{"product_id":"module-1-5-helical-gear-45-left-hand-10-20-tooth-pinion-bore-8-18mm-nylon-blue","title":"Module 1.5 Helical Gear 45° Left-hand 10-20 Tooth Pinion Bore 8-18mm Nylon Blue","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 1.5 Left-Hand Helical Gear — Quiet, Precise Power Transmission in Blue Nylon\u003c\/h2\u003e\n    \u003cp\u003eEngineers and makers building compact drive trains often struggle to find helical pinion gears that combine low noise, corrosion resistance, and accurate tooth geometry in a single off-the-shelf part. These Module 1.5 left-hand helical gears are designed for DIY CNC builders, robotics integrators, and automation hobbyists who need a reliable, drop-in pinion without custom machining.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from engineering-grade blue nylon, offering a lightweight yet durable alternative to metal pinions in moderate-load applications. The module 1.5 pitch covers tooth counts of 10, 13, 15, and 20, with bore diameters ranging from 8 mm (0.31 in) to 18 mm (0.71 in). Keyway options (4 mm and 5–6 mm depending on bore) are available on larger bores for positive shaft engagement. The 45° left-hand helix angle pairs with right-hand helical racks or mating gears to deliver smooth, low-vibration motion.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: helical rack-and-pinion linear actuators for CNC router Z-axes, quiet gear reduction stages in 3D printer extruder drives, and compact rotary indexing mechanisms in tabletop automation rigs where metal gear noise is unacceptable.\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 Module 1.5 helical gear systems with a 45° left-hand helix angle. Pairs with Module 1.5 right-hand helical racks and mating gears. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 1.5 Left-Hand Helical Pinion Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\n        \u003cstrong\u003eEngineering-Grade Blue Nylon Construction\u003c\/strong\u003e\n        \u003cp\u003eManufactured from reinforced nylon for a favorable strength-to-weight ratio, inherent corrosion resistance, and self-lubricating properties that reduce maintenance intervals in dry-running applications.\u003c\/p\u003e\n      \u003c\/div\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\u003eThe precise 45° helix delivers gradual tooth engagement, distributing load across multiple teeth simultaneously for quieter operation and reduced peak stress compared to spur gears of the same module.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore \u0026amp; Keyway Options\u003c\/strong\u003e\n        \u003cp\u003eAvailable in bore sizes from 8 mm to 18 mm. Larger bores include machined keyways (4 mm, 5 mm, or 6 mm) for positive torque transmission without relying solely on set screws.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n        \u003cstrong\u003eFour Tooth Count Selections\u003c\/strong\u003e\n        \u003cp\u003eChoose from 10, 13, 15, or 20 teeth to dial in your gear ratio. Smaller tooth counts suit high-speed, low-torque pinion stages; larger counts provide smoother engagement at moderate speeds.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities (1–5 pcs)\u003c\/strong\u003e\n        \u003cp\u003eOrder a single gear for prototyping or up to 5 pieces for production builds and spares inventory — all cut from the same tooling for consistent tooth geometry across the batch.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\n        \u003cstrong\u003eLow-Noise, Low-Vibration Drive\u003c\/strong\u003e\n        \u003cp\u003eThe helical tooth form and nylon material combine to dampen transmission noise and vibration, making these gears well-suited for enclosed enclosures, lab equipment, and noise-sensitive environments.\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 1.5 Helical Pinion Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5\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\u003e10 \/ 13 \/ 15 \/ 20 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm \/ 17 mm \/ 18 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e4 mm (10–12 mm bore) \/ 5 mm (14–17 mm bore) \/ 6 mm (18 mm bore) \/ None (8–10 mm plain bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering Nylon (PA)\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\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\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\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\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\u003eTooth count determines your gear ratio when paired with a rack or mating gear. A 10-tooth pinion gives a higher speed ratio (more rotations per linear unit on a rack), while a 20-tooth pinion provides smoother engagement and lower contact stress. For CNC router axes, 15–20 teeth are common; for compact extruder drives, 10–13 teeth are typical. Calculate your required ratio first, then select the tooth count that fits your bore and shaft size.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size and keyway should I select?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore diameter to your motor or drive shaft OD. If your shaft has a keyway, select the corresponding bore + keyway variant (e.g., 12 mm + 4 mm Keyway for a 12 mm keyed shaft). Plain bore variants (8 mm and 10 mm) rely on a set screw for retention and suit shafts without keyways. Always measure your shaft with calipers before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are nylon helical gears compared to metal gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering nylon (PA) gears handle moderate torque loads well and are preferred where noise reduction, weight savings, or corrosion resistance outweigh the need for maximum torque capacity. They are not recommended for high-torque, high-temperature, or continuous heavy-duty industrial applications where steel or aluminum gears are more appropriate. For typical CNC, robotics, and light automation loads, nylon gears perform reliably.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Nylon is inherently resistant to moisture, mild chemicals, and oxidation, making these gears suitable for humid environments, food-adjacent equipment (non-food-contact), and outdoor enclosures where metal gears would corrode. No additional coating or lubrication is required for standard operation, though a light dry lubricant can extend tooth life under continuous cycling.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat mating gear or rack do these pair with?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese are left-hand 45° helical gears. They mate with Module 1.5 right-hand helical racks (for linear motion) or Module 1.5 right-hand helical gears (for rotary reduction). Do not pair with spur gears or racks — the helix angle must match (opposite hand) for correct meshing. Confirm the module, helix angle, and pressure angle of your mating component before purchase.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I order multiple pieces for a production build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Select the Amount variant (1–5 pcs) to order the quantity you need in a single transaction. All pieces in a multi-pack are cut from the same tooling run, ensuring consistent tooth geometry and bore concentricity across the batch — important for paired-axis CNC machines or multi-stage gear trains.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need lubrication for these nylon gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNylon is self-lubricating under most light-to-moderate load conditions, so no lubrication is required for standard use. For high-cycle or continuous-duty applications, a PTFE-based dry lubricant applied to the tooth faces can reduce wear and extend service life. Avoid oil-based lubricants that may swell or degrade the nylon over time.\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 Models, Bore Size, and 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\": \"Tooth count determines your gear ratio when paired with a rack or mating gear. A 10-tooth pinion gives a higher speed ratio, while a 20-tooth pinion provides smoother engagement and lower contact stress. For CNC router axes, 15–20 teeth are common; for compact extruder drives, 10–13 teeth are typical.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size and keyway should I select?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore diameter to your motor or drive shaft OD. If your shaft has a keyway, select the corresponding bore + keyway variant. Plain bore variants (8 mm and 10 mm) rely on a set screw for retention. Always measure your shaft with calipers before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are nylon helical gears compared to metal gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering nylon gears handle moderate torque loads well and are preferred where noise reduction, weight savings, or corrosion resistance outweigh the need for maximum torque capacity. They are not recommended for high-torque or heavy-duty industrial applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Nylon is inherently resistant to moisture, mild chemicals, and oxidation, making these gears suitable for humid environments and outdoor enclosures. No additional coating or lubrication is required for standard operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear or rack do these pair with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These left-hand 45° helical gears mate with Module 1.5 right-hand helical racks (for linear motion) or Module 1.5 right-hand helical gears (for rotary reduction). Do not pair with spur gears — the helix angle must match (opposite hand) for correct meshing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order multiple pieces for a production build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Select the Amount variant (1–5 pcs) to order the quantity you need. All pieces in a multi-pack are cut from the same tooling run, ensuring consistent tooth geometry and bore concentricity across the batch.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need lubrication for these nylon gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon is self-lubricating under most light-to-moderate load conditions. For high-cycle applications, a PTFE-based dry lubricant applied to the tooth faces can reduce wear. Avoid oil-based lubricants that may swell or degrade the nylon over time.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1.5【10 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439941087506,"sku":"PENGJGJXCD2632x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【10 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439941120274,"sku":"PENGJGJXCD2633x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439941153042,"sku":"PENGJGJXCD2634x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439941185810,"sku":"PENGJGJXCD2635x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439941218578,"sku":"PENGJGJXCD2636x1","price":12.63,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 14mm + 5mm 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