1012DF Mod 0.5 Plastic Spur Gear 12T for 3mm D-Shaft Motor RC Model Transmission

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1012DF Mod 0.5 Plastic Spur Gear 12T for 3mm D-Shaft Motor RC Model Transmission

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By HomeDIYer®

Amount: 10 pcs

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$2.57 USD

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In stock (500 units), ready to be shipped

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Mod 0.5 Plastic Spur Gear 12T — Precision Fit for 3mm D-Shaft RC & Robotics Drives

When a stripped or undersized gear stalls your RC model or robotics project mid-build, every millimeter of shaft fit matters. The 1012DF Mod 0.5 Plastic Spur Gear is engineered for makers, hobbyists, and small-batch builders who need a reliable, lightweight transmission component that drops straight onto a 3mm D-shaft motor without shimming or modification.

This spur gear features a 12-tooth (12T) profile with a Module 0.5 (Mod 0.5) pitch, manufactured from engineering-grade plastic (typically POM or ABS). The outer diameter is approximately 7 mm (≈ 0.28 in), with a bore sized precisely for a 3mm D-flat shaft. Face width is typically 5–8 mm (≈ 0.20–0.31 in) depending on the variant.

Typical applications include RC car and truck gearboxes requiring a compact 12T pinion, small robotic arm joint drives where low backlash and quiet operation are priorities, and DIY motorized mechanisms such as conveyor prototypes, camera sliders, and automated dispensers that benefit from a lightweight plastic spur gear in a Mod 0.5 transmission.

⚙️ Compatibility: Fits 3mm D-flat shaft motors. Meshes with any Mod 0.5 (0.5M) spur or pinion gear. Verify tooth count and shaft bore before ordering.

✅ Key Features of These Mod 0.5 Plastic Spur Gears

🎯 Precise 3mm D-Shaft Bore — The D-flat bore locks directly onto standard 3mm D-shaft motor outputs, eliminating rotational slip without set screws in most low-torque applications.

⚖️ Lightweight Plastic Construction — Engineering-grade plastic (typically POM or ABS) keeps rotating mass low, reducing motor load and extending battery runtime in RC and robotics builds.

🔇 Quiet Meshing Operation — Plastic-on-plastic or plastic-on-metal Mod 0.5 gear pairs run noticeably quieter than all-metal equivalents, ideal for indoor robots and camera rigs.

📐 Standard Mod 0.5 Pitch — Fully interchangeable with any other Mod 0.5 spur, rack, or pinion gear in your drivetrain, giving you maximum design flexibility.

📦 Multi-Pack Options — Available in 10, 20, or 50-piece packs so you can stock spares for prototyping runs or small-batch production without overpaying for singles.

🔄 Drop-In Replacement Ready — 1012DF form factor matches common RC model pinion dimensions, making it a straightforward replacement for worn or broken 12T Mod 0.5 gears.

📐 Technical Specifications — Mod 0.5 Plastic Spur Gear

Module (Pitch)	Mod 0.5 (0.5M)
Number of Teeth	12T
Bore / Shaft Fit	3mm D-flat shaft
Outer Diameter	Approx. 7 mm (≈ 0.28 in)
Face Width	Typically 5–8 mm (≈ 0.20–0.31 in)
Material	Engineering-grade plastic (POM or ABS)
Pressure Angle	20°
Gear Type	Spur gear
Color / Finish	See variant options
Weight (per piece)	See variant options
Pack Quantity	10 pcs / 20 pcs / 50 pcs
Application	RC models, robotics, DIY transmission

❓ Frequently Asked Questions

How do I know if this gear fits my motor shaft?

This gear is bored for a 3mm D-flat shaft — a shaft with one flat side milled along its length. Measure your motor output shaft diameter with calipers. If it reads 3.00 mm and has a D-flat profile, this gear will fit. Round 3mm shafts require a set-screw hub adapter and are not a direct fit.

What other gears will mesh with this Mod 0.5 spur gear?

Any gear with a Module 0.5 (0.5M) pitch will mesh correctly — spur gears, pinion gears, or racks labeled Mod 0.5. Do not mix with Mod 0.3, Mod 0.8, or imperial DP gears, as the tooth profiles are incompatible and will cause rapid wear or binding.

Is plastic strong enough for my RC car or robot application?

Engineering-grade POM (polyoxymethylene) offers good stiffness, low friction, and adequate strength for light-to-medium duty RC and robotics drives. For high-torque or high-impact applications (e.g., off-road RC bashing), a metal Mod 0.5 gear is recommended. These plastic gears are well-suited for indoor robots, camera sliders, and light RC models.

Will this gear corrode or degrade over time?

Engineering-grade plastic is inherently corrosion-resistant and unaffected by moisture, light oils, and most hobby lubricants. It will not rust. UV exposure over extended periods may cause minor surface degradation, so indoor or enclosed-drivetrain use is ideal for long service life.

Which pack size should I order?

The 10-piece pack suits single-project builds or initial testing. The 20-piece pack is ideal if you are building multiple units or want spares on hand. The 50-piece pack offers the best per-unit value for small-batch production runs, classroom kits, or prototyping labs where gear replacements are frequent.

Can I use this gear with a metal pinion on the motor side?

Yes. Pairing a metal motor pinion with this plastic spur gear is a common and intentional design choice — the plastic gear acts as the sacrificial wear component, protecting the motor pinion and making replacements inexpensive. Ensure both gears share the same Mod 0.5 pitch for correct meshing.

Do I need lubrication for these plastic spur gears?

POM plastic has inherent self-lubricating properties, so light-duty applications often run dry. For higher-speed or continuous-duty use, a small amount of white lithium grease or PTFE-based lubricant applied to the gear teeth will reduce wear and noise. Avoid petroleum-based oils that may swell or degrade certain plastics.

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