{"product_id":"1-2-3-mod-helical-gear-45-spiral-motor-transmission-gear","title":"1\/2\/3 Mod Helical Gear With Step 45° Left Right Spiral Motor Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1\/2\/3 Mod Helical Gear — Precision 45° Spiral for Motor Transmission Drives\u003c\/h2\u003e\n\u003cp\u003eWhen spur gears generate too much noise or vibration for your application, engineers and makers turn to helical gears for smoother, quieter power transfer. These 45° helical gears are designed for builders working on CNC routers, robotic joints, motorized actuators, and custom drive trains who need reliable torque transmission without the chatter of straight-cut teeth.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from carbon steel with a stepped bore hub, available in Modulus 1, 1.5, 2, and 3. Tooth counts range from 10 to 60 teeth, and bore diameters span 8 mm (0.31 in) to 20 mm (0.79 in). The 45° helix angle is available in both left-hand and right-hand spiral orientations to suit paired-gear assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC axis drives requiring low-backlash helical gear sets, robotic arm joint reduction stages using paired left\/right spiral gears, and custom motor transmission gearboxes for 3D printers, automation rigs, and DIY electric vehicles.\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 same-modulus helical gears of opposite helix hand (left pairs with right). Verify modulus, pressure angle (typically 20°), and bore diameter before ordering. Step hub accommodates standard shaft keyways.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Helical Transmission Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45° Helix Angle — Left \u0026amp; Right Hand Available\u003c\/strong\u003e\u003cbr\u003ePaired left\/right spiral orientation allows proper meshing in counter-rotating gear sets, reducing axial thrust imbalance when used as a matched pair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eMulti-Modulus Selection: 1 \/ 1.5 \/ 2 \/ 3\u003c\/strong\u003e\u003cbr\u003eFour modulus options cover a wide range of torque and speed requirements — from compact M1 gears for light-duty robotics to robust M3 gears for heavy motor drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStepped Bore Hub Design\u003c\/strong\u003e\u003cbr\u003eThe integrated step hub provides a positive axial stop for shaft positioning, simplifying assembly and improving concentricity on motor output shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from carbon steel for the strength and wear resistance needed in continuous-duty drive applications, including CNC feed axes and motorized gantries.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range: 10–60 Teeth\u003c\/strong\u003e\u003cbr\u003eSelect from 10 to 60 teeth to dial in your gear ratio. Larger tooth counts suit low-speed, high-torque stages; smaller counts work for high-speed reduction inputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes: 8 mm to 20 mm\u003c\/strong\u003e\u003cbr\u003eBore options from 8 mm to 20 mm (0.31–0.79 in) accommodate common motor shaft diameters used in NEMA stepper motors, servo motors, and DC gear motors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Helical Transmission Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModulus Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 1.5 \/ 2 \/ 3\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\u003eSpiral Direction\u003c\/th\u003e\n\u003ctd\u003eLeft-hand \/ Right-hand (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003eSee variant options (10–60 teeth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (8–20 mm \/ 0.31–0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped bore hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\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 PCS\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 modulus for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModulus determines the tooth size and load capacity. Modulus 1 suits light-duty robotics and small mechanisms. Modulus 1.5 and 2 cover mid-range CNC and automation drives. Modulus 3 is suited for heavy motor transmission with higher torque demands. Match the modulus to your mating gear — mismatched moduli will not mesh correctly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a left-hand and right-hand gear to mesh together?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Helical gears on parallel shafts must be of opposite hand — a left-hand gear meshes with a right-hand gear of the same modulus and helix angle. If you are replacing a single gear in an existing assembly, identify the hand of the existing gear before ordering.\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. Common NEMA 17 stepper shafts are 5 mm, NEMA 23 are typically 6.35 mm or 8 mm, and servo motors vary from 8 mm to 20 mm. Select the bore that matches or is closest to your shaft — a keyway or set screw can be used to secure the gear on the shaft.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for continuous-duty CNC use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel helical gears at 45° helix angle provide good load distribution across multiple teeth simultaneously, making them well-suited for continuous-duty CNC axis drives at moderate speeds and loads. For very high-speed or high-load applications, verify the specific modulus and tooth count against your torque and speed requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears corrode if used in a humid or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel is susceptible to surface oxidation in humid or wet environments. For outdoor or high-humidity applications, apply a light machine oil or grease to the gear teeth and bore, or consider a protective coating. Regular lubrication will extend service life significantly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the gear ratio for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio = number of teeth on driven gear ÷ number of teeth on driving gear. For example, a 30-tooth driven gear paired with a 15-tooth driving gear gives a 2:1 reduction ratio. The center distance between shafts = (teeth of gear 1 + teeth of gear 2) × modulus ÷ 2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears with a standard keyway shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe stepped bore hub is designed to accommodate standard shaft fits. Whether a keyway slot is pre-cut depends on the specific variant — Contact us to confirm keyway availability for your selected bore size. A set screw arrangement is a common alternative for securing the gear to the shaft.\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 Modulus, Teeth 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 modulus for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Modulus determines the tooth size and load capacity. Modulus 1 suits light-duty robotics and small mechanisms. Modulus 1.5 and 2 cover mid-range CNC and automation drives. Modulus 3 is suited for heavy motor transmission with higher torque demands. Match the modulus to your mating gear — mismatched moduli will not mesh correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a left-hand and right-hand gear to mesh together?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Helical gears on parallel shafts must be of opposite hand — a left-hand gear meshes with a right-hand gear of the same modulus and helix angle. If you are replacing a single gear in an existing assembly, identify the hand of the existing gear before ordering.\"\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. Common NEMA 17 stepper shafts are 5 mm, NEMA 23 are typically 6.35 mm or 8 mm, and servo motors vary from 8 mm to 20 mm. Select the bore that matches or is closest to your shaft — a keyway or set screw can be used to secure the gear on the shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty CNC use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel helical gears at 45° helix angle provide good load distribution across multiple teeth simultaneously, making them well-suited for continuous-duty CNC axis drives at moderate speeds and loads. For very high-speed or high-load applications, verify the specific modulus and tooth count against your torque and speed requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode if used in a humid or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel is susceptible to surface oxidation in humid or wet environments. For outdoor or high-humidity applications, apply a light machine oil or grease to the gear teeth and bore, or consider a protective coating. Regular lubrication will extend service life significantly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the gear ratio for my drive system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio = number of teeth on driven gear ÷ number of teeth on driving gear. For example, a 30-tooth driven gear paired with a 15-tooth driving gear gives a 2:1 reduction ratio. The center distance between shafts = (teeth of gear 1 + teeth of gear 2) × modulus ÷ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with a standard keyway shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stepped bore hub is designed to accommodate standard shaft fits. Whether a keyway slot is pre-cut depends on the specific variant — contact us to confirm keyway availability for your selected bore size. 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