{"product_id":"05-mod-brass-spur-gear-44-teeth-bore-4-10mm-cnc-pinion-gear","title":"0.5 Mod Brass Pinion Spur Gear 44 Teeth Bore 4\/5\/6\/8\/10mm CNC Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod Brass Spur Gear 44T — Accurate CNC Pinion for Compact Drive Trains\u003c\/h2\u003e\n\u003cp\u003eFinding a 44-tooth spur gear in the correct module and bore size is a recurring challenge for RC builders, robotics engineers, and desktop CNC makers who need a specific tooth count for their gear ratio calculations. A mismatched module or an oversized bore causes backlash, shaft slippage, and premature tooth wear — problems that a correctly specified 0.5 mod brass spur gear eliminates from the start.\u003c\/p\u003e\n\u003cp\u003eThis gear is machined from solid brass and features 44 teeth on a 0.5 Module pitch, giving a pitch circle diameter of 22 mm and an outer diameter of approximately 22.5–23 mm (~0.886–0.906 in). Bore options of 4 mm (~0.157 in), 5 mm (~0.197 in), 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in) cover the most common motor and servo shaft diameters used in hobby and light industrial applications.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: \u003cstrong\u003eCNC axis drive stages\u003c\/strong\u003e where a 44T gear pairs with a smaller pinion to achieve a specific speed reduction; \u003cstrong\u003eservo-driven robotic joints\u003c\/strong\u003e requiring a compact brass gear with low friction and quiet meshing; and \u003cstrong\u003eRC vehicle transmission assemblies\u003c\/strong\u003e where a 44-tooth count provides a useful intermediate ratio between common 36T and 48T options.\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 (Mod 0.5) gear systems. Meshes with any 0.5 Mod rack, pinion, or mating spur gear. Confirm bore diameter matches your 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\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSolid Brass, 44-Tooth Profile\u003c\/strong\u003e\u003cbr\u003eMachined from brass for corrosion resistance and low-friction meshing. The 44T count on a 0.5 Mod pitch gives a pitch circle diameter of 22 mm — useful for gear ratio stages not achievable with standard 36T or 48T options.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e0.5 Module Standard Geometry\u003c\/strong\u003e\u003cbr\u003e20° involute tooth profile ensures accurate mesh with any compatible 0.5 Mod gear or rack. Outer diameter approximately 22.5–23 mm (0.886–0.906 in); face width typically 5–8 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e5 Bore Sizes: 4 \/ 5 \/ 6 \/ 8 \/ 10 mm\u003c\/strong\u003e\u003cbr\u003eCovers the most common metric motor shaft diameters. Select the bore that matches your shaft exactly to avoid runout or slippage without requiring an adapter sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eMulti-Piece Pack Options\u003c\/strong\u003e\u003cbr\u003eAvailable in 1, 2, 5, or 10-piece packs. Multi-piece packs reduce per-unit cost and allow you to stock spares or build symmetric gear stages in a single order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eLow-Backlash Tooth Cut\u003c\/strong\u003e\u003cbr\u003ePrecision-cut involute teeth minimize backlash in closed-loop servo and CNC positioning systems, supporting repeatable positioning in light-duty drive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\u003cbr\u003eSuitable for desktop CNC machines, RC vehicle drivetrains, small robotic arms, 3D printer extruder drives, and educational mechanism kits requiring a 44T reduction stage.\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\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\u003e44T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e22 mm (0.866 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e22.5–23 mm (0.886–0.906 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 mm (see variant options)\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute\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 select the correct bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper and select the matching bore variant — 4, 5, 6, 8, or 10 mm. A bore that is too large will cause shaft runout and slippage under load; a bore that is too small cannot be mounted without machining. If your shaft is a non-standard size, choose the nearest bore and ream to fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the outer diameter of a 44-tooth 0.5 Mod gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eUsing the standard formula OD = (T + 2) × Module: OD = (44 + 2) × 0.5 = 23 mm. In practice, the finished outer diameter is approximately 22.5–23 mm (~0.886–0.906 in) depending on machining tolerance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs brass suitable for my load and speed requirements?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is well-suited for light-to-medium duty applications including RC models, desktop CNC drives, servo-driven robotics, and instrumentation. It offers good machinability and low friction against steel or nylon mating gears. For continuous high-torque or high-RPM industrial drives, a steel gear would provide greater fatigue resistance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow does brass perform in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass does not rust and has natural corrosion resistance in most indoor and light-outdoor environments. In salt-spray, marine, or chemically aggressive conditions, apply a light machine grease or oil to the tooth surfaces to extend service life and prevent surface tarnishing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat gears and racks will mesh with this 44T gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAny 0.5 Module gear or rack with a 20° pressure angle will mesh correctly with this gear, regardless of material (brass, steel, nylon, or acetal). Do not mix module sizes — a 0.5 Mod gear will not mesh correctly with a 0.4 Mod or 0.6 Mod component.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy choose 44 teeth instead of 36T or 48T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 44-tooth count provides an intermediate gear ratio option between the common 36T and 48T sizes. This is useful when your drive system requires a specific speed reduction or torque multiplication that cannot be achieved with standard tooth counts. Calculate your required ratio (driver teeth ÷ driven teeth) to confirm 44T fits your design.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order different bore sizes in the same order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each bore size is a separate variant. Add your chosen bore size and pack quantity to the cart, then return to the product page to add a different bore size variant. All items will be combined into a single order at checkout.\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 select the correct bore size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper and select the matching bore variant — 4, 5, 6, 8, or 10 mm. A bore that is too large will cause shaft runout and slippage under load; a bore that is too small cannot be mounted without machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the outer diameter of a 44-tooth 0.5 Mod gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"OD = (44 + 2) × 0.5 = 23 mm. Finished outer diameter is approximately 22.5–23 mm (~0.886–0.906 in) depending on machining tolerance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass suitable for my load and speed requirements?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is well-suited for light-to-medium duty applications including RC models, desktop CNC drives, servo-driven robotics, and instrumentation. For continuous high-torque or high-RPM industrial drives, a steel gear would provide greater fatigue resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does brass perform in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass does not rust and has natural corrosion resistance in most indoor and light-outdoor environments. In salt-spray or chemically aggressive conditions, apply a light machine grease or oil to the tooth surfaces.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What gears and racks will mesh with this 44T gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Any 0.5 Module gear or rack with a 20° pressure angle will mesh correctly with this gear. Do not mix module sizes — a 0.5 Mod gear will not mesh correctly with a 0.4 Mod or 0.6 Mod component.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why choose 44 teeth instead of 36T or 48T?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 44-tooth count provides an intermediate gear ratio option between the common 36T and 48T sizes. Calculate your required ratio (driver teeth ÷ driven teeth) to confirm 44T fits your design.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order different bore sizes in the same order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each bore size is a separate variant. Add your chosen bore size and pack quantity to the cart, then return to the product page to add a different bore size variant.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 44T 【Bore 4mm】 \/ 1 PCS","offer_id":52442810482962,"sku":"AdaahGFCD04453x1","price":11.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 5mm】 \/ 1 PCS","offer_id":52442810515730,"sku":"AdaahGFCD04454x1","price":11.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 6mm】 \/ 1 PCS","offer_id":52442810548498,"sku":"AdaahGFCD04455x1","price":11.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 8mm】 \/ 1 PCS","offer_id":52442810581266,"sku":"AdaahGFCD04456x1","price":11.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 10mm】 \/ 1 PCS","offer_id":52442810614034,"sku":"AdaahGFCD04457x1","price":11.06,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 4mm】 \/ 2 PCS","offer_id":52442810646802,"sku":"AdaahGFCD04453x2","price":16.31,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 5mm】 \/ 2 PCS","offer_id":52442810679570,"sku":"AdaahGFCD04454x2","price":16.31,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 6mm】 \/ 2 PCS","offer_id":52442810712338,"sku":"AdaahGFCD04455x2","price":16.17,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 8mm】 \/ 2 PCS","offer_id":52442810745106,"sku":"AdaahGFCD04456x2","price":16.17,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 10mm】 \/ 2 PCS","offer_id":52442810777874,"sku":"AdaahGFCD04457x2","price":16.17,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 4mm】 \/ 5 PCS","offer_id":52442810810642,"sku":"AdaahGFCD04453x5","price":36.03,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 5mm】 \/ 5 PCS","offer_id":52442810843410,"sku":"AdaahGFCD04454x5","price":36.03,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 6mm】 \/ 5 PCS","offer_id":52442810876178,"sku":"AdaahGFCD04455x5","price":35.89,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 8mm】 \/ 5 PCS","offer_id":52442810908946,"sku":"AdaahGFCD04456x5","price":35.7,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 10mm】 \/ 5 PCS","offer_id":52442810941714,"sku":"AdaahGFCD04457x5","price":35.35,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 4mm】 \/ 10 PCS","offer_id":52442810974482,"sku":"AdaahGFCD04453x10","price":70.98,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 5mm】 \/ 10 PCS","offer_id":52442811007250,"sku":"AdaahGFCD04454x10","price":70.84,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 6mm】 \/ 10 PCS","offer_id":52442811040018,"sku":"AdaahGFCD04455x10","price":70.71,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 8mm】 \/ 10 PCS","offer_id":52442811072786,"sku":"AdaahGFCD04456x10","price":70.24,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 44T 【Bore 10mm】 \/ 10 PCS","offer_id":52442811105554,"sku":"AdaahGFCD04457x10","price":69.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of12_1cfcb89d-c779-48f7-8d50-6dcbcf1c065c.jpg?v=1783602878","url":"https:\/\/homediyer.com\/products\/05-mod-brass-spur-gear-44-teeth-bore-4-10mm-cnc-pinion-gear","provider":"HomeDIYer","version":"1.0","type":"link"}