{"product_id":"mod-2-5-steel-spur-gear-pinion-gear-10-40-teeth-30-105mm-od","title":"Mod 2.5 Steel Spur Gear Pinion Gear 10-40 Teeth 30-105mm OD Motor Flat Gears","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 2.5 Steel Spur Gear — Precision Flat Pinion Gears for Motors \u0026amp; DIY Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear brings your build to a halt, finding an exact-spec replacement fast is everything. Whether you are a robotics engineer, a CNC hobbyist, or a maker building a custom drive train, these Mod 2.5 steel spur gears give you a reliable, drop-in solution across a wide tooth-count range — all in one listing.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from carbon steel, delivering solid strength and wear resistance for demanding mechanical applications. The Mod 2.5 (2.5 mm per tooth) pitch standard means consistent meshing with any other M2.5 gear in your system. Outer diameters span approximately 30 mm (1.18 in) for the 10-tooth variant up to 105 mm (4.13 in) for the 40-tooth variant, with bore dimensions varying by tooth count — see variant options for exact bore specs.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor pinion drives for robotics and automation, rack-and-pinion linear actuators in CNC router builds, and reduction gear stages in electric go-karts or conveyor systems — anywhere a durable, standard-pitch flat spur gear is required.\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 Mod 2.5 (M2.5) rack, pinion, or mating spur gear. Verify bore diameter and keyway requirements against your motor shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Mod 2.5 Steel 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\u003eCarbon Steel Construction\u003c\/strong\u003e — Machined from solid carbon steel for reliable strength and long service life in mechanical drive applications.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth-Count Range (10T–40T)\u003c\/strong\u003e — 31 variants covering 10 to 40 teeth let you dial in the exact gear ratio your project demands without custom machining.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStandard Mod 2.5 Pitch\u003c\/strong\u003e — Fully interchangeable with any M2.5 mating gear, rack, or pinion — no adapter or modification needed.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003ePrecise OD Range: 30–105 mm (1.18–4.13 in)\u003c\/strong\u003e — Consistent tooth geometry across all sizes ensures smooth, low-noise meshing at typical motor speeds.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eFlat Spur Profile\u003c\/strong\u003e — Parallel tooth alignment transmits torque efficiently along a single axis, ideal for motor output shafts and reduction stages.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eVersatile Application Fit\u003c\/strong\u003e — Suited for robotics, CNC drives, electric vehicles, conveyor systems, and general-purpose DIY mechanical builds.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Mod 2.5 Steel Spur Gear\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 40T (31 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e~30 mm – ~105 mm (1.18 in – 4.13 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Flat \/ Straight Tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003eMod 2.5 (metric)\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub \/ Keyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Use a smaller tooth count on the motor shaft for speed reduction and torque multiplication.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does Mod 2.5 mean, and will it mesh with my existing gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"Mod\" (Module) is the metric standard for gear tooth size — Mod 2.5 means each tooth occupies 2.5 mm of pitch diameter per tooth. These gears will mesh correctly with any other Mod 2.5 gear, rack, or pinion regardless of brand, as long as the pressure angle is also 20°.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears — can they handle high-torque motors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel spur gears in Mod 2.5 are well-suited for moderate-to-high torque applications at typical motor speeds. Exact load capacity depends on tooth count, shaft fit, lubrication, and operating speed. For very high-shock or continuous heavy-load environments, ensure proper lubrication and shaft alignment to maximise service life.\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\u003eCarbon steel has moderate corrosion resistance. For outdoor or humid environments, we recommend applying a light machine oil or grease coating during installation and re-lubricating periodically. If your application requires higher corrosion resistance, consider stainless steel alternatives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I confirm the bore diameter fits my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count. Please check the variant detail or contact us to confirm the bore size for your selected tooth count before ordering. Measure your motor shaft diameter with calipers to ensure a proper fit — a loose bore will cause slippage under load.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a CNC router or linear actuator build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Mod 2.5 spur gears are commonly used in CNC router Z-axis drives, rack-and-pinion linear actuators, and rotary indexing tables. Pair with a matching Mod 2.5 rack for linear motion, or with a mating spur gear for rotary reduction stages.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these gears come with a set screw or keyway?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eHub configuration (set screw, keyway, or plain bore) varies by variant. Please refer to the variant specifications or contact us to confirm the hub style for your selected tooth count before purchasing.\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 Mod x Teeth variant 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. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Use a smaller tooth count on the motor shaft for speed reduction and torque multiplication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Mod 2.5 mean, and will it mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Mod 2.5 means each tooth occupies 2.5 mm of pitch diameter per tooth. These gears mesh correctly with any other Mod 2.5 gear, rack, or pinion with a 20° pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears — can they handle high-torque motors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel spur gears in Mod 2.5 are well-suited for moderate-to-high torque applications at typical motor speeds. Ensure proper lubrication and shaft alignment to maximise service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel has moderate corrosion resistance. Apply a light machine oil or grease coating during installation and re-lubricate periodically for humid or outdoor environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the bore diameter fits my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count. Check the variant detail or contact us to confirm the bore size. Measure your motor shaft diameter with calipers to ensure a proper fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a CNC router or linear actuator build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Mod 2.5 spur gears are commonly used in CNC router Z-axis drives, rack-and-pinion linear actuators, and rotary indexing tables.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears come with a set screw or keyway?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Hub configuration varies by variant. Please refer to the variant specifications or contact us to confirm the hub style for your selected tooth count.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5M 10T","offer_id":52442400915730,"sku":"GLFBDMHGLBZSJ058105x1","price":17.75,"currency_code":"USD","in_stock":true},{"title":"2.5M 11T","offer_id":52442400948498,"sku":"GLFBDMHGLBZSJ058106x1","price":19.64,"currency_code":"USD","in_stock":true},{"title":"2.5M 12T","offer_id":52442400981266,"sku":"GLFBDMHGLBZSJ058107x1","price":24.53,"currency_code":"USD","in_stock":true},{"title":"2.5M 13T","offer_id":52442401014034,"sku":"GLFBDMHGLBZSJ058108x1","price":27.53,"currency_code":"USD","in_stock":true},{"title":"2.5M 14T","offer_id":52442401046802,"sku":"GLFBDMHGLBZSJ058109x1","price":29.91,"currency_code":"USD","in_stock":true},{"title":"2.5M 15T","offer_id":52442401079570,"sku":"GLFBDMHGLBZSJ058110x1","price":40.35,"currency_code":"USD","in_stock":true},{"title":"2.5M 16T","offer_id":52442401112338,"sku":"GLFBDMHGLBZSJ058111x1","price":35.75,"currency_code":"USD","in_stock":true},{"title":"2.5M 17T","offer_id":52442401145106,"sku":"GLFBDMHGLBZSJ058112x1","price":45.46,"currency_code":"USD","in_stock":true},{"title":"2.5M 18T","offer_id":52442401177874,"sku":"GLFBDMHGLBZSJ058113x1","price":45.46,"currency_code":"USD","in_stock":true},{"title":"2.5M 19T","offer_id":52442401210642,"sku":"GLFBDMHGLBZSJ058114x1","price":58.51,"currency_code":"USD","in_stock":true},{"title":"2.5M 20T","offer_id":52442401243410,"sku":"GLFBDMHGLBZSJ058115x1","price":61.98,"currency_code":"USD","in_stock":true},{"title":"2.5M 21T","offer_id":52442401276178,"sku":"GLFBDMHGLBZSJ058116x1","price":75.48,"currency_code":"USD","in_stock":true},{"title":"2.5M 22T","offer_id":52442401308946,"sku":"GLFBDMHGLBZSJ058117x1","price":64.41,"currency_code":"USD","in_stock":true},{"title":"2.5M 23T","offer_id":52442401341714,"sku":"GLFBDMHGLBZSJ058118x1","price":77.76,"currency_code":"USD","in_stock":true},{"title":"2.5M 24T","offer_id":52442401374482,"sku":"GLFBDMHGLBZSJ058119x1","price":86.9,"currency_code":"USD","in_stock":true},{"title":"2.5M 25T","offer_id":52442401407250,"sku":"GLFBDMHGLBZSJ058120x1","price":89.47,"currency_code":"USD","in_stock":true},{"title":"2.5M 26T","offer_id":52442401440018,"sku":"GLFBDMHGLBZSJ058121x1","price":92.79,"currency_code":"USD","in_stock":true},{"title":"2.5M 27T","offer_id":52442401472786,"sku":"GLFBDMHGLBZSJ058122x1","price":99.05,"currency_code":"USD","in_stock":true},{"title":"2.5M 28T","offer_id":52442401505554,"sku":"GLFBDMHGLBZSJ058123x1","price":102.72,"currency_code":"USD","in_stock":true},{"title":"2.5M 29T","offer_id":52442401538322,"sku":"GLFBDMHGLBZSJ058124x1","price":110.47,"currency_code":"USD","in_stock":true},{"title":"2.5M 30T","offer_id":52442401571090,"sku":"GLFBDMHGLBZSJ058125x1","price":133.33,"currency_code":"USD","in_stock":true},{"title":"2.5M 31T","offer_id":52442401603858,"sku":"GLFBDMHGLBZSJ058126x1","price":145.13,"currency_code":"USD","in_stock":true},{"title":"2.5M 32T","offer_id":52442401636626,"sku":"GLFBDMHGLBZSJ058127x1","price":162.44,"currency_code":"USD","in_stock":true},{"title":"2.5M 33T","offer_id":52442401669394,"sku":"GLFBDMHGLBZSJ058128x1","price":168.69,"currency_code":"USD","in_stock":true},{"title":"2.5M 34T","offer_id":52442401702162,"sku":"GLFBDMHGLBZSJ058129x1","price":174.58,"currency_code":"USD","in_stock":true},{"title":"2.5M 35T","offer_id":52442401734930,"sku":"GLFBDMHGLBZSJ058130x1","price":180.47,"currency_code":"USD","in_stock":true},{"title":"2.5M 36T","offer_id":52442401767698,"sku":"GLFBDMHGLBZSJ058131x1","price":182.29,"currency_code":"USD","in_stock":true},{"title":"2.5M 37T","offer_id":52442401800466,"sku":"GLFBDMHGLBZSJ058132x1","price":184.86,"currency_code":"USD","in_stock":true},{"title":"2.5M 38T","offer_id":52442401833234,"sku":"GLFBDMHGLBZSJ058133x1","price":192.98,"currency_code":"USD","in_stock":true},{"title":"2.5M 39T","offer_id":52442401866002,"sku":"GLFBDMHGLBZSJ058134x1","price":197.01,"currency_code":"USD","in_stock":true},{"title":"2.5M 40T","offer_id":52442401898770,"sku":"GLFBDMHGLBZSJ058135x1","price":206.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_50fbd348-e42c-4f41-93be-64367fcfabbb.jpg?v=1783495849","url":"https:\/\/homediyer.com\/products\/mod-2-5-steel-spur-gear-pinion-gear-10-40-teeth-30-105mm-od","provider":"HomeDIYer","version":"1.0","type":"link"}