{"product_id":"spur-gear-45-steel-transmission-gear-2-module-10-40-teeth-pinion-motor-gear","title":"Spur Gear 45# Steel Transmission Gear 2 Module 10~40 Teeth Pinion Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpur Gear 45# Steel — Reliable 2 Module Pinion Gear for Motor Drive Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear brings your build to a halt, you need a replacement that fits precisely and holds up under load. These 45# carbon steel spur gears are designed for makers, robotics builders, CNC hobbyists, and small-machine engineers who demand consistent mesh accuracy and long service life from their motion-control components.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel and follows a standard 2-module tooth profile. The range covers 10 to 40 teeth, with corresponding outside diameters from 24 mm (0.94 in) to 84 mm (3.31 in). Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs. Available in packs of 1, 2, or 3 pieces to suit prototyping or small-batch production needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor pinion drives in tabletop CNC routers, gear-reduction stages in DIY robotic arms, and speed-ratio adjustments in custom conveyor or actuator assemblies. Long-tail search terms such as \"2 mod steel spur gear 20 teeth\", \"45 steel pinion gear CNC\", and \"metric module 2 transmission gear\" all describe this product family.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits any mating gear or rack with \u003cstrong\u003eModule 2 (Mod 2)\u003c\/strong\u003e tooth profile. Verify bore diameter and keyway against your shaft before ordering — see variant options for bore details.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMedium-carbon steel provides a solid balance of machinability and wear resistance, suitable for moderate-load gear drives without the cost of alloy steel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eStandard Module 2 Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eConforms to the metric Module 2 standard, ensuring accurate mesh with any compatible Mod 2 gear, rack, or pinion in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Selection (10T–40T)\u003c\/strong\u003e\n\u003cp\u003eThirty-one tooth-count options from 10T to 40T let you dial in the exact gear ratio your application requires without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1, 2, or 3 pieces per SKU — ideal for single-prototype builds, redundancy spares, or small-batch production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eConsistent OD-to-Tooth Relationship\u003c\/strong\u003e\n\u003cp\u003eOutside diameter scales predictably with tooth count (OD = (Z + 2) × module), making gear-ratio calculations and housing design straightforward.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e \u003cstrong\u003eDrop-In Replacement for Mod 2 Drives\u003c\/strong\u003e\n\u003cp\u003eDimensionally interchangeable with other Mod 2 spur gears, so you can swap worn gears in existing assemblies without redesigning the gear housing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2 (Metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter Range\u003c\/th\u003e\n\u003ctd\u003e24 mm – 84 mm (0.94 in – 3.31 in)\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\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 2 Pcs \/ 3 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\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\n\u003cp\u003eGear ratio equals the driven gear's tooth count divided by the driving gear's tooth count. For example, pairing a 10T pinion with a 30T gear gives a 3:1 reduction. Select the tooth count that achieves your target speed or torque ratio. Outside diameter scales as OD = (Z + 2) × 2 mm, so a 20T gear has an OD of 44 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can these gears handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel offers moderate tensile strength (typically 600–800 MPa after heat treatment). These gears are suited for light-to-medium duty drives such as robotics, small CNC machines, and hobby automation. For heavy industrial loads or continuous high-torque applications, consider alloy steel or hardened gears.\u003c\/p\u003e\n\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\n\u003cp\u003e45# steel has limited inherent corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease after installation. If corrosion resistance is critical, consider stainless steel or nylon gears instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these mesh with my existing Module 2 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — any gear or rack with a Module 2 (Mod 2) tooth profile and a 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering. Imperial DP gears are not compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the bore fits my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by tooth count and is listed in the variant details. Measure your motor shaft diameter with calipers before selecting a variant. If the standard bore is too small, the gear can typically be bored out by a machine shop to your required diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears without lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eShort-term dry operation is possible at low speeds and light loads, but lubrication significantly extends gear life. Apply a thin film of grease (e.g., lithium-based or molybdenum disulfide grease) to the tooth flanks during assembly and re-lubricate periodically based on duty cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 1 Pcs, 2 Pcs, and 3 Pcs pack options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll three pack options contain identical gears of the same tooth count and outside diameter. The pack quantity simply determines how many pieces you receive per order. The 2 Pcs and 3 Pcs options offer a lower per-piece cost and are convenient when you need spares or are building multiple identical assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count, outside diameter, and pack quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"10T \/ 24mm \/ 1 Pcs","offer_id":52443331199250,"sku":"GLFBBYWHK-KCSJ2624x1","price":7.93,"currency_code":"USD","in_stock":true},{"title":"10T \/ 24mm \/ 2 Pcs","offer_id":52443331232018,"sku":"GLFBBYWHK-KCSJ2624x2","price":14.55,"currency_code":"USD","in_stock":true},{"title":"10T \/ 24mm \/ 3 Pcs","offer_id":52443331264786,"sku":"GLFBBYWHK-KCSJ2624x3","price":21.19,"currency_code":"USD","in_stock":true},{"title":"11T \/ 26mm \/ 1 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Pcs","offer_id":52443332215058,"sku":"GLFBBYWHK-KCSJ2634x2","price":30.87,"currency_code":"USD","in_stock":true},{"title":"20T \/ 44mm \/ 3 Pcs","offer_id":52443332247826,"sku":"GLFBBYWHK-KCSJ2634x3","price":45.67,"currency_code":"USD","in_stock":true},{"title":"21T \/ 46mm \/ 1 Pcs","offer_id":52443332280594,"sku":"GLFBBYWHK-KCSJ2635x1","price":17.35,"currency_code":"USD","in_stock":true},{"title":"21T \/ 46mm \/ 2 Pcs","offer_id":52443332313362,"sku":"GLFBBYWHK-KCSJ2635x2","price":33.43,"currency_code":"USD","in_stock":true},{"title":"21T \/ 46mm \/ 3 Pcs","offer_id":52443332346130,"sku":"GLFBBYWHK-KCSJ2635x3","price":49.48,"currency_code":"USD","in_stock":true},{"title":"22T \/ 48mm \/ 1 Pcs","offer_id":52443332378898,"sku":"GLFBBYWHK-KCSJ2636x1","price":18.63,"currency_code":"USD","in_stock":true},{"title":"22T \/ 48mm \/ 2 Pcs","offer_id":52443332411666,"sku":"GLFBBYWHK-KCSJ2636x2","price":35.97,"currency_code":"USD","in_stock":true},{"title":"22T \/ 48mm \/ 3 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