{"product_id":"0-5-mod-brass-spur-gear-55-teeth-bore-4-15mm-motor-gear-transmission-pinion-gear","title":"0.5 Mod Brass Spur Gear 55 Teeth Bore 4~15mm Motor Gear Transmission Pinion Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod Brass Spur Gear 55T — Reliable Pinion Gear for Compact Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your RC car, robotic arm, or small-scale transmission demands a gear that holds tight tolerances without stripping under load, a poorly matched pinion gear becomes the weakest link in the entire drivetrain. Hobbyists, makers, and mechanical engineers who work with compact motor assemblies need a 0.5 module spur gear that fits precisely, meshes cleanly, and resists wear over thousands of cycles.\u003c\/p\u003e\n\u003cp\u003eThis 0.5 Mod Brass Spur Gear features 55 teeth machined from solid brass stock, offering a balance of machinability and corrosion resistance. The bore diameter ranges from 4 mm (0.157 in) to 15 mm (0.591 in) across eight size options, with an outer diameter of approximately 28 mm (1.10 in) based on the 0.5 module and 55-tooth geometry. Face width is typically 5–8 mm (0.20–0.31 in); confirm exact dimensions against your variant selection.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include motor-to-shaft coupling in 1:10 and 1:12 scale RC drivetrains, torque transmission in desktop CNC pen plotters, and stage-reduction gearing in small servo-driven robotic joints — all scenarios where a compact 0.5 mod 55-tooth pinion gear must mesh with a matching rack or spur without backlash creep.\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 0.5 module gear systems. Meshes with any 0.5 Mod spur gear, rack, or pinion of matching module. Verify bore diameter matches your motor shaft or axle before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 0.5 Mod Brass 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\u003e55-Tooth Precision Profile\u003c\/strong\u003e\n\u003cp\u003eInvolute tooth geometry machined to 0.5 module standard ensures smooth, low-noise meshing with any compatible 0.5 Mod counterpart gear or rack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\n\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e\n\u003cp\u003eBrass offers natural corrosion resistance, self-lubricating properties under light loads, and easy re-machining if custom bore sizing is needed in your workshop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003e8 Bore Sizes: 4 mm to 15 mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in bore diameters of 4, 5, 6, 8, 10, 12, 14, and 15 mm to fit a wide range of motor shafts, axles, and drive pins without adapter sleeves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder as 1 PCS for prototyping, 2 PCS for paired-stage builds, or 5 PCS for batch production runs and spare-part inventory management.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eCompact Outer Diameter ~28 mm\u003c\/strong\u003e\n\u003cp\u003eThe 0.5 Mod 55T geometry yields an outer diameter of approximately 28 mm (1.10 in), fitting inside tight motor bays and compact gearbox housings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e\n\u003cp\u003eStandardized module sizing means this gear can directly replace worn 0.5 Mod 55T gears in existing assemblies without redesigning the gear train.\u003c\/p\u003e\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 — 0.5 Mod Brass 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\u003e55T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e~28 mm (1.10 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e~27.5 mm (1.08 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard involute)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS — See variant options\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct bore diameter for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft or axle diameter with a caliper. Select the bore size that matches exactly — for example, a 5 mm motor shaft requires the Bore 5 mm variant. If your shaft is between listed sizes, choose the next size up and use a set screw or keyway adapter to secure the gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat module must the mating gear be to mesh with this gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear is 0.5 module. Any mating spur gear, rack, or pinion must also be 0.5 module. Mixing modules (e.g., pairing a 0.5 Mod gear with a 0.8 Mod gear) will result in incorrect meshing, excessive noise, and rapid tooth wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs brass strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is well-suited for light-to-medium load applications such as RC drivetrains, robotics, instrumentation, and hobby CNC machines. It offers good wear resistance and natural lubricity. For heavy-load or high-RPM industrial applications, consider steel gears instead. If in doubt, contact us with your torque and speed requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear corrode if used in a humid or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has inherent corrosion resistance and will not rust like steel. In humid or mildly wet environments it performs reliably. For prolonged outdoor or marine exposure, applying a light coat of grease or gear oil will extend service life significantly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear as a direct replacement for a worn 0.5 Mod 55T gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Because module and tooth count are standardized, this gear is a drop-in replacement for any 0.5 Mod 55T spur gear of the same bore diameter. Verify the face width and hub length of your original gear against the product dimensions to confirm full compatibility before installation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a two-stage gear reduction?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA two-stage reduction typically requires one gear per stage, so the 2 PCS pack is a convenient starting point. If you are building multiple units or want spares on hand, the 5 PCS pack offers a lower per-unit cost and ensures you have replacements ready without reordering delays.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the approximate gear ratio when this 55T gear meshes with a smaller pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio equals the number of teeth on the driven gear divided by the number of teeth on the driving pinion. For example, pairing this 55T gear with an 11T pinion gives a 5:1 reduction ratio. Adjust your driving pinion tooth count to achieve your target speed and torque output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your bore size and packing 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 choose the correct bore diameter for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft or axle diameter with a caliper. Select the bore size that matches exactly. If your shaft is between listed sizes, choose the next size up and use a set screw or keyway adapter to secure the gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What module must the mating gear be to mesh with this gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear is 0.5 module. Any mating spur gear, rack, or pinion must also be 0.5 module. Mixing modules will result in incorrect meshing, excessive noise, and rapid tooth wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is well-suited for light-to-medium load applications such as RC drivetrains, robotics, instrumentation, and hobby CNC machines. For heavy-load or high-RPM industrial applications, consider steel gears instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode if used in a humid or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has inherent corrosion resistance and will not rust like steel. For prolonged outdoor or marine exposure, applying a light coat of grease or gear oil will extend service life significantly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear as a direct replacement for a worn 0.5 Mod 55T gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This gear is a drop-in replacement for any 0.5 Mod 55T spur gear of the same bore diameter. Verify the face width and hub length of your original gear before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a two-stage gear reduction?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A two-stage reduction typically requires one gear per stage, so the 2 PCS pack is a convenient starting point. The 5 PCS pack offers a lower per-unit cost for batch builds.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the approximate gear ratio when this 55T gear meshes with a smaller pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gear ratio equals the number of teeth on the driven gear divided by the number of teeth on the driving pinion. For example, pairing this 55T gear with an 11T pinion gives a 5:1 reduction ratio.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 55T 【Bore 4mm】 \/ 1 PCS","offer_id":52442813038866,"sku":"AdaahGFCD04493x1","price":14.67,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 5mm】 \/ 1 PCS","offer_id":52442813071634,"sku":"AdaahGFCD04494x1","price":14.57,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 6mm】 \/ 1 PCS","offer_id":52442813104402,"sku":"AdaahGFCD04495x1","price":14.57,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 8mm】 \/ 1 PCS","offer_id":52442813137170,"sku":"AdaahGFCD04496x1","price":14.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 10mm】 \/ 1 PCS","offer_id":52442813169938,"sku":"AdaahGFCD04497x1","price":14.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 12mm】 \/ 1 PCS","offer_id":52442813202706,"sku":"AdaahGFCD04498x1","price":14.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 14mm】 \/ 1 PCS","offer_id":52442813235474,"sku":"AdaahGFCD04499x1","price":14.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 15mm】 \/ 1 PCS","offer_id":52442813268242,"sku":"AdaahGFCD04500x1","price":14.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 4mm】 \/ 2 PCS","offer_id":52442813301010,"sku":"AdaahGFCD04493x2","price":24.1,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 5mm】 \/ 2 PCS","offer_id":52442813333778,"sku":"AdaahGFCD04494x2","price":24.1,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 6mm】 \/ 2 PCS","offer_id":52442813366546,"sku":"AdaahGFCD04495x2","price":24.04,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 8mm】 \/ 2 PCS","offer_id":52442813399314,"sku":"AdaahGFCD04496x2","price":23.91,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 10mm】 \/ 2 PCS","offer_id":52442813432082,"sku":"AdaahGFCD04497x2","price":23.75,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 12mm】 \/ 2 PCS","offer_id":52442813464850,"sku":"AdaahGFCD04498x2","price":23.51,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 14mm】 \/ 2 PCS","offer_id":52442813497618,"sku":"AdaahGFCD04499x2","price":23.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 15mm】 \/ 2 PCS","offer_id":52442813530386,"sku":"AdaahGFCD04500x2","price":23.08,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 4mm】 \/ 5 PCS","offer_id":52442813563154,"sku":"AdaahGFCD04493x5","price":54.11,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 5mm】 \/ 5 PCS","offer_id":52442813595922,"sku":"AdaahGFCD04494x5","price":54.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 6mm】 \/ 5 PCS","offer_id":52442813628690,"sku":"AdaahGFCD04495x5","price":53.92,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 8mm】 \/ 5 PCS","offer_id":52442813661458,"sku":"AdaahGFCD04496x5","price":53.57,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 10mm】 \/ 5 PCS","offer_id":52442813694226,"sku":"AdaahGFCD04497x5","price":53.16,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 12mm】 \/ 5 PCS","offer_id":52442813726994,"sku":"AdaahGFCD04498x5","price":52.62,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 14mm】 \/ 5 PCS","offer_id":52442813759762,"sku":"AdaahGFCD04499x5","price":52.07,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 55T 【Bore 15mm】 \/ 5 PCS","offer_id":52442813792530,"sku":"AdaahGFCD04500x5","price":51.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of15_c73301d2-8d75-4b69-9c90-4d7492b51b6d.jpg?v=1783607112","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-spur-gear-55-teeth-bore-4-15mm-motor-gear-transmission-pinion-gear","provider":"HomeDIYer","version":"1.0","type":"link"}