{"product_id":"mod-2-5-spur-gear-c45-steel-12-to-100-tooth-motor-pinion-cogwheel-hardened-flat","title":"Mod 2.5 Spur Gear C45 Steel 12 to 100 Tooth Motor Pinion Cogwheel Hardened Flat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 2.5 Spur Gear C45 Steel — Precision Motor Pinion Cogwheels for Demanding Drive Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear brings your CNC router, conveyor, or robotic arm to a halt, the cost is more than downtime — it's lost confidence in your build. Engineers, makers, and maintenance professionals who need a reliable, drop-in Module 2.5 spur gear turn to this C45 steel cogwheel series for its consistent tooth geometry and hardened flat face that holds up under sustained load.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from C45 medium-carbon steel and features a hardened flat face for improved wear resistance. The module is 2.5 (metric standard), with tooth counts spanning 12 to 100 teeth. Pitch diameter ranges from approximately 30 mm (1.18 in) for the 12-tooth pinion up to 250 mm (9.84 in) for the 100-tooth gear, giving you a wide selection for matching gear ratios across shaft sizes. Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include motor pinion drives on CNC milling machines and laser cutters, reduction stages in conveyor and packaging line gearboxes, and torque-transmission assemblies in robotics and automation rigs where a standard Module 2.5 spur gear cogwheel must mesh cleanly with an existing rack or mating gear.\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 to mesh with any standard Module 2.5 (Mod 2.5) rack, pinion, or mating spur gear. Confirm 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 Mod 2.5 Spur Gear Cogwheels\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eC45 Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers a solid balance of machinability and tensile strength, suitable for moderate-to-high torque drive stages without the cost of alloy steel.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eHardened Flat Face\u003c\/strong\u003e — Surface hardening increases tooth surface hardness to resist pitting and wear under cyclic mesh loads, extending service life compared to unhardened equivalents.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eModule 2.5 Metric Standard\u003c\/strong\u003e — Conforms to the ISO\/DIN Module 2.5 tooth profile, ensuring accurate mesh with any standard Mod 2.5 rack or mating gear without custom modification.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔢\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Tooth-Count Range (12–100 Teeth)\u003c\/strong\u003e — A single product family covers pinion-to-wheel ratios from approximately 1:1 up to 1:8, reducing the need to source gears from multiple suppliers.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚖️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAvailable in 1, 2, or 5-Piece Quantities\u003c\/strong\u003e — Order a single replacement pinion or stock a set of five for a production line — quantity pricing is built into the variant matrix.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suited for CNC machines, conveyor drives, robotic joints, packaging equipment, and general industrial gearbox stages requiring a standard Module 2.5 spur gear motor pinion.\u003c\/p\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 (Metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12 to 100 teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\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 flat face\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\u003eModule × Teeth (e.g., 2.5 × 20 = 50 mm \/ 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (straight tooth)\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\u003eKeyway\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 \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 2 pcs \/ 5 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\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\u003eSelect your tooth count based on the gear ratio you need and the center distance between shafts. Divide the desired ratio by 1 to get the tooth-count ratio (e.g., a 4:1 reduction with a 12-tooth pinion requires a 48-tooth wheel). Use the formula: Center Distance = (T1 + T2) × Module \/ 2, where T1 and T2 are the tooth counts of the two meshing gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the load capacity of a Module 2.5 C45 steel spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel has a typical tensile strength of 600–800 MPa. With a hardened face, surface hardness typically reaches HRC 40–50, which significantly improves resistance to pitting and tooth wear. Actual load capacity depends on tooth count, face width, speed, and lubrication — consult a gear design standard (e.g., AGMA or ISO 6336) for precise calculations for your application.\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\u003eC45 steel is not inherently corrosion-resistant. For environments with moisture, chemicals, or outdoor exposure, we recommend applying a light machine oil or grease coating during installation and re-lubricating periodically. For highly corrosive environments, consider stainless steel or plastic gears instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Module 2.5 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as your existing rack or mating gear is also Module 2.5 with a 20° pressure angle (the most common standard), these gears will mesh correctly. Always verify the module and pressure angle of your existing components before ordering. Module 2 or Module 3 gears are not interchangeable with Module 2.5.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the bore diameter fits my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count. Please refer to the variant detail page or contact us to confirm the bore size for your selected tooth count before ordering. If a custom bore is needed, the gear can typically be re-bored by a local machine shop to your required shaft diameter.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 1 pcs, 2 pcs, and 5 pcs options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAll three quantity options ship the identical gear — only the quantity per order differs. The 2-pcs and 5-pcs options offer a lower per-unit cost and are ideal for production builds, spare-parts inventory, or projects requiring matched gear pairs. Select your preferred quantity in the Amount dropdown above.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear for a motor pinion on a stepper or servo motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The smaller tooth counts (12–20 teeth) in this series are commonly used as motor pinion gears on stepper and servo motors in CNC and robotics applications. Confirm that the bore diameter matches your motor shaft diameter and that the keyway (if present) aligns with your motor shaft keyway before installation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth count (Models) and quantity (Amount) 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\": \"Select your tooth count based on the gear ratio you need and the center distance between shafts. Divide the desired ratio by 1 to get the tooth-count ratio. Use the formula: Center Distance = (T1 + T2) × Module \/ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity of a Module 2.5 C45 steel spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel has a typical tensile strength of 600–800 MPa. With a hardened face, surface hardness typically reaches HRC 40–50. Actual load capacity depends on tooth count, face width, speed, and lubrication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel is not inherently corrosion-resistant. Apply a light machine oil or grease coating during installation and re-lubricate periodically. For highly corrosive environments, consider stainless steel or plastic gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 2.5 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, as long as your existing rack or mating gear is also Module 2.5 with a 20° pressure angle. Module 2 or Module 3 gears are not interchangeable with Module 2.5.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the bore diameter fits my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count. Please refer to the variant detail page or contact us to confirm the bore size for your selected tooth count before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 1 pcs, 2 pcs, and 5 pcs options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"All three quantity options ship the identical gear — only the quantity per order differs. The 2-pcs and 5-pcs options offer a lower per-unit cost, ideal for production builds or spare-parts inventory.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear for a motor pinion on a stepper or servo motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The smaller tooth counts (12–20 teeth) are commonly used as motor pinion gears on stepper and servo motors in CNC and robotics applications. Confirm bore diameter and keyway alignment before installation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 2.5【12 Tooth】 \/ 1 pcs","offer_id":52442741244178,"sku":"PENGJGJXCD1407x1","price":25.77,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【13 Tooth】 \/ 1 pcs","offer_id":52442741276946,"sku":"PENGJGJXCD1408x1","price":25.83,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【14 Tooth】 \/ 1 pcs","offer_id":52442741309714,"sku":"PENGJGJXCD1409x1","price":26.04,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【15 Tooth】 \/ 1 pcs","offer_id":52442741342482,"sku":"PENGJGJXCD1410x1","price":35.89,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【16 Tooth】 \/ 1 pcs","offer_id":52442741375250,"sku":"PENGJGJXCD1411x1","price":36.3,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【17 Tooth】 \/ 1 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