{"product_id":"spur-gear-module-2-5-pinion-gears-45-steel-10t-to-30t","title":"Spur Gear Module 2.5 Pinion Gears #45 Steel 12T to 30T Metal Spur Transmission","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eModule 2.5 Spur Pinion Gears — Reliable #45 Steel Transmission for CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear stalls your CNC router, robotics arm, or automation rig mid-cycle, the cost is more than downtime — it's lost precision and rework. Engineers, makers, and small-batch manufacturers who need a dependable, drop-in spur pinion gear turn to Module 2.5 steel gears that hold tight tolerances run after run.\u003c\/p\u003e\n\u003cp\u003eThese spur pinion gears are machined from #45 carbon steel, a medium-carbon alloy known for its balanced hardness and toughness. The module is 2.5 (pitch = 2.5 mm per tooth), with tooth counts ranging from 10T to 30T across the available variants. Bore diameter and hub dimensions vary by tooth count — see variant options for exact figures. Each gear features a standard involute tooth profile for smooth, low-noise meshing.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC gantry drives requiring precise rack-and-pinion positioning, robotic joint actuators where compact gear sets transmit torque in tight spaces, and industrial conveyor or indexing systems that demand consistent gear mesh under cyclic loads. Long-tail applications such as \"module 2.5 replacement pinion gear for CNC router\" and \"45 steel spur gear 20 tooth automation\" are well served by this range.\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 Module 2.5 spur gear or rack. Verify bore diameter and keyway requirements against your shaft before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Module 2.5 Spur Pinion Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e#45 Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from #45 medium-carbon steel for a strong balance of surface hardness and core toughness, resisting wear under sustained mesh loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eModule 2.5 Involute Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStandard involute geometry ensures smooth, low-noise engagement and full interchangeability with any Module 2.5 mating gear or rack.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth-Count Range: 10T – 30T\u003c\/strong\u003e\n\u003cp\u003eFourteen tooth-count options (10T, 11T, 12T, 13T, 14T, 15T, 16T, 18T, 20T, 23T, 24T, 25T, 28T, 30T) let you dial in the exact gear ratio your drive system needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eConsistent Machined Tolerances\u003c\/strong\u003e\n\u003cp\u003eEach pinion is turned and hobbed to maintain repeatable tooth spacing and runout, keeping your transmission backlash predictable across the full tooth-count range.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eMulti-Pack Quantity Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1, 2, 3, 4, or 5-piece packs per variant — order spares alongside your primary gear to minimize future downtime on production builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e\n\u003cp\u003eSuited for CNC routers, 3D printer extruder drives, robotic actuators, conveyor indexers, and any motion-control system calling for a Module 2.5 steel pinion.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Module 2.5 Spur Pinion Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e10T, 11T, 12T, 13T, 14T, 15T, 16T, 18T, 20T, 23T, 24T, 25T, 28T, 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e#45 Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard Involute\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\u003eSee variant options (Module × Teeth)\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 \/ Face Width\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\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1, 2, 3, 4, or 5 Pcs (select variant)\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 pinion. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Select a tooth count that achieves your target ratio while keeping the center distance within your mechanical envelope. The pitch diameter equals Module × Teeth (e.g., 2.5 × 20T = 50 mm PD).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat material are these gears made from, and how strong are they?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e#45 carbon steel (roughly equivalent to AISI 1045) has a tensile strength typically in the range of 600–800 MPa in the normalized condition. It offers good machinability and can be further hardened by heat treatment if your application demands higher surface hardness. For most CNC and light-industrial automation loads, the as-machined condition is sufficient.\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\u003e#45 carbon steel is not inherently stainless. In humid or wet environments, apply a light machine oil or anti-corrosion coating after installation. For outdoor or washdown applications, consider pairing with a protective grease or sourcing a stainless-steel alternative.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this pinion mesh with my existing Module 2.5 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with a Module 2.5 standard involute profile and a 20° pressure angle will mesh correctly with these pinions. Confirm the module and pressure angle on your mating component before ordering. Module is not interchangeable with Diametral Pitch (DP) imperial gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the bore diameter fits my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count. Please refer to the variant detail page or contact us to confirm the bore size for your selected tooth count before ordering. A bore that is too small can be enlarged by a machinist; a bore that is too large will require a bushing or keyway insert.\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 or light robotics project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAbsolutely. Module 2.5 steel pinion gears are commonly used in extruder drives, Z-axis lead-screw couplings, and robotic joint actuators where plastic gears would wear prematurely. The smaller tooth counts (10T–14T) are popular for compact drive stages, while larger counts (20T–30T) suit lower-ratio or higher-torque stages.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhy should I order a multi-pack instead of a single gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrdering 2–5 pieces at once reduces per-unit cost and ensures you have on-hand spares for maintenance or prototype iterations. For production builds or machines running continuous duty cycles, keeping a spare pinion on the shelf eliminates lead-time delays when a gear eventually needs replacement.\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 Module\/Teeth count and 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 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 pinion. The pitch diameter equals Module x Teeth (e.g., 2.5 x 20T = 50 mm PD). Select a tooth count that achieves your target ratio while keeping the center distance within your mechanical envelope.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What material are these gears made from, and how strong are they?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"#45 carbon steel (roughly equivalent to AISI 1045) has a tensile strength typically in the range of 600-800 MPa in the normalized condition. It offers good machinability and can be further hardened by heat treatment if your application demands higher surface hardness.\"\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 stainless. In humid or wet environments, apply a light machine oil or anti-corrosion coating after installation. For outdoor or washdown applications, consider pairing with a protective grease.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this pinion mesh with my existing Module 2.5 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with a Module 2.5 standard involute profile and a 20 degree pressure angle will mesh correctly with these pinions. Confirm the module and pressure angle on your mating component before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I verify the bore diameter fits my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count. Please refer to the variant detail page or contact us to confirm the bore size for your selected tooth count before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer or light robotics project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 2.5 steel pinion gears are commonly used in extruder drives, Z-axis lead-screw couplings, and robotic joint actuators. Smaller tooth counts (10T-14T) suit compact drive stages; larger counts (20T-30T) suit lower-ratio or higher-torque stages.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why should I order a multi-pack instead of a single gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Ordering 2-5 pieces at once reduces per-unit cost and ensures you have on-hand spares for maintenance or prototype iterations, eliminating lead-time delays when a gear eventually needs replacement.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5M 10T \/ 1 Pcs","offer_id":52442508787986,"sku":"FAS-KCSJ2655x1","price":16.99,"currency_code":"USD","in_stock":true},{"title":"2.5M 10T \/ 2 Pcs","offer_id":52442508820754,"sku":"FAS-KCSJ2655x2","price":28.17,"currency_code":"USD","in_stock":true},{"title":"2.5M 10T \/ 3 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