{"product_id":"2-5-modul-45-steel-spur-gears-pinion-gear-thick-25mm-10-80-teeth-for-3d-cnc","title":"2.5 Modul 45# Steel Spur Gears Pinion Gear Thick 25mm 10-80 Teeth For 3D CNC","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2.5 Module 45# Steel Spur Gears — Precision Pinion Gears for CNC, 3D Printers \u0026amp; Robotics\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or undersized gear stalls your CNC router, 3D printer, or automation rig mid-job, the cost is more than downtime — it's ruined workpieces and missed deadlines. Makers, machine builders, and workshop engineers who demand repeatable, backlash-controlled motion need a spur gear they can rely on across thousands of cycles. These 2.5 module 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 balance of tensile strength and machinability — and features a 25 mm (0.984 in) face width throughout the range. The bore diameter scales with tooth count and outer diameter: shaft bores range from 8 mm (~0.315 in) on the smallest pinions up to 20 mm (~0.787 in) on the largest 80-tooth wheels, with outer diameters spanning approximately 30 mm (1.18 in) to 205 mm (8.07 in) across the 10–80 tooth selection.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include CNC gantry drives and rack-and-pinion feed systems, extruder and filament-drive assemblies on FDM 3D printers, and light-duty robotic joint or conveyor drive trains where a compact 2.5 mod gear train delivers the torque multiplication needed without excessive bulk.\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 Designed for Module 2.5 gear systems. Mates with any standard Mod 2.5 rack, pinion, or mating gear. Verify bore diameter against your shaft size before ordering — see Size(mm) variant for bore × OD × face-width dimensions.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 2.5 Module 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 reliable combination of surface hardness and core toughness, resisting wear under sustained mesh loads in CNC and automation applications.\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: 10–80 Teeth\u003c\/strong\u003e\n        \u003cp\u003e55 discrete tooth counts let you dial in the exact gear ratio your drive system needs — from compact 10-tooth pinions to large 80-tooth reduction wheels — all in a single consistent module.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eUniform 25 mm Face Width\u003c\/strong\u003e\n        \u003cp\u003eA consistent 25 mm (0.984 in) face width across the entire range simplifies gear-train design and ensures even load distribution across the tooth contact zone.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStandard Module 2.5 Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eConforms to the ISO\/DIN Module 2.5 standard, making these gears interchangeable with any Mod 2.5 rack or mating gear from other suppliers without custom adaptation.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eScaled Bore \u0026amp; OD per Tooth Count\u003c\/strong\u003e\n        \u003cp\u003eBore diameters scale from 8 mm to 20 mm and outer diameters from ~30 mm to ~205 mm as tooth count increases, so each variant is proportionally optimised for its load class.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eSuitable for CNC, 3D Printing \u0026amp; Robotics\u003c\/strong\u003e\n        \u003cp\u003eSized and toleranced for the motion-control demands of CNC routers, FDM extruder drives, and light robotic joints — applications where dimensional consistency directly affects output quality.\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 — 2.5 Module Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2.5\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\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 – 80 Teeth (55 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e25 mm (0.984 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 20 mm (varies by tooth count; see Size(mm) variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e~30 mm – ~205 mm (varies by tooth count)\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\u003eTooth Profile Standard\u003c\/th\u003e\n\u003ctd\u003eModule 2.5 (ISO\/DIN)\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\u003eKeyway \/ Set Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eCNC drives, 3D printer extruders, robotics, conveyor systems\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's tooth count by the driving pinion's tooth count to get the reduction ratio. For example, a 10-tooth pinion meshing with a 40-tooth gear gives a 4:1 reduction. Also confirm that the resulting outer diameter fits within your housing clearance — refer to the Size(mm) variant field for OD values.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat shaft diameter does each gear fit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter scales with tooth count: smaller pinions (10–15 teeth) use an 8 mm bore, mid-range gears (16–25 teeth) use a 10–12 mm bore, and larger wheels (26–80 teeth) use 14–20 mm bores. The exact bore for each variant is listed in the Size(mm) option as Bore × OD × Face-Width (e.g., 8×30×25 means 8 mm bore, 30 mm OD, 25 mm face width).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with a standard Module 2.5 rack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears conform to the Module 2.5 standard with a 20° pressure angle, which is the most common rack-and-pinion specification used in CNC routers and linear motion systems. They will mesh correctly with any ISO\/DIN Mod 2.5 rack or mating gear from any supplier.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has a typical tensile strength of approximately 600–800 MPa and yield strength around 355 MPa in the normalised condition. For heavily loaded or high-cycle applications, consider whether a hardened or case-hardened variant would better suit your duty cycle. For light-to-medium CNC and 3D printer drives, 45# steel in the as-machined condition is generally adequate.\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# carbon steel is not inherently corrosion-resistant. For indoor, dry environments (typical of CNC workshops and 3D printer enclosures) this is not usually a concern. If your application involves moisture, coolant mist, or outdoor exposure, apply a light machine oil or consider a stainless or coated alternative. Wiping the gear with oil after installation is recommended as standard practice.\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 — the smaller tooth-count variants (10–20 teeth) with 8–10 mm bores are well-suited to direct-drive and Bowden extruder gear trains. Confirm that the bore matches your motor shaft diameter and that the OD clears your extruder housing. The 25 mm face width provides ample contact area for the torque levels typical of filament extrusion.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the Size(mm) values listed in the variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe Size(mm) field follows the format Bore × Outer Diameter × Face Width, all in millimetres. For example, \"12×55×25\" means a 12 mm bore, 55 mm outer diameter, and 25 mm face width. Use the bore value to match your shaft, the OD to check housing clearance, and the face width (always 25 mm) to confirm axial alignment with your mating gear.\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 Number of Teeth and Size(mm) 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's tooth count by the driving pinion's tooth count to get the reduction ratio. Also confirm that the resulting outer diameter fits within your housing clearance — refer to the Size(mm) variant field for OD values.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What shaft diameter does each gear fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter scales with tooth count: smaller pinions (10–15 teeth) use an 8 mm bore, mid-range gears (16–25 teeth) use a 10–12 mm bore, and larger wheels (26–80 teeth) use 14–20 mm bores. The exact bore is listed in the Size(mm) option as Bore × OD × Face-Width.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with a standard Module 2.5 rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears conform to the Module 2.5 standard with a 20° pressure angle and will mesh correctly with any ISO\/DIN Mod 2.5 rack or mating gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has a typical tensile strength of approximately 600–800 MPa. For light-to-medium CNC and 3D printer drives, 45# steel in the as-machined condition is generally adequate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. For dry indoor environments this is not usually a concern. Apply a light machine oil after installation as standard practice.\"\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 — the smaller tooth-count variants (10–20 teeth) with 8–10 mm bores are well-suited to direct-drive and Bowden extruder gear trains. Confirm bore matches your motor shaft diameter and OD clears your housing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the Size(mm) values listed in the variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Size(mm) field follows the format Bore × Outer Diameter × Face Width in millimetres. For example, 12×55×25 means a 12 mm bore, 55 mm outer diameter, and 25 mm face width.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"10 Teeth \/ 8X30X25","offer_id":52443309670674,"sku":"WWLFHXCDZH1930x1","price":5.64,"currency_code":"USD","in_stock":true},{"title":"11 Teeth \/ 8X32.5X25","offer_id":52443309703442,"sku":"WWLFHXCDZH1931x1","price":5.7,"currency_code":"USD","in_stock":true},{"title":"12 Teeth \/ 10X35X25","offer_id":52443309736210,"sku":"WWLFHXCDZH1932x1","price":8.55,"currency_code":"USD","in_stock":true},{"title":"13 Teeth \/ 10X37.5X25","offer_id":52443309768978,"sku":"WWLFHXCDZH1933x1","price":8.55,"currency_code":"USD","in_stock":true},{"title":"14 Teeth \/ 10X40X25","offer_id":52443309801746,"sku":"WWLFHXCDZH1934x1","price":8.64,"currency_code":"USD","in_stock":true},{"title":"15 Teeth \/ 10X42.5X25","offer_id":52443309834514,"sku":"WWLFHXCDZH1935x1","price":11.49,"currency_code":"USD","in_stock":true},{"title":"16 Teeth \/ 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