{"product_id":"module-0-5-steel-spur-gear-20t-bore-3-4-5-6mm-rc-motor-diy","title":"Bore 3\/4\/5\/6mm Module 0.5 Steel Spur Gears 20T for RC Model Electric Motor DIY","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 0.5 Steel Spur Gear 20T — Precision Fit for RC Models \u0026amp; DIY Motor Drives\u003c\/h2\u003e\n\u003cp\u003eFinding 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.\u003c\/p\u003e\n\u003cp\u003eEach 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).\u003c\/p\u003e\n\u003cp\u003eTypical 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.\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 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.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Module 0.5 Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003ch3\u003eCarbon Steel Construction\u003c\/h3\u003e\n\u003cp\u003eMachined from carbon steel for reliable strength and wear resistance across continuous-duty RC and motor drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003ch3\u003e20-Tooth Involute Profile\u003c\/h3\u003e\n\u003cp\u003eStandard 20T involute tooth form at Module 0.5 ensures smooth, low-noise meshing with any compatible M0.5 pinion or spur gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003ch3\u003eFour Bore Options: 3 \/ 4 \/ 5 \/ 6 mm\u003c\/h3\u003e\n\u003cp\u003eSelect the bore that matches your motor shaft — covers the most common small-motor shaft diameters used in RC, robotics, and DIY builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003ch3\u003eCompact 10 mm Pitch Diameter\u003c\/h3\u003e\n\u003cp\u003eModule 0.5 × 20T yields a 10 mm pitch diameter, making this gear ideal for space-constrained gearboxes and miniature drive trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003ch3\u003eFlexible Pack Quantities\u003c\/h3\u003e\n\u003cp\u003eAvailable in 1, 2, 5, or 10-piece packs — order spares for prototyping, replace worn gears in bulk, or stock up for multi-axis builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛠️\u003c\/div\u003e\n\u003ch3\u003eDrop-In RC \u0026amp; DIY Compatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct replacement or upgrade gear for RC model drivetrains, electric motor output stages, and small-scale DIY automation projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Module 0.5 Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e20T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e10 mm (0.39 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size\u003c\/th\u003e\n\u003ctd\u003e3 mm \/ 4 mm \/ 5 mm \/ 6 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Thickness\u003c\/th\u003e\n\u003ctd\u003eTypically 5–6 mm (0.20–0.24 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute, 20° pressure angle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\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\u003e1 \/ 2 \/ 5 \/ 10 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eRC models, electric motors, DIY gearboxes, robotics\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 choose the right bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Module 0.5 pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is a carbon steel gear at this module?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a 3D printer extruder or CNC build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 piece or a multi-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor 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.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pressure angle of this gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis 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.\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 Bore Size and Amount above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"3 mm \/ 1 pcs","offer_id":52443007123730,"sku":"PENGJSCS00596x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"4 mm \/ 1 pcs","offer_id":52443007156498,"sku":"PENGJSCS00597x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"5 mm \/ 1 pcs","offer_id":52443007189266,"sku":"PENGJSCS00598x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"6 mm \/ 1 pcs","offer_id":52443007222034,"sku":"PENGJSCS00599x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"3 mm \/ 2 pcs","offer_id":52443007254802,"sku":"PENGJSCS00596x2","price":4.07,"currency_code":"USD","in_stock":true},{"title":"4 mm \/ 2 pcs","offer_id":52443007287570,"sku":"PENGJSCS00597x2","price":4.07,"currency_code":"USD","in_stock":true},{"title":"5 mm \/ 2 pcs","offer_id":52443007320338,"sku":"PENGJSCS00598x2","price":4.07,"currency_code":"USD","in_stock":true},{"title":"6 mm \/ 2 pcs","offer_id":52443007353106,"sku":"PENGJSCS00599x2","price":4.07,"currency_code":"USD","in_stock":true},{"title":"3 mm \/ 5 pcs","offer_id":52443007385874,"sku":"PENGJSCS00596x5","price":7.33,"currency_code":"USD","in_stock":true},{"title":"4 mm \/ 5 pcs","offer_id":52443007418642,"sku":"PENGJSCS00597x5","price":7.33,"currency_code":"USD","in_stock":true},{"title":"5 mm \/ 5 pcs","offer_id":52443007451410,"sku":"PENGJSCS00598x5","price":7.19,"currency_code":"USD","in_stock":true},{"title":"6 mm \/ 5 pcs","offer_id":52443007484178,"sku":"PENGJSCS00599x5","price":7.19,"currency_code":"USD","in_stock":true},{"title":"3 mm \/ 10 pcs","offer_id":52443007516946,"sku":"PENGJSCS00596x10","price":13.59,"currency_code":"USD","in_stock":true},{"title":"4 mm \/ 10 pcs","offer_id":52443007549714,"sku":"PENGJSCS00597x10","price":13.45,"currency_code":"USD","in_stock":true},{"title":"5 mm \/ 10 pcs","offer_id":52443007582482,"sku":"PENGJSCS00598x10","price":13.31,"currency_code":"USD","in_stock":true},{"title":"6 mm \/ 10 pcs","offer_id":52443007615250,"sku":"PENGJSCS00599x10","price":13.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture7of8_e5197c12-d404-4105-ab17-9321fcd56450.jpg?v=1783955529","url":"https:\/\/homediyer.com\/products\/module-0-5-steel-spur-gear-20t-bore-3-4-5-6mm-rc-motor-diy","provider":"HomeDIYer","version":"1.0","type":"link"}