{"product_id":"mod-0-5-brass-pinion-gear-spur-gears-20-60-teeth-4-12mm-bore-with-screw-hardened","title":"Mod 0.5 Brass Pinion Gear Spur Gears 20-60 Teeth 4-12mm Bore With Screw Hardened","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 0.5 Brass Pinion Spur Gears — Precision Motion for CNC, Robotics \u0026amp; DIY Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands tight tolerances and reliable torque transfer, undersized or poorly machined gears become the weakest link. Engineers, makers, and hobbyists working on CNC machines, robotic arms, and compact automation assemblies need a Mod 0.5 brass pinion spur gear that holds its bore dimension, meshes cleanly, and resists wear over thousands of cycles.\u003c\/p\u003e\n\u003cp\u003eThese Mod 0.5 brass pinion spur gears are machined from solid brass stock and hardened for extended service life. Each gear features a precisely reamed bore ranging from 4 mm to 12 mm (approximately 0.157 in to 0.472 in) and a radial set screw for secure shaft retention. Tooth counts span 20 to 60 teeth, giving an outer diameter range of approximately 11 mm to 31 mm (0.43 in to 1.22 in) at 0.5 module pitch.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small-format CNC router axis drives, servo-driven robotic finger joints, and compact gear-reduction stages in 3D printer extruder assemblies. The consistent 0.5 module tooth profile also makes these gears a reliable replacement for worn pinions in RC vehicle differentials and clock-mechanism prototypes.\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 Mod 0.5 (Module 0.5) gear systems. Meshes with any standard Mod 0.5 spur or rack gear. Verify shaft diameter against selected bore size before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 0.5 Brass Pinion 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 — Machined from brass for good machinability, moderate corrosion resistance, and low friction against steel shafts in light-load applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\u003cstrong\u003eWide Tooth Range: 20–60 Teeth\u003c\/strong\u003e — Covers a broad gear-ratio spectrum in a single product family, reducing the need to source from multiple suppliers for a single build.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Options: 4–12 mm\u003c\/strong\u003e — Bore sizes from 4 mm to 12 mm accommodate common motor and shaft diameters used in hobby CNC, robotics, and automation projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔐\u003c\/span\u003e\u003cstrong\u003eRadial Set Screw Included\u003c\/strong\u003e — Each gear ships with a set screw for positive shaft locking, preventing rotational slip under load without requiring adhesive or press-fit tooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eHardened for Extended Wear Life\u003c\/strong\u003e — The hardening process increases surface hardness, extending tooth life in continuous-duty or high-cycle applications compared to standard soft-brass gears.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eAvailable in 1 or 2 PCS Packs\u003c\/strong\u003e — Order a single gear for a replacement or a two-piece pack for paired-axis or mirrored-drive configurations, with quantity pricing built in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod 0.5 Brass Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass (hardened)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e20 \/ 22 \/ 24 \/ 25 \/ 28 \/ 30 \/ 32 \/ 35 \/ 40 \/ 50 \/ 60 Teeth\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 \/ 7 mm \/ 8 mm \/ 10 mm \/ 12 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~11 mm – ~31 mm (0.43 in – 1.22 in), varies by tooth count\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard Mod 0.5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Retention\u003c\/th\u003e\n\u003ctd\u003eRadial set screw (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur (straight tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass \/ hardened surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS or 2 PCS (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee 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 tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect tooth counts based on your desired gear ratio. Divide the driven gear's tooth count by the driving pinion's tooth count to get the ratio. For example, a 20-tooth pinion driving a 60-tooth gear gives a 3:1 reduction. Smaller pinions (20–25T) suit high-reduction stages; larger pinions (40–60T) work better in near-1:1 or speed-increasing configurations.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I order 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 before ordering. Available bores are 4, 5, 6, 7, 8, 10, and 12 mm. Choose the bore that matches your shaft exactly — the set screw compensates for minor fit variation but is not a substitute for a correctly sized bore.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for continuous-duty CNC use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese Mod 0.5 brass pinion spur gears are hardened to improve surface wear resistance and are suitable for light-to-moderate continuous-duty applications such as small CNC routers, 3D printer extruders, and robotic joints. For heavy-load or high-torque industrial drives, consider steel gears of the same module.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass offers moderate natural corrosion resistance and performs well in indoor environments with occasional humidity exposure. For outdoor or marine applications where prolonged moisture contact is expected, apply a light machine oil or consider stainless-steel alternatives for critical assemblies.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with Mod 0.5 racks and other Mod 0.5 gears from different brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 0.5 module (Mod 0.5) tooth profile is an internationally standardized metric gear standard. These pinions will mesh correctly with any Mod 0.5 spur gear, rack, or internal gear regardless of brand, provided the pressure angle is 20° (the most common standard). Always confirm the mating gear's module and pressure angle before assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 PCS or 2 PCS, and is there a price advantage?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder 1 PCS for a single-axis replacement or prototype build. Choose the 2 PCS pack when you need matched pairs for dual-axis drives, mirrored gearboxes, or to keep a spare on hand. The 2 PCS variants are priced lower per piece than buying two individual units, making them the better value for paired applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow is the set screw installed and what tool does it require?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe set screw is threaded into a radial hole in the gear hub. Use a hex (Allen) key of the appropriate size — typically 1.5 mm or 2 mm for Mod 0.5 gears. Slide the gear onto the shaft, align it to the desired position, then tighten the set screw firmly. Apply a small drop of thread-locking compound if vibration is a concern.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Teeth count and Bore \u0026amp; Amount 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 tooth count for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select tooth counts based on your desired gear ratio. Divide the driven gear's tooth count by the driving pinion's tooth count to get the ratio. For example, a 20-tooth pinion driving a 60-tooth gear gives a 3:1 reduction. Smaller pinions (20–25T) suit high-reduction stages; larger pinions (40–60T) work better in near-1:1 or speed-increasing configurations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I order for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper before ordering. Available bores are 4, 5, 6, 7, 8, 10, and 12 mm. Choose the bore that matches your shaft exactly — the set screw compensates for minor fit variation but is not a substitute for a correctly sized bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty CNC use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These Mod 0.5 brass pinion spur gears are hardened to improve surface wear resistance and are suitable for light-to-moderate continuous-duty applications such as small CNC routers, 3D printer extruders, and robotic joints. For heavy-load or high-torque industrial drives, consider steel gears of the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears resist corrosion in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass offers moderate natural corrosion resistance and performs well in indoor environments with occasional humidity exposure. For outdoor or marine applications where prolonged moisture contact is expected, apply a light machine oil or consider stainless-steel alternatives for critical assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with Mod 0.5 racks and other Mod 0.5 gears from different brands?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 0.5 module (Mod 0.5) tooth profile is an internationally standardized metric gear standard. These pinions will mesh correctly with any Mod 0.5 spur gear, rack, or internal gear regardless of brand, provided the pressure angle is 20°.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1 PCS or 2 PCS, and is there a price advantage?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order 1 PCS for a single-axis replacement or prototype build. Choose the 2 PCS pack when you need matched pairs for dual-axis drives, mirrored gearboxes, or to keep a spare on hand. The 2 PCS variants are priced lower per piece than buying two individual units.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How is the set screw installed and what tool does it require?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The set screw is threaded into a radial hole in the gear hub. Use a hex (Allen) key — typically 1.5 mm or 2 mm for Mod 0.5 gears. Slide the gear onto the shaft, align it, then tighten the set screw firmly. Apply thread-locking compound if vibration is a concern.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Modulus \/ 20 Teeth \/ 4 mm \u0026 1 PCS","offer_id":52442541719826,"sku":"GYJLTJGJXCD3649x1","price":4.19,"currency_code":"USD","in_stock":true},{"title":"0.5 Modulus \/ 20 Teeth \/ 5 mm \u0026 1 PCS","offer_id":52442541752594,"sku":"GYJLTJGJXCD3650x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"0.5 Modulus \/ 22 Teeth \/ 4 mm \u0026 1 PCS","offer_id":52442541785362,"sku":"GYJLTJGJXCD3651x1","price":4.5,"currency_code":"USD","in_stock":true},{"title":"0.5 Modulus \/ 22 Teeth \/ 5 mm \u0026 1 PCS","offer_id":52442541818130,"sku":"GYJLTJGJXCD3652x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"0.5 Modulus \/ 22 Teeth \/ 6 mm \u0026 1 PCS","offer_id":52442541850898,"sku":"GYJLTJGJXCD3653x1","price":4.43,"currency_code":"USD","in_stock":true},{"title":"0.5 Modulus \/ 24 Teeth \/ 4 mm \u0026 1 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