{"product_id":"module-3-spur-gear-c45-steel-hardened-pinion-cogwheel","title":"Module 3 Spur Gear C45 Steel 12 - 120 Tooth Hardened Motor Pinion Cogwheel Flat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 Spur Gear C45 Steel — Hardened Pinion Cogwheel for Reliable Power Transmission\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or worn gear brings your build to a halt, you need a replacement that fits precisely and holds up under load. Whether you are a mechanical engineer, CNC hobbyist, or robotics builder, finding a Module 3 spur gear in the exact tooth count you need — without waiting weeks for a custom order — is a constant challenge. These Module 3 C45 steel spur gears are stocked in 12 through 120 tooth configurations so you can get the right cogwheel and keep your project moving.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from C45 medium-carbon steel and surface-hardened for improved wear resistance. The module (pitch) is 3 mm, meaning the tooth pitch diameter equals 3 × tooth count (e.g., a 20-tooth gear has a 60 mm pitch diameter \/ ~2.36 in). Bore diameter and face width vary by tooth count — see variant options for exact dimensions. The flat (no hub) profile keeps the overall axial footprint compact.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor pinion drives in conveyor systems, rack-and-pinion linear actuators for CNC router axes, and reduction gear trains in robotic arm joints — all applications where a consistent module 3 pitch is required for correct meshing with mating gears or racks.\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 3 (Mod 3) spur gear, rack, or pinion. Verify bore diameter against your shaft size before ordering — see variant options for bore specs.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eC45 Steel Construction\u003c\/strong\u003e — Machined from medium-carbon C45 steel for a solid balance of toughness and machinability, suitable for moderate-to-heavy load applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\n        \u003cstrong\u003eSurface-Hardened Teeth\u003c\/strong\u003e — Heat-treated tooth flanks resist wear and pitting, extending service life in continuous-duty drive systems.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 3 Precision Cut\u003c\/strong\u003e — Teeth are hobbed to Module 3 standard (20° pressure angle), ensuring accurate meshing with any Mod 3 mating gear or rack.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range (12–120 T)\u003c\/strong\u003e — Available from 12 tooth pinions up to 120 tooth wheels, covering a broad range of gear ratios in a single product line.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlat Profile, Compact Design\u003c\/strong\u003e — No protruding hub keeps axial length minimal, ideal for space-constrained gearboxes and motor mounts.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eDirect Motor Pinion Fit\u003c\/strong\u003e — Bore sized for common motor shaft diameters; suitable for use as a drive pinion on DC motors, stepper motors, and servo drives.\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eC45 Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eHardened (tooth flanks)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e3 mm\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 Count Range\u003c\/th\u003e\n\u003ctd\u003e12 – 120 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Tooth Count (e.g., 20T = 60 mm \/ 2.36 in)\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 (no hub)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc\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\u003eThe tooth count determines your gear ratio and pitch diameter. Divide the desired gear ratio by the number of teeth on your mating gear to find the required tooth count on this gear. For example, a 4:1 reduction with a 15-tooth pinion requires a 60-tooth wheel. Use the pitch diameter formula (Module × Teeth = PD in mm) to confirm the center distance fits your housing.\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 × tooth count. These gears will mesh correctly with any other Module 3 external spur gear or Module 3 rack, regardless of brand, as long as the pressure angle is also 20°. They are NOT compatible with Module 2, Module 4, or imperial DP (diametral pitch) gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears — what load can they handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel with surface-hardened teeth provides solid load capacity for moderate-to-heavy duty drives. Exact torque ratings depend on tooth count, face width, speed, and lubrication. For critical load calculations, apply AGMA or ISO 6336 gear strength standards using the actual face width and material hardness values. These gears are well-suited for CNC drives, conveyor systems, and robotic joints operating at typical hobby-to-light-industrial torque levels.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant? Can I use them outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel is not inherently corrosion-resistant. For outdoor or humid environments, we recommend applying a light machine oil or grease coating regularly, or considering a protective surface treatment such as zinc plating or painting after purchase. For fully corrosion-resistant applications, stainless steel or plastic gears would be a better choice.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the bore diameter and how do I fit it to my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count — please check the variant options or contact us to confirm the bore size for your selected tooth count before ordering. If the bore is slightly undersized for your shaft, it can typically be bored out or reamed to the required diameter by a machine shop. A keyway or set-screw can then be added for positive shaft retention.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear as a motor pinion directly on a DC or stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the flat profile and available small tooth counts (12–20 T) make these gears well-suited as drive pinions on DC motors, stepper motors, and servo motors. Verify that the bore diameter matches your motor shaft diameter. If needed, the bore can be machined to size. Ensure the face width aligns with your mating gear or rack for full tooth engagement.\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\u003eYes, lubrication is recommended for all steel spur gear drives. Apply a light machine oil or gear grease to the tooth flanks before initial operation. For continuous-duty applications, re-lubricate every 200–500 operating hours or whenever you notice increased noise or heat. Proper lubrication significantly extends tooth life and reduces 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 tooth count (Models) 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\": \"The tooth count determines your gear ratio and pitch diameter. Divide the desired gear ratio by the number of teeth on your mating gear to find the required tooth count on this gear. Use the pitch diameter formula (Module × Teeth = PD in mm) to confirm the center distance fits your housing.\"\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 × tooth count. These gears mesh with any Module 3 external spur gear or rack with a 20° pressure angle. They are not compatible with Module 2, Module 4, or imperial DP gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears — what load can they handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel with surface-hardened teeth provides solid load capacity for moderate-to-heavy duty drives. Exact torque ratings depend on tooth count, face width, speed, and lubrication. Apply AGMA or ISO 6336 standards for critical load calculations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant? Can I use them outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease regularly, or add a protective surface treatment such as zinc plating after purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the bore diameter and how do I fit it to my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count — check the variant options or contact us to confirm. If the bore is undersized, it can be bored out or reamed to the required diameter by a machine shop.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear as a motor pinion directly on a DC or stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — small tooth counts (12–20 T) make these gears well-suited as drive pinions on DC motors, stepper motors, and servo motors. Verify the bore diameter matches your motor shaft diameter.\"\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 light machine oil or gear grease to tooth flanks before initial operation. Re-lubricate every 200–500 operating hours or when increased noise or heat is noticed.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 3【12 Tooth】 \/ 1 pcs","offer_id":52442014286098,"sku":"PENGJGJXCD1130x1","price":32.61,"currency_code":"USD","in_stock":true},{"title":"Module 3【13 Tooth】 \/ 1 pcs","offer_id":52442014318866,"sku":"PENGJGJXCD1131x1","price":41.04,"currency_code":"USD","in_stock":true},{"title":"Module 3【14 Tooth】 \/ 1 pcs","offer_id":52442014351634,"sku":"PENGJGJXCD1132x1","price":41.59,"currency_code":"USD","in_stock":true},{"title":"Module 3【15 Tooth】 \/ 1 pcs","offer_id":52442014384402,"sku":"PENGJGJXCD1133x1","price":50.56,"currency_code":"USD","in_stock":true},{"title":"Module 3【16 Tooth】 \/ 1 pcs","offer_id":52442014417170,"sku":"PENGJGJXCD1134x1","price":50.56,"currency_code":"USD","in_stock":true},{"title":"Module 3【17 Tooth】 \/ 1 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