Mod 0.5 120T Plastic Spur Gear for 2mm Motor Shaft RC Model Toy Transmission DIY

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Mod 0.5 120T Plastic Spur Gear for 2mm Motor Shaft RC Model Toy Transmission DIY

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Amount: 1 pcs

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$3.74 USD

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In stock (500 units), ready to be shipped

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Mod 0.5 120T Plastic Spur Gear — Reliable Drive for RC Models & DIY Transmissions

When a stripped or undersized gear stalls your RC car, robot arm, or small-batch automation project, every minute of downtime costs you. Makers, hobbyists, and small-scale engineers who need a dependable, drop-in spur gear for 2 mm motor shafts will find this Mod 0.5 120-tooth gear a precise, ready-to-run solution.

This spur gear is machined to Module 0.5 (Mod 0.5) with 120 teeth and a 2 mm bore, sized to fit standard micro-motor shafts directly. The gear body is molded from engineering-grade plastic — typically nylon or POM — offering a balance of low weight, reduced operating noise, and adequate load capacity for light-to-medium duty cycles. Outer diameter is approximately 61 mm (≈ 2.40 in), with a face width typically in the 5–8 mm (0.20–0.31 in) range depending on the variant.

Typical use cases include RC model car and truck final-drive stages, small robotic joint reduction gearing for 2 mm shaft servo motors, and DIY transmission prototypes where a lightweight plastic spur gear for 2mm shaft keeps inertia low and noise minimal.

⚙️ Compatibility: Designed for 2 mm diameter motor shafts. Module 0.5 tooth profile — pairs with any Mod 0.5 mating gear or pinion.

✅ Key Features of These Mod 0.5 120T Plastic Spur Gears

🎯 Precision Mod 0.5 Tooth Profile — 120 teeth cut to Module 0.5 standard for smooth, low-backlash meshing with any compatible Mod 0.5 pinion or gear in your drivetrain.
🔩 2 mm Bore — Direct Shaft Fit — Bored to exactly 2 mm to slide onto standard micro-motor and servo shafts without adapters or machining, saving setup time.
🪶 Lightweight Engineering Plastic — Molded from nylon or POM-type resin, this gear reduces rotating mass and dampens gear noise compared to metal alternatives — ideal for battery-powered RC and robotics applications.
📐 ~61 mm Outer Diameter — The 120-tooth Mod 0.5 geometry yields an outer diameter of approximately 61 mm (≈ 2.40 in), giving a useful gear ratio range when paired with small pinions.
🔄 Multi-Pack Options — Available in 1, 2, 5, or 10-piece quantities so you can stock spares for ongoing projects or small-batch builds without over-ordering.
🛠️ DIY & Maker Friendly — No special tooling required. Fits standard 2 mm shafts and integrates into RC model transmissions, robotic reduction stages, and educational mechanism kits straight out of the pack.

📐 Technical Specifications — Mod 0.5 Plastic Spur Gear

Module	0.5
Number of Teeth	120T
Bore Diameter	2 mm
Outer Diameter (OD)	~61 mm (~2.40 in)
Pitch Diameter	60 mm (2.36 in)
Face Width	Typically 5–8 mm (0.20–0.31 in)
Material	Engineering plastic (nylon / POM type)
Tooth Profile	Standard involute, Mod 0.5
Shaft Compatibility	2 mm diameter motor shaft
Color / Finish	See variant options
Weight (per piece)	See variant options
Quantity Options	1 pcs / 2 pcs / 5 pcs / 10 pcs

❓ Frequently Asked Questions

What does "Mod 0.5" mean and why does it matter?

Module (Mod) is the standardized unit that defines gear tooth size. Mod 0.5 means each tooth has a pitch of 0.5 mm per tooth. For two gears to mesh correctly, both must share the same module. This gear is Mod 0.5, so it will only mesh properly with other Mod 0.5 gears or pinions — confirm your mating gear's module before ordering.

Will this gear fit my motor shaft?

This gear is bored to exactly 2 mm. It is designed for motors and servos with a 2 mm diameter output shaft — common in micro RC cars, small robotics servos, and hobby gear motors. If your shaft is a different diameter (e.g., 1.5 mm, 2.3 mm, or 3 mm), this gear will not fit without modification.

How strong is a plastic spur gear compared to a metal one?

Engineering plastics like nylon and POM offer good strength for light-to-medium duty applications such as RC models and small robots. They are quieter, lighter, and self-lubricating compared to metal gears. However, for high-torque or continuous industrial loads, a metal gear would be more appropriate. For typical RC and DIY hobby use, plastic Mod 0.5 gears perform reliably.

Is this gear corrosion-resistant?

Yes. Engineering plastic (nylon/POM) does not rust or corrode, making it suitable for light outdoor RC use and humid workshop environments. It is not rated for submersion or harsh chemical exposure, but for standard hobby and maker applications it holds up well over time.

What gear ratio can I achieve with this 120T gear?

Gear ratio depends on the number of teeth on the mating pinion. For example, pairing this 120T gear with a 12T pinion gives a 10:1 reduction ratio. With a 15T pinion you get 8:1, and with a 20T pinion you get 6:1. The large tooth count makes this gear well-suited for high-reduction, low-speed output stages in RC drivetrains and robotic joints.

How do I choose between 1, 2, 5, or 10 pcs?

If you are building or repairing a single model, 1 or 2 pcs is usually sufficient. For ongoing projects, prototyping, or small-batch builds where you want spares on hand, the 5 or 10-piece packs offer better per-unit value. Select the quantity that matches your project scale above.

Does this gear require lubrication?

POM and nylon plastics are inherently low-friction and can run dry in most hobby applications. For extended run times or higher-load conditions, a light plastic-safe grease (such as white lithium grease) applied to the tooth faces can extend service life and further reduce noise.

🛒 Select your quantity above, then add to cart.