{"product_id":"0-5-mod-brass-spur-gear-35-teeth-bore-4-12mm-transmission-pinion-gear","title":"0.5 Mod Brass Spur Gear 35 Teeth Bore 4~12mm Motor Gear Transmission Pinion Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e0.5 Mod Brass Spur Gear 35T — Precision Transmission Pinion for Motor Drives and Robotics\u003c\/h2\u003e\n    \u003cp\u003eWhen a worn or undersized gear introduces slop into your drivetrain, every downstream axis pays the price. Makers, RC builders, and automation engineers who need a dependable 0.5 module spur gear with a 35-tooth count will find this brass pinion gear machined for consistent mesh, low backlash, and long service life across a wide range of shaft diameters — from compact 4 mm motor shafts up to robust 12 mm drive shafts.\u003c\/p\u003e\n    \u003cp\u003eEach gear is turned from solid brass stock, delivering a practical balance of machinability, corrosion resistance, and moderate load capacity suited to light-to-medium duty transmission. The 0.5 module (Mod 0.5) tooth profile conforms to standard DIN\/ISO gear geometry. Bore options span 4 mm (0.157 in) through 12 mm (0.472 in), including a 6.35 mm (0.250 in \/ ¼ in) option for imperial shaft compatibility. At 35 teeth with Mod 0.5, the outer diameter is approximately 18.5 mm (0.73 in).\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include RC truck and crawler gearbox rebuilds requiring a 0.5 mod 35-tooth pinion gear replacement, multi-axis robotic arm joints where a brass transmission gear reduces audible noise versus steel, and DIY CNC or pen-plotter builds that pair this 35T spur gear with a matching rack or smaller motor pinion to achieve precise, repeatable motion.\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 standard 0.5 module (Mod 0.5) spur gear, rack, or pinion. Verify your shaft diameter matches the 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    \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 environments, and runs quietly against mating plastic or metal gears without galling.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStandard 0.5 Module Tooth Profile\u003c\/strong\u003e — Conforms to DIN\/ISO Mod 0.5 geometry for reliable mesh with any compatible 0.5 mod gear, rack, or pinion in your drivetrain.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e35-Tooth Count for Flexible Gear Ratios\u003c\/strong\u003e — 35T provides a slightly larger pitch diameter than 30T, enabling finer ratio steps and smoother torque transfer when paired with smaller motor pinions.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eEight Bore Sizes: 4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 mm\u003c\/strong\u003e — The widest bore selection in this module range, covering metric and imperial (¼ in) shafts from small hobby motors up to mid-size stepper and servo shafts.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities: 1 \/ 2 \/ 5 \/ 10 PCS\u003c\/strong\u003e — Order a single replacement or stock up for production runs and multi-axis builds; bulk packs deliver per-unit savings.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eLow-Backlash Precision Machining\u003c\/strong\u003e — Tight dimensional tolerances on bore and tooth profile minimize play, supporting smooth, repeatable motion in servo-driven and stepper-driven systems.\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\u003e35T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 18.5 mm (0.73 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 mm\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 Standard\u003c\/th\u003e\n\u003ctd\u003eDIN \/ ISO Mod 0.5\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\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\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 PCS (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApproximate Weight (per piece)\u003c\/th\u003e\n\u003ctd\u003eTypically 15–40 g depending on bore\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 correct bore size for my motor or drive shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper and select the matching bore: 4, 5, 6, 6.35, 7, 8, 10, or 12 mm. A bore that is too large causes runout and vibration; one that is too small cannot be mounted without machining. If your shaft is imperial ¼ in (6.35 mm), select the 6.35 mm bore variant. For 10 mm and 12 mm shafts — common on NEMA 23 stepper motors and mid-size servo motors — choose those respective bore options.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat module must the mating gear be to mesh correctly with this 35T gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe mating gear must also be \u003cstrong\u003e0.5 module (Mod 0.5)\u003c\/strong\u003e. Module is not interchangeable — a Mod 0.8 or Mod 1.0 gear will not mesh correctly and will cause rapid wear or binding. Always confirm the module of your existing gearset before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs brass strong enough for my torque requirements?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is well-suited for light-to-medium torque applications such as RC vehicles, small robots, camera rigs, and pen plotters. It offers better wear resistance than plastic and runs quietly. For high-torque or high-speed industrial drives, consider steel gears instead. If your motor stall torque exceeds approximately 0.5–0.8 N·m at this gear size, evaluate whether brass meets your load requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear corrode in outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has inherent corrosion resistance and will not rust like steel. In outdoor or humid environments it may develop a patina over time, which does not significantly affect function. For salt-spray or submerged environments, apply a light machine oil or grease to the tooth faces and bore to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the center distance when meshing this 35T gear with a smaller pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (T1 + T2) × Module \/ 2. For this 35T gear meshing with a 15T pinion: (35 + 15) × 0.5 \/ 2 = \u003cstrong\u003e12.5 mm\u003c\/strong\u003e. Substitute your mating gear's tooth count to calculate the exact center distance for your design.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I secure the gear to the shaft — set screw or press-fit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe bore is machined to a close sliding fit. For secure shaft retention, a set screw (grub screw) tapped radially into the hub is the most common method. Alternatively, a light interference press-fit or retaining compound (e.g., Loctite 638) can be used for permanent installation. For larger bores (10–12 mm), verify hub wall thickness is sufficient before tapping a set screw hole.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between 1, 2, 5, or 10 pieces?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder \u003cstrong\u003e1 PCS\u003c\/strong\u003e for a single repair or prototype. Choose \u003cstrong\u003e2 PCS\u003c\/strong\u003e if you have two axes or want a spare on hand. Select \u003cstrong\u003e5 PCS\u003c\/strong\u003e for multi-axis robots or small production batches. The \u003cstrong\u003e10 PCS\u003c\/strong\u003e pack offers the lowest per-unit cost and suits classroom kits, recurring builds, or workshop stocking.\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 correct bore size for my motor or drive shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper and select the matching bore: 4, 5, 6, 6.35, 7, 8, 10, or 12 mm. If your shaft is imperial 1\/4 in (6.35 mm), select the 6.35 mm bore variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What module must the mating gear be to mesh correctly with this 35T gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The mating gear must also be 0.5 module (Mod 0.5). Module is not interchangeable — a Mod 0.8 or Mod 1.0 gear will not mesh correctly and will cause rapid wear or binding.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my torque requirements?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is well-suited for light-to-medium torque applications such as RC vehicles, small robots, camera rigs, and pen plotters. For high-torque or high-speed industrial drives, consider steel gears instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode in outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has inherent corrosion resistance and will not rust like steel. In outdoor or humid environments it may develop a patina over time. Apply a light machine oil or grease for salt-spray or submerged environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the center distance when meshing this 35T gear with a smaller pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (T1 + T2) x Module \/ 2. For this 35T gear meshing with a 15T pinion: (35 + 15) x 0.5 \/ 2 = 12.5 mm. Substitute your mating gear tooth count to calculate the exact center distance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I secure the gear to the shaft — set screw or press-fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The bore is machined to a close sliding fit. A set screw tapped radially into the hub is the most common retention method. Alternatively, a light interference press-fit or retaining compound can be used for permanent installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between 1, 2, 5, or 10 pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order 1 PCS for a single repair or prototype. Choose 2 PCS for two axes or a spare. Select 5 PCS for multi-axis robots or small batches. The 10 PCS pack offers the lowest per-unit cost for classroom kits, recurring builds, or workshop stocking.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 35T 【Bore 4mm】 \/ 1 PCS","offer_id":52442808254738,"sku":"AdaahGFCD04417x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 35T 【Bore 5mm】 \/ 1 PCS","offer_id":52442808287506,"sku":"AdaahGFCD04418x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 35T 【Bore 6mm】 \/ 1 PCS","offer_id":52442808320274,"sku":"AdaahGFCD04419x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 35T 【Bore 6.35mm】 \/ 1 PCS","offer_id":52442808353042,"sku":"AdaahGFCD04420x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 35T 【Bore 7mm】 \/ 1 PCS","offer_id":52442808385810,"sku":"AdaahGFCD04421x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 35T 【Bore 8mm】 \/ 1 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