{"product_id":"module-5-spur-gear-c45-steel-motor-pinion-cogwheel-hardened","title":"Module 5 Spur Gear C45 Steel 12 to 40 Tooth Motor Pinion Cogwheel Hardened Flat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 5 Spur Gear C45 Steel — Precision Hardened Cogwheel for Motor Pinion Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear brings your drive system to a halt, every hour of downtime costs you. Engineers, robotics builders, and machine designers who need a reliable, drop-in Module 5 spur gear know that tooth count and material integrity are non-negotiable. These Module 5 spur gears are engineered for demanding power-transmission applications where dimensional accuracy and surface hardness directly affect system longevity.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from C45 medium-carbon steel and subjected to a hardening process that raises surface durability while retaining a tough core. The flat-face cogwheel profile follows standard Module 5 geometry, with a tooth pitch of 5 mm (0.197 in) and available tooth counts from 12 to 35 — corresponding to pitch circle diameters ranging from approximately 60 mm (2.36 in) to 175 mm (6.89 in). 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 CNC router spindle drives requiring a module 5 motor pinion gear replacement, robotic arm joint actuators where a hardened steel spur gear reduces backlash, and industrial conveyor or gearbox assemblies that demand a C45 steel cogwheel with consistent tooth profile across production runs.\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 Module 5 (Mod 5) gear systems. Meshes with any standard Module 5 mating gear or rack. Verify 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 Module 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\u003eC45 Medium-Carbon Steel Construction\u003c\/strong\u003e — Machined from C45 steel for a balance of machinability and tensile strength, suitable for moderate-to-heavy load transmission without deformation under cyclic stress.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eSurface-Hardened Tooth Profile\u003c\/strong\u003e — Hardening treatment increases tooth surface hardness to reduce wear at the contact zone, extending service intervals in continuous-duty drive applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStandard Module 5 Geometry\u003c\/strong\u003e — Tooth pitch of 5 mm conforms to ISO\/DIN Module 5 standards, ensuring interchangeability with any compliant mating gear, rack, or pinion in your drivetrain.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range (12–35 Teeth)\u003c\/strong\u003e — Select the exact tooth count for your required gear ratio. Pitch circle diameter scales linearly with tooth count, giving you precise ratio control without custom machining.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eFlat-Face Cogwheel Profile\u003c\/strong\u003e — The flat hub face simplifies axial positioning on shafts and allows direct coupling to motor pinions in compact drive assemblies where space is constrained.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suited for CNC machines, robotic joints, conveyor drives, 3D printer extruder upgrades, and general-purpose gearbox assemblies requiring a reliable module 5 pinion cogwheel.\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 5 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12 – 35 teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (60 mm – 175 mm \/ 2.36 in – 6.89 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003e5 mm (0.197 in)\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\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\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Flat Face)\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 Width \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 pc per unit\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 when paired with a mating gear. Divide the driven gear tooth count by the driving gear tooth count to get the ratio. For example, pairing a 12-tooth pinion with a 36-tooth gear gives a 3:1 reduction. Select the tooth count that achieves your target output speed and torque based on your motor's RPM and the load requirements of your machine.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is Module 5 and will this gear mesh with my existing drivetrain?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the standardized unit of gear tooth size used in metric gear systems. Module 5 means the pitch circle diameter equals 5 mm × tooth count. These gears will mesh correctly with any other Module 5 spur gear, rack, or pinion that follows ISO\/DIN standards. They are not compatible with Module 4, Module 6, or imperial diametral pitch gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow hard are the teeth after the hardening treatment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 steel spur gears with surface hardening typically achieve a surface hardness in the range of 45–55 HRC at the tooth contact zone, while the core remains at a lower hardness (approximately 20–30 HRC) to retain toughness and resist shock loads. Exact hardness values depend on the specific heat treatment batch; contact us to confirm if your application has a strict hardness requirement.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eC45 carbon steel is not inherently corrosion-resistant. For outdoor, humid, or washdown environments, we recommend applying a compatible gear lubricant or grease to the tooth surfaces and housing the gear in a sealed enclosure. If your application requires corrosion resistance, consider stainless steel or nylon gear alternatives, or apply a protective coating after installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter and keyway size does each variant have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter and keyway dimensions vary by tooth count and are listed in the variant options on this page. Please select your tooth count variant and review the detailed dimension drawing before ordering. If you need a custom bore size, the C45 steel material is machinable and can be bored out by a local machine shop to your required shaft diameter.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear as a direct motor pinion on a servo or stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The flat-face hub design is well-suited for direct mounting on motor output shafts. Verify that your motor shaft diameter matches the bore of the selected variant, and use a set screw or key (if a keyway is present) to secure the gear axially. For high-speed servo applications, confirm that the gear's pitch circle velocity does not exceed the rated surface speed for the lubrication method you are using.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I determine which tooth count gives me the pitch circle diameter I need?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor Module 5 gears, the pitch circle diameter (PCD) is calculated as: PCD = Module × Tooth Count = 5 × Z (mm). For example, a 20-tooth gear has a PCD of 100 mm (3.94 in), and a 30-tooth gear has a PCD of 150 mm (5.91 in). Use this formula to match center distances in your gearbox layout before selecting your variant.\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) and quantity 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 when paired with a mating gear. Divide the driven gear tooth count by the driving gear tooth count to get the ratio. For example, pairing a 12-tooth pinion with a 36-tooth gear gives a 3:1 reduction. Select the tooth count that achieves your target output speed and torque based on your motor's RPM and the load requirements of your machine.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is Module 5 and will this gear mesh with my existing drivetrain?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module (Mod) is the standardized unit of gear tooth size used in metric gear systems. Module 5 means the pitch circle diameter equals 5 mm × tooth count. These gears will mesh correctly with any other Module 5 spur gear, rack, or pinion that follows ISO\/DIN standards. They are not compatible with Module 4, Module 6, or imperial diametral pitch gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How hard are the teeth after the hardening treatment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel spur gears with surface hardening typically achieve a surface hardness in the range of 45–55 HRC at the tooth contact zone, while the core remains at approximately 20–30 HRC to retain toughness. Contact us to confirm if your application has a strict hardness requirement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a compatible gear lubricant and house the gear in a sealed enclosure. Consider stainless steel or nylon alternatives if corrosion resistance is a primary requirement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter and keyway size does each variant have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter and keyway dimensions vary by tooth count and are listed in the variant options on this page. The C45 steel material is machinable and can be bored out to a custom shaft diameter by a local machine shop if needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear as a direct motor pinion on a servo or stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The flat-face hub design is well-suited for direct mounting on motor output shafts. Verify that your motor shaft diameter matches the bore of the selected variant, and use a set screw or key to secure the gear axially.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I determine which tooth count gives me the pitch circle diameter I need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For Module 5 gears, PCD = 5 × Tooth Count (mm). A 20-tooth gear has a PCD of 100 mm (3.94 in); a 30-tooth gear has a PCD of 150 mm (5.91 in). Use this formula to match center distances in your gearbox layout.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Module 5【12 Tooth】 \/ 1 pcs","offer_id":52442743996690,"sku":"PENGJGJXCD1383x1","price":161.91,"currency_code":"USD","in_stock":true},{"title":"Module 5【13 Tooth】 \/ 1 pcs","offer_id":52442744029458,"sku":"PENGJGJXCD1384x1","price":175.1,"currency_code":"USD","in_stock":true},{"title":"Module 5【14 Tooth】 \/ 1 pcs","offer_id":52442744062226,"sku":"PENGJGJXCD1385x1","price":189.03,"currency_code":"USD","in_stock":true},{"title":"Module 5【15 Tooth】 \/ 1 pcs","offer_id":52442744094994,"sku":"PENGJGJXCD1386x1","price":213.32,"currency_code":"USD","in_stock":true},{"title":"Module 5【16 Tooth】 \/ 1 pcs","offer_id":52442744127762,"sku":"PENGJGJXCD1387x1","price":239.07,"currency_code":"USD","in_stock":true},{"title":"Module 5【17 Tooth】 \/ 1 pcs","offer_id":52442744160530,"sku":"PENGJGJXCD1388x1","price":272.94,"currency_code":"USD","in_stock":true},{"title":"Module 5【18 Tooth】 \/ 1 pcs","offer_id":52442744193298,"sku":"PENGJGJXCD1389x1","price":298.72,"currency_code":"USD","in_stock":true},{"title":"Module 5【19 Tooth】 \/ 1 pcs","offer_id":52442744226066,"sku":"PENGJGJXCD1390x1","price":325.11,"currency_code":"USD","in_stock":true},{"title":"Module 5【20 Tooth】 \/ 1 pcs","offer_id":52442744258834,"sku":"PENGJGJXCD1391x1","price":361.2,"currency_code":"USD","in_stock":true},{"title":"Module 5【21 Tooth】 \/ 1 pcs","offer_id":52442744291602,"sku":"PENGJGJXCD1392x1","price":396.56,"currency_code":"USD","in_stock":true},{"title":"Module 5【22 Tooth】 \/ 1 pcs","offer_id":52442744324370,"sku":"PENGJGJXCD1393x1","price":422.27,"currency_code":"USD","in_stock":true},{"title":"Module 5【23 Tooth】 \/ 1 pcs","offer_id":52442744357138,"sku":"PENGJGJXCD1394x1","price":459.75,"currency_code":"USD","in_stock":true},{"title":"Module 5【24 Tooth】 \/ 1 pcs","offer_id":52442744389906,"sku":"PENGJGJXCD1395x1","price":495.84,"currency_code":"USD","in_stock":true},{"title":"Module 5【25 Tooth】 \/ 1 pcs","offer_id":52442744422674,"sku":"PENGJGJXCD1396x1","price":532.64,"currency_code":"USD","in_stock":true},{"title":"Module 5【26 Tooth】 \/ 1 pcs","offer_id":52442744455442,"sku":"PENGJGJXCD1397x1","price":579.75,"currency_code":"USD","in_stock":true},{"title":"Module 5【27 Tooth】 \/ 1 pcs","offer_id":52442744488210,"sku":"PENGJGJXCD1398x1","price":616.56,"currency_code":"USD","in_stock":true},{"title":"Module 5【28 Tooth】 \/ 1 pcs","offer_id":52442744520978,"sku":"PENGJGJXCD1399x1","price":665.11,"currency_code":"USD","in_stock":true},{"title":"Module 5【29 Tooth】 \/ 1 pcs","offer_id":52442744553746,"sku":"PENGJGJXCD1400x1","price":703.32,"currency_code":"USD","in_stock":true},{"title":"Module 5【30 Tooth】 \/ 1 pcs","offer_id":52442744586514,"sku":"PENGJGJXCD1401x1","price":753.29,"currency_code":"USD","in_stock":true},{"title":"Module 5【32 Tooth】 \/ 1 pcs","offer_id":52442744619282,"sku":"PENGJGJXCD1403x1","price":853.33,"currency_code":"USD","in_stock":true},{"title":"Module 5【33 Tooth】 \/ 1 pcs","offer_id":52442744652050,"sku":"PENGJGJXCD1404x1","price":901.94,"currency_code":"USD","in_stock":true},{"title":"Module 5【34 Tooth】 \/ 1 pcs","offer_id":52442744684818,"sku":"PENGJGJXCD1405x1","price":951.93,"currency_code":"USD","in_stock":true},{"title":"Module 5【35 Tooth】 \/ 1 pcs","offer_id":52442744717586,"sku":"PENGJGJXCD1406x1","price":1013.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-04_37aac153-393b-4fb1-9cad-a1b0ac151bb5.jpg?v=1783589886","url":"https:\/\/homediyer.com\/products\/module-5-spur-gear-c45-steel-motor-pinion-cogwheel-hardened","provider":"HomeDIYer","version":"1.0","type":"link"}