{"product_id":"1012df-mod-05-plastic-spur-gear-12t-3mm-d-shaft-motor-rc-transmission","title":"1012DF Mod 0.5 Plastic Spur Gear 12T for 3mm D-Shaft Motor RC Model Transmission","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 0.5 Plastic Spur Gear 12T — Precision Fit for 3mm D-Shaft RC \u0026amp; Robotics Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen 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.\u003c\/p\u003e\n    \u003cp\u003eThis 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.\u003c\/p\u003e\n    \u003cp\u003eTypical 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e 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.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Mod 0.5 Plastic Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003ePrecise 3mm D-Shaft Bore\u003c\/strong\u003e — The D-flat bore locks directly onto standard 3mm D-shaft motor outputs, eliminating rotational slip without set screws in most low-torque applications.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n        \u003cstrong\u003eLightweight Plastic Construction\u003c\/strong\u003e — Engineering-grade plastic (typically POM or ABS) keeps rotating mass low, reducing motor load and extending battery runtime in RC and robotics builds.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\n        \u003cstrong\u003eQuiet Meshing Operation\u003c\/strong\u003e — 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.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eStandard Mod 0.5 Pitch\u003c\/strong\u003e — Fully interchangeable with any other Mod 0.5 spur, rack, or pinion gear in your drivetrain, giving you maximum design flexibility.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eMulti-Pack Options\u003c\/strong\u003e — Available in 10, 20, or 50-piece packs so you can stock spares for prototyping runs or small-batch production without overpaying for singles.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Replacement Ready\u003c\/strong\u003e — 1012DF form factor matches common RC model pinion dimensions, making it a straightforward replacement for worn or broken 12T Mod 0.5 gears.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 0.5 Plastic Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003eMod 0.5 (0.5M)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e12T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore \/ Shaft Fit\u003c\/th\u003e\n\u003ctd\u003e3mm D-flat shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eApprox. 7 mm (≈ 0.28 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eTypically 5–8 mm (≈ 0.20–0.31 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade plastic (POM or ABS)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eColor \/ Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e10 pcs \/ 20 pcs \/ 50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eRC models, robotics, DIY transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I know if this gear fits my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat other gears will mesh with this Mod 0.5 spur gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAny 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs plastic strong enough for my RC car or robot application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering-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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear corrode or degrade over time?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering-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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich pack size should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear with a metal pinion on the motor side?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need lubrication for these plastic spur gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePOM 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.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your pack quantity above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I know if this gear fits my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear is bored for a 3mm D-flat shaft. 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.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What other gears will mesh with this Mod 0.5 spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"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.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is plastic strong enough for my RC car or robot application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering-grade POM offers good stiffness and adequate strength for light-to-medium duty RC and robotics drives. For high-torque or high-impact applications, a metal Mod 0.5 gear is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode or degrade over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering-grade plastic is inherently corrosion-resistant and unaffected by moisture, light oils, and most hobby lubricants. It will not rust.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which pack size should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 10-piece pack suits single-project builds. The 20-piece pack is ideal for multiple units or spares. The 50-piece pack offers the best per-unit value for small-batch production or prototyping labs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear with a metal pinion on the motor side?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Pairing a metal motor pinion with this plastic spur gear is a common design choice — the plastic gear acts as the sacrificial wear component. Ensure both gears share the same Mod 0.5 pitch.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need lubrication for these plastic spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"POM plastic has inherent self-lubricating properties. For higher-speed use, a small amount of white lithium grease or PTFE-based lubricant applied to the gear teeth will reduce wear and noise.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"10 pcs","offer_id":52443007648018,"sku":"PENGJSCS00704x10","price":2.57,"currency_code":"USD","in_stock":true},{"title":"20 pcs","offer_id":52443007680786,"sku":"PENGJSCS00704x20","price":3.25,"currency_code":"USD","in_stock":true},{"title":"50 pcs","offer_id":52443007713554,"sku":"PENGJSCS00704x50","price":5.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of5_1_057bded5-7e3d-42c0-8460-dc92dc312ab9.jpg?v=1783955719","url":"https:\/\/homediyer.com\/products\/1012df-mod-05-plastic-spur-gear-12t-3mm-d-shaft-motor-rc-transmission","provider":"HomeDIYer","version":"1.0","type":"link"}