{"product_id":"0-5-mod-brass-pinion-spur-gear-50-teeth-bore-4-12mm-transmission-gear","title":"0.5 Mod Brass Pinion Spur Gear 50 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 50T — Precision Transmission for Compact Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen your build demands tight tolerances and reliable torque transfer in a small footprint, a poorly matched gear can cause backlash, premature wear, or outright failure. Engineers, hobbyists, and makers working on compact mechanical assemblies need a spur gear that holds its dimensions under load — and that is exactly what this 0.5 Module brass pinion spur gear is designed to deliver.\u003c\/p\u003e\n    \u003cp\u003eThis gear features a 0.5 Module (Mod 0.5) tooth profile with 50 teeth, machined from brass for a balance of machinability, corrosion resistance, and moderate strength. The bore is available in six sizes — 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approximately 0.157\", 0.197\", 0.236\", 0.315\", 0.394\", and 0.472\") — to suit a wide range of shaft diameters. Overall gear outer diameter is approximately 26 mm (≈1.02\"), with a face width typically in the 5–8 mm range depending on the variant.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include RC car transmission stages requiring a 0.5 mod spur gear replacement, small robotics joint drives where a brass pinion gear 50 tooth provides low-noise meshing, and precision instrument mechanisms or clock-style gear trains where dimensional consistency across a multi-gear stack is critical.\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 mating spur gear. Verify shaft diameter matches your selected bore 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\u003eBrass Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from brass alloy for reliable corrosion resistance, smooth meshing noise characteristics, and ease of secondary machining if custom fitting is needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e0.5 Module \/ 50-Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eStandard Mod 0.5 tooth geometry ensures accurate meshing with any compatible 0.5 mod rack or gear. 50 teeth deliver a well-balanced ratio for compact drive stages.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eSix Bore Options (4–12 mm)\u003c\/strong\u003e\n        \u003cp\u003eChoose from bore diameters of 4, 5, 6, 8, 10, or 12 mm to match your shaft without additional boring or bushing work.\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, 2, or 5-piece packs so you can order exactly what your project requires — from a single replacement to a small production run.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eConsistent Dimensional Accuracy\u003c\/strong\u003e\n        \u003cp\u003eMachined to maintain tooth pitch and bore concentricity, reducing backlash and ensuring repeatable performance across multiple gears in a gear train.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e\n        \u003cp\u003eSuited for RC vehicles, robotics, automation mechanisms, scientific instruments, and DIY mechanical projects requiring a reliable 0.5 mod transmission gear.\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 (Mod 0.5)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e50T\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 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~26 mm (~1.02\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (approx.)\u003c\/th\u003e\n\u003ctd\u003eTypically 5–8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute spur\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, approx.)\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 calipers and select the matching bore option — 4, 5, 6, 8, 10, or 12 mm. The bore should be a close sliding fit on the shaft; you can secure the gear with a set screw, adhesive, or press fit depending on your application's torque requirements.\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 or rack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear or rack with a 0.5 Module (Mod 0.5) tooth profile and a standard 20° pressure angle will mesh correctly with this gear. Confirm the module and pressure angle of your mating component before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs brass strong enough for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass offers moderate tensile strength (typically 300–500 MPa depending on alloy) and is well-suited for light-to-medium load applications such as RC vehicles, robotics joints, and instrument mechanisms. For heavy-load or high-speed industrial drives, consider steel alternatives. Brass also provides inherent corrosion resistance without surface treatment.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow corrosion-resistant is this gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass naturally resists oxidation and mild corrosion in indoor and light outdoor environments. It does not require additional coating for most hobby and light-industrial uses. Avoid prolonged exposure to strong acids, ammonia-based compounds, or salt spray environments without additional protection.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use multiple gears from this listing in the same gear train?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Because all gears share the same 0.5 Module and 50-tooth count, they are dimensionally consistent and will mesh with each other or with other Mod 0.5 components. Order the 5-piece pack for multi-stage gear train builds to ensure matched tolerances across the set.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 1 PCS, 2 PCS, and 5 PCS pack options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pack quantity determines how many individual gears you receive at the listed price. The 2-piece and 5-piece packs offer a lower per-unit cost compared to buying singles. Choose based on how many gears your project requires or how many spares you want to keep on hand.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs a set screw or keyway included?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are supplied as plain-bore gears without a pre-drilled set screw hole or keyway. If your application requires a set screw, the brass material is easy to drill and tap. Contact us to confirm current bore specifications before machining.\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 shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with calipers and select the matching bore option — 4, 5, 6, 8, 10, or 12 mm. The bore should be a close sliding fit on the shaft; you can secure the gear with a set screw, adhesive, or press fit depending on your application's torque requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 0.5 mod gears or rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any gear or rack with a 0.5 Module (Mod 0.5) tooth profile and a standard 20° pressure angle will mesh correctly with this gear. Confirm the module and pressure angle of your mating component before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass offers moderate tensile strength (typically 300–500 MPa depending on alloy) and is well-suited for light-to-medium load applications such as RC vehicles, robotics joints, and instrument mechanisms. For heavy-load or high-speed industrial drives, consider steel alternatives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How corrosion-resistant is this gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass naturally resists oxidation and mild corrosion in indoor and light outdoor environments. It does not require additional coating for most hobby and light-industrial uses.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use multiple gears from this listing in the same gear train?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Because all gears share the same 0.5 Module and 50-tooth count, they are dimensionally consistent and will mesh with each other or with other Mod 0.5 components.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 1 PCS, 2 PCS, and 5 PCS pack options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The pack quantity determines how many individual gears you receive at the listed price. The 2-piece and 5-piece packs offer a lower per-unit cost compared to buying singles.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is a set screw or keyway included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are supplied as plain-bore gears without a pre-drilled set screw hole or keyway. The brass material is easy to drill and tap if your application requires a set screw.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 50T 【Bore 4mm】 \/ 1 PCS","offer_id":52442797441298,"sku":"AdaahGFCD04475x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 5mm】 \/ 1 PCS","offer_id":52442797474066,"sku":"AdaahGFCD04476x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 6mm】 \/ 1 PCS","offer_id":52442797506834,"sku":"AdaahGFCD04477x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 8mm】 \/ 1 PCS","offer_id":52442797539602,"sku":"AdaahGFCD04478x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 10mm】 \/ 1 PCS","offer_id":52442797572370,"sku":"AdaahGFCD04479x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 12mm】 \/ 1 PCS","offer_id":52442797605138,"sku":"AdaahGFCD04480x1","price":12.27,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 4mm】 \/ 2 PCS","offer_id":52442797637906,"sku":"AdaahGFCD04475x2","price":19.69,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 5mm】 \/ 2 PCS","offer_id":52442797670674,"sku":"AdaahGFCD04476x2","price":19.64,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 6mm】 \/ 2 PCS","offer_id":52442797703442,"sku":"AdaahGFCD04477x2","price":19.54,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 8mm】 \/ 2 PCS","offer_id":52442797736210,"sku":"AdaahGFCD04478x2","price":19.41,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 10mm】 \/ 2 PCS","offer_id":52442797768978,"sku":"AdaahGFCD04479x2","price":19.24,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 12mm】 \/ 2 PCS","offer_id":52442797801746,"sku":"AdaahGFCD04480x2","price":19.05,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 4mm】 \/ 5 PCS","offer_id":52442797834514,"sku":"AdaahGFCD04475x5","price":43.78,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 5mm】 \/ 5 PCS","offer_id":52442797867282,"sku":"AdaahGFCD04476x5","price":43.64,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 6mm】 \/ 5 PCS","offer_id":52442797900050,"sku":"AdaahGFCD04477x5","price":43.59,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 8mm】 \/ 5 PCS","offer_id":52442797932818,"sku":"AdaahGFCD04478x5","price":43.23,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 10mm】 \/ 5 PCS","offer_id":52442797965586,"sku":"AdaahGFCD04479x5","price":42.83,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 50T 【Bore 12mm】 \/ 5 PCS","offer_id":52442797998354,"sku":"AdaahGFCD04480x5","price":42.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture2of13_f2e4b24b-3885-4499-88d8-e1ac58d179b9.jpg?v=1783594530","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-pinion-spur-gear-50-teeth-bore-4-12mm-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}