{"product_id":"module-1-helical-gear-stainless-steel-45-left-hand-13-15-20-tooth-motor-pinion","title":"Module 1 Helical Gear Stainless Steel 45° Left-hand 13\/15\/20 Tooth Motor Pinion","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 1 Helical Gear — Stainless Steel Left-Hand Motor Pinion for Precision Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a standard spur gear creates too much noise or axial load is a concern, engineers and makers turn to helical gears for smoother, quieter power transmission. This Module 1 helical gear is designed for hobbyists, robotics builders, CNC enthusiasts, and mechanical engineers who need a reliable left-hand 45° helix angle pinion for motor output shafts and compact drive trains.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from stainless steel, offering solid corrosion resistance and structural integrity for demanding environments. The module is 1 (metric), with tooth counts of 13, 15, or 20 teeth, and bore sizes ranging from 6 mm (0.24 in) to 16 mm (0.63 in). Keyway bore options (4 mm and 5 mm keyway) are available for positive shaft locking. Overall gear diameter typically ranges from approximately 15 mm (0.59 in) for the 13-tooth variant to approximately 22 mm (0.87 in) for the 20-tooth variant.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor pinion drives in robotics and automation rigs, compact gearbox assemblies in 3D printer extruder mechanisms, and light-duty CNC axis drives where helical engagement reduces backlash and vibration compared to straight-cut spur gears.\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 to mesh with Module 1 right-hand helical gears of matching helix angle (45°). Verify bore diameter and keyway dimensions against your shaft before ordering. Not interchangeable with spur gears or different module sizes.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Module 1 Helical Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from stainless steel for corrosion resistance and durability in humid or lightly wet environments, outperforming standard carbon steel gears in longevity.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003e45° Left-Hand Helix Angle\u003c\/strong\u003e\n\u003cp\u003eThe 45° helix angle delivers smooth, progressive tooth engagement that reduces noise and vibration — ideal for motor pinion applications where quiet operation matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eMultiple Tooth Counts: 13 \/ 15 \/ 20\u003c\/strong\u003e\n\u003cp\u003eThree tooth count options let you dial in the exact gear ratio needed for your drive system, from higher-speed 13-tooth pinions to torque-friendly 20-tooth configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Size Range with Keyway Options\u003c\/strong\u003e\n\u003cp\u003eBore sizes from 6 mm to 16 mm cover most motor shaft diameters. Keyway variants (4 mm and 5 mm) provide positive shaft engagement and prevent slippage under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eModule 1 Metric Standard\u003c\/strong\u003e\n\u003cp\u003eConforms to the Module 1 metric gear standard, ensuring straightforward meshing with any compatible Module 1 mating gear in your assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n\u003cstrong\u003ePrecision Machined for Consistent Fit\u003c\/strong\u003e\n\u003cp\u003eEach gear is machined to consistent tolerances, reducing runout and ensuring repeatable performance across multiple units in multi-gear drive trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Module 1 Helical Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (Metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHelix Angle\u003c\/th\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHand\u003c\/th\u003e\n\u003ctd\u003eLeft-Hand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e13 \/ 15 \/ 20 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm; Keyway: 10+4mm \/ 12+4mm \/ 14+5mm \/ 15+5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e13T ≈ 13 mm | 15T ≈ 15 mm | 20T ≈ 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e13T ≈ 15 mm | 15T ≈ 17 mm | 20T ≈ 22 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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eHelical Pinion Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eMotor pinion, robotics, CNC, automation drive systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 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 tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your gear ratio. A 13-tooth pinion paired with a larger driven gear gives a higher reduction ratio (more torque, less speed). A 20-tooth pinion provides a lower reduction ratio (more speed, less torque). Match your tooth count to the driven gear size to achieve your target RPM and torque output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter precisely with calipers. Select the bore size that matches your shaft — for example, a 6 mm shaft requires the 6 mm bore variant. If your shaft uses a key for positive locking, choose a keyway bore option (e.g., 10 mm + 4 mm keyway). A bore that is too large will cause slippage; too small will not fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs stainless steel strong enough for my drive application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers a good balance of strength and corrosion resistance for light-to-medium duty motor pinion applications, robotics, and automation. For very high-torque or heavy industrial applications, consider whether a hardened alloy steel gear would be more appropriate. These gears are well-suited for DC motor outputs, stepper motor drives, and similar precision motion applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear corrode or rust in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel provides solid corrosion resistance in humid and mildly wet conditions, making it suitable for outdoor robotics, marine-adjacent applications, and environments where carbon steel would rust. For prolonged immersion or highly corrosive chemical environments, additional protective measures may be needed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat mating gear does this left-hand helical gear pair with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis is a left-hand helix gear. It must be paired with a right-hand helix gear of the same module (Module 1) and the same helix angle (45°) for proper meshing on parallel shafts. Do not attempt to mesh it with spur gears, different module gears, or gears of a different helix angle — this will result in poor contact and rapid wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a 3D printer or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 1 helical gears are commonly used in 3D printer extruder drives and CNC axis gearboxes where smooth, low-noise transmission is important. Verify that your existing drive gear is also Module 1 with a matching 45° helix angle and opposite hand before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore and a keyway bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA plain bore relies on a set screw or press fit to secure the gear to the shaft. A keyway bore includes a machined slot that accepts a key (a small rectangular metal piece) inserted between the shaft and gear, providing a positive mechanical lock that prevents rotational slippage under load. Keyway options are recommended for higher-torque applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n\u003cp\u003e🛒 Select your tooth count, bore size, and quantity above, then add to cart.\u003c\/p\u003e\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 tooth count determines your gear ratio. A 13-tooth pinion paired with a larger driven gear gives a higher reduction ratio (more torque, less speed). A 20-tooth pinion provides a lower reduction ratio (more speed, less torque). Match your tooth count to the driven gear size to achieve your target RPM and torque output.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I select for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter precisely with calipers. Select the bore size that matches your shaft. If your shaft uses a key for positive locking, choose a keyway bore option. A bore that is too large will cause slippage; too small will not fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is stainless steel strong enough for my drive application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel offers a good balance of strength and corrosion resistance for light-to-medium duty motor pinion applications, robotics, and automation. These gears are well-suited for DC motor outputs, stepper motor drives, and similar precision motion applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode or rust in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel provides solid corrosion resistance in humid and mildly wet conditions, making it suitable for outdoor robotics, marine-adjacent applications, and environments where carbon steel would rust.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear does this left-hand helical gear pair with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This is a left-hand helix gear. It must be paired with a right-hand helix gear of the same module (Module 1) and the same helix angle (45°) for proper meshing on parallel shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 1 helical gears are commonly used in 3D printer extruder drives and CNC axis gearboxes. Verify that your existing drive gear is also Module 1 with a matching 45° helix angle and opposite hand before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a plain bore and a keyway bore?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A plain bore relies on a set screw or press fit to secure the gear to the shaft. A keyway bore includes a machined slot that accepts a key inserted between the shaft and gear, providing a positive mechanical lock that prevents rotational slippage under load.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1【13 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439883481362,"sku":"PENGJGJXCD4242x1","price":11.41,"currency_code":"USD","in_stock":true},{"title":"Module 1【13 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439883514130,"sku":"PENGJGJXCD4243x1","price":11.22,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439883546898,"sku":"PENGJGJXCD4244x1","price":12.44,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439883579666,"sku":"PENGJGJXCD4245x1","price":12.36,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439883612434,"sku":"PENGJGJXCD4246x1","price":12.23,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 12mm \/ 1 pcs","offer_id":52439883645202,"sku":"PENGJGJXCD4247x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439883677970,"sku":"PENGJGJXCD4248x1","price":15.57,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 12mm \/ 1 pcs","offer_id":52439883710738,"sku":"PENGJGJXCD4249x1","price":15.35,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 14mm \/ 1 pcs","offer_id":52439883743506,"sku":"PENGJGJXCD4250x1","price":15.22,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 15mm \/ 1 pcs","offer_id":52439883776274,"sku":"PENGJGJXCD4251x1","price":15.08,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 16mm \/ 1 pcs","offer_id":52439883809042,"sku":"PENGJGJXCD4252x1","price":14.95,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439883841810,"sku":"PENGJGJXCD4253x1","price":16.71,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439883874578,"sku":"PENGJGJXCD4254x1","price":16.58,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52439883907346,"sku":"PENGJGJXCD4255x1","price":16.31,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52439883940114,"sku":"PENGJGJXCD4256x1","price":16.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of9_c627fb11-ca53-4c02-9440-f1281cd05fb4.jpg?v=1783434003","url":"https:\/\/homediyer.com\/products\/module-1-helical-gear-stainless-steel-45-left-hand-13-15-20-tooth-motor-pinion","provider":"HomeDIYer","version":"1.0","type":"link"}