{"product_id":"4-modul-45-steel-spur-gears-pinion-gear-thick-35mm-10-25-teeth-for-3d-cnc","title":"4 Modul 45# Steel Spur Gears Pinion Gear Thick 35mm 10-25 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4 Mod 45# Steel Spur Gears — Precision Pinion Gears for CNC, 3D Printing \u0026amp; Industrial Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped or undersized gear stalls your CNC router, 3D printer, or automated drive system, every minute of downtime costs you. Engineers, makers, and machine builders who demand repeatable torque transmission need a spur gear that holds tolerance under load — not one that wears out after a few hundred cycles. These 4 Mod 45# steel spur gears are engineered for exactly that workload.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, a material known for its balanced hardness and machinability. The tooth profile follows the standard 4-module (Mod 4) metric pitch, with a uniform face width of 35 mm (approximately 1.38 in). Tooth counts span 10 through 25 teeth, giving pitch circle diameters ranging from approximately 40 mm (1.57 in) for the 10T up to 100 mm (3.94 in) for the 25T variant.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: rack-and-pinion CNC gantry drives requiring a 4 Mod steel pinion gear, open-frame 3D printer Z-axis or extruder reduction stages, and light industrial conveyor or rotary indexing systems where a metric spur gear with 35 mm face width provides the necessary contact ratio.\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 4 Module (Mod 4) metric spur gear or rack. Bore diameter and keyway vary by tooth count — see variant options for shaft fit details.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 4 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers a reliable balance of tensile strength and machinability, suitable for moderate-to-heavy torque transmission in CNC and drive applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStandard 4 Module (Mod 4) Tooth Profile\u003c\/strong\u003e — Fully interchangeable with any Mod 4 metric gear or rack, simplifying replacement and system expansion without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e35 mm Uniform Face Width\u003c\/strong\u003e — Consistent 35 mm (≈1.38 in) tooth depth across all tooth-count variants ensures even load distribution and predictable contact ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\u003cstrong\u003e10–25 Tooth Range in One Listing\u003c\/strong\u003e — Sixteen tooth-count options (10T through 25T) cover a wide gear-ratio range, from compact high-speed pinions to larger reduction stages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eMachined Bore for Shaft Mounting\u003c\/strong\u003e — Each gear features a precision-bored center hole sized to the tooth count; confirm bore diameter in the variant selector before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eSuited for CNC, 3D Printing \u0026amp; Light Industrial Use\u003c\/strong\u003e — Designed for rack-and-pinion CNC gantries, 3D printer drive stages, rotary indexers, and similar metric gear-drive systems.\u003c\/li\u003e\n\u003c\/ul\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\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\u003e35 mm (≈1.38 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter Range\u003c\/th\u003e\n\u003ctd\u003e40 mm (10T) – 100 mm (25T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard metric)\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Gear Standard\u003c\/th\u003e\n\u003ctd\u003eMod 4 metric spur gear \/ rack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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\u003eSelect the tooth count based on your required gear ratio and available shaft center distance. For a rack-and-pinion CNC drive, fewer teeth (10–14T) give faster linear travel per motor revolution; more teeth (20–25T) increase torque and reduce speed. Use the formula: center distance = (T1 + T2) × Module \/ 2 to verify mesh with a mating gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pitch circle diameter for each tooth count?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePitch circle diameter (PCD) = Teeth × Module. For Mod 4: 10T = 40 mm, 12T = 48 mm, 15T = 60 mm, 18T = 72 mm, 20T = 80 mm, 24T = 96 mm, 25T = 100 mm. Intermediate values follow the same formula.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel, and will it handle my load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition. It is well-suited for moderate-to-heavy torque transmission in CNC routers, 3D printer drives, and light industrial machinery. For very high-shock or continuous heavy-duty cycles, consider a hardened or alloy-steel alternative.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has limited inherent corrosion resistance. For indoor or dry environments this is generally acceptable. If your application involves moisture, coolant, or outdoor exposure, apply a rust-inhibiting oil or grease to the gear teeth, or contact us to confirm whether a coated variant is available.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod 4 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack manufactured to the standard Mod 4 metric profile with a 20° pressure angle will mesh correctly with these spur gears. Verify that your existing component is labeled \"Module 4\" or \"Mod 4\" (not DP or CP pitch systems, which are not compatible).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\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 selector. Please check the variant options above before ordering to confirm the bore fits your motor or drive shaft. If you need a custom bore size, contact us to confirm availability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a 3D printer or CNC router build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These 4 Mod steel spur gears are commonly used in open-frame CNC gantry rack-and-pinion drives, 3D printer Z-axis reduction stages, and extruder gear trains where a robust metric pinion gear is required. Confirm the tooth count and bore diameter match your motor shaft and mating rack specification before purchasing.\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    {\"@type\": \"Question\", \"name\": \"How do I choose the right tooth count for my application?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Select the tooth count based on your required gear ratio and available shaft center distance. For a rack-and-pinion CNC drive, fewer teeth (10–14T) give faster linear travel per motor revolution; more teeth (20–25T) increase torque and reduce speed.\"}},\n    {\"@type\": \"Question\", \"name\": \"What is the pitch circle diameter for each tooth count?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"PCD = Teeth × Module. For Mod 4: 10T = 40 mm, 12T = 48 mm, 15T = 60 mm, 18T = 72 mm, 20T = 80 mm, 24T = 96 mm, 25T = 100 mm.\"}},\n    {\"@type\": \"Question\", \"name\": \"How strong is 45# steel, and will it handle my load?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa, suitable for moderate-to-heavy torque transmission in CNC routers, 3D printer drives, and light industrial machinery.\"}},\n    {\"@type\": \"Question\", \"name\": \"Are these gears corrosion-resistant?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"45# carbon steel has limited inherent corrosion resistance. Apply a rust-inhibiting oil or grease for moisture or coolant exposure.\"}},\n    {\"@type\": \"Question\", \"name\": \"Will this gear mesh with my existing Mod 4 rack or gear?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — any Mod 4 metric gear or rack with a 20° pressure angle will mesh correctly with these spur gears.\"}},\n    {\"@type\": \"Question\", \"name\": \"What bore diameter does each variant have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Bore diameter varies by tooth count and is listed in the variant selector. Check variant options before ordering.\"}},\n    {\"@type\": \"Question\", \"name\": \"Can I use these gears in a 3D printer or CNC router build?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. These 4 Mod steel spur gears are commonly used in CNC gantry rack-and-pinion drives, 3D printer Z-axis reduction stages, and extruder gear trains.\"}}\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"4Mod 10Teeth","offer_id":52442840727826,"sku":"GLFBLFFGLBZSJ058241x1","price":26.22,"currency_code":"USD","in_stock":true},{"title":"4Mod 11Teeth","offer_id":52442840760594,"sku":"GLFBLFFGLBZSJ058242x1","price":31.32,"currency_code":"USD","in_stock":true},{"title":"4Mod 12Teeth","offer_id":52442840793362,"sku":"GLFBLFFGLBZSJ058243x1","price":37.48,"currency_code":"USD","in_stock":true},{"title":"4Mod 13Teeth","offer_id":52442840826130,"sku":"GLFBLFFGLBZSJ058244x1","price":40.09,"currency_code":"USD","in_stock":true},{"title":"4Mod 14Teeth","offer_id":52442840858898,"sku":"GLFBLFFGLBZSJ058245x1","price":51.64,"currency_code":"USD","in_stock":true},{"title":"4Mod 15Teeth","offer_id":52442840891666,"sku":"GLFBLFFGLBZSJ058246x1","price":54.02,"currency_code":"USD","in_stock":true},{"title":"4Mod 16Teeth","offer_id":52442840924434,"sku":"GLFBLFFGLBZSJ058247x1","price":60.25,"currency_code":"USD","in_stock":true},{"title":"4Mod 17Teeth","offer_id":52442840957202,"sku":"GLFBLFFGLBZSJ058248x1","price":64.74,"currency_code":"USD","in_stock":true},{"title":"4Mod 18Teeth","offer_id":52442840989970,"sku":"GLFBLFFGLBZSJ058249x1","price":81.86,"currency_code":"USD","in_stock":true},{"title":"4Mod 19Teeth","offer_id":52442841022738,"sku":"GLFBLFFGLBZSJ058250x1","price":87.15,"currency_code":"USD","in_stock":true},{"title":"4Mod 20Teeth","offer_id":52442841055506,"sku":"GLFBLFFGLBZSJ058251x1","price":87.64,"currency_code":"USD","in_stock":true},{"title":"4Mod 21Teeth","offer_id":52442841088274,"sku":"GLFBLFFGLBZSJ058252x1","price":105.37,"currency_code":"USD","in_stock":true},{"title":"4Mod 22Teeth","offer_id":52442841121042,"sku":"GLFBLFFGLBZSJ058253x1","price":112.23,"currency_code":"USD","in_stock":true},{"title":"4Mod 23Teeth","offer_id":52442841153810,"sku":"GLFBLFFGLBZSJ058254x1","price":116.59,"currency_code":"USD","in_stock":true},{"title":"4Mod 24Teeth","offer_id":52442841186578,"sku":"GLFBLFFGLBZSJ058255x1","price":121.27,"currency_code":"USD","in_stock":true},{"title":"4Mod 25Teeth","offer_id":52442841219346,"sku":"GLFBLFFGLBZSJ058256x1","price":233.78,"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\/4-modul-45-steel-spur-gears-pinion-gear-thick-35mm-10-25-teeth-for-3d-cnc","provider":"HomeDIYer","version":"1.0","type":"link"}