{"product_id":"5-modulus-spur-gears-12t-35t-45-steel-pinion-motor-gear-50mm","title":"5 Modulus 12T-35T Spur Gears pitch 15.7mm 45# Steel Pinion Motor Gear Thick 50mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003ch2\u003e5 Modulus Spur Gears — Precision 45# Steel Pinion Gears for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhen your CNC router, robotic arm, or automation drive system demands reliable torque transmission without backlash creep, undersized or poorly machined gears become the weakest link. These Module 5 spur gears are engineered for makers, machine builders, and industrial integrators who need consistent mesh accuracy across a wide tooth-count range — from compact 12-tooth pinions to larger 35-tooth drive gears.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of machinability and surface hardness suitable for moderate-to-heavy load applications. The pitch circle diameter scales with tooth count: at Module 5, pitch = 15.7 mm (0.618 in) per tooth, giving a pitch diameter range of approximately 60 mm (2.36 in) for 12T up to 175 mm (6.89 in) for 35T. Face width (tooth thickness along the shaft axis) is a uniform 50 mm (1.97 in) across all variants, providing substantial load-bearing contact area.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: DIY CNC gantry drives requiring module 5 spur gear sets for rack-and-pinion or gear-train reduction; robotic joint actuators where a pinion motor gear must mesh with a larger driven gear; and industrial conveyor or indexing systems needing a standardized modulus 5 steel gear with a 50 mm face width for high-torque, low-speed applications.\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 5 (Mod 5) standard spur gear or rack. Bore diameter varies by tooth count — confirm bore and keyway requirements before ordering. Suitable for shaft diameters typically ranging from 10 mm to 30 mm depending on variant.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Module 5 Spur Gears\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n      \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eMachined from 45# steel for a reliable combination of tensile strength and machinability, supporting moderate-to-heavy radial and tangential loads in drive train applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cstrong\u003eModule 5 Standard — 15.7 mm Pitch\u003c\/strong\u003e\n      \u003cp\u003eConforms to the international Module 5 gear standard with a circular pitch of 15.7 mm (0.618 in), ensuring direct interchangeability with any Mod 5 mating gear or rack on the market.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cstrong\u003e50 mm Uniform Face Width\u003c\/strong\u003e\n      \u003cp\u003eA consistent 50 mm (1.97 in) tooth face width across all tooth counts maximizes contact area and load distribution, reducing surface stress in high-torque applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\n      \u003cstrong\u003eWide Tooth Count Range: 12T to 35T\u003c\/strong\u003e\n      \u003cp\u003eTwenty-four tooth-count options from 12 to 35 teeth let you dial in the exact gear ratio needed for your CNC, robotics, or automation drive without custom machining.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n      \u003cstrong\u003ePinion Motor Gear Ready\u003c\/strong\u003e\n      \u003cp\u003eBore and hub dimensions are sized for direct mounting on standard motor output shafts, making these gears a drop-in pinion solution for servo, stepper, and DC motor drives.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n      \u003cstrong\u003eStraight-Cut Spur Tooth Profile\u003c\/strong\u003e\n      \u003cp\u003eStraight spur tooth geometry delivers efficient power transfer with no axial thrust load, simplifying bearing selection and shaft alignment in parallel-axis gear trains.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Module 5 Spur Gears\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\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\u003eModule (Modulus)\u003c\/th\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCircular Pitch\u003c\/th\u003e\n\u003ctd\u003e15.7 mm (0.618 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12T – 35T (24 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e50 mm (1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e60 mm – 175 mm (2.36 in – 6.89 in)\u003c\/td\u003e\n\u003c\/tr\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Diameter\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMachined, natural steel\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\u003eSelect tooth count based on your required gear ratio. Divide the driven gear teeth by the driving (pinion) gear teeth to get the ratio. For example, pairing a 12T pinion with a 24T driven gear gives a 2:1 reduction. Smaller tooth counts (12T–16T) suit high-speed pinion applications; larger counts (25T–35T) are better as driven gears or for lower reduction ratios.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load capacity can these Module 5 steel gears handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has a tensile strength of approximately 600–800 MPa depending on heat treatment. With a 50 mm face width and Module 5 tooth size, these gears are suited for moderate-to-heavy industrial loads. Exact torque ratings depend on operating speed, lubrication, and shaft\/bore fit — consult a gear load calculator using the Lewis equation for your specific application parameters.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion resistant. For outdoor or humid environments, apply a gear lubricant or grease regularly, or consider adding a protective coating (zinc plating, black oxide, or paint) after purchase. For corrosive environments, stainless steel or nylon gears may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Module 5 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack manufactured to the Module 5 standard with a 20° pressure angle will mesh correctly with these gears. Verify that your existing components are labeled \"M5\" or \"Mod 5\" and use a 20° pressure angle (the international standard). Metric module gears are not interchangeable with imperial diametral pitch (DP) gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter does each tooth count variant have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and hub size. Please check the variant detail page or contact us to confirm the bore diameter for your specific tooth count before ordering. We recommend measuring your motor or shaft output diameter and confirming compatibility prior to purchase.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears for a CNC router rack-and-pinion drive?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 5 spur gears are a common choice for CNC rack-and-pinion gantry drives. Pair the appropriate tooth count pinion with a Module 5 steel or nylon rack. Smaller tooth counts (12T–16T) are typical for pinion-on-rack CNC drives, offering a good balance of resolution and speed. Ensure your motor shaft matches the bore diameter of the selected variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs a keyway included, and can the bore be customized?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eKeyway availability varies by variant — please contact us to confirm whether your selected tooth count includes a keyway. Custom bore machining is not offered through this listing; if you require a specific bore size or keyway dimension, consult a local machine shop for secondary machining after purchase.\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 Number and 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 tooth count based on your required gear ratio. Divide the driven gear teeth by the driving (pinion) gear teeth to get the ratio. For example, pairing a 12T pinion with a 24T driven gear gives a 2:1 reduction. Smaller tooth counts (12T–16T) suit high-speed pinion applications; larger counts (25T–35T) are better as driven gears or for lower reduction ratios.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load capacity can these Module 5 steel gears handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has a tensile strength of approximately 600–800 MPa depending on heat treatment. With a 50 mm face width and Module 5 tooth size, these gears are suited for moderate-to-heavy industrial loads. Exact torque ratings depend on operating speed, lubrication, and shaft\/bore fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion resistant. For outdoor or humid environments, apply a gear lubricant or grease regularly, or consider adding a protective coating after purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Module 5 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack manufactured to the Module 5 standard with a 20° pressure angle will mesh correctly with these gears. Metric module gears are not interchangeable with imperial diametral pitch (DP) gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter does each tooth count variant have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and hub size. Please check the variant detail page or contact us to confirm the bore diameter for your specific tooth count before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears for a CNC router rack-and-pinion drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 5 spur gears are a common choice for CNC rack-and-pinion gantry drives. Pair the appropriate tooth count pinion with a Module 5 steel or nylon rack. Smaller tooth counts (12T–16T) are typical for pinion-on-rack CNC drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is a keyway included, and can the bore be customized?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Keyway availability varies by variant — please contact us to confirm whether your selected tooth count includes a keyway. Custom bore machining is not offered through this listing.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5 Modulus 12Tooth \/ 1pcs","offer_id":52442632880402,"sku":"FXLJGJXCD1383x1","price":127.16,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 13Tooth \/ 1pcs","offer_id":52442632913170,"sku":"FXLJGJXCD1384x1","price":137.6,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 14Tooth \/ 1pcs","offer_id":52442632945938,"sku":"FXLJGJXCD1385x1","price":148.92,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 15Tooth \/ 1pcs","offer_id":52442632978706,"sku":"FXLJGJXCD1386x1","price":167.96,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 16Tooth \/ 1pcs","offer_id":52442633011474,"sku":"FXLJGJXCD1387x1","price":188.36,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 17Tooth \/ 1pcs","offer_id":52442633044242,"sku":"FXLJGJXCD1388x1","price":214.31,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 18Tooth \/ 1pcs","offer_id":52442633077010,"sku":"FXLJGJXCD1389x1","price":234.71,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 19Tooth \/ 1pcs","offer_id":52442633109778,"sku":"FXLJGJXCD1390x1","price":255.82,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 20Tooth \/ 1pcs","offer_id":52442633142546,"sku":"FXLJGJXCD1391x1","price":283.94,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 21Tooth \/ 1pcs","offer_id":52442633175314,"sku":"FXLJGJXCD1392x1","price":311.41,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 22Tooth \/ 1pcs","offer_id":52442633208082,"sku":"FXLJGJXCD1393x1","price":331.81,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 23Tooth \/ 1pcs","offer_id":52442633240850,"sku":"FXLJGJXCD1394x1","price":361.35,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 24Tooth \/ 1pcs","offer_id":52442633273618,"sku":"FXLJGJXCD1395x1","price":389.48,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 25Tooth \/ 1pcs","offer_id":52442633306386,"sku":"FXLJGJXCD1396x1","price":418.31,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 26Tooth \/ 1pcs","offer_id":52442633339154,"sku":"FXLJGJXCD1397x1","price":454.92,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 27Tooth \/ 1pcs","offer_id":52442633371922,"sku":"FXLJGJXCD1398x1","price":483.75,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 28Tooth \/ 1pcs","offer_id":52442633404690,"sku":"FXLJGJXCD1399x1","price":521.67,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 29Tooth \/ 1pcs","offer_id":52442633437458,"sku":"FXLJGJXCD1400x1","price":551.86,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 30Tooth \/ 1pcs","offer_id":52442633470226,"sku":"FXLJGJXCD1401x1","price":591.3,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 31Tooth \/ 1pcs","offer_id":52442633502994,"sku":"FXLJGJXCD1402x1","price":629.92,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 32Tooth \/ 1pcs","offer_id":52442633535762,"sku":"FXLJGJXCD1403x1","price":670.07,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 33Tooth \/ 1pcs","offer_id":52442633568530,"sku":"FXLJGJXCD1404x1","price":707.99,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 34Tooth \/ 1pcs","offer_id":52442633601298,"sku":"FXLJGJXCD1405x1","price":747.43,"currency_code":"USD","in_stock":true},{"title":"5 Modulus 35Tooth \/ 1pcs","offer_id":52442633634066,"sku":"FXLJGJXCD1406x1","price":796.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_7ceeed37-839d-431b-a1d5-da59e5581bb3.jpg?v=1783572088","url":"https:\/\/homediyer.com\/products\/5-modulus-spur-gears-12t-35t-45-steel-pinion-motor-gear-50mm","provider":"HomeDIYer","version":"1.0","type":"link"}