{"product_id":"2-5-mod-10-41-teeth-spur-gears-transmission-gear-pinion-thickness-25mm-45-steel","title":"2.5 Mod 10-41 Teeth Spur Gears Transmission Gear Pinion Thickness 25mm 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2.5 Mod Spur Gears — Precision Transmission Pinions for Reliable DIY Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or mismatched gear brings your CNC router, conveyor, or automation rig to a halt, the fix starts with the right tooth count and the right steel. These 2.5 Mod spur gears are engineered for makers, small-workshop builders, and engineering students who need a dependable transmission pinion without sourcing from an industrial distributor. Available in 10 through 41 teeth, they cover a wide reduction-ratio range in a single product family.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel — a material known for its balanced hardness and toughness — with a face (thickness) of 25 mm (approximately 0.98 in). The module is 2.5 mm, meaning the pitch diameter scales predictably: a 20-tooth gear has a 50 mm pitch diameter, a 30-tooth gear has a 75 mm pitch diameter, and so on. Bore diameter varies by tooth count; see variant options for exact bore dimensions.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY CNC axis drives where a 2.5 Mod pinion meshes with a rack or larger gear, tabletop robotic arm joints requiring compact torque transmission, and educational lab setups demonstrating gear-ratio principles with a standardized module series. The 25 mm face width provides enough contact area for moderate-load continuous-duty cycles in these applications.\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 2.5 Module (Mod 2.5) spur gear, rack, or pinion. Verify bore diameter and keyway requirements against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 2.5 Mod Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Steel Construction\u003c\/strong\u003e — Medium-carbon steel delivers a practical balance of surface hardness and core toughness, resisting tooth wear under sustained meshing loads.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth-Count Range (10–41T)\u003c\/strong\u003e — A single product family covers ratios from roughly 1:4 down to near 1:1, reducing the need to source gears from multiple suppliers.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003e25 mm Face Width\u003c\/strong\u003e — The 25 mm (≈0.98 in) thickness provides adequate contact area for moderate-duty continuous operation in CNC, robotics, and conveyor applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStandardized 2.5 Module\u003c\/strong\u003e — Module 2.5 is an ISO-standard pitch, ensuring straightforward meshing calculations and compatibility with any other Mod 2.5 gear or rack.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities (1 \/ 2 \/ 3 pcs)\u003c\/strong\u003e — Order a single gear for a prototype or a multi-piece set for a paired drive stage — all at a per-unit price that scales with quantity.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e — Suited for DIY CNC axis drives, robotic arm joints, educational gear-train demonstrations, and light industrial automation where a standardized module simplifies design.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — 2.5 Mod Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 41T (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e25 mm (≈0.98 in)\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Teeth (e.g., 2.5 × 20T = 50 mm)\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\u003eMachined, natural steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 2 pcs \/ 3 pcs (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Pitch\u003c\/th\u003e\n\u003ctd\u003eMod 2.5 (ISO standard)\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 calculate the pitch diameter for my chosen tooth count?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePitch diameter = Module × Number of Teeth. For a 2.5 Mod gear: a 20T gear has a 50 mm pitch diameter, a 30T gear has 75 mm, and a 40T gear has 100 mm. Use this formula to verify center-distance spacing before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tooth count should I choose for my gear ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 10T pinion with a 40T gear gives a 4:1 reduction. This product covers 10T–41T, so you can achieve ratios from approximately 1:1 up to about 4:1 within this single family.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Mod 2.5 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with a 2.5 mm module and a matching 20° pressure angle will mesh correctly with these pinions. Confirm the module and pressure angle of your existing components before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under continuous load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has a tensile strength typically in the range of 600–800 MPa in its normalized state. The 25 mm face width distributes load across a reasonable contact area. These gears are suited for moderate-duty continuous operation such as CNC axis drives and robotic joints; they are not rated for heavy industrial shock loads without additional engineering analysis.\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. For indoor or dry-environment use, applying a light machine oil or grease to the tooth surfaces is sufficient. For humid or outdoor environments, consider a protective coating or periodic re-lubrication to prevent surface rust.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter and keyway does each variant have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter and keyway dimensions vary by tooth count. Please refer to the variant detail images or contact us to confirm the exact bore size for your selected tooth count before ordering, especially if you need a specific shaft fit.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I order 1, 2, or 3 pieces?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder 1 pc for a single-stage prototype or replacement. Order 2 pcs if you need a matched pair for a parallel drive or want a spare on hand. Order 3 pcs for a multi-stage gear train or a small production run. Multi-piece packs are priced per-unit at a lower rate than single-piece orders.\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 (Choose Model) and packing quantity 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 calculate the pitch diameter for my chosen tooth count?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pitch diameter = Module × Number of Teeth. For a 2.5 Mod gear: a 20T gear has a 50 mm pitch diameter, a 30T gear has 75 mm, and a 40T gear has 100 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tooth count should I choose for my gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear teeth by the driving gear teeth to get the ratio. Pairing a 10T pinion with a 40T gear gives a 4:1 reduction. This product covers 10T–41T.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Mod 2.5 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with a 2.5 mm module and a matching 20° pressure angle will mesh correctly with these pinions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under continuous load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has a tensile strength typically in the range of 600–800 MPa. The 25 mm face width distributes load across a reasonable contact area, suited for moderate-duty continuous operation.\"\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 a light machine oil or grease to tooth surfaces for indoor use. For humid environments, periodic re-lubrication or a protective coating is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter and keyway does each variant have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter and keyway dimensions vary by tooth count. Please refer to the variant detail images or contact us to confirm the exact bore size for your selected tooth count.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1, 2, or 3 pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order 1 pc for a prototype or replacement, 2 pcs for a matched pair or spare, and 3 pcs for a multi-stage gear train or small production run.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5M 10T \/ 1 pcs","offer_id":52443223556370,"sku":"GLFBFHHGLBZSJ058105x1","price":12.51,"currency_code":"USD","in_stock":true},{"title":"2.5M 11T \/ 1 pcs","offer_id":52443223589138,"sku":"GLFBFHHGLBZSJ058106x1","price":19.31,"currency_code":"USD","in_stock":true},{"title":"2.5M 12T \/ 1 pcs","offer_id":52443223621906,"sku":"GLFBFHHGLBZSJ058107x1","price":24.29,"currency_code":"USD","in_stock":true},{"title":"2.5M 13T \/ 1 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