{"product_id":"1-modulus-helical-gear-45-left-spiral-45-steel","title":"1 Modulus Helical Gear With Step 45°Left Spiral Motor Transmission Gear 45#Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Modulus Helical Gear with Step — 45° Left Spiral Transmission Gear for Precision Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotic arm, or motor-driven mechanism demands smooth, low-noise power transfer, a poorly matched gear becomes the weakest link in the entire drivetrain. Engineers, makers, and automation builders who need reliable helical gear engagement without backlash-induced vibration will find this 1 modulus left-spiral stepped gear a dependable solution for demanding applications.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# carbon steel, offering a solid balance of tensile strength and machinability. The stepped hub design allows secure shaft mounting across bore diameters ranging from 6 mm (0.24 in) to 16 mm (0.63 in). Tooth counts span 13T, 15T, 20T, 26T, and 30T — covering a wide range of gear ratios for speed reduction or torque multiplication. The 45° left-hand helix angle ensures gradual tooth engagement, reducing impact load and operating noise compared to straight-cut spur gears.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor output shafts in tabletop CNC machines, stepper-driven axis drives in 3D printer extruder assemblies, and paired helical gear sets in custom gearbox builds for robotics competitions or industrial automation prototypes. The consistent 1-modulus pitch makes cross-pairing with standard metric gear racks and mating gears straightforward.\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 for 1 modulus metric gear systems. Pairs with standard 1M gear racks, pinions, and mating helical gears. Bore options: 6 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16 mm. Verify shaft diameter and helix hand (left spiral) before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1 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\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# medium-carbon steel for reliable strength under continuous rotational load, suitable for motor transmission and automation drivetrain 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-Hand Helix Angle\u003c\/strong\u003e\n\u003cp\u003eThe left-spiral 45° helix promotes gradual tooth engagement, distributing load across multiple teeth simultaneously to reduce noise and vibration in high-speed drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eStepped Hub for Secure Shaft Fit\u003c\/strong\u003e\n\u003cp\u003eThe integrated step on the hub provides a positive axial stop for shaft positioning, simplifying assembly and improving concentricity in tight-tolerance builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth Count Selection (13T–30T)\u003c\/strong\u003e\n\u003cp\u003eFive tooth count options — 13, 15, 20, 26, and 30 teeth — let you dial in the gear ratio needed for your specific speed-torque requirement without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eBroad Bore Diameter Range (6–16 mm)\u003c\/strong\u003e\n\u003cp\u003eSeven bore sizes from 6 mm to 16 mm accommodate a wide variety of motor and gearbox output shafts, reducing the need for adapter sleeves or custom boring.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n\u003cstrong\u003eStandard 1 Modulus Metric Pitch\u003c\/strong\u003e\n\u003cp\u003eThe 1M pitch is fully compatible with standard metric gear racks and mating gears, making integration into existing 1-modulus drivetrain systems straightforward and repeatable.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1 Modulus 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\u003eHelix Direction\u003c\/th\u003e\n\u003ctd\u003eLeft (Left Spiral)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e13T \/ 15T \/ 20T \/ 26T \/ 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped Hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch System\u003c\/th\u003e\n\u003ctd\u003eMetric (1 Modulus)\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\u003eOverall 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\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\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 for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the tooth count based on your required gear ratio. Pair a lower tooth count (e.g., 13T or 15T) on the driving shaft with a higher tooth count on the driven shaft for speed reduction and torque increase. For a 1:1 ratio, use matching tooth counts on both gears. Refer to your drivetrain's speed and torque requirements to determine the ideal pairing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or gearbox output shaft diameter precisely with calipers. Select the bore size that matches your shaft — available in 6, 8, 10, 12, 14, 15, and 16 mm. If your shaft has a keyway, confirm whether the bore includes a matching keyway slot before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear compatible with standard metric gear racks?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This gear uses a standard 1 modulus (1M) metric pitch, which is compatible with any 1M metric gear rack or mating helical gear of the same module. Ensure the mating gear also uses a left-hand helix if you need parallel-axis engagement, or a right-hand helix for crossed-axis configurations.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# carbon steel for motor transmission use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel (equivalent to AISI 1045) has a tensile strength typically in the range of 600–800 MPa in normalized condition, making it well-suited for moderate-to-high load motor transmission applications. It offers a good balance of machinability and mechanical strength for CNC, robotics, and automation drivetrain use.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes the left-spiral helix direction matter for my build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — helix direction matters for parallel-axis gear pairs. Two mating gears on parallel shafts must have opposite helix hands (one left, one right) to mesh correctly. If you are replacing an existing gear, confirm the helix direction of the mating gear before ordering. For crossed-axis or worm-style configurations, consult your drivetrain design specifications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the stepped hub design and why does it help?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe stepped hub features a shoulder (step) machined into the hub body that acts as a positive axial stop when the gear is pressed or slid onto a shaft. This simplifies assembly by providing a consistent reference position, improving concentricity and reducing the chance of misalignment during installation — particularly useful in precision CNC and robotics builds.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a high-speed application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 45° helical tooth form is well-suited for higher-speed applications compared to straight-cut spur gears, as the gradual tooth engagement reduces impact load and noise. Actual maximum speed depends on your lubrication, shaft support (bearing arrangement), and load conditions. For sustained high-speed use, ensure adequate lubrication and proper shaft alignment.\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 tooth count and bore diameter 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\": \"Select the tooth count based on your required gear ratio. Pair a lower tooth count (e.g., 13T or 15T) on the driving shaft with a higher tooth count on the driven shaft for speed reduction and torque increase. For a 1:1 ratio, use matching tooth counts on both gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or gearbox output shaft diameter precisely with calipers. Select the bore size that matches your shaft — available in 6, 8, 10, 12, 14, 15, and 16 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear compatible with standard metric gear racks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This gear uses a standard 1 modulus (1M) metric pitch, compatible with any 1M metric gear rack or mating helical gear of the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# carbon steel for motor transmission use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has a tensile strength typically in the range of 600–800 MPa in normalized condition, well-suited for moderate-to-high load motor transmission applications in CNC, robotics, and automation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the left-spiral helix direction matter for my build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — two mating gears on parallel shafts must have opposite helix hands (one left, one right) to mesh correctly. Confirm the helix direction of the mating gear before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the stepped hub design and why does it help?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stepped hub features a shoulder machined into the hub body that acts as a positive axial stop, simplifying assembly and improving concentricity during installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a high-speed application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 45° helical tooth form is well-suited for higher-speed applications compared to straight-cut spur gears. Actual maximum speed depends on lubrication, shaft support, and load conditions.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Modulus 13Tooth \/ 6mm \/ 1pcs","offer_id":52439957733650,"sku":"FXLJGJXCD1065x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 13Tooth \/ 8mm \/ 1pcs","offer_id":52439957766418,"sku":"FXLJGJXCD1066x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 13Tooth \/ 10mm \/ 1pcs","offer_id":52439957799186,"sku":"FXLJGJXCD1067x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 15Tooth \/ 6mm \/ 1pcs","offer_id":52439957831954,"sku":"FXLJGJXCD1068x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 15Tooth \/ 8mm \/ 1pcs","offer_id":52439957864722,"sku":"FXLJGJXCD1069x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 15Tooth \/ 10mm \/ 1pcs","offer_id":52439957897490,"sku":"FXLJGJXCD1070x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 15Tooth \/ 12mm \/ 1pcs","offer_id":52439957930258,"sku":"FXLJGJXCD1071x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 6mm \/ 1pcs","offer_id":52439957963026,"sku":"FXLJGJXCD1072x1","price":5.37,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 8mm \/ 1pcs","offer_id":52439957995794,"sku":"FXLJGJXCD1073x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 10mm \/ 1pcs","offer_id":52439958028562,"sku":"FXLJGJXCD1074x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 12mm \/ 1pcs","offer_id":52439958061330,"sku":"FXLJGJXCD1075x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 14mm \/ 1pcs","offer_id":52439958094098,"sku":"FXLJGJXCD1076x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 15mm \/ 1pcs","offer_id":52439958126866,"sku":"FXLJGJXCD1077x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 20Tooth \/ 16mm \/ 1pcs","offer_id":52439958159634,"sku":"FXLJGJXCD1078x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 26Tooth \/ 10mm \/ 1pcs","offer_id":52439958192402,"sku":"FXLJGJXCD1080x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 26Tooth \/ 12mm \/ 1pcs","offer_id":52439958225170,"sku":"FXLJGJXCD1081x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 26Tooth \/ 14mm \/ 1pcs","offer_id":52439958257938,"sku":"FXLJGJXCD1082x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 26Tooth \/ 15mm \/ 1pcs","offer_id":52439958290706,"sku":"FXLJGJXCD1083x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 26Tooth \/ 16mm \/ 1pcs","offer_id":52439958323474,"sku":"FXLJGJXCD1084x1","price":8.23,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 30Tooth \/ 10mm \/ 1pcs","offer_id":52439958356242,"sku":"FXLJGJXCD1086x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 30Tooth \/ 12mm \/ 1pcs","offer_id":52439958389010,"sku":"FXLJGJXCD1087x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 30Tooth \/ 14mm \/ 1pcs","offer_id":52439958421778,"sku":"FXLJGJXCD1088x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 30Tooth \/ 15mm \/ 1pcs","offer_id":52439958454546,"sku":"FXLJGJXCD1089x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"1 Modulus 30Tooth \/ 16mm \/ 1pcs","offer_id":52439958487314,"sku":"FXLJGJXCD1090x1","price":10.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of11_6b5835aa-9d74-4309-8333-11fcc34ad52c.jpg?v=1783526524","url":"https:\/\/homediyer.com\/products\/1-modulus-helical-gear-45-left-spiral-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}