{"product_id":"0-5-mod-brass-pinion-spur-gear-52-teeth-bore-4-12mm","title":"0.5 Mod Brass Pinion Spur Gear 52 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 Spur Gear 52T — Precision Transmission for Compact Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped plastic gear or an imprecise mesh throws off your entire build, the frustration is real — especially for RC hobbyists, robotics engineers, and precision instrument makers who depend on tight tolerances. This 0.5 module brass pinion spur gear with 52 teeth is engineered for makers and professionals who need reliable, repeatable power transmission in compact mechanisms.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. The module (Mod) is 0.5, with 52 teeth and a pitch diameter of approximately 26 mm (1.02 in). Bore options range from 4 mm to 12 mm (0.16 in – 0.47 in), covering the most common shaft diameters used in small-scale drive systems. Face width is typically 5–8 mm (0.20–0.31 in).\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include RC car differential and drive train assemblies requiring a 0.5 mod spur gear replacement, compact robotic joint actuators where a brass 52-tooth transmission gear reduces backlash, and precision clock or instrument mechanisms that demand a low-noise metal spur gear with consistent tooth profile.\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 gear (pinion or spur). Verify bore diameter matches your shaft before ordering. Suitable for shafts from 4 mm to 12 mm.\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    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e — Machines cleanly, resists corrosion in humid or lightly oiled environments, and runs quieter than steel alternatives in low-load applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e52-Tooth \/ 0.5 Module Profile\u003c\/strong\u003e — Standard metric tooth form ensures accurate meshing with any 0.5 mod counterpart gear, minimizing backlash and transmission error.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e6 Bore Sizes Available\u003c\/strong\u003e — Choose from 4, 5, 6, 8, 10, or 12 mm bore to match your shaft directly — no reaming or adapters required for standard shaft diameters.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, or 5-piece packs, so you can stock spares or outfit an entire assembly run without overpaying for singles.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eLow-Noise Operation\u003c\/strong\u003e — Brass-on-brass or brass-on-steel meshing produces less audible noise than cast iron or hardened steel gears, ideal for indoor robotics and instrument builds.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e — Standard 0.5 mod tooth profile and common bore sizes make these a direct replacement for OEM plastic or metal spur gears in RC and hobby drive trains.\u003c\/li\u003e\n    \u003c\/ul\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 (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\u003e52T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e26 mm (1.02 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003eApprox. 27 mm (1.06 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\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\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard metric involute, 20° pressure angle\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        \u003ctr\u003e\n\u003cth\u003eCompatible Module\u003c\/th\u003e\n\u003ctd\u003e0.5 Mod gears only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway \/ Set Screw\u003c\/th\u003e\n\u003ctd\u003eSee 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\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bore size for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper. Select the bore that matches exactly — for example, a 6 mm shaft requires the Bore 6mm variant. A bore that is too large will cause shaft slippage; too small will not fit without machining. If your shaft is between listed sizes, choose the next smaller bore and ream to fit.\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 plastic pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All 0.5 module gears — regardless of material — share the same tooth profile and pitch, so this brass spur gear will mesh correctly with any 0.5 mod plastic, aluminum, or steel pinion. Confirm the mating gear is also 0.5 mod before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is brass compared to steel for gear applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has lower tensile strength than steel (typically 300–500 MPa vs. 500–900 MPa for mild steel), making it suitable for light-to-moderate load applications such as RC cars, small robots, and instruments. For high-torque or high-speed industrial drives, a steel gear would be more appropriate. Brass excels where low noise, corrosion resistance, and ease of machining are priorities.\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\u003eBrass offers good resistance to atmospheric corrosion and mild moisture. It is not recommended for prolonged immersion in water or exposure to strong acids. For outdoor or wet environments, consider applying a light machine oil to the tooth surfaces to extend service life.\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 common metric involute tooth form. It is compatible with other standard 0.5 mod gears that also use a 20° pressure angle. Mixing gears with different pressure angles (e.g., 14.5°) will result in poor mesh and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I buy 1 PCS, 2 PCS, or 5 PCS?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eIf you are replacing a single worn gear, the 1 PCS option is sufficient. For builds with multiple identical gear stages, or if you want a spare on hand, the 2 PCS pack offers better value. The 5 PCS pack is ideal for batch production, classroom projects, or stocking a workshop — the per-unit cost decreases with larger quantities.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear in a high-speed RC car drivetrain?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, for 1\/24 to 1\/18 scale RC cars that use 0.5 mod gearing, this brass spur gear is a common upgrade from stock plastic gears. Brass provides better durability under repeated load cycles. Ensure your motor pinion is also 0.5 mod and that the center distance between shafts is set correctly for proper mesh depth.\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 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 right bore size for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper. Select the bore that matches exactly — for example, a 6 mm shaft requires the Bore 6mm variant. A bore that is too large will cause shaft slippage; too small will not fit without machining. If your shaft is between listed sizes, choose the next smaller bore and ream to fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 0.5 mod plastic pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All 0.5 module gears share the same tooth profile and pitch, so this brass spur gear will mesh correctly with any 0.5 mod plastic, aluminum, or steel pinion. Confirm the mating gear is also 0.5 mod before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is brass compared to steel for gear applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has lower tensile strength than steel (typically 300–500 MPa vs. 500–900 MPa for mild steel), making it suitable for light-to-moderate load applications such as RC cars, small robots, and instruments. For high-torque or high-speed industrial drives, a steel gear would be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass offers good resistance to atmospheric corrosion and mild moisture. It is not recommended for prolonged immersion in water or exposure to strong acids. Apply a light machine oil to the tooth surfaces for outdoor or wet environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pressure angle of this gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear uses the standard 20° pressure angle, the most common metric involute tooth form. It is compatible with other standard 0.5 mod gears that also use a 20° pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I buy 1 PCS, 2 PCS, or 5 PCS?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If replacing a single worn gear, 1 PCS is sufficient. For builds with multiple identical gear stages or a spare, 2 PCS offers better value. The 5 PCS pack is ideal for batch production, classroom projects, or workshop stocking.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a high-speed RC car drivetrain?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, for 1\/24 to 1\/18 scale RC cars using 0.5 mod gearing, this brass spur gear is a common upgrade from stock plastic gears. Ensure your motor pinion is also 0.5 mod and that center distance is set correctly for proper mesh depth.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 52T 【Bore 4mm】 \/ 1 PCS","offer_id":52442799145234,"sku":"AdaahGFCD04481x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 5mm】 \/ 1 PCS","offer_id":52442799178002,"sku":"AdaahGFCD04482x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 6mm】 \/ 1 PCS","offer_id":52442799210770,"sku":"AdaahGFCD04483x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 8mm】 \/ 1 PCS","offer_id":52442799243538,"sku":"AdaahGFCD04484x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 10mm】 \/ 1 PCS","offer_id":52442799276306,"sku":"AdaahGFCD04485x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 12mm】 \/ 1 PCS","offer_id":52442799309074,"sku":"AdaahGFCD04486x1","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 4mm】 \/ 2 PCS","offer_id":52442799341842,"sku":"AdaahGFCD04481x2","price":21.11,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 5mm】 \/ 2 PCS","offer_id":52442799374610,"sku":"AdaahGFCD04482x2","price":21.11,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 6mm】 \/ 2 PCS","offer_id":52442799407378,"sku":"AdaahGFCD04483x2","price":21.03,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 8mm】 \/ 2 PCS","offer_id":52442799440146,"sku":"AdaahGFCD04484x2","price":20.88,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 10mm】 \/ 2 PCS","offer_id":52442799472914,"sku":"AdaahGFCD04485x2","price":20.73,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 12mm】 \/ 2 PCS","offer_id":52442799505682,"sku":"AdaahGFCD04486x2","price":20.52,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 4mm】 \/ 5 PCS","offer_id":52442799538450,"sku":"AdaahGFCD04481x5","price":47.18,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 5mm】 \/ 5 PCS","offer_id":52442799571218,"sku":"AdaahGFCD04482x5","price":47.04,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 6mm】 \/ 5 PCS","offer_id":52442799603986,"sku":"AdaahGFCD04483x5","price":46.91,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 8mm】 \/ 5 PCS","offer_id":52442799636754,"sku":"AdaahGFCD04484x5","price":46.63,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 10mm】 \/ 5 PCS","offer_id":52442799669522,"sku":"AdaahGFCD04485x5","price":46.23,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 52T 【Bore 12mm】 \/ 5 PCS","offer_id":52442799702290,"sku":"AdaahGFCD04486x5","price":45.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of13_4ddae48f-f893-4786-b943-b920731b4630.jpg?v=1783594558","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-pinion-spur-gear-52-teeth-bore-4-12mm","provider":"HomeDIYer","version":"1.0","type":"link"}