{"product_id":"1-5-mod-spur-gear-10t-to-100t-teeth-flat-gear-motor-transmission-gear-45-steel","title":"1.5 Mod Spur Gear 10T to 100T Teeth Flat Gear Motor Transmission Gear 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Module Spur Gear — Precision 45# Steel Flat Transmission Gear for Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a motion-control build demands repeatable, low-backlash power transfer, the wrong gear becomes the weakest link in the entire drivetrain. Makers, CNC builders, and automation engineers who need a reliable 1.5 module spur gear in a wide tooth-count range will find this flat transmission gear a dependable drop-in for motor output shafts and reduction stages.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of machinability and surface hardness suited to moderate-to-heavy load applications. The 1.5 modulus (Module 1.5) standard governs tooth profile geometry, ensuring interchangeability with any mating gear of the same module. Tooth counts span 10 T to 100 T (select your variant), with outer diameters ranging from approximately 18 mm (0.71 in) for the 10-tooth gear up to approximately 153 mm (6.02 in) for the 100-tooth gear, calculated at the standard pitch diameter formula OD ≈ (T + 2) × m.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC router Z-axis drives requiring a compact 1.5 mod spur gear for stepper motor coupling, robotics joint reduction stages where a flat gear motor transmission gear keeps the assembly profile low, and small industrial conveyor or indexing mechanisms that need a standardized 45-steel gear for long service intervals.\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 Fits any mating spur gear of Module 1.5 (Mod 1.5 \/ m1.5). Bore diameter varies by tooth count — confirm bore size from variant listing before ordering. Suitable for parallel-shaft gear trains; not intended for helical or bevel gear applications.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1.5 Module Spur 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# Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMedium-carbon 45# steel delivers solid tensile strength and wear resistance for motor transmission and reduction gear applications under sustained load.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eModule 1.5 Standard Profile\u003c\/strong\u003e\n\u003cp\u003eTooth geometry conforms to the Module 1.5 international standard, ensuring direct mesh compatibility with any m1.5 rack, pinion, or mating spur gear.\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 Range (10 T – 100 T)\u003c\/strong\u003e\n\u003cp\u003eSelect from 10 to 100 teeth in a single product listing to dial in your exact gear ratio without sourcing from multiple suppliers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eFlat Gear Profile for Compact Assemblies\u003c\/strong\u003e\n\u003cp\u003eThe flat (straight-cut) spur design keeps axial forces near zero, making it ideal for thin-profile motor mounts and space-constrained CNC or robotics frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eConsistent Pitch Accuracy\u003c\/strong\u003e\n\u003cp\u003eMachined tooth spacing maintains consistent pitch circle diameter across the full tooth-count range, supporting smooth, low-vibration power transfer in indexing and drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛠️\u003c\/div\u003e\n\u003cstrong\u003eMachinable for Custom Bore Sizing\u003c\/strong\u003e\n\u003cp\u003e45# steel responds well to lathe boring and keyway milling, allowing the bore to be opened or keyed to match non-standard motor shaft diameters on the workbench.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1.5 Module Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Module (m)\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 T – 100 T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (straight-cut, flat face)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003em × T (e.g., 1.5 × 20 = 30 mm for 20T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e(T + 2) × 1.5 mm — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width (Hub Thickness)\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\u003ctr\u003e\n\u003cth\u003ePackage Contents\u003c\/th\u003e\n\u003ctd\u003e1 PCS spur gear (per unit ordered)\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 gear ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the driven gear tooth count by the driver gear tooth count to get your reduction ratio. For example, pairing a 20-tooth driver with a 60-tooth driven gear gives a 3:1 reduction. Select the tooth count that achieves your target ratio when meshed with your existing pinion or rack. All gears in this listing share Module 1.5, so any two variants will mesh correctly with each other.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Module 1.5 rack or pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear marked Module 1.5 (m1.5) with a 20° pressure angle will mesh with any other m1.5 component regardless of tooth count. Confirm that your existing rack or pinion is also Module 1.5 before ordering — mixing modules (e.g., m1.0 with m1.5) will result in incorrect mesh and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel for motor transmission applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition, making it suitable for moderate-torque motor drives, CNC axis feeds, and light industrial indexing. For very high-torque or shock-load applications, consider heat-treated variants or upgrading to alloy steel gears. For most hobby CNC, robotics, and small automation builds, 45# steel provides adequate service life.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For outdoor, humid, or washdown environments, apply a light machine oil or grease coating during operation, or consider a zinc-plated or stainless-steel alternative. For indoor CNC and robotics enclosures with controlled humidity, bare 45# steel performs well with standard lubrication maintenance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I modify the bore diameter to fit my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 45# steel is readily machinable on a lathe. The bore can be opened to a larger diameter or a keyway can be milled to accept a keyed shaft. Ensure the remaining wall thickness after boring is sufficient for your torque load — as a conservative guideline, maintain at least 3–5 mm of wall between the bore and the root circle of the teeth.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a flat spur gear and a helical gear, and which should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpur gears (like this one) have straight teeth parallel to the gear axis, producing no axial thrust force and making them easy to install and replace. They are the correct choice for most CNC, robotics, and general automation drives where simplicity and interchangeability matter. Helical gears have angled teeth that engage more gradually, producing lower noise at high speeds but generating axial thrust that requires thrust bearings. Choose this spur gear for straightforward parallel-shaft drives; choose helical gears only if noise at high RPM is a primary concern and your design accommodates thrust loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the center distance between two meshing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (T1 + T2) × m ÷ 2, where T1 and T2 are the tooth counts of the two meshing gears and m is the module (1.5). For example, a 20-tooth and a 40-tooth gear: (20 + 40) × 1.5 ÷ 2 = 45 mm center distance. Use this formula to set your shaft spacing accurately during frame design.\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 gear tooth count (and quantity) 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 gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear tooth count by the driver gear tooth count to get your reduction ratio. For example, pairing a 20-tooth driver with a 60-tooth driven gear gives a 3:1 reduction. Select the tooth count that achieves your target ratio when meshed with your existing pinion or rack. All gears in this listing share Module 1.5, so any two variants will mesh correctly with each other.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 1.5 rack or pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any gear marked Module 1.5 (m1.5) with a 20° pressure angle will mesh with any other m1.5 component regardless of tooth count. Confirm that your existing rack or pinion is also Module 1.5 before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# steel for motor transmission applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition, making it suitable for moderate-torque motor drives, CNC axis feeds, and light industrial indexing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during operation, or consider a zinc-plated or stainless-steel alternative.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I modify the bore diameter to fit my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 45# steel is readily machinable on a lathe. The bore can be opened to a larger diameter or a keyway can be milled to accept a keyed shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a flat spur gear and a helical gear, and which should I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spur gears have straight teeth parallel to the gear axis, producing no axial thrust force. They are the correct choice for most CNC, robotics, and general automation drives. Choose helical gears only if noise at high RPM is a primary concern and your design accommodates thrust loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the center distance between two meshing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (T1 + T2) × m ÷ 2, where T1 and T2 are the tooth counts and m is the module (1.5). For example, a 20-tooth and a 40-tooth gear: (20 + 40) × 1.5 ÷ 2 = 45 mm center distance.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Modulus \/ 10 Teeth \/ 1 PCS","offer_id":52442537001234,"sku":"GYJLTHXCDZH0474x1","price":1.48,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus \/ 11 Teeth \/ 1 PCS","offer_id":52442537034002,"sku":"GYJLTHXCDZH0475x1","price":2.73,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus \/ 12 Teeth \/ 1 PCS","offer_id":52442537066770,"sku":"GYJLTHXCDZH0476x1","price":2.77,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus \/ 13 Teeth \/ 1 PCS","offer_id":52442537099538,"sku":"GYJLTHXCDZH0477x1","price":3.09,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus \/ 14 Teeth \/ 1 PCS","offer_id":52442537132306,"sku":"GYJLTHXCDZH0478x1","price":3.4,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus \/ 15 Teeth \/ 1 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