{"product_id":"05-mod-brass-pinion-spur-gear-26-teeth-bore-4-5-6-635-7mm","title":"0.5 Mod Brass Pinion Spur Gear 26 Teeth Bore 4\/5\/6\/6.35\/7mm Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod Brass Pinion Spur Gear 26T — Reliable Torque Transfer for Compact Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a loose or undersized pinion gear causes slippage, noise, or premature wear in your build, the entire drivetrain suffers. Hobbyists, robotics engineers, and small-machine builders who need a dimensionally consistent, metal-bodied spur gear for tight-tolerance assemblies will find this 0.5 mod brass pinion spur gear a dependable solution.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. The 26-tooth profile follows the 0.5 module standard, with an outer diameter of approximately 14 mm (0.55 in) and bore options spanning 4 mm to 7 mm (0.157 in to 0.276 in), including a 6.35 mm (1\/4 in) option for imperial shaft compatibility.\u003c\/p\u003e\n\u003cp\u003eTypical applications include RC car transmission pinion replacement, small servo-driven robotic joints requiring a 0.5 mod spur gear for motor shaft coupling, and compact gearbox assemblies in 3D-printed or CNC-machined enclosures where a brass pinion gear with precise tooth count is required for accurate gear ratio calculation.\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 use with any 0.5 module mating gear. Verify bore diameter matches your motor or drive shaft before ordering. Pairs with 0.5 mod spur, idler, or rack gears of the same module.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 0.5 Mod Brass Pinion 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 corrosion resistance, smooth meshing, and long service life in indoor and light-duty outdoor applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003e0.5 Module Standard\u003c\/strong\u003e\n\u003cp\u003e26-tooth, 0.5 mod profile ensures accurate gear ratio pairing with any standard 0.5 module mating gear or rack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), and 7 mm bores to fit a wide range of motor and drive shafts without adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight\u003c\/strong\u003e\n\u003cp\u003eSmall outer diameter (~14 mm) and low mass make these gears suitable for weight-sensitive builds such as micro robotics and RC drivetrains.\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, 2, 5, or 10 pieces to match prototyping needs or production runs without overstocking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eConsistent Tooth Geometry\u003c\/strong\u003e\n\u003cp\u003eUniform tooth pitch and profile depth across all bore variants ensures repeatable mesh quality when swapping shafts or replacing worn gears.\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\u003e26\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\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eApprox. 14 mm (0.55 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 6.35 \/ 7 mm — See variant options\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 \/ 2 \/ 5 \/ 10 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 size for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly — for example, choose the 6.35 mm bore if your shaft is 1\/4 inch. A bore that is too large will cause runout and slippage; a bore that is too small cannot be pressed on without machining.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs brass strong enough for my drivetrain application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass spur gears are well-suited for low-to-medium torque applications such as RC cars, servo-driven robots, and small gearboxes. For high-torque or high-speed industrial drives, consider steel alternatives. Brass offers quieter operation and better corrosion resistance than mild steel in comparable sizes.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear corrode or tarnish over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass naturally develops a patina in humid environments but does not rust. For applications exposed to moisture, a light coating of machine oil on the tooth faces will slow tarnishing and maintain smooth mesh. The gear is not plated, so the natural brass surface is the working surface.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat mating gear module must I use with this pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear is 0.5 module. It must only mesh with other 0.5 module gears — mixing modules (e.g., pairing with a 0.8 mod gear) will result in incorrect tooth engagement, noise, and rapid wear. Confirm the module of your existing gearset before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear with a 1\/4-inch (imperial) shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 6.35 mm bore variant is sized for a standard 1\/4-inch shaft. This makes it compatible with many North American hobby motors and servo output shafts that use imperial dimensions.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a prototype vs. a production run?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor initial prototyping, the 1 or 2 PCS option lets you validate fit and gear ratio before committing. For small production runs or to keep spares on hand, the 5 or 10 PCS packs offer a lower per-unit cost. Select your quantity in the variant options above.\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 size for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly — for example, choose the 6.35 mm bore if your shaft is 1\/4 inch. A bore that is too large will cause runout and slippage; a bore that is too small cannot be pressed on without machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my drivetrain application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass spur gears are well-suited for low-to-medium torque applications such as RC cars, servo-driven robots, and small gearboxes. For high-torque or high-speed industrial drives, consider steel alternatives. Brass offers quieter operation and better corrosion resistance than mild steel in comparable sizes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode or tarnish over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass naturally develops a patina in humid environments but does not rust. For applications exposed to moisture, a light coating of machine oil on the tooth faces will slow tarnishing and maintain smooth mesh.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear module must I use with this pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear is 0.5 module. It must only mesh with other 0.5 module gears. Confirm the module of your existing gearset before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear with a 1\/4-inch (imperial) shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 6.35 mm bore variant is sized for a standard 1\/4-inch shaft, compatible with many hobby motors and servo output shafts that use imperial dimensions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a prototype vs. a production run?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For initial prototyping, the 1 or 2 PCS option lets you validate fit and gear ratio before committing. For small production runs or to keep spares on hand, the 5 or 10 PCS packs offer a lower per-unit cost.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 26T 【Bore 4mm】 \/ 1 PCS","offer_id":52442804781330,"sku":"AdaahGFCD04383x1","price":8.32,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 5mm】 \/ 1 PCS","offer_id":52442804814098,"sku":"AdaahGFCD04384x1","price":8.32,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6mm】 \/ 1 PCS","offer_id":52442804846866,"sku":"AdaahGFCD04386x1","price":8.58,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6.35mm】 \/ 1 PCS","offer_id":52442804879634,"sku":"AdaahGFCD04387x1","price":8.58,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 7mm】 \/ 1 PCS","offer_id":52442804912402,"sku":"AdaahGFCD04388x1","price":8.58,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 4mm】 \/ 2 PCS","offer_id":52442804945170,"sku":"AdaahGFCD04383x2","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 5mm】 \/ 2 PCS","offer_id":52442804977938,"sku":"AdaahGFCD04384x2","price":12.97,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6mm】 \/ 2 PCS","offer_id":52442805010706,"sku":"AdaahGFCD04386x2","price":13.45,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6.35mm】 \/ 2 PCS","offer_id":52442805043474,"sku":"AdaahGFCD04387x2","price":13.45,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 7mm】 \/ 2 PCS","offer_id":52442805076242,"sku":"AdaahGFCD04388x2","price":13.45,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 4mm】 \/ 5 PCS","offer_id":52442805109010,"sku":"AdaahGFCD04383x5","price":23.81,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 5mm】 \/ 5 PCS","offer_id":52442805141778,"sku":"AdaahGFCD04384x5","price":23.81,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6mm】 \/ 5 PCS","offer_id":52442805174546,"sku":"AdaahGFCD04386x5","price":26.02,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6.35mm】 \/ 5 PCS","offer_id":52442805207314,"sku":"AdaahGFCD04387x5","price":25.88,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 7mm】 \/ 5 PCS","offer_id":52442805240082,"sku":"AdaahGFCD04388x5","price":25.72,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 4mm】 \/ 10 PCS","offer_id":52442805272850,"sku":"AdaahGFCD04383x10","price":42.69,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 5mm】 \/ 10 PCS","offer_id":52442805305618,"sku":"AdaahGFCD04384x10","price":42.55,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6mm】 \/ 10 PCS","offer_id":52442805338386,"sku":"AdaahGFCD04386x10","price":46.99,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 6.35mm】 \/ 10 PCS","offer_id":52442805371154,"sku":"AdaahGFCD04387x10","price":46.85,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 26T 【Bore 7mm】 \/ 10 PCS","offer_id":52442805403922,"sku":"AdaahGFCD04388x10","price":46.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture2of12_178d14db-a26e-48a2-8b61-25bf5efd842c.jpg?v=1783602785","url":"https:\/\/homediyer.com\/products\/05-mod-brass-pinion-spur-gear-26-teeth-bore-4-5-6-635-7mm","provider":"HomeDIYer","version":"1.0","type":"link"}