{"product_id":"0-5-mod-brass-spur-gear-34t-bore-4-10mm-pinion-gear","title":"0.5 Mod Brass Spur Gear 34 Teeth Bore 4~10mm 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 34T — Precision Pinion Gear for Motor Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen your motor shaft needs a reliable, low-backlash mesh partner, undersized or poorly machined gears cause slippage, noise, and premature wear that stalls your entire project. Hobbyists building RC vehicles, robotics engineers prototyping drive trains, and small-machine designers all need a gear they can trust to hold tolerance run after run.\u003c\/p\u003e\n    \u003cp\u003eThis 0.5 module brass spur gear features 34 teeth machined to DIN\/JIS gear standards. The body is solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. Bore options span 4 mm to 10 mm (approximately 5\/32 in to 25\/64 in), with select variants including a stepped bore (14 mm or 15 mm step) for shaft-shoulder registration. Outer diameter is approximately 17.5 mm (≈ 0.69 in); face width is typically 5–8 mm depending on bore variant.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: pairing with 0.5 mod motor pinions in RC car steering and drive systems; building compact gear reduction stages in desktop CNC or 3D printer extruder assemblies; and integrating into educational robotics kits where a 34-tooth brass spur gear provides a known, repeatable gear ratio for torque-speed calculations.\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    Compatible with all \u003cstrong\u003e0.5 Module (Mod 0.5)\u003c\/strong\u003e mating gears and racks. Verify bore diameter matches your motor or 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    \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 — Machines cleanly, resists corrosion in humid or lightly oiled environments, and runs quietly against steel or plastic mating gears.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e34 Teeth, 0.5 Module\u003c\/strong\u003e — Consistent tooth profile ensures smooth mesh with any standard Mod 0.5 gear or rack, minimizing backlash in precision drive applications.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range (4–10 mm)\u003c\/strong\u003e — Nine bore size options from 4 mm to 10 mm cover the most common hobby motor and stepper motor shaft diameters without custom machining.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eStepped Bore Variants Available\u003c\/strong\u003e — Select 8 mm bore variants include a 14 mm or 15 mm shoulder step for positive axial location on stepped shafts, eliminating the need for separate shaft collars.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, 5, or 10-piece packs so you can order exactly what your build requires, from single prototypes to small production runs.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n        \u003cstrong\u003eCompact, Lightweight Profile\u003c\/strong\u003e — At approximately 17.5 mm OD and a slim face width, these gears fit into tight motor bays and compact gearbox housings where space is at a premium.\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\u003e34T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e17 mm (0.669 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e18 mm (0.709 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 mm)\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\u003eStep Bore Shoulder\u003c\/th\u003e\n\u003ctd\u003e14 mm or 15 mm (select 8 mm bore variants only)\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\u003eGear Standard\u003c\/th\u003e\n\u003ctd\u003eDIN \/ JIS Mod 0.5\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\u003eSee variant options (1 \/ 2 \/ 5 \/ 10 PCS)\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 motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with calipers. Common hobby motor shafts are 3 mm, 4 mm, 5 mm, or 6 mm; stepper motors often use 5 mm or 6.35 mm (1\/4 in) shafts. Select the bore that matches your shaft exactly — a loose fit will cause slippage under load. If your shaft is between sizes, choose the smaller bore and carefully ream or hone to final dimension.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the standard 8 mm bore and the stepped 8 mm bore variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe standard 8 mm bore runs straight through the gear hub. The stepped variants (8 mm bore with 14 mm step or 15 mm step) have a larger-diameter shoulder machined into one face of the hub. This shoulder registers against a shaft step or bearing face, providing positive axial positioning without a separate collar or circlip. Choose the stepped variant when your shaft has a matching shoulder diameter of 14 mm or 15 mm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing 0.5 module plastic or steel gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module is a universal tooth-size standard — any two gears of the same module and pressure angle will mesh correctly regardless of material. This 0.5 Mod 34T brass gear will mesh with 0.5 Mod plastic, steel, or aluminum gears and racks. Confirm the mating gear is also 20° pressure angle (the most common standard) for optimal tooth contact.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is brass compared to steel for this application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has a tensile strength of approximately 300–500 MPa depending on alloy, compared to 400–800 MPa for common carbon steel. For light-duty applications — RC vehicles, robotics, small automation, and educational projects — brass provides more than adequate strength while offering superior machinability, lower noise, and natural corrosion resistance. For high-torque or high-cycle industrial drives, consider steel alternatives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes brass corrode, and do I need to lubricate these gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is naturally corrosion-resistant in most indoor and lightly humid environments and will not rust. For best performance and longevity, apply a light machine oil or white lithium grease to the tooth faces, especially in continuous-duty applications. Avoid heavy greases that can attract abrasive particles in dusty environments.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat gear ratio will I get pairing this 34T gear with a common motor pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio = driven teeth ÷ driver teeth. Pairing this 34T gear with a 17T motor pinion gives a 2:1 reduction (torque doubles, speed halves). With a 10T pinion the ratio is 3.4:1; with a 8T pinion it is 4.25:1. Use these ratios to calculate output RPM and torque for your specific motor and load requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I order a single piece to test fit before buying in bulk?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 1 PCS pack option is available for every bore size, allowing you to verify fit, mesh quality, and dimensional accuracy before committing to a 5 or 10-piece order. Multi-piece packs offer a lower per-unit cost for production or replacement stock.\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 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 calipers. Common hobby motor shafts are 3 mm, 4 mm, 5 mm, or 6 mm; stepper motors often use 5 mm or 6.35 mm (1\/4 in) shafts. Select the bore that matches your shaft exactly — a loose fit will cause slippage under load. If your shaft is between sizes, choose the smaller bore and carefully ream or hone to final dimension.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the standard 8 mm bore and the stepped 8 mm bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The standard 8 mm bore runs straight through the gear hub. The stepped variants (8 mm bore with 14 mm step or 15 mm step) have a larger-diameter shoulder machined into one face of the hub. This shoulder registers against a shaft step or bearing face, providing positive axial positioning without a separate collar or circlip.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 0.5 module plastic or steel gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two gears of the same module and pressure angle will mesh correctly regardless of material. This 0.5 Mod 34T brass gear will mesh with 0.5 Mod plastic, steel, or aluminum gears and racks. Confirm the mating gear is also 20° pressure angle for optimal tooth contact.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is brass compared to steel for this application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass has a tensile strength of approximately 300–500 MPa depending on alloy, compared to 400–800 MPa for common carbon steel. For light-duty applications — RC vehicles, robotics, small automation, and educational projects — brass provides adequate strength while offering superior machinability, lower noise, and natural corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does brass corrode, and do I need to lubricate these gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is naturally corrosion-resistant in most indoor and lightly humid environments and will not rust. For best performance, apply a light machine oil or white lithium grease to the tooth faces, especially in continuous-duty applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What gear ratio will I get pairing this 34T gear with a common motor pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio = driven teeth ÷ driver teeth. Pairing this 34T gear with a 17T motor pinion gives a 2:1 reduction. With a 10T pinion the ratio is 3.4:1; with an 8T pinion it is 4.25:1.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order a single piece to test fit before buying in bulk?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 1 PCS pack option is available for every bore size, allowing you to verify fit, mesh quality, and dimensional accuracy before committing to a 5 or 10-piece order.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Mod 34T 【Bore 4mm】 \/ 1 PCS","offer_id":52442807075090,"sku":"AdaahGFCD04408x1","price":9.13,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 34T 【Bore 5mm】 \/ 1 PCS","offer_id":52442807107858,"sku":"AdaahGFCD04409x1","price":9.13,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 34T 【Bore 6mm】 \/ 1 PCS","offer_id":52442807140626,"sku":"AdaahGFCD04410x1","price":9.13,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 34T 【Bore 6.35mm】 \/ 1 PCS","offer_id":52442807173394,"sku":"AdaahGFCD04411x1","price":9.13,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 34T 【Bore 7mm】 \/ 1 PCS","offer_id":52442807206162,"sku":"AdaahGFCD04412x1","price":9.13,"currency_code":"USD","in_stock":true},{"title":"0.5 Mod 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