{"product_id":"helical-gear-module-1-1-5-stainless-steel-45-left-hand-10-20-tooth-motor-pinion","title":"Helical Gear Module 1 1.5 Stainless Steel 45° Left-hand 10-20 Tooth Motor Pinion","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eLeft-Hand Helical Gear Module 1 \u0026amp; 1.5 — Stainless Steel Motor Pinion for Precision Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen backlash, noise, and axial load management matter in your motion system, a standard spur gear simply won't cut it. Engineers, CNC builders, and robotics integrators who demand smooth, quiet power transmission under continuous load rely on left-hand helical gears to deliver consistent performance across demanding duty cycles.\u003c\/p\u003e\n    \u003cp\u003eThese left-hand helical gears are machined from stainless steel with a 45° helix angle, available in Module 1 and Module 1.5 configurations. Tooth counts range from 10 to 20 teeth, with bore sizes spanning 6 mm (0.24 in) to 16 mm (0.63 in). Select variants include a precision-cut keyway (4 mm or 5 mm) for positive torque transmission without set-screw slip.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include CNC router motor pinion drives, robotic joint actuators requiring low-noise helical mesh, and paired left\/right helical gear sets for crossed-axis or parallel-shaft gearboxes. Long-tail use cases: stainless steel helical pinion gear for stepper motor, Module 1 left-hand gear for CNC Z-axis, 45-degree helix angle gear for quiet automation drive.\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 Pairs with right-hand helical gears of the same module (Module 1 or Module 1.5) and matching helix angle (45°). Confirm shaft diameter before ordering — bore sizes range from 6 mm to 16 mm with optional keyway.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Left-Hand Helical Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e — Corrosion-resistant stainless steel body withstands moisture, mild chemicals, and continuous mechanical stress without surface degradation.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e45° Left-Hand Helix Angle\u003c\/strong\u003e — Engineered 45° helix delivers gradual tooth engagement, reducing impact noise and distributing load across multiple teeth simultaneously for smoother torque transfer.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMultiple Module \u0026amp; Tooth Options\u003c\/strong\u003e — Available in Module 1 (13, 15, 20 tooth) and Module 1.5 (10, 13, 15 tooth) to match a wide range of gear ratio and pitch diameter requirements.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eWide Bore Size Range\u003c\/strong\u003e — Bore options from 6 mm to 16 mm accommodate common motor and shaft diameters; keyway variants (4 mm or 5 mm) provide positive rotational locking for high-torque applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eMotor Pinion Ready\u003c\/strong\u003e — Compact tooth counts (10–20 T) and precise bore tolerances make these gears ideal as direct motor pinions on stepper, servo, and DC gear motors.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003ePairs with Right-Hand Counterpart\u003c\/strong\u003e — Designed to mesh with matching right-hand helical gears of the same module for parallel-shaft or crossed-axis drive configurations in robotics and automation assemblies.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Left-Hand Helical Gears\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\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\u003eModule\u003c\/th\u003e\n\u003ctd\u003eModule 1 \/ Module 1.5 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e10 T \/ 13 T \/ 15 T \/ 20 T (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 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e4 mm keyway (10 mm, 12 mm bore) \/ 5 mm keyway (14 mm, 15 mm bore) \/ None (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter (Module 1)\u003c\/th\u003e\n\u003ctd\u003eTypically 13–20 mm depending on tooth count\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter (Module 1.5)\u003c\/th\u003e\n\u003ctd\u003eTypically 15–22.5 mm depending on tooth count\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (uncoated)\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        \u003ctr\u003e\n\u003cth\u003eWeight\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\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between Module 1 and Module 1.5?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule number defines the tooth size and pitch diameter. Module 1.5 gears have larger, stronger teeth and a bigger pitch diameter for the same tooth count compared to Module 1. Choose Module 1 for compact, lightweight drives; choose Module 1.5 when you need higher torque capacity or are matching an existing Module 1.5 mating gear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a keyway bore, or will a plain bore work?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA plain bore secured with a set screw is sufficient for light-to-moderate torque applications. If your motor or shaft transmits high torque or experiences reversing loads, a keyway bore provides a positive mechanical lock that prevents rotational slip. Select the keyway variant that matches your shaft's existing key dimensions (4 mm or 5 mm).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs stainless steel strong enough for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers a good balance of tensile strength, corrosion resistance, and machinability. It is well-suited for light-to-medium duty automation, robotics, and CNC applications. For very high-load industrial gearboxes, consider whether a hardened alloy steel gear would be more appropriate for your torque and fatigue requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears corrode in humid or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — stainless steel provides inherent corrosion resistance suitable for humid environments, light splash exposure, and mild chemical contact. It is not recommended for continuous immersion in aggressive acids or chloride-heavy solutions without additional protective measures.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat right-hand gear do I pair with this left-hand helical gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYou need a right-hand helical gear with the same module (1 or 1.5) and the same 45° helix angle. The tooth counts of the two mating gears determine your gear ratio — they do not need to be identical. Ensure the center distance matches the sum of the two pitch radii for proper mesh.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear directly on a stepper or servo motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The compact tooth counts (10–20 T) and available bore sizes (6–16 mm) cover the most common NEMA 17, NEMA 23, and small servo motor shaft diameters. Verify your motor shaft diameter and select the matching bore size. For shafts with a flat or key, choose the corresponding keyway variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I confirm the correct bore size before ordering?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. The bore size must match or be within the tolerance of your shaft diameter. If your shaft has a key slot, measure the key width (typically 4 mm or 5 mm for shafts in this diameter range) and select the matching keyway bore option.\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 between Module 1 and Module 1.5?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module number defines the tooth size and pitch diameter. Module 1.5 gears have larger, stronger teeth and a bigger pitch diameter for the same tooth count compared to Module 1. Choose Module 1 for compact, lightweight drives; choose Module 1.5 when you need higher torque capacity or are matching an existing Module 1.5 mating gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a keyway bore, or will a plain bore work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A plain bore secured with a set screw is sufficient for light-to-moderate torque applications. If your motor or shaft transmits high torque or experiences reversing loads, a keyway bore provides a positive mechanical lock that prevents rotational slip. Select the keyway variant that matches your shaft's existing key dimensions (4 mm or 5 mm).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is stainless steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel offers a good balance of tensile strength, corrosion resistance, and machinability. It is well-suited for light-to-medium duty automation, robotics, and CNC applications. For very high-load industrial gearboxes, consider whether a hardened alloy steel gear would be more appropriate for your torque and fatigue requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode in humid or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel provides inherent corrosion resistance suitable for humid environments, light splash exposure, and mild chemical contact. It is not recommended for continuous immersion in aggressive acids or chloride-heavy solutions without additional protective measures.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What right-hand gear do I pair with this left-hand helical gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"You need a right-hand helical gear with the same module (1 or 1.5) and the same 45° helix angle. The tooth counts of the two mating gears determine your gear ratio — they do not need to be identical. Ensure the center distance matches the sum of the two pitch radii for proper mesh.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear directly on a stepper or servo motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The compact tooth counts (10–20 T) and available bore sizes (6–16 mm) cover the most common NEMA 17, NEMA 23, and small servo motor shaft diameters. Verify your motor shaft diameter and select the matching bore size. For shafts with a flat or key, choose the corresponding keyway variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the correct bore size before ordering?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper. The bore size must match or be within the tolerance of your shaft diameter. If your shaft has a key slot, measure the key width (typically 4 mm or 5 mm for shafts in this diameter range) and select the matching keyway bore option.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1【13 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439934599442,"sku":"PENGJGJXCD4242x1","price":20.39,"currency_code":"USD","in_stock":true},{"title":"Module 1【13 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439934632210,"sku":"PENGJGJXCD4243x1","price":20.06,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439934664978,"sku":"PENGJGJXCD4244x1","price":22.29,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439934697746,"sku":"PENGJGJXCD4245x1","price":22.15,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439934730514,"sku":"PENGJGJXCD4246x1","price":22.02,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 12mm \/ 1 pcs","offer_id":52439934763282,"sku":"PENGJGJXCD4247x1","price":21.75,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439934796050,"sku":"PENGJGJXCD4248x1","price":28.08,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 12mm \/ 1 pcs","offer_id":52439934828818,"sku":"PENGJGJXCD4249x1","price":27.73,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 14mm \/ 1 pcs","offer_id":52439934861586,"sku":"PENGJGJXCD4250x1","price":27.4,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 15mm \/ 1 pcs","offer_id":52439934894354,"sku":"PENGJGJXCD4251x1","price":27.19,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 16mm \/ 1 pcs","offer_id":52439934927122,"sku":"PENGJGJXCD4252x1","price":27.0,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439934959890,"sku":"PENGJGJXCD4253x1","price":30.18,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439934992658,"sku":"PENGJGJXCD4254x1","price":29.91,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52439935025426,"sku":"PENGJGJXCD4255x1","price":29.5,"currency_code":"USD","in_stock":true},{"title":"Module 1【20 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52439935058194,"sku":"PENGJGJXCD4256x1","price":29.36,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【10 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439935090962,"sku":"PENGJGJXCD4257x1","price":29.04,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【10 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439935123730,"sku":"PENGJGJXCD4258x1","price":28.76,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439935156498,"sku":"PENGJGJXCD4259x1","price":37.11,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439935189266,"sku":"PENGJGJXCD4260x1","price":36.79,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439935222034,"sku":"PENGJGJXCD4261x1","price":43.64,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439935254802,"sku":"PENGJGJXCD4262x1","price":43.32,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52439935287570,"sku":"PENGJGJXCD4263x1","price":42.96,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52439935320338,"sku":"PENGJGJXCD4264x1","price":42.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of12_3a9b6e1c-5ef8-4922-9eb2-f14971da382f.jpg?v=1783525311","url":"https:\/\/homediyer.com\/products\/helical-gear-module-1-1-5-stainless-steel-45-left-hand-10-20-tooth-motor-pinion","provider":"HomeDIYer","version":"1.0","type":"link"}