{"product_id":"module-1-1-5-2-helical-gear-c45-steel-left-handed-45-13-30-tooth-motor-pinion","title":"Module 1 1.5 2 Helical Gear C45 Steel Left-handed 45° 13 - 30 Tooth Motor Pinion","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eLeft-handed Helical Gear — C45 Steel Motor Pinion for Precision Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotic arm, or automated conveyor demands smooth, low-noise power transmission, a mismatched or worn pinion gear becomes the weakest link in the entire drivetrain. These left-handed 45° helical gears are engineered for makers, machine builders, and automation engineers who need reliable, drop-in motion-control components without the lead time of custom machining.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from C45 medium-carbon steel, offering a solid balance of strength, machinability, and wear resistance. Available in Module 1, Module 1.5, and Module 2 standards, with tooth counts ranging from 13 to 30 teeth. Bore diameters span 6 mm (0.24 in) to 30 mm (1.18 in), with keyway options (4 mm, 5 mm, 6 mm, or 8 mm keyway) available on larger bore sizes to ensure positive shaft engagement.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include motor pinion drives on stepper and servo motors in CNC milling machines, left-handed helical gear pairs in gearbox assemblies requiring axial thrust cancellation, and precision rack-and-pinion linear motion systems in 3D printers, laser cutters, and pick-and-place automation equipment.\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 matching left-handed helical gears of the same module (Mod 1, Mod 1.5, or Mod 2) and 45° helix angle. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Left-handed Helical Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eC45 Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from C45 medium-carbon steel for dependable tensile strength and surface hardness, suitable for continuous-duty motion-control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e45° Left-handed Helix Angle\u003c\/strong\u003e\n\u003cp\u003eThe 45° left-handed helix delivers gradual tooth engagement, reducing impact noise and vibration compared to straight-cut spur gears — ideal for high-speed motor pinion applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔢\u003c\/div\u003e\n\u003cstrong\u003eThree Module Standards\u003c\/strong\u003e\n\u003cp\u003eAvailable in Module 1, Module 1.5, and Module 2, covering a wide range of torque and speed requirements from compact stepper motor pinions to mid-torque servo drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eWide Bore \u0026amp; Keyway Selection\u003c\/strong\u003e\n\u003cp\u003eBore sizes from 6 mm to 30 mm, with keyway slots (4–8 mm) on larger bores for positive, slip-free shaft coupling in demanding drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003e13 to 30 Tooth Range\u003c\/strong\u003e\n\u003cp\u003eSelect from 13T, 15T, 20T, 26T, or 30T configurations to dial in your gear ratio for the exact speed-torque balance your machine requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eDrop-in Replacement Ready\u003c\/strong\u003e\n\u003cp\u003eStandard module sizing ensures direct interchangeability with other Mod 1 \/ 1.5 \/ 2 helical gear systems — no custom machining required for most retrofit and repair scenarios.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Helical Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eC45 Medium-carbon 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-handed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003eModule 1 \/ Module 1.5 \/ Module 2 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e13T \/ 15T \/ 20T \/ 26T \/ 30T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 30 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 8 mm (bore-dependent; see 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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\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 module for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module determines the tooth size and pitch. Module 1 is the smallest and suits compact, high-speed motor pinion drives (e.g., small CNC or 3D printer axes). Module 1.5 balances size and torque for mid-range servo applications. Module 2 is suited for higher-torque, lower-speed drives. Always match the module of the pinion to the mating gear — mixing modules will result in incorrect meshing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between left-handed and right-handed helical gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe hand of a helical gear refers to the direction the teeth spiral around the gear body. Left-handed and right-handed gears must be paired together on parallel shafts to mesh correctly. These gears are left-handed (LH); ensure your mating gear is also left-handed if used on a parallel shaft, or right-handed if used in a crossed-axis configuration.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway bore, and which keyway size should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA keyway bore is recommended whenever you need positive, slip-free torque transmission — especially under reversing loads or high-torque conditions. The keyway size is matched to the bore diameter following standard DIN 6885 guidelines: 4 mm keyway for 10–12 mm bores, 5 mm keyway for 14–17 mm bores, 6 mm keyway for 18–22 mm bores, and 8 mm keyway for 24–30 mm bores. Plain (no keyway) bores are available for Module 1 variants in 6–16 mm sizes.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are C45 steel helical gears under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition, making it well-suited for moderate-to-high load gear applications. For very high-cycle fatigue or heavy shock loads, consider whether a heat-treated or alloy steel gear would better suit your duty cycle. Contact us if you need material certification details.\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\u003eC45 steel is not inherently corrosion resistant. For indoor, dry environments these gears perform reliably with standard lubrication. If your application involves moisture, coolant exposure, or outdoor conditions, we recommend applying a suitable gear lubricant or grease, or considering a stainless steel alternative. Contact us to confirm finish options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as a direct replacement for an existing helical gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the replacement gear matches the original in module, tooth count, helix angle (45°), hand (left-handed), and bore diameter. Measure your existing gear's outer diameter and tooth count, then use the formula: OD = (Z + 2) × m (where Z = tooth count, m = module) to verify the module before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication is recommended for these helical gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor most CNC and automation applications, an ISO VG 220 gear oil or a lithium-based grease (NLGI Grade 2) applied to the tooth flanks is suitable. Helical gears generate axial thrust loads, so ensure your bearing arrangement can accommodate thrust in addition to radial loads. Re-lubricate at regular maintenance intervals based on your operating speed and load.\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 Module, Tooth Count, and Bore Size 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 module for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module determines the tooth size and pitch. Module 1 is the smallest and suits compact, high-speed motor pinion drives. Module 1.5 balances size and torque for mid-range servo applications. Module 2 is suited for higher-torque, lower-speed drives. Always match the module of the pinion to the mating gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between left-handed and right-handed helical gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Left-handed and right-handed gears must be paired together on parallel shafts to mesh correctly. These gears are left-handed (LH); ensure your mating gear is also left-handed if used on a parallel shaft, or right-handed if used in a crossed-axis configuration.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a keyway bore, and which keyway size should I select?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A keyway bore is recommended for positive, slip-free torque transmission under reversing loads or high-torque conditions. Keyway size follows DIN 6885: 4mm for 10-12mm bores, 5mm for 14-17mm bores, 6mm for 18-22mm bores, 8mm for 24-30mm bores.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are C45 steel helical gears under continuous load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel has a typical tensile strength of approximately 600-800 MPa in the normalized condition, making it well-suited for moderate-to-high load gear applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel is not inherently corrosion resistant. For indoor, dry environments these gears perform reliably with standard lubrication. Apply a suitable gear lubricant or grease for moisture or coolant exposure environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these as a direct replacement for an existing helical gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the replacement gear matches the original in module, tooth count, helix angle (45°), hand (left-handed), and bore diameter. Use the formula OD = (Z + 2) x m to verify the module before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication is recommended for these helical gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"An ISO VG 220 gear oil or lithium-based grease (NLGI Grade 2) applied to the tooth flanks is suitable for most CNC and automation applications. Helical gears generate axial thrust loads, so ensure your bearing arrangement can accommodate thrust loads.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 1【13 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439945937170,"sku":"PENGJGJXCD1065x1","price":4.83,"currency_code":"USD","in_stock":true},{"title":"Module 1【13 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439945969938,"sku":"PENGJGJXCD1066x1","price":4.83,"currency_code":"USD","in_stock":true},{"title":"Module 1【13 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439946002706,"sku":"PENGJGJXCD1067x1","price":4.83,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 6mm \/ 1 pcs","offer_id":52439946035474,"sku":"PENGJGJXCD1068x1","price":5.37,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439946068242,"sku":"PENGJGJXCD1069x1","price":5.15,"currency_code":"USD","in_stock":true},{"title":"Module 1【15 Tooth】 \/ 10mm \/ 1 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