{"product_id":"module-2-5-spur-gear-10t-120t-45-steel-flat-gear-motor-transmission","title":"Module 2.5 Spur Gear 10T-120T Teeth Flat Gear Motor Transmission Gear 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 2.5 Spur Gear — Precision 45# Steel Flat Gear for Motor Transmission Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or undersized gear brings your motor drive, CNC router, or robotics project to a halt, you need a replacement that holds tolerance under load. These Module 2.5 spur gears are engineered for hobbyists, makers, and small-scale machine builders who demand repeatable, low-backlash power transmission without sourcing industrial minimums.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel — a material known for its balance of hardness and machinability — and finished to Module 2.5 (pitch = 2.5 mm per tooth) geometry. The tooth count range spans 10T through 120T, with pitch circle diameters scaling from approximately 25 mm (0.98 in) at 10T up to 300 mm (11.81 in) at 120T. Face width is typically 20–25 mm (0.79–0.98 in) depending on variant; bore diameter varies by tooth count — see variant options for exact bore specs.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor gearbox reduction stages for 3D printer extruder drives, stepper-motor-driven linear actuators in DIY CNC machines, and open-frame gear train assemblies in educational robotics platforms where a standard Module 2.5 pitch is specified.\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 Module 2.5 spur or helical gear of the same module. Confirm bore diameter and keyway requirements against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 2.5 Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Steel Construction\u003c\/strong\u003e — Medium-carbon steel delivers the hardness needed for sustained torque loads while remaining machinable for custom bore modifications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (10T–120T)\u003c\/strong\u003e — A single product line covers gear ratios from high-speed pinion applications up to large-diameter driven gears, reducing the need for multiple suppliers.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eModule 2.5 Standard Pitch\u003c\/strong\u003e — Interchangeable with any Module 2.5 gear in your existing drivetrain; no custom tooling required for meshing.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eFlat Gear Profile\u003c\/strong\u003e — Straight-cut spur tooth form minimises axial thrust forces, making these gears well-suited for parallel-shaft motor transmission layouts.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion Resistance\u003c\/strong\u003e — 45# steel with standard surface treatment resists light oxidation in indoor workshop and enclosed machine environments; apply grease for extended service life.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSold Individually (1 PCS)\u003c\/strong\u003e — Order exactly the tooth count you need; no forced bundle quantities. Mix and match sizes to build your complete gear train.\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 2.5 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 120T (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 (straight-cut, flat)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Teeth (e.g., 2.5 × 20T = 50 mm \/ 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eTypically 20–25 mm (0.79–0.98 in); 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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS per order\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\u003eDetermine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, a 20T pinion driving a 60T gear gives a 3:1 reduction. Select tooth counts that achieve your target ratio while keeping pitch circle diameters within your available centre-distance envelope. Use the formula: Centre Distance = (T1 + T2) × Module \/ 2.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load can these spur gears handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel spur gears at Module 2.5 are suited for light-to-medium duty applications — typical for DC motor drives, stepper-driven CNC axes, and educational robotics. Exact torque capacity depends on tooth count, face width, operating speed, and lubrication. For heavy industrial loads or continuous high-RPM service, consult an engineer and consider hardened or alloy steel alternatives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has moderate corrosion resistance suitable for dry indoor environments. For humid, wet, or outdoor use, apply a consistent film of gear grease or anti-rust oil, or consider stainless steel or nylon gear alternatives. Regular maintenance will significantly extend service life in challenging conditions.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Module 2.5 gears from another brand?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — Module 2.5 is an internationally standardised pitch. Any two Module 2.5 spur gears with a 20° pressure angle will mesh correctly regardless of brand, provided the bore and shaft dimensions are compatible. Verify the pressure angle of your existing gears before mixing.\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 shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 45# steel is machinable on a lathe or with a drill press. Many makers bore out the hub to their required shaft diameter and add a keyway or set-screw flat. Ensure sufficient hub wall thickness remains after boring — typically keep at least 3–5 mm of material around the bore for structural integrity.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the pitch circle diameter for a specific tooth count?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePitch Circle Diameter (PCD) = Module × Number of Teeth. For Module 2.5: a 20T gear has PCD = 2.5 × 20 = 50 mm (1.97 in); a 60T gear has PCD = 150 mm (5.91 in). The outside diameter (OD) = PCD + 2 × Module = PCD + 5 mm for Module 2.5 gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to lubricate these gears, and how often?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLubrication is strongly recommended for all steel spur gear applications. Apply a light gear grease or lithium-based grease to the tooth flanks before first use. Re-lubricate every 50–100 operating hours or whenever you notice increased noise or heat. Proper lubrication reduces wear, noise, and the risk of surface fatigue on the tooth flanks.\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\u003eModel \u0026amp; Teeth\u003c\/strong\u003e count 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\": \"Determine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. Use the formula: Centre Distance = (T1 + T2) × Module \/ 2 to verify fit within your centre-distance envelope.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load can these spur gears handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel spur gears at Module 2.5 are suited for light-to-medium duty applications such as DC motor drives, stepper-driven CNC axes, and educational robotics. Exact torque capacity depends on tooth count, face width, operating speed, and lubrication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has moderate corrosion resistance suitable for dry indoor environments. For humid or outdoor use, apply gear grease or anti-rust oil regularly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Module 2.5 gears from another brand?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 2.5 is an internationally standardised pitch. Any two Module 2.5 spur gears with a 20° pressure angle will mesh correctly regardless of brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I modify the bore diameter to fit my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 45# steel is machinable. You can bore out the hub to your required shaft diameter and add a keyway or set-screw flat. Keep at least 3–5 mm of hub wall thickness after boring.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the pitch circle diameter for a specific tooth count?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pitch Circle Diameter (PCD) = Module × Number of Teeth. For Module 2.5: a 20T gear has PCD = 50 mm; a 60T gear has PCD = 150 mm. Outside diameter = PCD + 5 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate these gears, and how often?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Apply gear grease or lithium-based grease to tooth flanks before first use. Re-lubricate every 50–100 operating hours or when increased noise or heat is noticed.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5M 10T \/ 1 PCS","offer_id":52442790363410,"sku":"Adaah058105x1","price":10.24,"currency_code":"USD","in_stock":true},{"title":"2.5M 11T \/ 1 PCS","offer_id":52442790396178,"sku":"Adaah058106x1","price":14.67,"currency_code":"USD","in_stock":true},{"title":"2.5M 12T \/ 1 PCS","offer_id":52442790428946,"sku":"Adaah058107x1","price":15.72,"currency_code":"USD","in_stock":true},{"title":"2.5M 13T \/ 1 PCS","offer_id":52442790461714,"sku":"Adaah058108x1","price":17.64,"currency_code":"USD","in_stock":true},{"title":"2.5M 14T \/ 1 PCS","offer_id":52442790494482,"sku":"Adaah058109x1","price":15.22,"currency_code":"USD","in_stock":true},{"title":"2.5M 15T \/ 1 PCS","offer_id":52442790527250,"sku":"Adaah058110x1","price":25.88,"currency_code":"USD","in_stock":true},{"title":"2.5M 16T \/ 1 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