{"product_id":"1-module-helical-gear-with-step-45-left-right-spiral-motor-transmission-gear","title":"1 Module 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 Module Helical Gear with 45° Spiral — Reliable Motor Transmission Drive Component\u003c\/h2\u003e\n\u003cp\u003eWhen a standard spur gear introduces too much noise or vibration into your drive train, engineers and makers reach for helical gears. This 1 Module Helical Gear with 45° spiral angle delivers smoother tooth engagement and quieter operation, making it the go-to choice for hobbyists, robotics builders, and small-machine designers who need dependable rotational power transfer without the clatter of straight-cut gears.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from engineering-grade steel and features a 45° helix angle available in both left-hand (Left Spiral) and right-hand (Right Spiral) configurations. The tooth count spans from 26 to 80 teeth, with bore diameters ranging from 8 mm (0.31 in) to 25 mm (0.98 in). Keyway variants are available with standard DIN keyway dimensions — 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, and 6×2.8 mm — to suit a wide range of shaft sizes. The stepped hub design provides axial location and simplifies assembly onto motor shafts.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor output stages in CNC router Z-axis drives, servo-driven conveyor reduction stages, and compact gearbox assemblies in 3D printer extruder mechanisms. The 1-module pitch makes these gears directly interchangeable with other Module 1 components, enabling straightforward gear-ratio selection for custom motor transmission gear projects.\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 Module 1 (1 mod) pitch standard. Mates with any Module 1 helical gear of the same helix angle and opposite hand (left meshes with right). Verify bore diameter and keyway dimensions against your shaft before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1 Module 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\u003e45° Helix Angle\u003c\/strong\u003e\n\u003cp\u003eThe 45° spiral angle maximises tooth overlap ratio, distributing load across multiple teeth simultaneously for smoother, quieter operation compared to straight-cut spur gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e↔️\u003c\/div\u003e\n\u003cstrong\u003eLeft \u0026amp; Right Spiral Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in both left-hand and right-hand spiral configurations. Helical gears of opposite hand mesh together on parallel shafts, giving you full flexibility in drive layout design.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth \u0026amp; Bore Range\u003c\/strong\u003e\n\u003cp\u003e26 to 80 teeth and bore diameters from 8 mm to 25 mm (0.31–0.98 in) cover a broad range of gear ratios and shaft sizes in a single product family.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n\u003cstrong\u003eOptional Keyway Variants\u003c\/strong\u003e\n\u003cp\u003eSelect from plain bore or keyway-bored versions (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) to match standard DIN shaft keyways and eliminate rotational slip under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e\n\u003cp\u003eThe integrated step on the hub provides a positive axial shoulder for easy shaft positioning and reduces the need for additional spacers during assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eModule 1 Interchangeability\u003c\/strong\u003e\n\u003cp\u003eConforms to the Module 1 pitch standard, allowing direct substitution or pairing with other Mod 1 gears, racks, and pinions for scalable motor transmission gear systems.\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\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1\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 Spiral \/ Right Spiral (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e26 \/ 28 \/ 30 \/ 36 \/ 40 \/ 45 \/ 50 \/ 60 \/ 72 \/ 80 teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 – 25 mm (0.31 – 0.98 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003ePlain bore or keyway (3×1.4 \/ 4×1.8 \/ 5×2.3 \/ 6×2.8 mm) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Standard\u003c\/th\u003e\n\u003ctd\u003eModule 1 (metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\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 the right tooth count and bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFirst determine your required gear ratio: divide the driven gear tooth count by the driving gear tooth count. Then match the bore diameter to your motor or shaft diameter. If your shaft has a keyway, select the corresponding keyway variant (e.g., 5×2.3 mm for a 14–17 mm shaft). Use the variant selector above to filter by Teeth \u0026amp; Bore.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo left-spiral and right-spiral gears mesh together?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. On parallel shafts, a left-hand helical gear meshes with a right-hand helical gear of the same module and helix angle. If you need two gears on the same shaft driving a single output, both driving gears must be the same hand. Confirm your drive layout before ordering both spiral directions.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the helix angle and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe helix angle is the angle between the tooth trace and the gear axis — 45° in this case. A higher helix angle increases the tooth overlap ratio, meaning more teeth share the load at any instant. This results in smoother, quieter operation and higher load capacity per tooth compared to spur gears, at the cost of introducing an axial thrust force that must be managed by thrust bearings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with Module 1 spur gears or racks?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears share the Module 1 pitch but have a 45° helix angle. They will not mesh correctly with straight-cut (0° helix) Module 1 spur gears or standard Module 1 racks. They must be paired with other Module 1 helical gears of the same helix angle and opposite hand for parallel-shaft applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat material are these gears made from, and how corrosion-resistant are they?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gears are machined from engineering-grade steel. Steel helical gears offer good strength and wear resistance for dry or lightly lubricated environments. For applications exposed to moisture or corrosive media, consider applying a light machine oil or grease coating, or contact us to confirm material options for your specific environment.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a high-speed motor drive application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, helical gears are well-suited to higher-speed applications due to their gradual tooth engagement. Ensure the bore fits your shaft with an appropriate tolerance (typically H7\/h6 for a sliding fit), use a keyway variant if torque is high, and apply adequate lubrication. For very high-speed or high-load applications, consult a mechanical engineer to verify dynamic load ratings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between plain bore and keyway bore variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePlain bore variants have a smooth cylindrical bore and rely on a set screw or interference fit to transmit torque. Keyway bore variants include a machined slot that accepts a standard key, providing a positive mechanical connection between the gear and shaft. Keyway variants are recommended for applications with reversing loads or where precise angular positioning is required.\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 Teeth \u0026amp; Bore size and Direction of Rotation 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 and bore size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"First determine your required gear ratio: divide the driven gear tooth count by the driving gear tooth count. Then match the bore diameter to your motor or shaft diameter. If your shaft has a keyway, select the corresponding keyway variant. Use the variant selector to filter by Teeth \u0026 Bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do left-spiral and right-spiral gears mesh together?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. On parallel shafts, a left-hand helical gear meshes with a right-hand helical gear of the same module and helix angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the helix angle and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The helix angle is 45°. A higher helix angle increases tooth overlap ratio, resulting in smoother, quieter operation and higher load capacity per tooth compared to spur gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears compatible with Module 1 spur gears or racks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. These Module 1 helical gears with 45° helix angle will not mesh with straight-cut Module 1 spur gears or racks. They must be paired with other Module 1 helical gears of the same helix angle and opposite hand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What material are these gears made from, and how corrosion-resistant are they?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gears are machined from engineering-grade steel. For applications exposed to moisture, apply a light machine oil or grease coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a high-speed motor drive application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, helical gears are well-suited to higher-speed applications due to their gradual tooth engagement. Ensure proper bore fit, use a keyway variant for high torque, and apply adequate lubrication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between plain bore and keyway bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Plain bore variants rely on a set screw or interference fit. Keyway bore variants include a machined slot for a positive mechanical connection, recommended for reversing loads or precise angular positioning.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Models \/ Left Spiral \/ 26 Teeth \u0026 8 mm","offer_id":52439958520082,"sku":"GYJLTGFCD03817x1","price":13.7,"currency_code":"USD","in_stock":true},{"title":"1 Models \/ Left Spiral \/ 26 Teeth \u0026 10 mm","offer_id":52439958552850,"sku":"GYJLTGFCD03818x1","price":13.55,"currency_code":"USD","in_stock":true},{"title":"1 Models \/ Left Spiral \/ 26 Teeth \u0026 12 mm","offer_id":52439958585618,"sku":"GYJLTGFCD03819x1","price":13.4,"currency_code":"USD","in_stock":true},{"title":"1 Models \/ Left Spiral \/ 26 Teeth \u0026 14 mm","offer_id":52439958618386,"sku":"GYJLTGFCD03820x1","price":13.25,"currency_code":"USD","in_stock":true},{"title":"1 Models \/ Left Spiral \/ 26 Teeth \u0026 15 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