{"product_id":"0-5-mod-brass-pinion-spur-gear-30-teeth-bore-4-8mm-transmission-gear","title":"0.5 Mod Brass Pinion Spur Gear 30 Teeth Bore 4\/5\/6\/6.35\/7\/8mm Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e0.5 Mod Brass Pinion Spur Gear 30T — Reliable Transmission for Compact Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped plastic gear or an imprecise bore fit derails your build, the fix demands metal. Hobbyists, robotics engineers, and RC enthusiasts who need a dependable 0.5 module spur gear with a 30-tooth count will find this brass pinion gear engineered for consistent mesh, low backlash, and long service life in tight-tolerance assemblies.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from solid brass stock, offering a balance of machinability, corrosion resistance, and moderate strength suited to light-to-medium load 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) to 8 mm (0.315 in), with an intermediate 6.35 mm (0.250 in \/ ¼ in) option for imperial shaft compatibility. Overall gear outer diameter is approximately 16 mm (0.63 in) at 30 teeth with 0.5 module.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include RC car and truck gearbox rebuilds requiring a 0.5 mod pinion gear replacement, small robotic arm joint drives where a brass transmission gear reduces noise versus steel, and DIY automation projects such as motorized camera sliders or pen plotters that rely on precise 30-tooth spur gear meshing with a matching rack or wheel gear.\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 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    \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.\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\u003e30-Tooth Count for Balanced Gear Ratios\u003c\/strong\u003e — 30T offers a practical mid-range tooth count, enabling flexible ratio pairing with smaller pinions or larger wheel gears across RC and robotics builds.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eSix Bore Sizes: 4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 mm\u003c\/strong\u003e — Covers the most common metric and imperial (¼ in) shaft diameters, eliminating the need for adapters or custom boring in most applications.\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 offer 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\u003e30T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 16 mm (0.63 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 6.35 mm \/ 7 mm \/ 8 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 10–30 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 right bore size for my 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 that matches exactly — 4 mm, 5 mm, 6 mm, 6.35 mm (¼ in), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small cannot be pressed on without machining. If your shaft is imperial ¼ in (6.35 mm), select the 6.35 mm bore variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat gear module must the mating gear be to mesh with this 30T 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. 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 application?\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 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 if used outdoors or in humid conditions?\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, consider applying a light machine oil or grease to the tooth faces and bore.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the center distance between this gear and a mating pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (T1 + T2) × Module \/ 2. For this 30T gear meshing with, for example, a 10T pinion: (30 + 10) × 0.5 \/ 2 = \u003cstrong\u003e10 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\u003eCan I use these gears with a set screw or do I need to press-fit them?\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 into the hub is the most common method for this gear size — drill and tap a radial hole in the hub if not pre-drilled. Alternatively, a light interference press-fit or retaining compound (e.g., Loctite 638) can be used for permanent installation. Check the hub wall thickness against your bore size before tapping.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I decide between buying 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 is ideal for classroom kits, recurring builds, or stocking a workshop.\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 motor or drive shaft diameter with a caliper. Select the bore that matches exactly — 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small cannot be pressed on without machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What gear module must the mating gear be to mesh with this 30T 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 application?\",\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 if used outdoors or in humid conditions?\",\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, which does not significantly affect function. 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 between this gear and a mating pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (T1 + T2) × Module \/ 2. For this 30T gear meshing with a 10T pinion: (30 + 10) × 0.5 \/ 2 = 10 mm. Substitute your mating gear tooth count to calculate the exact center distance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with a set screw or do I need to press-fit them?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The bore is machined to a close sliding fit. For secure shaft retention, a set screw tapped into the hub is the most common 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 decide between buying 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 if you have two axes or want 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 30T 【Bore 4mm】 \/ 1 PCS","offer_id":52442806288658,"sku":"AdaahGFCD04395x1","price":8.74,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 5mm】 \/ 1 PCS","offer_id":52442806321426,"sku":"AdaahGFCD04396x1","price":8.74,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6mm】 \/ 1 PCS","offer_id":52442806354194,"sku":"AdaahGFCD04397x1","price":8.74,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6.35mm】 \/ 1 PCS","offer_id":52442806386962,"sku":"AdaahGFCD04398x1","price":8.74,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 7mm】 \/ 1 PCS","offer_id":52442806419730,"sku":"AdaahGFCD04399x1","price":8.98,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 8mm】 \/ 1 PCS","offer_id":52442806452498,"sku":"AdaahGFCD04400x1","price":8.98,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 4mm】 \/ 2 PCS","offer_id":52442806485266,"sku":"AdaahGFCD04395x2","price":14.09,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 5mm】 \/ 2 PCS","offer_id":52442806518034,"sku":"AdaahGFCD04396x2","price":14.09,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6mm】 \/ 2 PCS","offer_id":52442806550802,"sku":"AdaahGFCD04397x2","price":14.09,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6.35mm】 \/ 2 PCS","offer_id":52442806583570,"sku":"AdaahGFCD04398x2","price":14.09,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 7mm】 \/ 2 PCS","offer_id":52442806616338,"sku":"AdaahGFCD04399x2","price":14.67,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 8mm】 \/ 2 PCS","offer_id":52442806649106,"sku":"AdaahGFCD04400x2","price":14.67,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 4mm】 \/ 5 PCS","offer_id":52442806681874,"sku":"AdaahGFCD04395x5","price":26.6,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 5mm】 \/ 5 PCS","offer_id":52442806714642,"sku":"AdaahGFCD04396x5","price":26.47,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6mm】 \/ 5 PCS","offer_id":52442806747410,"sku":"AdaahGFCD04397x5","price":26.4,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6.35mm】 \/ 5 PCS","offer_id":52442806780178,"sku":"AdaahGFCD04398x5","price":26.32,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 7mm】 \/ 5 PCS","offer_id":52442806812946,"sku":"AdaahGFCD04399x5","price":27.87,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 8mm】 \/ 5 PCS","offer_id":52442806845714,"sku":"AdaahGFCD04400x5","price":27.66,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 4mm】 \/ 10 PCS","offer_id":52442806878482,"sku":"AdaahGFCD04395x10","price":47.99,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 5mm】 \/ 10 PCS","offer_id":52442806911250,"sku":"AdaahGFCD04396x10","price":47.86,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6mm】 \/ 10 PCS","offer_id":52442806944018,"sku":"AdaahGFCD04397x10","price":47.72,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 6.35mm】 \/ 10 PCS","offer_id":52442806976786,"sku":"AdaahGFCD04398x10","price":47.59,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 7mm】 \/ 10 PCS","offer_id":52442807009554,"sku":"AdaahGFCD04399x10","price":53.11,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 30T 【Bore 8mm】 \/ 10 PCS","offer_id":52442807042322,"sku":"AdaahGFCD04400x10","price":52.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of13_ccfedea0-a7d7-40bd-a1c1-6ce9d8bc745e.jpg?v=1783602816","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-pinion-spur-gear-30-teeth-bore-4-8mm-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}