{"product_id":"3-module-spur-gear-pinion-gears-45-steel-10t-68t-cnc","title":"3 Module Spur Gear Pinion Gears #45 Steel 10T to 68T Metal Spur Transmission CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 Spur Gear Pinion — Reliable Metal Power Transmission for DIY Builders\u003c\/h2\u003e\n    \u003cp\u003eWhen your automation project demands consistent torque transfer and zero-slip meshing, a poorly matched gear can bring the whole build to a halt. Whether you are a maker building a CNC router, a hobbyist assembling a motorized platform, or a small workshop engineer maintaining industrial machinery, these Module 3 spur gear pinions give you the precision and material strength to keep your drivetrain running smoothly.\u003c\/p\u003e\n    \u003cp\u003eEach gear is CNC machined from #45 medium-carbon steel — a widely used engineering steel valued for its balanced hardness and toughness. The module (pitch) is 3, meaning the tooth pitch diameter equals 3 mm per tooth. Tooth counts range from 10T to 68T, covering pitch diameters of approximately 30 mm (1.18 in) at 10T up to 204 mm (8.03 in) at 68T. Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs.\u003c\/p\u003e\n    \u003cp\u003eThese module 3 metal spur gears are well suited for DIY CNC axis drives, 3D printer extruder gear trains, electric go-kart reduction stages, and light industrial conveyor pinion replacements — anywhere a standard Mod 3 gear mesh is required for reliable power transmission.\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 Meshes with any standard \u003cstrong\u003eModule 3\u003c\/strong\u003e spur gear or rack. Verify bore diameter and keyway against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 Spur Gear Pinions\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e#45 Steel Construction\u003c\/strong\u003e\u003cbr\u003e\n        CNC machined from #45 medium-carbon steel for a reliable balance of surface hardness and core toughness, resisting deformation under sustained load.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 3 Standard Pitch\u003c\/strong\u003e\u003cbr\u003e\n        True Mod 3 tooth geometry ensures accurate meshing with any standard Module 3 mating gear or rack — no custom tooling required.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range (10T – 68T)\u003c\/strong\u003e\u003cbr\u003e\n        53 tooth-count variants let you dial in the exact gear ratio your drivetrain needs, from compact 10-tooth pinions to large 68-tooth driven gears.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eCNC Machined Precision\u003c\/strong\u003e\u003cbr\u003e\n        Each gear is turned and hobbed on CNC equipment for consistent tooth spacing and concentricity, reducing vibration and noise in your gear train.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eStraight-Cut Spur Profile\u003c\/strong\u003e\u003cbr\u003e\n        Standard straight-tooth spur design transmits power efficiently along parallel shafts with no axial thrust load — ideal for most DIY and light industrial applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Replacement Ready\u003c\/strong\u003e\u003cbr\u003e\n        Standard Mod 3 dimensions make these gears direct replacements for worn pinions in conveyors, feeders, and motorized equipment without custom machining.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 3 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e10T – 68T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e30 mm – 204 mm \/ 1.18 in – 8.03 in (Module × Teeth)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e#45 Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eManufacturing Method\u003c\/th\u003e\n\u003ctd\u003eCNC Machined \u0026amp; Hobbed\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eStraight-Cut Spur Gear\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel (uncoated)\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 tooth count for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDetermine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, a 10T pinion driving a 30T gear gives a 3:1 reduction. Match the tooth counts to your motor speed and output torque requirements. If you are replacing an existing gear, count the teeth on the worn part and select the same number.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does \"Module 3\" mean, and will it mesh with my existing gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"Module\" (abbreviated M or Mod) is the metric standard for gear tooth size. Module 3 means the pitch diameter equals 3 mm multiplied by the number of teeth. Two gears mesh correctly only when they share the same module and pressure angle. These gears are Module 3 with a 20° pressure angle — they will mesh with any other standard Mod 3 \/ 20° spur gear or rack, regardless of brand.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs #45 steel strong enough for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e#45 steel (equivalent to AISI 1045) has a tensile strength of approximately 600–800 MPa in the normalized condition. It is suitable for moderate-load applications such as CNC axis drives, conveyor pinions, and motorized hobby projects. For very high-torque or high-speed industrial applications, consider whether a hardened or alloy steel gear would be more appropriate for your specific load cycle.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are made from carbon steel and are supplied with a natural (uncoated) finish, which means they are not inherently corrosion resistant. For use in humid or outdoor environments, we recommend applying a light machine oil or grease to the tooth surfaces and bore, or using a rust-inhibiting coating. If corrosion resistance is a primary requirement, consider stainless steel or plastic gears instead.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the bore diameter, and can I re-bore the gear to fit my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count — please check the variant detail or contact us to confirm the bore size for your selected tooth count before ordering. #45 steel is machinable, so a qualified machine shop can re-bore or add a keyway if the standard bore does not match your shaft. Always confirm wall thickness is sufficient before enlarging the bore.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears for a 3D printer or CNC router build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 3 metal spur gears are commonly used in DIY CNC router axis drives, extruder gear trains, and motorized linear stages. The smaller tooth counts (10T–20T) are popular as motor pinions, while larger counts serve as driven gears in reduction stages. Verify that the bore matches your motor shaft diameter and that the face width suits your belt or gear alignment requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I lubricate and maintain these spur gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eApply a thin film of gear grease or machine oil to the tooth flanks before first use. For enclosed gearboxes, an ISO VG 220 gear oil is typical. For open drives, a lithium-based grease works well. Re-lubricate periodically based on operating hours and environment. Keep the gear mesh free of debris to prevent accelerated tooth wear.\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 \u003cstrong\u003eModulus \/ Teeth \/ Amount\u003c\/strong\u003e 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 project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Determine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, a 10T pinion driving a 30T gear gives a 3:1 reduction. Match the tooth counts to your motor speed and output torque requirements. If you are replacing an existing gear, count the teeth on the worn part and select the same number.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Module 3 mean, and will it mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module 3 means the pitch diameter equals 3 mm multiplied by the number of teeth. These gears are Module 3 with a 20 degree pressure angle and will mesh with any standard Mod 3 \/ 20 degree spur gear or rack.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is #45 steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"#45 steel has a tensile strength of approximately 600-800 MPa and is suitable for moderate-load applications such as CNC axis drives, conveyor pinions, and motorized hobby projects.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are carbon steel with a natural uncoated finish and are not inherently corrosion resistant. Apply machine oil or grease for protection in humid environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the bore diameter, and can I re-bore the gear to fit my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count. Please check the variant detail or contact us to confirm. #45 steel is machinable and can be re-bored by a qualified machine shop.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears for a 3D printer or CNC router build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 3 metal spur gears are commonly used in DIY CNC router axis drives, extruder gear trains, and motorized linear stages. Verify bore and face width match your build requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I lubricate and maintain these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Apply gear grease or machine oil to tooth flanks before first use. For enclosed gearboxes use ISO VG 220 gear oil; for open drives use lithium-based grease. Re-lubricate periodically and keep the mesh free of debris.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3 Modulus \/ 10 Teeth \/ 1 PCS","offer_id":52443279819026,"sku":"GYJLTHXCDZH1497x1","price":14.95,"currency_code":"USD","in_stock":true},{"title":"3 Modulus \/ 11 Teeth \/ 1 PCS","offer_id":52443279851794,"sku":"GYJLTHXCDZH1498x1","price":21.77,"currency_code":"USD","in_stock":true},{"title":"3 Modulus \/ 12 Teeth \/ 1 PCS","offer_id":52443279884562,"sku":"GYJLTHXCDZH1499x1","price":21.83,"currency_code":"USD","in_stock":true},{"title":"3 Modulus \/ 13 Teeth \/ 1 PCS","offer_id":52443279917330,"sku":"GYJLTHXCDZH1500x1","price":27.61,"currency_code":"USD","in_stock":true},{"title":"3 Modulus \/ 14 Teeth \/ 1 PCS","offer_id":52443279950098,"sku":"GYJLTHXCDZH1501x1","price":28.41,"currency_code":"USD","in_stock":true},{"title":"3 Modulus \/ 15 Teeth \/ 1 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