{"product_id":"mod-0-5-brass-pinion-gear-spur-gears-20-60-teeth-4-15mm-bore-with-screw-hardened","title":"Mod 0.5 Brass Pinion Gear Spur Gears 20-60 Teeth 4-15mm 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 Gear — Precision Motion Control for CNC \u0026amp; Robotics\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear derails your build mid-project, the frustration is real. Makers, robotics hobbyists, and small-machine builders who need reliable, repeatable motion transfer demand a gear that holds its bore tight and meshes cleanly under load. These Mod 0.5 brass pinion spur gears are engineered for exactly that — delivering consistent torque transmission in compact drive trains where accuracy matters.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from brass with a hardened tooth profile, available in 20 to 60 teeth and bore diameters from 4 mm to 15 mm (approximately 0.16 in to 0.59 in). A captive set screw locks the gear firmly to the shaft, eliminating axial slip. The module (Mod) rating of 0.5 defines the tooth pitch, making these gears directly interchangeable with any other Mod 0.5 spur gear in your drivetrain.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC pen plotters and engravers requiring fine-pitch gear reduction, small robotic arm joints where a compact Mod 0.5 pinion gear meshes with a rack or larger spur, and DIY automation projects such as conveyor indexers, camera sliders, and clock mechanisms that rely on a hardened brass spur gear for long service life.\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 Mod 0.5 spur gear, rack, or pinion. Bore options from 4 mm to 15 mm fit standard motor shafts including NEMA 17 (5 mm), NEMA 23 (6.35 mm), and common hobby motor shafts (4–8 mm). Confirm your shaft diameter before selecting a bore variant.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Mod 0.5 Brass Pinion Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eSet Screw Bore Lock\u003c\/strong\u003e\n\u003cp\u003eEach gear includes a captive M2 or M3 set screw (size varies by bore) that clamps directly onto the shaft, preventing rotational and axial slip under dynamic loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth Count Range — 20 to 60 Teeth\u003c\/strong\u003e\n\u003cp\u003eChoose from 20 T up to 60 T to dial in your gear ratio. Finer ratios for speed, larger tooth counts for torque — all in the same Mod 0.5 pitch family.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eHardened Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe tooth flanks are hardened for wear resistance, extending service life in continuous-duty applications such as CNC routers, 3D printer extruder drives, and robotic joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eBrass Construction\u003c\/strong\u003e\n\u003cp\u003eBrass offers a favorable combination of machinability, moderate corrosion resistance, and low friction against steel mating gears — ideal for indoor automation and light-industrial use.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003ePrecision Mod 0.5 Pitch\u003c\/strong\u003e\n\u003cp\u003eModule 0.5 is a globally standardized tooth pitch. These gears mesh directly with any Mod 0.5 rack, pinion, or spur gear, simplifying drivetrain design and part sourcing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eMultiple Bore Options — 4 mm to 15 mm\u003c\/strong\u003e\n\u003cp\u003eBore sizes span 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, and 15 mm, covering the most common hobby and light-industrial motor shaft diameters.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Mod 0.5 Brass Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass (hardened tooth profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e20 – 60 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4 mm – 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eRound bore with set screw; stepped bore available on select variants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eMod × Teeth (e.g., 0.5 × 20 = 10 mm; 0.5 × 60 = 30 mm)\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\u003eFastener Included\u003c\/th\u003e\n\u003ctd\u003eSet screw (M2 or M3, varies by bore size)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS (per variant listing)\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 tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 20-tooth pinion with a 40-tooth spur gives a 2:1 reduction — halving speed and doubling torque. Choose a lower tooth count for higher speed output and a higher tooth count when you need more torque or a larger pitch diameter to match a specific center distance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for a NEMA 17 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNEMA 17 stepper motors typically have a 5 mm output shaft. Select the \u003cstrong\u003e5 mm bore\u003c\/strong\u003e variant. If your motor has a D-flat shaft, the set screw will seat against the flat for a more secure grip. For NEMA 23 motors (6.35 mm \/ 1\/4 in shaft), choose the \u003cstrong\u003e6.35 mm bore\u003c\/strong\u003e variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between \"No step\" and standard bore variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"No step\" bore variants have a straight-through cylindrical bore with no shoulder or counterbore — the shaft passes fully through the hub. Standard bore variants may include a stepped counterbore that positions the gear at a fixed axial depth on the shaft. Choose \"No step\" when you need to adjust the gear's axial position freely; choose the stepped variant when a fixed seating depth is required for your assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for continuous-duty CNC or robotics use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass Mod 0.5 spur gears are well-suited for light-to-medium duty continuous operation in CNC pen plotters, camera sliders, small robotic joints, and similar applications. The hardened tooth profile improves wear resistance compared to standard brass. For high-torque or high-speed industrial drives, consider a steel Mod 0.5 gear instead. If you are unsure whether brass meets your load requirements, contact us to confirm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears corrode or rust in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass is inherently corrosion-resistant and will not rust. In humid or mildly corrosive indoor environments, brass performs reliably without surface treatment. For outdoor or high-humidity applications, a light coating of machine oil or grease on the tooth flanks will further extend service life and reduce friction against mating steel gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I mesh this gear with a steel Mod 0.5 rack or spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any Mod 0.5 gear — regardless of material — will mesh correctly with these brass pinion gears, provided the pressure angle is 20° (the industry standard for Mod 0.5). Brass-on-steel pairings are common in precision instruments and light automation because the softer brass acts as a sacrificial wear surface, protecting the harder steel rack or spur from accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the center distance between two meshing Mod 0.5 gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) ÷ 2. For Mod 0.5 gears, Pitch Diameter = Module × Tooth Count. Example: a 20-tooth pinion (PD = 10 mm) meshing with a 40-tooth spur (PD = 20 mm) requires a center distance of (10 + 20) ÷ 2 = \u003cstrong\u003e15 mm\u003c\/strong\u003e.\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 \u003cstrong\u003eTeeth count and Bore diameter\u003c\/strong\u003e 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\": \"The gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 20-tooth pinion with a 40-tooth spur gives a 2:1 reduction — halving speed and doubling torque. Choose a lower tooth count for higher speed output and a higher tooth count when you need more torque or a larger pitch diameter to match a specific center distance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for a NEMA 17 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NEMA 17 stepper motors typically have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-flat shaft, the set screw will seat against the flat for a more secure grip. For NEMA 23 motors (6.35 mm \/ 1\/4 in shaft), choose the 6.35 mm bore variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between 'No step' and standard bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"'No step' bore variants have a straight-through cylindrical bore with no shoulder or counterbore — the shaft passes fully through the hub. Standard bore variants may include a stepped counterbore that positions the gear at a fixed axial depth on the shaft. Choose 'No step' when you need to adjust the gear's axial position freely; choose the stepped variant when a fixed seating depth is required for your assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty CNC or robotics use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass Mod 0.5 spur gears are well-suited for light-to-medium duty continuous operation in CNC pen plotters, camera sliders, small robotic joints, and similar applications. The hardened tooth profile improves wear resistance compared to standard brass. For high-torque or high-speed industrial drives, consider a steel Mod 0.5 gear instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode or rust in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Brass is inherently corrosion-resistant and will not rust. In humid or mildly corrosive indoor environments, brass performs reliably without surface treatment. For outdoor or high-humidity applications, a light coating of machine oil or grease on the tooth flanks will further extend service life and reduce friction against mating steel gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I mesh this gear with a steel Mod 0.5 rack or spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any Mod 0.5 gear — regardless of material — will mesh correctly with these brass pinion gears, provided the pressure angle is 20°. Brass-on-steel pairings are common in precision instruments and light automation because the softer brass acts as a sacrificial wear surface, protecting the harder steel rack or spur from accelerated wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the center distance between two meshing Mod 0.5 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (Pitch Diameter of Gear 1 + Pitch Diameter of Gear 2) ÷ 2. For Mod 0.5 gears, Pitch Diameter = Module × Tooth Count. Example: a 20-tooth pinion (PD = 10 mm) meshing with a 40-tooth spur (PD = 20 mm) requires a center distance of (10 + 20) ÷ 2 = 15 mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5 Models \/ 20 Teeth \/ 4 mm \u0026 1 PCS","offer_id":52442544832786,"sku":"GYJLTGFCD04365x1","price":1.48,"currency_code":"USD","in_stock":true},{"title":"0.5 Models \/ 20 Teeth \/ 5 mm \u0026 1 PCS","offer_id":52442544865554,"sku":"GYJLTGFCD04366x1","price":2.8,"currency_code":"USD","in_stock":true},{"title":"0.5 Models \/ 20 Teeth \/ 6 mm No step \u0026 1 PCS","offer_id":52442544898322,"sku":"GYJLTGFCD04367x1","price":2.88,"currency_code":"USD","in_stock":true},{"title":"0.5 Models \/ 22 Teeth \/ 4 mm \u0026 1 PCS","offer_id":52442544931090,"sku":"GYJLTGFCD04368x1","price":3.01,"currency_code":"USD","in_stock":true},{"title":"0.5 Models \/ 22 Teeth \/ 5 mm \u0026 1 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