |
Module (M) defines the tooth size and pitch diameter. Module 1.5 gears have larger, stronger teeth and a bigger pitch diameter than Module 1 for the same tooth count. Choose M1 for compact, lightweight drives (e.g., 3D printer extruders, small robots) and M1.5 when you need higher torque capacity or are mating with existing M1.5 gears in your gearbox.
No. Helical gears must mesh with other helical gears of the same module and the same (or complementary) helix angle. Mixing helical and spur gears of the same module will result in poor tooth contact, rapid wear, and noise. Always match module and helix angle when selecting mating gears.
A plain bore is sufficient for light-duty or low-torque applications where a set screw or press fit holds the gear. For higher torque, reversing loads, or applications where slippage would be dangerous, select a keyway bore variant — the key provides a positive mechanical lock between the gear and shaft, preventing rotational slip under load.
Brass gears work well against hardened steel shafts (the most common pairing), stainless steel, and aluminum shafts. Brass is softer than steel, so in a brass-on-steel mesh the brass gear acts as the sacrificial wear component — which is intentional in many designs to protect the more expensive steel shaft or mating gear. Avoid pairing brass with other brass for the mating gear, as similar-hardness pairs wear faster.
Use a digital caliper to measure the shaft outer diameter at the mounting point. Select the bore size that matches your shaft diameter exactly — for example, a 6 mm shaft requires the 6 mm bore variant. If your shaft has a flat or keyway, measure the shaft diameter across the full round section (not across the flat) and choose the corresponding keyway bore variant.
Brass has good natural corrosion resistance and performs well in moderate humidity and indoor environments. For prolonged outdoor exposure or salt-spray environments, apply a light coat of grease or corrosion-inhibiting lubricant to the gear teeth and bore. For fully outdoor or marine applications, consider stainless steel gears instead.
A light machine oil (ISO VG 32–68) or white lithium grease works well for most applications. Avoid heavy greases that can trap debris in fine-pitch teeth. For enclosed gearboxes, a splash-lubricated gear oil is ideal. Re-lubricate periodically based on operating hours and load — typically every 200–500 hours under normal conditions.
