{"product_id":"0-5-mod-brass-pinion-spur-gear-48-teeth-bore-4-12mm","title":"0.5 Mod Brass Pinion Spur Gear 48 Teeth Bore 4\/5\/6\/8\/10\/12mm Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e0.5 Mod Brass Pinion Spur Gear 48T — Precision Transmission for Compact Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped plastic gear or an imprecise drive ratio derails your build, you need a metal replacement you can trust. The 0.5 Mod Brass Pinion Spur Gear 48 Teeth is engineered for hobbyists, robotics builders, and mechanical engineers who demand repeatable accuracy in compact power-transmission assemblies.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and low-friction meshing. The module (Mod) is 0.5, with 48 teeth and a pitch diameter of approximately 24 mm (0.94 in). Bore options span 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approx. 0.16–0.47 in) to fit a wide range of motor shafts and axles. Gear face width is typically 5–8 mm (0.20–0.31 in).\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include RC car and truck drivetrain upgrades requiring a durable 0.5 mod spur gear replacement, small robotic arm joint drives needing a brass pinion gear with precise tooth count, and DIY clock or automaton mechanisms where a 48-tooth transmission gear delivers the correct reduction ratio.\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 Meshes with any 0.5 Module (Mod 0.5) rack, pinion, or spur gear. Verify bore diameter matches your motor or shaft 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\u003eSolid Brass Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from brass for excellent corrosion resistance, smooth meshing, and longer service life compared to plastic alternatives in compact drive trains.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 0.5 — 48 Teeth\u003c\/strong\u003e\n        \u003cp\u003eStandardized 0.5 Mod tooth profile ensures accurate meshing with any compatible Mod 0.5 gear, rack, or pinion in your drivetrain assembly.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eSix Bore Sizes Available\u003c\/strong\u003e\n        \u003cp\u003eChoose from 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm bore diameters to match your motor shaft or axle without additional machining.\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\u003eAvailable in 1 PCS, 2 PCS, or 5 PCS packs — order a single replacement or stock up for prototyping and production runs at a lower per-unit cost.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eLow-Friction Transmission\u003c\/strong\u003e\n        \u003cp\u003eBrass's natural lubricity reduces friction and heat build-up during continuous operation, making these gears well-suited for motorized and servo-driven mechanisms.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e\n        \u003cp\u003eSuitable for RC vehicles, robotics joints, 3D printer extruder drives, clock mechanisms, and any compact 0.5 mod spur gear transmission requiring a reliable 48-tooth pinion.\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 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\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\u003e48T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e24 mm (0.94 in)\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 mm — See variant options\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\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\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 (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\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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 for my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or axle shaft 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 slightly undersized, a set-screw hub or shaft collar can compensate, but a precise bore match is always recommended for concentricity.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing 0.5 Mod gears and racks?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear or rack with a Module of 0.5 and a 20° pressure angle will mesh correctly with this 48-tooth spur gear. Confirm the module and pressure angle of your mating gear before ordering to ensure compatibility.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs brass strong enough for my RC car or robot drivetrain?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass offers a good balance of strength, machinability, and corrosion resistance for light-to-medium load applications such as RC cars, small robots, and servo-driven mechanisms. For very high-torque or impact-heavy applications, consider steel gears. For most hobbyist and maker builds, brass is a reliable and long-lasting choice.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes brass corrode or rust over time?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass does not rust (it contains no iron), and it has inherent corrosion resistance in most environments. In humid or outdoor conditions, brass may develop a natural patina over time, which does not affect mechanical performance. No special coating or treatment is required for typical indoor use.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the pitch diameter and how does it affect gear ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eWith Module 0.5 and 48 teeth, the pitch diameter is 24 mm (0.94 in). Gear ratio is determined by the tooth count of the mating gear divided by 48. For example, pairing this gear with a 12-tooth pinion gives a 4:1 reduction ratio. Use this to calculate the output speed and torque for your specific application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I lubricate these gears during use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLight lubrication with a gear grease or white lithium grease is recommended for continuous-duty or high-speed applications to reduce wear and noise. For intermittent or low-speed use, brass's natural lubricity is often sufficient without additional lubricant. Avoid petroleum-based oils that may attract dust and debris.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I buy just one gear, or do I need to buy a set?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYou can purchase as few as 1 PCS. Pack options of 2 PCS and 5 PCS are also available at a lower per-unit cost, which is useful for prototyping, spares inventory, or multi-axis builds requiring identical gears.\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 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 choose the right bore size for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or axle shaft 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 slightly undersized, a set-screw hub or shaft collar can compensate, but a precise bore match is always recommended for concentricity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 0.5 Mod gears and racks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any gear or rack with a Module of 0.5 and a 20° pressure angle will mesh correctly with this 48-tooth spur gear. Confirm the module and pressure angle of your mating gear before ordering to ensure compatibility.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my RC car or robot drivetrain?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass offers a good balance of strength, machinability, and corrosion resistance for light-to-medium load applications such as RC cars, small robots, and servo-driven mechanisms. For very high-torque or impact-heavy applications, consider steel gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does brass corrode or rust over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass does not rust and has inherent corrosion resistance in most environments. In humid or outdoor conditions, brass may develop a natural patina over time, which does not affect mechanical performance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pitch diameter and how does it affect gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"With Module 0.5 and 48 teeth, the pitch diameter is 24 mm (0.94 in). Gear ratio is determined by the tooth count of the mating gear divided by 48. For example, pairing this gear with a 12-tooth pinion gives a 4:1 reduction ratio.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I lubricate these gears during use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Light lubrication with a gear grease or white lithium grease is recommended for continuous-duty or high-speed applications. For intermittent or low-speed use, brass's natural lubricity is often sufficient without additional lubricant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I buy just one gear, or do I need to buy a set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"You can purchase as few as 1 PCS. Pack options of 2 PCS and 5 PCS are also available at a lower per-unit cost, useful for prototyping, spares inventory, or multi-axis builds.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 48T 【Bore 4mm】 \/ 1 PCS","offer_id":52442815463698,"sku":"AdaahGFCD04469x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 5mm】 \/ 1 PCS","offer_id":52442815496466,"sku":"AdaahGFCD04470x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 6mm】 \/ 1 PCS","offer_id":52442815529234,"sku":"AdaahGFCD04471x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 8mm】 \/ 1 PCS","offer_id":52442815562002,"sku":"AdaahGFCD04472x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 10mm】 \/ 1 PCS","offer_id":52442815594770,"sku":"AdaahGFCD04473x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 12mm】 \/ 1 PCS","offer_id":52442815627538,"sku":"AdaahGFCD04474x1","price":6.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 4mm】 \/ 2 PCS","offer_id":52442815660306,"sku":"AdaahGFCD04469x2","price":11.02,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 5mm】 \/ 2 PCS","offer_id":52442815693074,"sku":"AdaahGFCD04470x2","price":11.02,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 6mm】 \/ 2 PCS","offer_id":52442815725842,"sku":"AdaahGFCD04471x2","price":10.96,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 8mm】 \/ 2 PCS","offer_id":52442815758610,"sku":"AdaahGFCD04472x2","price":10.88,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 10mm】 \/ 2 PCS","offer_id":52442815791378,"sku":"AdaahGFCD04473x2","price":10.83,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 12mm】 \/ 2 PCS","offer_id":52442815824146,"sku":"AdaahGFCD04474x2","price":10.68,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 4mm】 \/ 5 PCS","offer_id":52442815856914,"sku":"AdaahGFCD04469x5","price":24.36,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 5mm】 \/ 5 PCS","offer_id":52442815889682,"sku":"AdaahGFCD04470x5","price":24.3,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 6mm】 \/ 5 PCS","offer_id":52442815922450,"sku":"AdaahGFCD04471x5","price":24.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 8mm】 \/ 5 PCS","offer_id":52442815955218,"sku":"AdaahGFCD04472x5","price":24.02,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 10mm】 \/ 5 PCS","offer_id":52442815987986,"sku":"AdaahGFCD04473x5","price":23.8,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 48T 【Bore 12mm】 \/ 5 PCS","offer_id":52442816020754,"sku":"AdaahGFCD04474x5","price":23.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture7of13_895d548d-37fb-4adf-af9b-925cff42b517.jpg?v=1783607178","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-pinion-spur-gear-48-teeth-bore-4-12mm","provider":"HomeDIYer","version":"1.0","type":"link"}