{"product_id":"2-5-3-4-5-mod-spur-gear-10t-to-45t-flat-gear-motor-transmission-gear-45-steel","title":"2.5\/3\/4\/5 Mod Spur Gear 10T to 45T Flat Gear Motor Transmission Gear 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2.5–5 Mod Spur Gear in 45# Steel — Precise Transmission for Motor Drives and DIY Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen a mismatched or worn gear causes backlash, noise, or premature failure in your drive train, the fix starts with selecting the right module and tooth count. Engineers, robotics builders, and DIY CNC enthusiasts who need a reliable, off-the-shelf spur gear in a range of standard metric modules will find this listing covers the most common configurations in a single place.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-to-heavy load applications. Available in four gear modules — 2.5 Mod, 3 Mod, 4 Mod, and 5 Mod — with tooth counts from 10T to 45T (or 16T for 5 Mod). Pitch diameters range from approximately 25 mm (≈0.98 in) for a 2.5 Mod 10T gear up to 225 mm (≈8.86 in) for a 5 Mod 45T gear, covering a wide span of drive ratios.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor gearbox stages in small CNC routers and laser cutters, rack-and-pinion linear actuators for 3D printer Z-axes, and rotary indexing tables in benchtop milling setups where a standard metric module gear is required for interchangeability with existing components.\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    Compatible with any mating spur gear or rack of the same module (2.5 \/ 3 \/ 4 \/ 5 Mod). Bore diameter and keyway dimensions vary by tooth count — see variant options for shaft fit details.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 45# Steel Spur Gears\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n      \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eMachined from 45# steel for a tensile strength typically in the 600–800 MPa range, providing durability under cyclic loading without the brittleness of through-hardened tool steel.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cstrong\u003eFour Standard Metric Modules\u003c\/strong\u003e\n      \u003cp\u003eAvailable in 2.5 Mod, 3 Mod, 4 Mod, and 5 Mod — the most widely used metric module sizes in hobbyist and light-industrial drive systems — ensuring direct interchangeability with standard racks and pinions.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n      \u003cstrong\u003eWide Tooth-Count Range (10T–45T)\u003c\/strong\u003e\n      \u003cp\u003eCovers gear ratios from roughly 1:4.5 down to 1:1 when paired with a 10T pinion, giving you the flexibility to dial in the torque-to-speed trade-off your application demands.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n      \u003cstrong\u003eFlat Spur Profile for Parallel-Shaft Drives\u003c\/strong\u003e\n      \u003cp\u003eStraight-tooth spur geometry delivers efficient power transfer on parallel shafts with no axial thrust load, simplifying bearing selection and housing design in compact gearboxes.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n      \u003cstrong\u003eMotor Transmission Ready\u003c\/strong\u003e\n      \u003cp\u003eBore and hub dimensions are sized for common DC motor output shafts. Suitable for direct mounting on gear motor stages, servo output shafts, and stepper motor drives in automation projects.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n      \u003cstrong\u003eMachinable for Custom Bore or Keyway\u003c\/strong\u003e\n      \u003cp\u003e45# steel machines cleanly on a lathe or mill, allowing you to open the bore, cut a keyway, or add a set-screw flat to match your exact shaft diameter without risk of cracking.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Metric Spur Gear\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (straight tooth, parallel shaft)\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\u003eAvailable Modules\u003c\/th\u003e\n\u003ctd\u003e2.5 Mod \/ 3 Mod \/ 4 Mod \/ 5 Mod\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 45T (varies by module; see 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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (Module × Tooth Count)\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eFlat \/ Plain bore (machinable)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural steel (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile Standard\u003c\/th\u003e\n\u003ctd\u003eDIN \/ ISO metric module\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 module for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module must match the mating gear or rack exactly — a 3 Mod gear will only mesh correctly with other 3 Mod components. As a rule of thumb, higher modules (larger tooth size) handle more torque but result in a larger pitch diameter for the same tooth count. If you are replacing an existing gear, measure the pitch diameter and divide by the tooth count to confirm the module before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tooth count should I select for my target gear ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the driven gear tooth count by the driving gear tooth count to get the ratio. For example, a 30T gear driven by a 10T pinion gives a 3:1 reduction. This listing covers 10T through 45T, so you can achieve ratios from approximately 1:1 up to 4.5:1 within a single module family without sourcing from multiple suppliers.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is 45# steel compared to other gear materials?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel has a typical tensile strength of 600–800 MPa in the normalized or quenched-and-tempered condition, making it significantly stronger than cast iron or nylon gears and suitable for moderate continuous loads. It is not as hard as case-hardened alloy steel (e.g., 20CrMnTi), so for very high-cycle or shock-load applications you may want to consider surface hardening after machining.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears rust or corrode in humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel is not stainless and will oxidize if left unprotected in humid or wet conditions. For indoor or enclosed gearbox use with periodic lubrication, surface rust is not typically a concern. For outdoor or high-humidity environments, apply a light grease or anti-corrosion coating, or consider specifying a stainless or zinc-plated alternative for your application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears with a rack-and-pinion linear drive?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as the rack shares the same module and pressure angle (20°). A 3 Mod spur gear from this listing will mesh directly with a standard 3 Mod steel or nylon rack, making it a straightforward choice for CNC router gantries, 3D printer Z-axis drives, and linear actuator stages.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter do these gears have, and can I modify it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and module — please refer to the variant detail or contact us to confirm the bore for your specific selection. Because the gears are machined from 45# steel, the bore can be enlarged on a lathe and a keyway or set-screw flat can be added without risk of cracking, giving you flexibility to fit a range of motor shaft diameters.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears suitable for stepper motor or servo motor drives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The flat spur profile and standard metric module sizing make these gears compatible with stepper and servo motor output shafts commonly used in CNC and robotics applications. Verify the bore diameter matches your motor shaft, or plan to machine the bore to size. The straight-tooth geometry produces no axial thrust, which simplifies motor bearing loads in direct-drive configurations.\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 Module and Number of Gear Teeth 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 module for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module must match the mating gear or rack exactly — a 3 Mod gear will only mesh correctly with other 3 Mod components. As a rule of thumb, higher modules handle more torque but result in a larger pitch diameter for the same tooth count. If you are replacing an existing gear, measure the pitch diameter and divide by the tooth count to confirm the module before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tooth count should I select for my target gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear tooth count by the driving gear tooth count to get the ratio. For example, a 30T gear driven by a 10T pinion gives a 3:1 reduction. This listing covers 10T through 45T, so you can achieve ratios from approximately 1:1 up to 4.5:1 within a single module family.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# steel compared to other gear materials?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel has a typical tensile strength of 600–800 MPa, making it significantly stronger than cast iron or nylon gears and suitable for moderate continuous loads. For very high-cycle or shock-load applications, surface hardening after machining may be considered.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears rust or corrode in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel is not stainless and will oxidize if left unprotected in humid or wet conditions. For indoor or enclosed gearbox use with periodic lubrication, surface rust is not typically a concern. Apply a light grease or anti-corrosion coating for outdoor or high-humidity environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with a rack-and-pinion linear drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as the rack shares the same module and pressure angle (20°). A 3 Mod spur gear from this listing will mesh directly with a standard 3 Mod steel or nylon rack, making it suitable for CNC router gantries, 3D printer Z-axis drives, and linear actuator stages.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter do these gears have, and can I modify it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and module. Because the gears are machined from 45# steel, the bore can be enlarged on a lathe and a keyway or set-screw flat can be added without risk of cracking, giving you flexibility to fit a range of motor shaft diameters.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears suitable for stepper motor or servo motor drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The flat spur profile and standard metric module sizing make these gears compatible with stepper and servo motor output shafts commonly used in CNC and robotics applications. The straight-tooth geometry produces no axial thrust, which simplifies motor bearing loads in direct-drive configurations.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5 Mod \/ 10T","offer_id":52443004338450,"sku":"PENG058105x1","price":4.42,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 11T","offer_id":52443004371218,"sku":"PENG058106x1","price":6.51,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 12T","offer_id":52443004403986,"sku":"PENG058107x1","price":5.83,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 13T","offer_id":52443004436754,"sku":"PENG058108x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 14T","offer_id":52443004469522,"sku":"PENG058109x1","price":7.55,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 15T","offer_id":52443004502290,"sku":"PENG058110x1","price":12.77,"currency_code":"USD","in_stock":true},{"title":"2.5 Mod \/ 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