{"product_id":"3-modul-45-steel-spur-gears-pinion-gear-thick-30mm-10-36-teeth-for-3d-cnc","title":"3 Modul 45# Steel Spur Gears Pinion Gear Thick 30mm 10-36 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 Spur Gears in 45# Steel — Reliable Power Transmission for 3D Printers \u0026amp; CNC Machines\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or undersized gear stalls your build mid-project, every minute of downtime costs you. Makers, engineers, and CNC hobbyists who demand consistent torque transfer and dimensional accuracy need a gear they can trust across hundreds of operating hours. These Module 3 spur gears are machined from 45# medium-carbon steel to deliver the rigidity and wear resistance that plastic or low-grade metal alternatives simply cannot match.\u003c\/p\u003e\n    \u003cp\u003eEach gear features a Module 3 tooth profile with a 30 mm (1.18 in) face width, available in 10 through 36 teeth. The bore and keyway dimensions vary by tooth count — refer to variant options for exact bore specifications. The 45# steel construction provides a tensile strength typically in the range of 600–800 MPa, making these gears well-suited for moderate-to-high load applications without the bulk of cast-iron alternatives.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: direct-drive extruder upgrades on FDM 3D printers requiring precise filament feed ratios; Z-axis and gantry drive systems on CNC routers and laser engravers where backlash must be minimized; and custom robotics or automation rigs where a compact, steel-bodied spur gear replaces a worn nylon or POM component. Long-tail applications also include DIY lathe gear trains, motorized camera sliders, and educational STEM mechanism kits.\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 3 tooth profile — meshes with any standard Mod 3 rack, pinion, or mating gear. Verify bore diameter and keyway against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 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\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from 45# steel for a balance of hardness and machinability, delivering durability under sustained rotational loads without brittleness.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 3 Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eStandard Mod 3 geometry ensures direct interchangeability with any Mod 3 rack or mating gear — no custom tooling or adapters required.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003e30 mm Face Width for Increased Load Capacity\u003c\/strong\u003e\n        \u003cp\u003eA 30 mm (1.18 in) thick gear body distributes torque across a wider contact area, reducing tooth stress and extending service life compared to thinner alternatives.\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: 10–36 Teeth\u003c\/strong\u003e\n        \u003cp\u003eSelect from 27 variants (10T through 36T) to dial in your exact gear ratio for extruder drives, CNC axes, or custom transmission designs.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003ePrecision-Cut Teeth for Low Backlash\u003c\/strong\u003e\n        \u003cp\u003eCNC-hobbed tooth flanks maintain consistent pitch and pressure angle, minimizing positional error in motion-critical applications like 3D printer axes and robotic joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eVersatile Across Multiple Drive Systems\u003c\/strong\u003e\n        \u003cp\u003eSuitable for 3D printer extruders, CNC router drives, laser engraver gantries, robotics, and DIY automation — wherever a compact steel spur gear 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 3 Steel Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e3 (Mod 3)\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\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e30 mm (1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 – 36 Teeth\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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e30 mm (10T) – 108 mm (36T)\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\u003eKeyway\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\u003eNatural steel (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Form\u003c\/th\u003e\n\u003ctd\u003eInvolute spur\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Gear Type\u003c\/th\u003e\n\u003ctd\u003eMod 3 spur gears, racks, pinions\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003e3D printers, CNC routers, robotics, automation\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\u003eYour gear ratio is determined by dividing the tooth count of the driven gear by the tooth count of the driving gear. For example, pairing a 10-tooth pinion with a 30-tooth gear gives a 3:1 reduction. Calculate your required ratio first, then select the tooth counts that achieve it while fitting within your available space envelope. The pitch diameter equals Module × Tooth Count, so a 3 Mod 20-tooth gear has a 60 mm pitch diameter.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of 45# steel, and is it strong enough for my load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel typically exhibits a tensile strength in the range of 600–800 MPa and a yield strength of approximately 355–490 MPa in the normalized or quenched-and-tempered condition. For most 3D printer, CNC router, and light robotics applications, this is more than adequate. For very high-torque or impact-loaded drives, consider whether a heat-treated or alloy steel gear would 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 Mod 3 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with a Module 3 tooth profile and a 20° pressure angle will mesh correctly with these gears. Module is a standardized metric system, so Mod 3 components from different manufacturers are interchangeable as long as the module and pressure angle match. Always verify the pressure angle (20° is standard) before mixing components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter does each variant have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and is listed in the variant options on this page. Please check the specific variant detail before ordering to confirm the bore fits your shaft. If you need a custom bore size, the 45# steel material is readily machinable for secondary boring or reaming operations.\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# steel is not inherently corrosion-resistant. These gears are supplied with a natural steel finish and will oxidize if exposed to moisture without protection. For environments with humidity or occasional liquid exposure, apply a light machine oil or grease to the tooth flanks and bore. For highly corrosive environments, consider stainless steel or plastic alternatives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a 3D printer extruder drive?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 3 steel spur gears are commonly used in direct-drive and geared extruder designs where a precise, low-backlash gear mesh is needed to control filament feed rate. Select the tooth count that achieves your target gear ratio (typically 3:1 to 5:1 for most extruder designs), and verify the bore matches your motor shaft diameter. The 30 mm face width provides ample contact area for the torque levels typical of extruder stepper motors.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these gears require lubrication?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor optimal performance and longevity, apply a thin film of gear grease or machine oil to the tooth flanks before initial operation. Re-lubricate periodically based on your duty cycle — light intermittent use may only require lubrication every few months, while continuous or high-speed operation benefits from more frequent intervals. Avoid dry running, which accelerates tooth wear on steel-to-steel mesh pairs.\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 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\": \"Your gear ratio is determined by dividing the tooth count of the driven gear by the tooth count of the driving gear. The pitch diameter equals Module × Tooth Count, so a 3 Mod 20-tooth gear has a 60 mm pitch diameter. Calculate your required ratio first, then select tooth counts that fit your space envelope.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of 45# steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel typically exhibits a tensile strength of 600–800 MPa and yield strength of approximately 355–490 MPa, suitable for most 3D printer, CNC router, and light robotics applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Mod 3 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any Module 3, 20° pressure angle gear or rack will mesh correctly with these gears. Always verify the pressure angle before mixing components from different sources.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter does each variant have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and is listed in the variant options on this page. The 45# steel is readily machinable for secondary boring if a custom bore size is needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel is not inherently corrosion-resistant. Apply machine oil or grease to protect against oxidation in humid environments. For highly corrosive conditions, consider stainless steel alternatives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer extruder drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 3 steel spur gears work well in direct-drive and geared extruder designs. Select the tooth count for your target gear ratio (typically 3:1 to 5:1) and verify the bore matches your motor shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears require lubrication?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Apply a thin film of gear grease or machine oil to tooth flanks before initial operation and re-lubricate periodically. Avoid dry running, which accelerates tooth wear on steel-to-steel mesh pairs.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3Mod 10Teeth","offer_id":52442839843090,"sku":"GLFBLFFGLBZSJ058177x1","price":16.55,"currency_code":"USD","in_stock":true},{"title":"3Mod 11Teeth","offer_id":52442839875858,"sku":"GLFBLFFGLBZSJ058178x1","price":21.11,"currency_code":"USD","in_stock":true},{"title":"3Mod 12Teeth","offer_id":52442839908626,"sku":"GLFBLFFGLBZSJ058179x1","price":25.55,"currency_code":"USD","in_stock":true},{"title":"3Mod 13Teeth","offer_id":52442839941394,"sku":"GLFBLFFGLBZSJ058180x1","price":32.01,"currency_code":"USD","in_stock":true},{"title":"3Mod 14Teeth","offer_id":52442839974162,"sku":"GLFBLFFGLBZSJ058181x1","price":32.01,"currency_code":"USD","in_stock":true},{"title":"3Mod 15Teeth","offer_id":52442840006930,"sku":"GLFBLFFGLBZSJ058182x1","price":37.03,"currency_code":"USD","in_stock":true},{"title":"3Mod 16Teeth","offer_id":52442840039698,"sku":"GLFBLFFGLBZSJ058183x1","price":37.67,"currency_code":"USD","in_stock":true},{"title":"3Mod 17Teeth","offer_id":52442840072466,"sku":"GLFBLFFGLBZSJ058184x1","price":43.67,"currency_code":"USD","in_stock":true},{"title":"3Mod 18Teeth","offer_id":52442840105234,"sku":"GLFBLFFGLBZSJ058185x1","price":43.87,"currency_code":"USD","in_stock":true},{"title":"3Mod 19Teeth","offer_id":52442840138002,"sku":"GLFBLFFGLBZSJ058186x1","price":48.55,"currency_code":"USD","in_stock":true},{"title":"3Mod 20Teeth","offer_id":52442840170770,"sku":"GLFBLFFGLBZSJ058187x1","price":54.75,"currency_code":"USD","in_stock":true},{"title":"3Mod 21Teeth","offer_id":52442840203538,"sku":"GLFBLFFGLBZSJ058188x1","price":61.31,"currency_code":"USD","in_stock":true},{"title":"3Mod 22Teeth","offer_id":52442840236306,"sku":"GLFBLFFGLBZSJ058189x1","price":62.23,"currency_code":"USD","in_stock":true},{"title":"3Mod 23Teeth","offer_id":52442840269074,"sku":"GLFBLFFGLBZSJ058190x1","price":68.46,"currency_code":"USD","in_stock":true},{"title":"3Mod 24Teeth","offer_id":52442840301842,"sku":"GLFBLFFGLBZSJ058191x1","price":74.88,"currency_code":"USD","in_stock":true},{"title":"3Mod 25Teeth","offer_id":52442840334610,"sku":"GLFBLFFGLBZSJ058192x1","price":81.1,"currency_code":"USD","in_stock":true},{"title":"3Mod 26Teeth","offer_id":52442840367378,"sku":"GLFBLFFGLBZSJ058193x1","price":87.45,"currency_code":"USD","in_stock":true},{"title":"3Mod 27Teeth","offer_id":52442840400146,"sku":"GLFBLFFGLBZSJ058194x1","price":93.68,"currency_code":"USD","in_stock":true},{"title":"3Mod 28Teeth","offer_id":52442840432914,"sku":"GLFBLFFGLBZSJ058195x1","price":93.68,"currency_code":"USD","in_stock":true},{"title":"3Mod 29Teeth","offer_id":52442840465682,"sku":"GLFBLFFGLBZSJ058196x1","price":101.16,"currency_code":"USD","in_stock":true},{"title":"3Mod 30Teeth","offer_id":52442840498450,"sku":"GLFBLFFGLBZSJ058197x1","price":107.39,"currency_code":"USD","in_stock":true},{"title":"3Mod 31Teeth","offer_id":52442840531218,"sku":"GLFBLFFGLBZSJ058198x1","price":120.02,"currency_code":"USD","in_stock":true},{"title":"3Mod 32Teeth","offer_id":52442840563986,"sku":"GLFBLFFGLBZSJ058199x1","price":202.97,"currency_code":"USD","in_stock":true},{"title":"3Mod 33Teeth","offer_id":52442840596754,"sku":"GLFBLFFGLBZSJ058200x1","price":209.18,"currency_code":"USD","in_stock":true},{"title":"3Mod 34Teeth","offer_id":52442840629522,"sku":"GLFBLFFGLBZSJ058201x1","price":214.8,"currency_code":"USD","in_stock":true},{"title":"3Mod 35Teeth","offer_id":52442840662290,"sku":"GLFBLFFGLBZSJ058202x1","price":220.7,"currency_code":"USD","in_stock":true},{"title":"3Mod 36Teeth","offer_id":52442840695058,"sku":"GLFBLFFGLBZSJ058203x1","price":227.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of9_85e16df8-b7fe-4eb3-a6f1-648a85823ccb.jpg?v=1783615932","url":"https:\/\/homediyer.com\/products\/3-modul-45-steel-spur-gears-pinion-gear-thick-30mm-10-36-teeth-for-3d-cnc","provider":"HomeDIYer","version":"1.0","type":"link"}