{"product_id":"spur-gear-c45-steel-black-oxided-module-2-pinion-12-30-tooth-keyway-10-32mm-flat","title":"Spur Gear C45 Steel Black Oxided Module 2 Pinion 12-30 Tooth Keyway 10-32mm Flat","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eC45 Steel Black Oxided Module 2 Spur Gear — Precision Pinion for CNC, Robotics \u0026amp; Industrial Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a mismatched or undersized gear causes slippage, noise, or premature failure in your motion-control build, the root cause is almost always a compromise on material or dimensional accuracy. Engineers, CNC builders, and automation integrators who need a reliable, drop-in Module 2 spur gear with a keyed bore will find this C45 steel pinion engineered to hold up under real load cycles without play or wobble.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from C45 medium-carbon steel and finished with a black oxide coating that reduces surface friction and provides baseline corrosion resistance. The tooth count spans 12 to 30 teeth, and bore diameters range from 10 mm (0.39 in) to 32 mm (1.26 in) with matching keyways from 4 mm to 10 mm wide — allowing direct shaft coupling without set-screw slippage. Overall gear outer diameter scales proportionally with tooth count, typically from approximately 28 mm (1.10 in) for a 12T up to approximately 64 mm (2.52 in) for a 30T at Module 2 geometry.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include CNC router Z-axis and rack-and-pinion drives, conveyor and indexing table geartrains, robotic arm joint actuators, and light industrial automation where a keyed Module 2 pinion is the standard interface. Long-tail search terms this product addresses: \"module 2 spur gear with keyway,\" \"C45 steel pinion gear 12 tooth to 30 tooth,\" and \"black oxide gear bore 10mm to 32mm.\"\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 Module 2 (M2) gear systems only. Mates with M2 racks, pinions, and gearboxes. Verify bore diameter and keyway dimensions match your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 2 C45 Steel Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eC45 Medium-Carbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eMachined from C45 steel for a balance of machinability, tensile strength (typically 580–700 MPa), and wear resistance — suitable for continuous-duty drive applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🖤\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eBlack Oxide Surface Finish\u003c\/strong\u003e\n      \u003cp\u003eThe black oxide treatment reduces light reflection, lowers surface friction against mating gears, and provides a baseline layer of corrosion inhibition in dry or lightly oiled environments.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eModule 2 Precision Tooth Profile\u003c\/strong\u003e\n      \u003cp\u003eCut to Module 2 (M2) standard with a 20° pressure angle, ensuring smooth meshing and interchangeability with any M2-rated rack or mating gear in your drivetrain.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eKeyed Bore for Positive Shaft Lock\u003c\/strong\u003e\n      \u003cp\u003eEach variant includes a precision-cut keyway (4 mm, 5 mm, 6 mm, 8 mm, or 10 mm wide depending on bore size) that eliminates rotational slip under torque — no reliance on set screws alone.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eWide Bore Range: 10 mm to 32 mm\u003c\/strong\u003e\n      \u003cp\u003eAvailable bore diameters from 10 mm (0.39 in) to 32 mm (1.26 in) cover the most common shaft sizes used in servo motors, stepper motors, and gearbox output shafts in CNC and automation builds.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003e12 to 30 Tooth Count Selection\u003c\/strong\u003e\n      \u003cp\u003eChoose from 12T through 30T to dial in your gear ratio. Pair with a larger driven gear or M2 rack to achieve the speed-to-torque tradeoff your application requires.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 2 Spur Gear Pinion\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\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2 (M2)\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\u003c\/th\u003e\n\u003ctd\u003e12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e10 mm – 32 mm (0.39 in – 1.26 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width Range\u003c\/th\u003e\n\u003ctd\u003e4 mm, 5 mm, 6 mm, 8 mm, 10 mm (varies by bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e28 mm (12T) – 64 mm (30T) at M2 geometry\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\u003eFlat (no extended hub)\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        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pcs (default); multi-pack options available\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\n        \u003cp\u003eTooth count determines your gear ratio when paired with a mating gear or rack. A lower tooth count (e.g., 12T) on the drive pinion produces more torque multiplication but lower output speed; a higher tooth count (e.g., 30T) gives a closer-to-1:1 ratio. Calculate your required ratio by dividing the driven gear's tooth count by the pinion's tooth count. For rack-and-pinion linear drives, the linear travel per revolution equals π × Module × Tooth Count (in mm).\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I select the correct bore diameter and keyway size?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure your motor or gearbox output shaft diameter precisely with a caliper. Select the bore that matches your shaft — the bore must not be larger than the shaft OD. The keyway width is fixed per bore size (e.g., 10–12 mm bore uses a 4 mm keyway; 14–17 mm bore uses a 5 mm keyway; 18–20 mm bore uses a 6 mm keyway; 22–25 mm bore uses an 8 mm keyway; 28–32 mm bore uses an 8–10 mm keyway). Confirm your shaft has a matching keyway slot cut to the same width and depth.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load capacity and strength of C45 steel at Module 2?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eC45 steel has a typical tensile strength of 580–700 MPa and yield strength of approximately 305–450 MPa in the normalized condition. For Module 2 gears, the allowable tangential tooth load depends on face width, tooth count, and operating speed. These gears are suited for light-to-medium duty drives (e.g., CNC routers, indexing tables, robotic joints) operating at moderate speeds. For heavy shock loads or continuous high-torque applications, consider heat-treated or alloy steel alternatives.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the black oxide coating provide corrosion resistance?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eBlack oxide provides a thin magnetite layer that offers mild corrosion inhibition in dry or lightly oiled indoor environments. It is not a substitute for zinc plating or stainless steel in humid, wet, or chemically aggressive environments. For best results, apply a light machine oil or grease to the gear teeth and bore after installation to extend service life and maintain the coating's protective properties.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Module 2 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — any Module 2 gear or rack with a 20° pressure angle will mesh correctly with this pinion. Module (M) is a standardized metric tooth size parameter; M2 gears are interchangeable regardless of manufacturer as long as the module and pressure angle match. Do not attempt to mesh M2 gears with Module 1, Module 1.5, Module 2.5, or any other module, as tooth profiles are incompatible and will cause rapid wear or binding.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear without a key — just press-fit or with a set screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe keyway is designed for use with a standard parallel key (not included) to transmit torque reliably. While a set screw can be added through the hub if your application allows drilling, relying solely on a press fit or set screw on a keyed bore is not recommended for reversing or high-torque loads, as it may cause fretting or shaft damage over time. Always use a properly fitted key for positive torque transmission.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the face width of these gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFace width varies by tooth count and bore configuration. Please refer to the variant detail page or contact us to confirm the face width for your specific model before ordering, especially if you are matching an existing gear in a constrained space.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your tooth count and bore diameter 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\": \"Tooth count determines your gear ratio when paired with a mating gear or rack. A lower tooth count (e.g., 12T) on the drive pinion produces more torque multiplication but lower output speed; a higher tooth count (e.g., 30T) gives a closer-to-1:1 ratio. For rack-and-pinion linear drives, linear travel per revolution equals π × Module × Tooth Count (in mm).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I select the correct bore diameter and keyway size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper and select the matching bore. Keyway width is fixed per bore size: 10–12 mm bore uses 4 mm keyway; 14–17 mm uses 5 mm; 18–20 mm uses 6 mm; 22–25 mm uses 8 mm; 28–32 mm uses 8–10 mm. Confirm your shaft has a matching keyway slot.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity and strength of C45 steel at Module 2?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C45 steel has a typical tensile strength of 580–700 MPa. These gears are suited for light-to-medium duty drives such as CNC routers, indexing tables, and robotic joints at moderate speeds.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the black oxide coating provide corrosion resistance?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides mild corrosion inhibition in dry or lightly oiled indoor environments. Apply a light machine oil or grease after installation for best results. It is not suitable for wet or chemically aggressive environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 2 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any Module 2 gear or rack with a 20° pressure angle will mesh correctly. Do not attempt to mesh with other modules (M1, M1.5, M2.5, etc.) as tooth profiles are incompatible.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear without a key?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Always use a properly fitted parallel key for positive torque transmission. Relying solely on a press fit or set screw on a keyed bore is not recommended for reversing or high-torque loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the face width of these gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Face width varies by tooth count and bore configuration. Contact us to confirm the face width for your specific model before ordering.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"12 Tooth【Bore 10mm + 4mm Keyway】 \/ 1 pcs","offer_id":52442472284434,"sku":"PENGJGJXCD3320x1","price":4.75,"currency_code":"USD","in_stock":true},{"title":"13 Tooth【Bore 10mm + 4mm Keyway】 \/ 1 pcs","offer_id":52442472317202,"sku":"PENGJGJXCD3321x1","price":5.83,"currency_code":"USD","in_stock":true},{"title":"13 Tooth【Bore 12mm + 4mm Keyway】 \/ 1 pcs","offer_id":52442472349970,"sku":"PENGJGJXCD3322x1","price":5.64,"currency_code":"USD","in_stock":true},{"title":"14 Tooth【Bore 10mm + 4mm Keyway】 \/ 1 pcs","offer_id":52442472382738,"sku":"PENGJGJXCD3323x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"14 Tooth【Bore 12mm + 4mm Keyway】 \/ 1 pcs","offer_id":52442472415506,"sku":"PENGJGJXCD3324x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"14 Tooth【Bore 14mm + 5mm Keyway】 \/ 1 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