{"product_id":"4-modul-steel-spur-gears-pinion-gear-thick-35mm-10-40-teeth-for-3d-cnc","title":"4 Modul Steel Spur Gears Pinion Gear Thick 35mm 10-40 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4 Mod Steel Spur Gears — Precision Pinion Gears for CNC \u0026amp; 3D Printer Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router stalls mid-cut or your 3D printer axis skips steps, the culprit is often an undersized or poorly machined drive gear. These 4 Modul steel spur gears are engineered for makers, hobbyists, and small-workshop builders who need reliable, repeatable torque transmission without the guesswork of sourcing industrial surplus parts.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from carbon steel with a uniform face width of 35 mm (1.38 in). The module (Mod) rating of 4 defines the tooth pitch — a larger module means stronger, more robust teeth suited to moderate-to-heavy load applications. Available tooth counts range from 10 to 40 teeth, giving pitch circle diameters from approximately 40 mm (1.57 in) up to 160 mm (6.30 in). Bore diameter varies by tooth count; see variant options for exact bore specs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router Z-axis and rack-and-pinion drives, 3D printer extruder and gantry gear trains, DIY automation conveyor and indexing mechanisms, and educational robotics platforms requiring standardized metric gearing.\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 Fits standard Mod 4 metric gear systems. Pairs directly with Mod 4 racks, worm gears, and mating spur gears. Verify bore diameter against your shaft size before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 4 Mod 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\n\u003cp\u003eMachined from carbon steel for solid load-bearing capacity and resistance to deformation under sustained torque — a step up from plastic or aluminum alternatives in demanding drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003e35 mm Uniform Face Width\u003c\/strong\u003e\n\u003cp\u003eThe consistent 35 mm (1.38 in) face width across all tooth-count variants ensures even load distribution and simplifies gear-train alignment in multi-stage drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eModule 4 Standardized Pitch\u003c\/strong\u003e\n\u003cp\u003eModule 4 tooth geometry conforms to ISO metric gear standards, making these pinions directly interchangeable with any Mod 4 mating gear, rack, or gearbox on the market.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eWide Tooth-Count Selection (10–40 Teeth)\u003c\/strong\u003e\n\u003cp\u003eThirty-one variants from 10 to 40 teeth let you dial in the exact gear ratio your drive system needs — from high-speed, low-torque pinions to slower, higher-torque output gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n\u003cstrong\u003eCNC-Machined Bore \u0026amp; Hub\u003c\/strong\u003e\n\u003cp\u003eEach gear features a CNC-machined central bore and hub for accurate shaft fit. Bore diameter varies by tooth count; see variant options for the exact bore dimension of your selected model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Fit for CNC \u0026amp; 3D Printer Drives\u003c\/strong\u003e\n\u003cp\u003eDesigned to slot directly into standard Mod 4 rack-and-pinion and gear-train assemblies used in CNC routers, 3D printers, and DIY automation rigs — minimal modification required.\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 — 4 Mod Steel Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 – 40 Teeth (31 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e35 mm (1.38 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter Range\u003c\/th\u003e\n\u003ctd\u003e40 mm – 160 mm (1.57 in – 6.30 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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Module 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Gear Type\u003c\/th\u003e\n\u003ctd\u003eMod 4 Spur Gear, Rack, Worm Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eCNC Router, 3D Printer, DIY Automation, Robotics\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\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\u003eTooth count determines your gear ratio. A smaller pinion (10–15 teeth) paired with a larger mating gear gives you torque multiplication — ideal for heavy CNC axes. A larger pinion (30–40 teeth) reduces ratio and increases output speed, better suited for lighter, faster-moving assemblies. Calculate your required ratio first, then select the tooth count that achieves it with your mating gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat shaft diameter does this gear fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count variant. Please check the variant options on this page for the exact bore size of your selected model. If your shaft diameter differs, a machinist can typically re-bore the hub to your required dimension.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs carbon steel strong enough for my CNC router drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, for the majority of hobbyist and small-workshop CNC routers. Carbon steel offers a solid balance of tensile strength and machinability. For very high-cycle industrial applications or corrosive environments, consider whether a hardened or stainless variant better suits your duty cycle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel can oxidize if exposed to moisture over time. For indoor CNC and 3D printer environments, applying a light machine oil or grease to the gear teeth during operation provides adequate corrosion protection. For outdoor or high-humidity applications, consider adding a protective coating or selecting a stainless steel alternative.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with Mod 4 racks for rack-and-pinion drives?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears conform to ISO Mod 4 tooth geometry with a standard 20° pressure angle, making them directly compatible with any Mod 4 rack. This is a common configuration for CNC router X\/Y axis drives and linear motion systems.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide between a 10-tooth and a 40-tooth pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 10-tooth pinion has a pitch circle diameter of 40 mm and is best for high-reduction, high-torque drive stages where speed is less critical. A 40-tooth pinion has a pitch circle diameter of 160 mm and suits lower-reduction stages where you need more speed and less torque multiplication. Most CNC rack-and-pinion setups use pinions in the 14–20 tooth range for a balanced speed-to-torque ratio.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a 3D printer extruder or gantry?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are well-suited for 3D printer gantry and motion systems that use Mod 4 metric gearing. For direct-drive extruders, verify the bore diameter matches your motor shaft and that the tooth count aligns with your desired extrusion ratio before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth count (Model) 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. A smaller pinion (10–15 teeth) paired with a larger mating gear gives you torque multiplication — ideal for heavy CNC axes. A larger pinion (30–40 teeth) reduces ratio and increases output speed, better suited for lighter, faster-moving assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What shaft diameter does this gear fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count variant. Please check the variant options on this page for the exact bore size of your selected model.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is carbon steel strong enough for my CNC router drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, for the majority of hobbyist and small-workshop CNC routers. 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These gears conform to ISO Mod 4 tooth geometry with a standard 20° pressure angle, making them directly compatible with any Mod 4 rack.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between a 10-tooth and a 40-tooth pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A 10-tooth pinion (40 mm PCD) suits high-torque, low-speed stages. A 40-tooth pinion (160 mm PCD) suits lower-reduction, higher-speed stages. Most CNC rack-and-pinion setups use 14–20 tooth pinions for a balanced ratio.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer extruder or gantry?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are well-suited for 3D printer gantry and motion systems that use Mod 4 metric gearing. Verify bore diameter and tooth count alignment before ordering.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"4Mod 10Teeth","offer_id":52443235221778,"sku":"GLFBLFFGLBZSJ058241x1","price":12.62,"currency_code":"USD","in_stock":true},{"title":"4Mod 11Teeth","offer_id":52443235254546,"sku":"GLFBLFFGLBZSJ058242x1","price":15.1,"currency_code":"USD","in_stock":true},{"title":"4Mod 12Teeth","offer_id":52443235287314,"sku":"GLFBLFFGLBZSJ058243x1","price":18.05,"currency_code":"USD","in_stock":true},{"title":"4Mod 13Teeth","offer_id":52443235320082,"sku":"GLFBLFFGLBZSJ058244x1","price":19.31,"currency_code":"USD","in_stock":true},{"title":"4Mod 14Teeth","offer_id":52443235352850,"sku":"GLFBLFFGLBZSJ058245x1","price":26.06,"currency_code":"USD","in_stock":true},{"title":"4Mod 15Teeth","offer_id":52443235385618,"sku":"GLFBLFFGLBZSJ058246x1","price":27.25,"currency_code":"USD","in_stock":true},{"title":"4Mod 16Teeth","offer_id":52443235418386,"sku":"GLFBLFFGLBZSJ058247x1","price":30.4,"currency_code":"USD","in_stock":true},{"title":"4Mod 17Teeth","offer_id":52443235451154,"sku":"GLFBLFFGLBZSJ058248x1","price":31.17,"currency_code":"USD","in_stock":true},{"title":"4Mod 18Teeth","offer_id":52443235483922,"sku":"GLFBLFFGLBZSJ058249x1","price":39.41,"currency_code":"USD","in_stock":true},{"title":"4Mod 19Teeth","offer_id":52443235516690,"sku":"GLFBLFFGLBZSJ058250x1","price":41.97,"currency_code":"USD","in_stock":true},{"title":"4Mod 20Teeth","offer_id":52443235549458,"sku":"GLFBLFFGLBZSJ058251x1","price":42.21,"currency_code":"USD","in_stock":true},{"title":"4Mod 21Teeth","offer_id":52443235582226,"sku":"GLFBLFFGLBZSJ058252x1","price":49.79,"currency_code":"USD","in_stock":true},{"title":"4Mod 22Teeth","offer_id":52443235614994,"sku":"GLFBLFFGLBZSJ058253x1","price":53.03,"currency_code":"USD","in_stock":true},{"title":"4Mod 23Teeth","offer_id":52443235647762,"sku":"GLFBLFFGLBZSJ058254x1","price":55.08,"currency_code":"USD","in_stock":true},{"title":"4Mod 24Teeth","offer_id":52443235680530,"sku":"GLFBLFFGLBZSJ058255x1","price":57.3,"currency_code":"USD","in_stock":true},{"title":"4Mod 25Teeth","offer_id":52443235713298,"sku":"GLFBLFFGLBZSJ058256x1","price":110.45,"currency_code":"USD","in_stock":true},{"title":"4Mod 26Teeth","offer_id":52443235746066,"sku":"GLFBLFFGLBZSJ058257x1","price":115.83,"currency_code":"USD","in_stock":true},{"title":"4Mod 27Teeth","offer_id":52443235778834,"sku":"GLFBLFFGLBZSJ058258x1","price":122.64,"currency_code":"USD","in_stock":true},{"title":"4Mod 28Teeth","offer_id":52443235811602,"sku":"GLFBLFFGLBZSJ058259x1","price":127.74,"currency_code":"USD","in_stock":true},{"title":"4Mod 29Teeth","offer_id":52443235844370,"sku":"GLFBLFFGLBZSJ058260x1","price":134.5,"currency_code":"USD","in_stock":true},{"title":"4Mod 31Teeth","offer_id":52443235877138,"sku":"GLFBLFFGLBZSJ058261x1","price":144.72,"currency_code":"USD","in_stock":true},{"title":"4Mod 30Teeth","offer_id":52443235909906,"sku":"GLFBLFFGLBZSJ058262x1","price":140.45,"currency_code":"USD","in_stock":true},{"title":"4Mod 32Teeth","offer_id":52443235942674,"sku":"GLFBLFFGLBZSJ058263x1","price":155.01,"currency_code":"USD","in_stock":true},{"title":"4Mod 33Teeth","offer_id":52443235975442,"sku":"GLFBLFFGLBZSJ058264x1","price":155.54,"currency_code":"USD","in_stock":true},{"title":"4Mod 34Teeth","offer_id":52443236008210,"sku":"GLFBLFFGLBZSJ058265x1","price":165.31,"currency_code":"USD","in_stock":true},{"title":"4Mod 35Teeth","offer_id":52443236040978,"sku":"GLFBLFFGLBZSJ058266x1","price":173.4,"currency_code":"USD","in_stock":true},{"title":"4Mod 36Teeth","offer_id":52443236073746,"sku":"GLFBLFFGLBZSJ058267x1","price":182.38,"currency_code":"USD","in_stock":true},{"title":"4Mod 37Teeth","offer_id":52443236106514,"sku":"GLFBLFFGLBZSJ058268x1","price":191.28,"currency_code":"USD","in_stock":true},{"title":"4Mod 38Teeth","offer_id":52443236139282,"sku":"GLFBLFFGLBZSJ058269x1","price":195.99,"currency_code":"USD","in_stock":true},{"title":"4Mod 39Teeth","offer_id":52443236172050,"sku":"GLFBLFFGLBZSJ058270x1","price":206.14,"currency_code":"USD","in_stock":true},{"title":"4Mod 40Teeth","offer_id":52443236204818,"sku":"GLFBLFFGLBZSJ058271x1","price":215.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of6_1_86f1e94a-4325-451e-ba8f-74232ab461e6.jpg?v=1784040167","url":"https:\/\/homediyer.com\/products\/4-modul-steel-spur-gears-pinion-gear-thick-35mm-10-40-teeth-for-3d-cnc","provider":"HomeDIYer","version":"1.0","type":"link"}