{"product_id":"spur-gear-45-steel-1-2-module-12-160-teeth-pinion-motor-gear","title":"Spur Gear 45# Steel Transmission Gear 1\/2 Module 12-160 Teeth Pinion Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpur Gear 45# Steel Transmission Gear — Reliable Power Transfer for Every Drive System\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped plastic gear or an undersized pinion brings your project to a halt, you need a drop-in replacement that won't let you down again. Whether you're a robotics builder, a CNC hobbyist, or a mechanical engineer prototyping a new actuator, these 45# carbon steel spur gears give you the tooth count and module precision to match virtually any existing drivetrain.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel — a material known for its balanced hardness and machinability — and finished with a natural steel surface. Available in two module sizes: Module 1 (tooth pitch circle diameter typically 12–160 mm \/ 0.47–6.30 in) and Module 2 (tooth pitch circle diameter typically 24–200 mm \/ 0.94–7.87 in), with tooth counts ranging from 12 to 160 teeth across the full selection.\u003c\/p\u003e\n\u003cp\u003eThese spur gears suit a wide range of applications: small DC motor pinion drives in robotics and automation, rack-and-pinion linear motion systems for CNC routers and 3D printers, and reduction gear stages in DIY winches, conveyor drives, and power-transmission assemblies requiring a precise 20° pressure angle involute tooth profile.\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 standard metric module systems. Module 1 gears mesh with other Module 1 gears; Module 2 gears mesh with other Module 2 gears. Confirm bore diameter and keyway requirements before ordering — bore finishing may be required for shaft fitment.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Spur Gear 45# Steel Transmission Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e — Medium-carbon steel delivers a solid balance of tensile strength and wear resistance, outperforming plastic or zinc-alloy alternatives in continuous-duty applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Module \u0026amp; Tooth Count Range\u003c\/strong\u003e — Module 1 (12–160 teeth) and Module 2 (12–100 teeth) cover the most common metric gear standards, reducing the need for custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eStandard 20° Pressure Angle Involute Profile\u003c\/strong\u003e — Ensures smooth, low-noise meshing and interchangeability with other standard metric spur gears of the same module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003ePrecision-Cut Teeth\u003c\/strong\u003e — Machined tooth geometry minimises backlash and distributes load evenly across the tooth face, extending service life under cyclic loading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eVersatile Bore for Shaft Fitment\u003c\/strong\u003e — Pre-bored centre hole accommodates common shaft diameters; bore can be enlarged or keyed to suit your specific shaft size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suitable for DC motor pinion drives, rack-and-pinion CNC systems, reduction gearboxes, conveyor drives, and DIY automation projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural steel (uncoated)\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard involute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Modules\u003c\/th\u003e\n\u003ctd\u003eModule 1, Module 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12–160 teeth (Module 1); 12–100 teeth (Module 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter (Mod 1)\u003c\/th\u003e\n\u003ctd\u003e12–160 mm (0.47–6.30 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter (Mod 2)\u003c\/th\u003e\n\u003ctd\u003e24–200 mm (0.94–7.87 in)\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\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Standards\u003c\/th\u003e\n\u003ctd\u003eISO metric module system\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between Module 1 and Module 2?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module number defines the tooth size — a Module 2 gear has teeth twice as large as a Module 1 gear of the same tooth count. Choose Module 1 for compact, light-duty drives (small motors, robotics, 3D printers) and Module 2 for heavier loads requiring larger, stronger teeth (CNC routers, conveyor drives, reduction gearboxes). Always match the module of the mating gear exactly; gears of different modules will not mesh correctly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count should I select for my gear ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the number of teeth on the driven gear by the number of teeth on the driving gear to get your gear ratio. For example, a 60-tooth driven gear paired with a 20-tooth pinion gives a 3:1 reduction. Both gears must be the same module. Use our wide tooth count range (12–160 for Mod 1, 12–100 for Mod 2) to achieve ratios from approximately 1:1 up to 13:1 in a single stage.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under continuous load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has a typical tensile strength of approximately 600–800 MPa and yield strength of around 355 MPa, making it significantly stronger than cast zinc alloy or nylon gears. Actual load capacity depends on tooth count, face width, speed, and lubrication. For high-torque or high-speed applications, we recommend consulting a gear load calculation before finalising your selection.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance. For indoor or dry environments, the natural steel finish is adequate with periodic light lubrication. For outdoor, humid, or washdown environments, we recommend applying a rust-inhibiting grease or considering a surface treatment such as zinc plating or black oxide after purchase. These gears are not stainless steel.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears fit my motor shaft directly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pre-bored centre hole may or may not match your shaft diameter exactly. In many cases, the bore will need to be enlarged on a lathe or drill press to match your shaft. A keyway can also be cut for positive torque transmission. We recommend confirming the bore diameter for your chosen variant before ordering, and having a local machine shop finish the bore if needed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a Module 1 gear with a Module 2 gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. Gears of different modules have different tooth sizes and pitches and will not mesh correctly. Always pair gears of the same module. If you need to connect two shafts with different speed ratios, use a gear train where all meshing pairs share the same module throughout each stage.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication do you recommend for these spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor most applications, a medium-viscosity gear grease (NLGI Grade 1 or 2) applied to the tooth faces is sufficient. For high-speed, low-load applications, a light machine oil works well. Re-lubricate periodically based on operating hours and environmental conditions. Avoid dry running, which accelerates tooth wear significantly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Module and Tooth 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 between Module 1 and Module 2?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module number defines the tooth size. Module 1 suits compact, light-duty drives; Module 2 suits heavier loads. Always match the module of the mating gear exactly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tooth count should I select for my gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear tooth count by the driving gear tooth count to get your ratio. Both gears must be the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under continuous load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has a typical tensile strength of approximately 600–800 MPa, significantly stronger than zinc alloy or nylon gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has moderate corrosion resistance. Apply rust-inhibiting grease for humid or outdoor environments. These are not stainless steel.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears fit my motor shaft directly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The pre-bored centre hole may need enlarging to match your shaft. Confirm bore diameter for your variant and have a machine shop finish the bore if needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a Module 1 gear with a Module 2 gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Gears of different modules will not mesh correctly. Always pair gears of the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication do you recommend for these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use a medium-viscosity gear grease (NLGI Grade 1 or 2) on the tooth faces. Re-lubricate periodically and avoid dry running.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod 12 Teeth","offer_id":52442254508306,"sku":"GLFBBYWJGJXCD0217x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 13 Teeth","offer_id":52442254541074,"sku":"GLFBBYWJGJXCD0218x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 14 Teeth","offer_id":52442254573842,"sku":"GLFBBYWJGJXCD0219x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth","offer_id":52442254606610,"sku":"GLFBBYWJGJXCD0220x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 16 Teeth","offer_id":52442254639378,"sku":"GLFBBYWJGJXCD0221x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 17 Teeth","offer_id":52442254672146,"sku":"GLFBBYWJGJXCD0222x1","price":9.11,"currency_code":"USD","in_stock":true},{"title":"1 Mod 18 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