{"product_id":"module-2-helical-gear-45-left-hand-nylon-pinion-14-20mm-bore-blue","title":"Module 2 Helical Gear 45° Left-hand 13-15 Tooth Nylon Pinion 14-20mm Bore Blue","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 2 Left-Hand Helical Gear — Quiet Nylon Pinion for Precision Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your drive system demands smooth, low-noise power transmission and standard steel gears are simply too heavy or too loud, engineers and makers turn to nylon helical pinions. This Module 2 left-hand helical gear is designed for hobbyists, robotics builders, and automation integrators who need a reliable, lightweight meshing component that pairs correctly with right-hand helical racks or opposing-hand gear sets.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from engineering-grade nylon, finished in blue for easy identification in mixed-material assemblies. Available in 13-tooth and 15-tooth configurations, with a 45° helix angle and bore sizes ranging from 14 mm to 20 mm (approximately 0.55 in to 0.79 in), all bores include a matching keyway (5 mm or 6 mm depending on bore size) for positive shaft engagement without slippage.\u003c\/p\u003e\n\u003cp\u003eTypical applications include compact conveyor pinion drives requiring quiet operation, DIY CNC router Z-axis helical gear sets, and lightweight robotic arm joint drives where nylon helical gears reduce backlash noise compared to spur alternatives.\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 Module 2 right-hand helical racks and gears. Helix angle: 45°. Verify shaft diameter and keyway dimensions against your bore size selection before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Module 2 Nylon Helical Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\n\u003cstrong\u003e45° Left-Hand Helix Angle\u003c\/strong\u003e\n\u003cp\u003eEngineered for correct mesh with right-hand helical counterparts, enabling smooth, progressive tooth engagement that reduces vibration and noise versus straight spur gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧱\u003c\/span\u003e\n\u003cstrong\u003eEngineering-Grade Nylon Construction\u003c\/strong\u003e\n\u003cp\u003eNylon offers self-lubricating properties, corrosion resistance, and reduced weight — ideal for applications where metal gears would add unnecessary mass or require lubrication maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 2 Standard — 13 or 15 Tooth Options\u003c\/strong\u003e\n\u003cp\u003eTwo tooth count options let you tune your gear ratio precisely. Module 2 is a widely adopted metric standard, ensuring broad compatibility with off-the-shelf racks and mating gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eKeyed Bore — 14 mm to 20 mm\u003c\/strong\u003e\n\u003cp\u003eSeven bore sizes with integrated keyways (5 mm keyway for 14–18 mm bores; 6 mm keyway for 18–20 mm bores) provide positive, slip-free shaft coupling without additional machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\n\u003cstrong\u003eBlue Color-Coded for Easy Identification\u003c\/strong\u003e\n\u003cp\u003eThe distinctive blue finish makes it straightforward to identify left-hand helical components in assemblies containing both left- and right-hand gears, reducing assembly errors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eMulti-Pack Quantities Available\u003c\/strong\u003e\n\u003cp\u003eOrder 1 to 5 pieces per transaction to match your project scale — whether you need a single replacement pinion or a set for a multi-axis system.\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 — Module 2 Helical Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2\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 tooth \/ 15 tooth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade nylon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size Range\u003c\/th\u003e\n\u003ctd\u003e14 mm – 20 mm (0.55 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e5 mm (for 14–17 mm bore) \/ 6 mm (for 18–20 mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (13T)\u003c\/th\u003e\n\u003ctd\u003e26 mm (1.02 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (15T)\u003c\/th\u003e\n\u003ctd\u003e30 mm (1.18 in)\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°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 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 between the 13-tooth and 15-tooth options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your gear ratio when paired with a rack or mating gear. A 13-tooth pinion gives a higher reduction ratio (more torque, less speed) compared to a 15-tooth pinion. If you need faster linear travel on a rack-and-pinion system, choose 15T; for more torque in a compact package, choose 13T. Both are Module 2 and share the same 45° left-hand helix angle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size and keyway should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter precisely with calipers. Select the bore size that matches your shaft (e.g., 16 mm shaft → 16 mm + 5 mm keyway bore). The keyway width is 5 mm for bores from 14 mm to 17 mm, and 6 mm for bores from 18 mm to 20 mm. Ensure your shaft has a matching keyway cut to the same width for a secure fit.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs nylon strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering-grade nylon is well-suited for light-to-medium duty drives, robotics, automation, and DIY machinery where loads are moderate and quiet operation is a priority. Nylon gears are not recommended for high-torque, high-temperature, or heavy industrial applications where steel or brass gears would be more appropriate. If you are unsure, calculate the tangential force on the gear tooth and compare it against nylon's rated flexural strength for your operating temperature.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes nylon resist corrosion and moisture?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Nylon is inherently corrosion-resistant and performs well in environments where metal gears would rust or oxidize. However, nylon can absorb moisture over time, which may cause slight dimensional changes. For high-humidity or submerged environments, verify dimensional tolerances are acceptable for your application, or consider a moisture-stabilized nylon grade.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat mating gear or rack does this helical gear pair with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis is a left-hand helical gear. It meshes correctly with a Module 2 right-hand helical rack or a right-hand helical gear of the same module and helix angle (45°). Do not pair it with spur gears or racks — the helix angle must match for proper tooth contact. Confirm the hand (left vs. right) of your existing rack or mating gear before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to lubricate nylon helical gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOne of the advantages of nylon is its self-lubricating surface, which means many light-duty applications run dry without additional lubrication. For higher speeds or loads, a light application of PTFE-based dry lubricant or white lithium grease can extend service life. Avoid petroleum-based oils that may degrade nylon over time.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order multiple pieces for a multi-axis system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each variant listing allows you to select 1, 2, 3, 4, or 5 pieces per order. Choose the quantity that matches your project needs. All pieces in a multi-pack are identical in module, tooth count, bore size, and helix angle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth count, bore size, and 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 between the 13-tooth and 15-tooth options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines your gear ratio when paired with a rack or mating gear. A 13-tooth pinion gives a higher reduction ratio (more torque, less speed) compared to a 15-tooth pinion. If you need faster linear travel on a rack-and-pinion system, choose 15T; for more torque in a compact package, choose 13T.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size and keyway should I select for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter precisely with calipers. Select the bore size that matches your shaft. The keyway width is 5 mm for bores from 14 mm to 17 mm, and 6 mm for bores from 18 mm to 20 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is nylon strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering-grade nylon is well-suited for light-to-medium duty drives, robotics, automation, and DIY machinery where loads are moderate and quiet operation is a priority. It is not recommended for high-torque, high-temperature, or heavy industrial applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does nylon resist corrosion and moisture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Nylon is inherently corrosion-resistant and performs well in environments where metal gears would rust or oxidize. However, nylon can absorb moisture over time, which may cause slight dimensional changes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear or rack does this helical gear pair with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This left-hand helical gear meshes correctly with a Module 2 right-hand helical rack or a right-hand helical gear of the same module and 45° helix angle. Do not pair it with spur gears or racks.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate nylon helical gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon is self-lubricating, so many light-duty applications run dry. For higher speeds or loads, a light application of PTFE-based dry lubricant or white lithium grease can extend service life. Avoid petroleum-based oils.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order multiple pieces for a multi-axis system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each variant listing allows you to select 1, 2, 3, 4, or 5 pieces per order. All pieces in a multi-pack are identical in module, tooth count, bore size, and helix angle.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 2【13 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52439875649810,"sku":"PENGJGJXCD2643x1","price":17.92,"currency_code":"USD","in_stock":true},{"title":"Module 2【13 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52439875682578,"sku":"PENGJGJXCD2644x1","price":17.92,"currency_code":"USD","in_stock":true},{"title":"Module 2【13 Tooth】 \/ 16mm + 5mm Keyway \/ 1 pcs","offer_id":52439875715346,"sku":"PENGJGJXCD2645x1","price":17.92,"currency_code":"USD","in_stock":true},{"title":"Module 2【13 Tooth】 \/ 17mm + 5mm Keyway \/ 1 pcs","offer_id":52439875748114,"sku":"PENGJGJXCD2646x1","price":17.92,"currency_code":"USD","in_stock":true},{"title":"Module 2【13 Tooth】 \/ 18mm + 6mm Keyway \/ 1 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