Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY
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Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIYBore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY

Bore 3/4/5/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY

HomeDIYer
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By HomeDIYer®

Price:
$2.98 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Module 0.5 Steel Spur Gear 20T — Precision Fit for RC Models & DIY Motor Drives

Finding a small-module spur gear that fits your RC car, drone motor shaft, or DIY gearbox without slop or wobble is a constant challenge for hobbyists and makers. This Module 0.5 Steel Spur Gear 20T is engineered for exactly those tight-tolerance applications where bore accuracy and tooth profile consistency are non-negotiable.

Each gear is machined from carbon steel, featuring a 20-tooth involute profile at Module 0.5 (pitch diameter 10 mm / 0.39 in). Available bore sizes span 3 mm, 4 mm, 5 mm, and 6 mm (approximately 0.12–0.24 in), covering the most common motor shaft diameters used in small-scale drive systems. Overall gear thickness is typically 5–6 mm (≈0.20–0.24 in).

Typical use cases include RC model drivetrain reduction stages, small electric motor output shafts in robotics and automation rigs, and DIY CNC or 3D-printer extruder gear trains where a compact, low-backlash mesh is required.

⚙️ Compatibility: Designed for Module 0.5 gear systems. Meshes with any M0.5 spur or pinion gear. Bore sizes 3 / 4 / 5 / 6 mm suit standard RC motor shafts and small stepper/DC motor outputs.

✅ Key Features of These Module 0.5 Steel Spur Gears

🔩

Carbon Steel Construction

Machined from carbon steel for reliable strength and wear resistance across continuous-duty RC and motor drive applications.

🎯

20-Tooth Involute Profile

Standard 20T involute tooth form at Module 0.5 ensures smooth, low-noise meshing with any compatible M0.5 pinion or spur gear.

📐

Four Bore Options: 3 / 4 / 5 / 6 mm

Select the bore that matches your motor shaft — covers the most common small-motor shaft diameters used in RC, robotics, and DIY builds.

🔄

Compact 10 mm Pitch Diameter

Module 0.5 × 20T yields a 10 mm pitch diameter, making this gear ideal for space-constrained gearboxes and miniature drive trains.

📦

Flexible Pack Quantities

Available in 1, 2, 5, or 10-piece packs — order spares for prototyping, replace worn gears in bulk, or stock up for multi-axis builds.

🛠️

Drop-In RC & DIY Compatibility

Designed as a direct replacement or upgrade gear for RC model drivetrains, electric motor output stages, and small-scale DIY automation projects.

📐 Technical Specifications — Module 0.5 Spur Gear

Module 0.5
Number of Teeth 20T
Pitch Diameter 10 mm (0.39 in)
Bore Size 3 mm / 4 mm / 5 mm / 6 mm (see variant options)
Gear Thickness Typically 5–6 mm (0.20–0.24 in)
Material Carbon Steel
Tooth Profile Involute, 20° pressure angle
Finish See variant options
Pack Quantity 1 / 2 / 5 / 10 pcs (see variant options)
Application RC models, electric motors, DIY gearboxes, robotics

❓ Frequently Asked Questions

How do I choose the right bore size?

Measure your motor or shaft output diameter with a caliper. Select the bore that matches: 3 mm for micro motors, 4–5 mm for standard small DC/stepper motors, and 6 mm for larger RC or servo motor shafts. A bore that matches the shaft exactly (with a set-screw or press fit) will give the tightest, most reliable connection.

Will this gear mesh with my existing Module 0.5 pinion?

Yes. Any Module 0.5 involute spur or pinion gear with a standard 20° pressure angle will mesh correctly with this 20T gear. Confirm your existing gear is marked M0.5 or 0.5 mod before ordering.

How strong is a carbon steel gear at this module?

Carbon steel provides significantly higher tensile and shear strength than brass or plastic alternatives at the same module. For RC model and light-duty motor drive loads (typically under 5 Nm at this scale), carbon steel is more than adequate and resists tooth deformation under repeated impact loads.

Is this gear corrosion-resistant?

Carbon steel has moderate corrosion resistance. For indoor robotics, RC, and dry-environment DIY use, no additional treatment is typically needed. If used in humid or outdoor environments, a light coat of machine oil or grease on the tooth faces will protect against surface oxidation and also serve as lubrication.

Can I use this gear in a 3D printer extruder or CNC build?

Yes. Module 0.5 gears are commonly used in compact extruder gear trains and small CNC axis drives. The 20T count and available bore sizes are compatible with many NEMA 14/17 motor shaft diameters (typically 5 mm). Verify your existing gear module before installing.

Should I order 1 piece or a multi-pack?

For a single replacement or prototype build, the 1-piece option is sufficient. For multi-axis robots, RC fleet maintenance, or production runs, the 5- or 10-piece packs offer a lower per-unit cost and ensure you have spares on hand. Gears at this module are wear items in high-cycle applications, so stocking extras is recommended.

What is the pressure angle of this gear?

This gear uses the standard 20° pressure angle, which is the most widely adopted involute gear standard globally. It ensures compatibility with the vast majority of Module 0.5 mating gears available from other suppliers and in off-the-shelf gearboxes.

🛒 Select your Bore Size and Amount above, then add to cart.

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