{"product_id":"1-1-5-2-modulus-helical-gear-with-step-45-right-spiral-motor-transmission-gear","title":"1\/1.5\/2 Modulus Helical Gear With Step 45° Right Spiral Motor Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModulus Helical Gear With Step — Precision 45° Right Spiral for Motor Transmission Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a standard spur gear introduces too much noise or axial play into your drive train, engineers and makers turn to helical gears for smoother, quieter power transfer. These stepped-bore helical gears are designed for builders working on CNC routers, robotic arms, conveyor drives, and custom motor transmission assemblies who need a reliable, drop-in gear with a defined bore and a consistent helix angle.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# carbon steel and features a 45° right-hand spiral angle with an integrated step (shoulder) on the bore side for precise axial positioning. Available in three modulus values — 1, 1.5, and 2 — with tooth counts ranging from 10 to 60 teeth and bore diameters from 8 mm (0.31 in) to 19 mm (0.75 in). Outer diameter scales with modulus and tooth count, typically ranging from approximately 12 mm (0.47 in) for the smallest variants up to 122 mm (4.80 in) for the largest.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include pairing with a matching left-spiral helical gear for parallel-shaft gearboxes in desktop CNC machines, integrating into stepper or servo motor output shafts for 3D printer extruder drives, and building custom reduction stages for robotic joint actuators where low backlash and quiet operation are critical.\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 opposite-hand (left-spiral) helical gears of the same modulus and pressure angle (20°). Verify bore diameter matches your shaft before ordering. Stepped bore provides a shoulder reference face for axial positioning with a retaining ring or set screw.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Modulus 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\u003eThree Modulus Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in Modulus 1, 1.5, and 2 to match a wide range of gear ratio and torque requirements across different drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e45° Right-Hand Helix Angle\u003c\/strong\u003e\n\u003cp\u003eThe 45° spiral angle delivers smooth, progressive tooth engagement that reduces vibration and noise compared to straight-cut spur gears in the same application.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eStepped Bore for Axial Location\u003c\/strong\u003e\n\u003cp\u003eThe integrated shoulder step on the bore allows precise axial positioning on the shaft, eliminating the need for additional spacers in most installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eWide Teeth \u0026amp; Bore Selection\u003c\/strong\u003e\n\u003cp\u003eChoose from 10 to 60 teeth and bore sizes from 8 mm to 19 mm, giving you the flexibility to match your exact shaft diameter and gear ratio target.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# medium-carbon steel for a balance of strength, machinability, and wear resistance suitable for continuous-duty motor transmission use.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003e20° Pressure Angle Standard\u003c\/strong\u003e\n\u003cp\u003eConforms to the standard 20° pressure angle, ensuring compatibility with off-the-shelf mating helical gears and standard gear-cutting tooling for custom modifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Helical Transmission Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModulus Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 1.5 \/ 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHelix Angle\u003c\/th\u003e\n\u003ctd\u003e45° Right-Hand Spiral\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\u003eTeeth Range\u003c\/th\u003e\n\u003ctd\u003e10 – 60 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 17 \/ 19 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Style\u003c\/th\u003e\n\u003ctd\u003eStepped (shouldered) bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ uncoated machined surface\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 size of the gear teeth relative to the pitch diameter. A higher modulus (e.g., 2) means larger, stronger teeth suitable for higher torque loads, while a lower modulus (e.g., 1) gives finer teeth for compact, lower-torque drives. Match the modulus to your mating gear and confirm the center distance fits your housing 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 or gearbox output shaft diameter with a caliper. Select the bore option that matches — available in 8, 10, 12, 14, 15, 17, and 19 mm. The stepped bore provides a shoulder for axial location; you can secure the gear with a set screw or retaining ring in the groove behind the step.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan this gear mesh with a spur gear of the same modulus?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. Helical gears must mesh with other helical gears of the same modulus, pressure angle, and opposite hand (a right-hand gear meshes with a left-hand gear on parallel shafts). Mixing helical and spur gears of the same modulus is not recommended as the tooth geometry differs and will cause rapid wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# carbon steel suitable for outdoor or high-humidity environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel offers good mechanical strength but has limited corrosion resistance in wet or outdoor environments. For applications exposed to moisture, consider applying a light machine oil coating for protection, or consult us about alternative material options. For dry, enclosed gearbox environments this material performs reliably over extended service life.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many teeth should I choose to achieve a specific gear ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio equals the number of teeth on the driven gear divided by the number of teeth on the driving gear. For example, pairing a 15-tooth driver with a 30-tooth driven gear gives a 2:1 reduction. Select your tooth counts based on your required ratio and verify the resulting center distance fits your mechanical design.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the advantage of a 45° helix angle over a lower helix angle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 45° helix angle maximizes the overlap ratio, meaning multiple teeth are always in contact simultaneously. This results in very smooth, quiet operation and distributes load across more tooth surface area. The trade-off is a higher axial thrust force on the shaft bearings, so ensure your bearing selection accounts for both radial and axial loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a 3D printer or CNC router build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears are well-suited for desktop CNC router spindle drives, extruder gear trains, and Z-axis reduction stages where quiet operation and compact size matter. Select the modulus and tooth count that matches your target gear ratio and confirm the bore fits your stepper or servo motor shaft diameter.\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 Gear 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 size of the gear teeth relative to the pitch diameter. A higher modulus (e.g., 2) means larger, stronger teeth suitable for higher torque loads, while a lower modulus (e.g., 1) gives finer teeth for compact, lower-torque drives. Match the modulus to your mating gear and confirm the center distance fits your housing 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 or gearbox output shaft diameter with a caliper. Select the bore option that matches — available in 8, 10, 12, 14, 15, 17, and 19 mm. The stepped bore provides a shoulder for axial location; you can secure the gear with a set screw or retaining ring.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this gear mesh with a spur gear of the same modulus?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Helical gears must mesh with other helical gears of the same modulus, pressure angle, and opposite hand. Mixing helical and spur gears is not recommended as the tooth geometry differs and will cause rapid wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# carbon steel suitable for outdoor or high-humidity environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has limited corrosion resistance in wet environments. Apply a light machine oil coating for protection in humid conditions. For dry, enclosed gearbox environments this material performs reliably.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many teeth should I choose to achieve a specific gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio equals the number of teeth on the driven gear divided by the number of teeth on the driving gear. For example, a 15-tooth driver with a 30-tooth driven gear gives a 2:1 reduction.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the advantage of a 45° helix angle over a lower helix angle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A 45° helix angle maximizes the overlap ratio so multiple teeth are always in contact, resulting in smooth, quiet operation and distributed load. The trade-off is higher axial thrust force on shaft bearings.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer or CNC router build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears are well-suited for desktop CNC router spindle drives, extruder gear trains, and Z-axis reduction stages. Select the modulus and tooth count that matches your target gear ratio and confirm the bore fits your motor shaft diameter.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Modulus \/ 15 Teeth \/ 8mm \u0026 1 PCS","offer_id":52439925555474,"sku":"GYJLTHXCDZH1856x1","price":13.57,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 15 Teeth \/ 10mm \u0026 1 PCS","offer_id":52439925588242,"sku":"GYJLTHXCDZH1857x1","price":11.83,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 18 Teeth \/ 8mm \u0026 1 PCS","offer_id":52439925621010,"sku":"GYJLTHXCDZH1858x1","price":13.3,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 18 Teeth \/ 10mm \u0026 1 PCS","offer_id":52439925653778,"sku":"GYJLTHXCDZH1859x1","price":13.3,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 18 Teeth \/ 12mm \u0026 1 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