{"product_id":"module-4m-flat-spur-gear-10t-38t-with-screw","title":"Module 4M Flat Gear Motor Transmission Spur Gear 10T to 38T  Gears With Screw","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 4M Spur Gears — Precision Flat Gear for Motor Transmission Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen your motor drive project demands repeatable torque transfer without backlash surprises, finding a correctly pitched flat spur gear in the right tooth count is the first obstacle. Hobbyists, robotics builders, and small-machine designers working with Module 4M (4 mm\/tooth pitch) drive trains need gears that mesh cleanly and mount securely — this listing covers the full 10T-to-38T range so you can spec the exact reduction ratio your build requires.\u003c\/p\u003e\n    \u003cp\u003eEach Module 4M flat spur gear is machined from engineering-grade metal (typically steel or aluminum alloy, confirm via variant detail), featuring a standard 4M tooth profile. Bore diameter and keyway dimensions vary by tooth count; overall gear outer diameter scales from approximately 48 mm (≈1.89 in) at 10T up to approximately 160 mm (≈6.30 in) at 38T. A mounting screw is included with each unit for shaft retention.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor gearbox reduction stages for CNC router axis drives, servo-driven robotic arm joints requiring a specific gear ratio, and custom conveyor or actuator builds where a Module 4M spur gear pair delivers the target RPM-to-torque conversion. Long-tail applications: \"4M spur gear 20 tooth motor mount\", \"module 4 flat gear transmission DIY robot\", \"4M gear with set screw shaft coupling\".\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 standard Module 4M (Mod 4) spur or helical gear of matching pitch. Verify bore diameter against your motor shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 4M Flat Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eFull 10T–38T Range in One Listing\u003c\/strong\u003e\n        \u003cp\u003eSelect from 29 tooth-count variants (10T through 38T) to dial in your exact gear ratio without sourcing from multiple suppliers.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eMounting Screw Included\u003c\/strong\u003e\n        \u003cp\u003eEach gear ships with a set screw for positive shaft retention, reducing assembly steps and preventing axial slippage under load.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n        \u003cstrong\u003eStandard Module 4M Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eConforms to the international Module 4 (4 mm\/tooth) standard, ensuring direct mesh compatibility with any Mod 4 mating gear in your drive train.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003eFlat Gear Form Factor\u003c\/strong\u003e\n        \u003cp\u003eLow-profile flat spur design keeps axial stack height minimal — ideal for space-constrained motor bays and compact gearbox housings.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eSmooth, Low-Noise Transmission\u003c\/strong\u003e\n        \u003cp\u003ePrecision-cut tooth flanks deliver consistent pitch engagement, reducing vibration and audible noise in continuous-duty motor drive applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\n        \u003cp\u003eSuited for CNC machines, robotic joints, conveyor actuators, and custom DIY drive systems — anywhere a reliable Module 4M spur gear transmission is needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 4M Flat Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e4M (4 mm per tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e10T – 38T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter\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\u003eGear Width (Face Width)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\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\u003eMounting Hardware\u003c\/th\u003e\n\u003ctd\u003eSet screw included\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc per order (default)\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      \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 gear reduction?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide your motor output RPM by your desired output RPM to get the gear ratio. For example, a 3:1 reduction pairs a 10T drive gear with a 30T driven gear. Browse the 10T–38T variants in this listing to find the driven or drive gear that matches your target ratio.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Module 4 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear conforming to the international Module 4 (Mod 4) standard with a matching 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat material are these spur gears made from?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMaterial varies by variant. Common options for Module 4M gears in this class include carbon steel and aluminum alloy. Please check the variant detail or contact us to confirm the exact material for your selected tooth count.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCorrosion resistance depends on the material and finish of the specific variant. Steel variants may benefit from additional lubrication or protective coating in humid environments. Aluminum variants offer inherently better corrosion resistance. Contact us to confirm the finish for your chosen tooth count.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat shaft diameter does the bore fit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter scales with tooth count and outer diameter. Because this listing covers 10T through 38T, bore sizes vary across variants. Please refer to the variant specifications or contact us with your shaft diameter before purchasing to ensure a correct fit.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow much torque can a Module 4M spur gear handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTorque capacity depends on material, face width, and operating speed. Module 4M gears in steel are typically rated for moderate-to-high torque hobby and light industrial applications. For precise load ratings, consult the variant specifications or contact us with your application details.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs the set screw compatible with standard hex keys?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The included set screw uses a standard metric hex (Allen) socket drive. A common M3 or M4 hex key (depending on the screw size for your variant) is all that is needed for installation and removal.\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 NO. of Teeth above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"4M 10T \/ 1","offer_id":52441779274002,"sku":"DGYNYGLBZSJ058241x1","price":23.6,"currency_code":"USD","in_stock":true},{"title":"4M 11T \/ 1","offer_id":52441779306770,"sku":"DGYNYGLBZSJ058242x1","price":25.09,"currency_code":"USD","in_stock":true},{"title":"4M 12T \/ 1","offer_id":52441779339538,"sku":"DGYNYGLBZSJ058243x1","price":29.63,"currency_code":"USD","in_stock":true},{"title":"4M 13T \/ 1","offer_id":52441779372306,"sku":"DGYNYGLBZSJ058244x1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"4M 14T \/ 1","offer_id":52441779405074,"sku":"DGYNYGLBZSJ058245x1","price":45.95,"currency_code":"USD","in_stock":true},{"title":"4M 15T \/ 1","offer_id":52441779437842,"sku":"DGYNYGLBZSJ058246x1","price":47.99,"currency_code":"USD","in_stock":true},{"title":"4M 16T \/ 1","offer_id":52441779470610,"sku":"DGYNYGLBZSJ058247x1","price":53.57,"currency_code":"USD","in_stock":true},{"title":"4M 17T \/ 1","offer_id":52441779503378,"sku":"DGYNYGLBZSJ058248x1","price":57.65,"currency_code":"USD","in_stock":true},{"title":"4M 18T \/ 1","offer_id":52441779536146,"sku":"DGYNYGLBZSJ058249x1","price":72.88,"currency_code":"USD","in_stock":true},{"title":"4M 19T \/ 1","offer_id":52441779568914,"sku":"DGYNYGLBZSJ058250x1","price":77.51,"currency_code":"USD","in_stock":true},{"title":"4M 20T \/ 1","offer_id":52441779601682,"sku":"DGYNYGLBZSJ058251x1","price":78.05,"currency_code":"USD","in_stock":true},{"title":"4M 21T \/ 1","offer_id":52441779634450,"sku":"DGYNYGLBZSJ058252x1","price":93.83,"currency_code":"USD","in_stock":true},{"title":"4M 22T \/ 1","offer_id":52441779667218,"sku":"DGYNYGLBZSJ058253x1","price":99.89,"currency_code":"USD","in_stock":true},{"title":"4M 23T \/ 1","offer_id":52441779699986,"sku":"DGYNYGLBZSJ058254x1","price":103.75,"currency_code":"USD","in_stock":true},{"title":"4M 24T \/ 1","offer_id":52441779732754,"sku":"DGYNYGLBZSJ058255x1","price":107.97,"currency_code":"USD","in_stock":true},{"title":"4M 25T \/ 1","offer_id":52441779765522,"sku":"DGYNYGLBZSJ058256x1","price":140.07,"currency_code":"USD","in_stock":true},{"title":"4M 26T \/ 1","offer_id":52441779798290,"sku":"DGYNYGLBZSJ058257x1","price":150.21,"currency_code":"USD","in_stock":true},{"title":"4M 27T \/ 1","offer_id":52441779831058,"sku":"DGYNYGLBZSJ058258x1","price":162.91,"currency_code":"USD","in_stock":true},{"title":"4M 28T \/ 1","offer_id":52441779863826,"sku":"DGYNYGLBZSJ058259x1","price":172.57,"currency_code":"USD","in_stock":true},{"title":"4M 29T \/ 1","offer_id":52441779896594,"sku":"DGYNYGLBZSJ058260x1","price":185.35,"currency_code":"USD","in_stock":true},{"title":"4M 31T \/ 1","offer_id":52441779929362,"sku":"DGYNYGLBZSJ058261x1","price":204.75,"currency_code":"USD","in_stock":true},{"title":"4M 30T \/ 1","offer_id":52441779962130,"sku":"DGYNYGLBZSJ058262x1","price":196.51,"currency_code":"USD","in_stock":true},{"title":"4M 32T \/ 1","offer_id":52441779994898,"sku":"DGYNYGLBZSJ058263x1","price":223.98,"currency_code":"USD","in_stock":true},{"title":"4M 33T \/ 1","offer_id":52441780027666,"sku":"DGYNYGLBZSJ058264x1","price":225.01,"currency_code":"USD","in_stock":true},{"title":"4M 34T \/ 1","offer_id":52441780060434,"sku":"DGYNYGLBZSJ058265x1","price":243.51,"currency_code":"USD","in_stock":true},{"title":"4M 35T \/ 1","offer_id":52441780093202,"sku":"DGYNYGLBZSJ058266x1","price":258.79,"currency_code":"USD","in_stock":true},{"title":"4M 36T \/ 1","offer_id":52441780125970,"sku":"DGYNYGLBZSJ058267x1","price":275.74,"currency_code":"USD","in_stock":true},{"title":"4M 37T \/ 1","offer_id":52441780158738,"sku":"DGYNYGLBZSJ058268x1","price":292.47,"currency_code":"USD","in_stock":true},{"title":"4M 38T \/ 1","offer_id":52441780191506,"sku":"DGYNYGLBZSJ058269x1","price":301.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of7_833a6bcc-0bd5-4440-ae9d-8df0b6e29d60.jpg?v=1783578788","url":"https:\/\/homediyer.com\/products\/module-4m-flat-spur-gear-10t-38t-with-screw","provider":"HomeDIYer","version":"1.0","type":"link"}