{"product_id":"0-5-mod-brass-pinion-spur-gear-22-teeth-bore-4-5-6-6-35-8mm-transmission-gear","title":"0.5 Mod Brass Pinion Spur Gear 22 Teeth Bore 4\/5\/6\/6.35\/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 22T — Reliable Transmission for Precision Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped plastic gear or an undersized pinion brings your build to a halt, you need a drop-in replacement that holds up under load. Hobbyists, robotics engineers, and small-machine builders who demand dimensional accuracy and corrosion resistance turn to the 0.5 mod brass pinion spur gear as their go-to transmission component.\u003c\/p\u003e\n\u003cp\u003eThis spur gear is machined from solid brass, offering a balance of machinability, low friction, and natural corrosion resistance without surface coatings. The module is 0.5 (metric), with 22 teeth, and is available in five bore diameters — 4 mm (0.157 in), 5 mm (0.197 in), 6 mm (0.236 in), 6.35 mm (0.250 in \/ 1\/4 in), and 8 mm (0.315 in) — to suit a wide range of motor shaft sizes. Outer diameter is approximately 12 mm (0.47 in) based on the formula (T + 2) × module.\u003c\/p\u003e\n\u003cp\u003eTypical applications include RC car and truck drivetrains requiring a compact 0.5 mod pinion, tabletop robotics gearboxes pairing with a matching 0.5 mod spur gear, and small automation or clock-mechanism assemblies where a low-backlash brass transmission gear is essential for consistent torque transfer.\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 (Mod 0.5) mating gear. Verify your motor shaft diameter before selecting a bore size. Pairs with 0.5 mod racks, worm gears, and matching spur gears.\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 inherent corrosion resistance, smooth meshing, and a longer service life compared to plastic alternatives in demanding environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 0.5 — 22 Teeth\u003c\/strong\u003e\n\u003cp\u003eStandard metric 0.5 module pitch ensures accurate meshing with any compatible 0.5 mod gear, rack, or pinion without custom modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eFive Bore Options: 4 \/ 5 \/ 6 \/ 6.35 \/ 8 mm\u003c\/strong\u003e\n\u003cp\u003eSelect the bore that matches your motor or drive shaft — including the common 1\/4-inch (6.35 mm) shaft used in many hobby and light-industrial motors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eLow-Friction Transmission\u003c\/strong\u003e\n\u003cp\u003eBrass-on-steel or brass-on-brass meshing produces minimal friction and heat, supporting continuous-duty cycles in robotics and automation rigs.\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, 5, or 10-piece packs — order a single replacement or stock up for a full project build without overpaying for bulk minimums.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDirect Drop-In Replacement\u003c\/strong\u003e\n\u003cp\u003eStandardized 0.5 mod tooth profile means this pinion gear slots directly into existing gearboxes designed for Mod 0.5 components, minimizing downtime.\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\u003e22T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 6.35 mm \/ 8 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~12 mm (0.47 in)\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\u003c\/th\u003e\n\u003ctd\u003eStandard involute spur\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\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub \/ Boss\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 right 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. Match it to the available bore options: 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), or 8 mm. If your shaft is slightly undersized, a set screw or shaft collar can secure the gear; if oversized, the gear will not fit and must not be forced.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"0.5 Mod\" mean, and will this gear mesh with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"Mod\" (module) is the metric standard for gear tooth size. A 0.5 module gear will only mesh correctly with other 0.5 module gears of the same pressure angle (20°). It is not interchangeable with DP (diametral pitch) gears used in some imperial systems without conversion verification.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs brass strong enough for my RC car or robotics application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass offers good strength for light-to-medium torque applications such as RC car pinions, small robot joints, and clock mechanisms. For high-torque or high-RPM industrial drives, consider steel gears. Brass excels where corrosion resistance, low noise, and smooth meshing matter more than maximum load capacity.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear corrode or rust over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is naturally corrosion-resistant and does not rust. It may develop a patina (surface oxidation) over time in humid environments, but this does not significantly affect mechanical performance. No additional coating or treatment is required for typical indoor or light-outdoor use.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a typical project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a single motor drive, 1 PCS is sufficient. For a dual-motor or mirrored drivetrain, select 2 PCS. The 5 PCS and 10 PCS packs offer better per-unit value for multi-axis robots, batch builds, or keeping spares on hand for maintenance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the outer diameter of a 22-tooth, 0.5 mod gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe outer (tip) diameter of a spur gear is calculated as (Number of Teeth + 2) × Module = (22 + 2) × 0.5 = 12 mm (approximately 0.47 inches). This is the maximum envelope diameter to account for in your housing or gearbox design.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pinion gear with a 0.5 mod rack for linear motion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. A 0.5 mod spur pinion meshes correctly with a 0.5 mod rack of the same pressure angle (20°), making it suitable for compact linear actuators, camera sliders, and small CNC axis drives where a rack-and-pinion arrangement is preferred.\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 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 motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper. Match it to the available bore options: 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), or 8 mm. If your shaft is slightly undersized, a set screw or shaft collar can secure the gear; if oversized, the gear will not fit and must not be forced.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does '0.5 Mod' mean, and will this gear mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"'Mod' (module) is the metric standard for gear tooth size. A 0.5 module gear will only mesh correctly with other 0.5 module gears of the same pressure angle (20°). It is not interchangeable with DP (diametral pitch) gears used in some imperial systems without conversion verification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is brass strong enough for my RC car or robotics application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass offers good strength for light-to-medium torque applications such as RC car pinions, small robot joints, and clock mechanisms. For high-torque or high-RPM industrial drives, consider steel gears. Brass excels where corrosion resistance, low noise, and smooth meshing matter more than maximum load capacity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode or rust over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is naturally corrosion-resistant and does not rust. It may develop a patina over time in humid environments, but this does not significantly affect mechanical performance. No additional coating or treatment is required for typical indoor or light-outdoor use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a typical project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a single motor drive, 1 PCS is sufficient. For a dual-motor or mirrored drivetrain, select 2 PCS. The 5 PCS and 10 PCS packs offer better per-unit value for multi-axis robots, batch builds, or keeping spares on hand for maintenance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the outer diameter of a 22-tooth, 0.5 mod gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The outer (tip) diameter is calculated as (22 + 2) × 0.5 = 12 mm (approximately 0.47 inches). Account for this envelope diameter in your housing or gearbox design.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this pinion gear with a 0.5 mod rack for linear motion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A 0.5 mod spur pinion meshes correctly with a 0.5 mod rack of the same pressure angle (20°), making it suitable for compact linear actuators, camera sliders, and small CNC axis drives.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 22T 【Bore 4mm】 \/ 1 PCS","offer_id":52442803077394,"sku":"AdaahGFCD04368x1","price":8.08,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 5mm】 \/ 1 PCS","offer_id":52442803110162,"sku":"AdaahGFCD04369x1","price":8.08,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6mm】 \/ 1 PCS","offer_id":52442803142930,"sku":"AdaahGFCD04370x1","price":8.26,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6.35mm】 \/ 1 PCS","offer_id":52442803175698,"sku":"AdaahGFCD04371x1","price":8.26,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 8mm】 \/ 1 PCS","offer_id":52442803208466,"sku":"AdaahDZ31158x1","price":8.26,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 4mm】 \/ 2 PCS","offer_id":52442803241234,"sku":"AdaahGFCD04368x2","price":12.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 5mm】 \/ 2 PCS","offer_id":52442803274002,"sku":"AdaahGFCD04369x2","price":12.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6mm】 \/ 2 PCS","offer_id":52442803306770,"sku":"AdaahGFCD04370x2","price":12.81,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6.35mm】 \/ 2 PCS","offer_id":52442803339538,"sku":"AdaahGFCD04371x2","price":12.81,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 8mm】 \/ 2 PCS","offer_id":52442803372306,"sku":"AdaahDZ31158x2","price":12.81,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 4mm】 \/ 5 PCS","offer_id":52442803405074,"sku":"AdaahGFCD04368x5","price":22.44,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 5mm】 \/ 5 PCS","offer_id":52442803437842,"sku":"AdaahGFCD04369x5","price":22.44,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6mm】 \/ 5 PCS","offer_id":52442803470610,"sku":"AdaahGFCD04370x5","price":23.66,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6.35mm】 \/ 5 PCS","offer_id":52442803503378,"sku":"AdaahGFCD04371x5","price":23.51,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 8mm】 \/ 5 PCS","offer_id":52442803536146,"sku":"AdaahDZ31158x5","price":24.1,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 4mm】 \/ 10 PCS","offer_id":52442803568914,"sku":"AdaahGFCD04368x10","price":39.37,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 5mm】 \/ 10 PCS","offer_id":52442803601682,"sku":"AdaahGFCD04369x10","price":39.24,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6mm】 \/ 10 PCS","offer_id":52442803634450,"sku":"AdaahGFCD04370x10","price":42.64,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 6.35mm】 \/ 10 PCS","offer_id":52442803667218,"sku":"AdaahGFCD04371x10","price":42.42,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 22T 【Bore 8mm】 \/ 10 PCS","offer_id":52442803699986,"sku":"AdaahDZ31158x10","price":43.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture5of12_8ee9a314-cd55-4269-8010-8e79c9a41dc2.jpg?v=1783596331","url":"https:\/\/homediyer.com\/products\/0-5-mod-brass-pinion-spur-gear-22-teeth-bore-4-5-6-6-35-8mm-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}