{"product_id":"brass-helical-gear-module-1-5-45-left-hand-10-15-tooth-motor-pinion-8-15mm-bore","title":"Brass Helical Gear Module 1.5 45° Left-hand 10-15 Tooth Motor Pinion 8-15mm Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBrass Helical Gear Module 1.5 — Precision Left-Hand Drive for Motor Pinion Applications\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotics platform, or automation drive train demands smooth, low-noise power transmission, a poorly matched pinion gear becomes the weakest link. Engineers and makers who need reliable helical engagement — without the backlash and vibration of spur gears — rely on module 1.5 brass helical gears to keep motion systems running true.\u003c\/p\u003e\n\u003cp\u003eThese brass helical gears feature a 45° left-hand helix angle and are available in 10, 13, and 15 tooth counts. Bore sizes range from 8 mm (0.31 in) to 15 mm (0.59 in), with keyway options (4 mm or 5 mm) available on larger bores for positive shaft locking. Gear face width is typically 10–20 mm depending on tooth count, and overall diameter scales with module and tooth count per standard gear geometry.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include motor pinion drives on stepper and servo motors in CNC milling machines, helical rack-and-pinion linear actuators, and compact gearbox stages in robotics joints where quiet, efficient torque transfer is essential.\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 1.5 left-hand helical gears and racks. Verify helix direction (left-hand) and module before pairing. Keyway variants require a matching key on the shaft.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Brass Helical Gears Module 1.5\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\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\u003eEngineered for smooth, progressive tooth engagement that reduces noise and vibration compared to straight-cut spur gears — ideal for continuous-duty motor pinion applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\n\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e\n\u003cp\u003eBrass offers a favorable combination of machinability, moderate strength, and natural corrosion resistance — well-suited for indoor automation, light CNC, and instrument drives.\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: 10, 13, 15 Tooth\u003c\/strong\u003e\n\u003cp\u003eThree tooth count options let you dial in the gear ratio you need for your motor pinion stage without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range with Keyway Options\u003c\/strong\u003e\n\u003cp\u003eBore sizes from 8 mm to 15 mm accommodate common motor shaft diameters. Keyway variants (4 mm or 5 mm) provide positive torque transmission without relying solely on set screws.\u003c\/p\u003e\n\u003c\/div\u003e\n\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 SKU to match your project build quantity — useful for paired gear sets, spare parts stocking, or small-batch production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eModule 1.5 Standard Geometry\u003c\/strong\u003e\n\u003cp\u003eManufactured to Module 1.5 gear standards for predictable pitch diameter, tooth profile, and mesh compatibility with other M1.5 helical components in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Helical Gear Module 1.5\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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 Tooth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\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 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e4 mm (for 10–12 mm bore) \/ 5 mm (for 14–15 mm bore) \/ None (8–10 mm plain bore)\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\u003ePitch Diameter\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)\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\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eMotor pinion, CNC drive, robotics, automation\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\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 when paired with a mating gear or rack. A 10-tooth pinion gives a higher reduction ratio (faster speed reduction, more torque multiplication) than a 15-tooth pinion at the same module. Match your tooth count to the gear ratio your motor and load require. If you are unsure, calculate: ratio = driven teeth ÷ driving teeth.\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 that matches your shaft — for example, an 8 mm shaft needs the 8 mm bore variant. If your shaft has a keyway, choose a bore variant that includes a matching keyway (4 mm keyway for 10–12 mm bores, 5 mm keyway for 14–15 mm bores) to ensure positive torque transmission.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a left-hand helical gear with a right-hand helical gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. For two helical gears to mesh on parallel shafts, they must have opposite helix hands — one left-hand and one right-hand. These gears are left-hand, so they must be paired with a right-hand Module 1.5 helical gear or rack. Using two gears of the same hand on parallel shafts will not produce proper mesh.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is brass compared to steel for gear applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBrass has lower tensile strength than steel but offers better machinability, natural corrosion resistance, and quieter operation due to its damping properties. Brass gears are well-suited for light-to-medium duty applications such as instrument drives, light CNC, and robotics. For heavy-load or high-cycle industrial applications, steel or hardened steel gears are typically recommended.\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. Brass naturally resists oxidation and mild corrosion in typical indoor environments, making it suitable for automation equipment, laboratory instruments, and light machinery. It is not recommended for prolonged exposure to saltwater, strong acids, or highly humid outdoor environments without additional protective coating.\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 rectangular slot that accepts a matching key inserted between the shaft and gear, providing a positive mechanical lock that prevents rotational slipping under torque. Keyway variants are recommended for higher-torque or reversing-load applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I order multiple pieces of the same variant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each variant listing includes quantity options of 1, 2, 3, 4, or 5 pieces. Select the quantity that matches your build requirement — useful for paired gear sets, redundancy spares, or small production batches.\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\": \"The tooth count determines your gear ratio when paired with a mating gear or rack. A 10-tooth pinion gives a higher reduction ratio than a 15-tooth pinion at the same module. Match your tooth count to the gear ratio your motor and load require.\"\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 that matches your shaft. If your shaft has a keyway, choose a bore variant that includes a matching keyway to ensure positive torque transmission.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a left-hand helical gear with a right-hand helical gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For two helical gears to mesh on parallel shafts, they must have opposite helix hands. 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Brass naturally resists oxidation and mild corrosion in typical indoor environments, making it suitable for automation equipment, laboratory instruments, and light machinery.\"\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 rectangular slot that accepts a matching key, providing a positive mechanical lock that prevents rotational slipping under torque.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order multiple pieces of the same variant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each variant listing includes quantity options of 1, 2, 3, 4, or 5 pieces. Select the quantity that matches your build requirement.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1.5【10 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439931978002,"sku":"PENGJGJXCD4191x1","price":16.71,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【10 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439932010770,"sku":"PENGJGJXCD4192x1","price":16.58,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 10mm + 4mm Keyway \/ 1 pcs","offer_id":52439932043538,"sku":"PENGJGJXCD4193x1","price":22.56,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【13 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439932076306,"sku":"PENGJGJXCD4194x1","price":22.43,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439932109074,"sku":"PENGJGJXCD4195x1","price":24.96,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【15 Tooth】 \/ 14mm + 5mm Keyway \/ 1 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