{"product_id":"2-mod-spur-gear-15-50-teeth-45-steel-step-pinion-gear","title":"2 Mod Spur Gear 15-50 Teeth Transmission Gear With Step 45# Steel Pinion Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e2 Mod Spur Gear with Step Hub — Precision 45# Steel Pinion Gear for Reliable Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your drive system demands consistent torque transfer and tight dimensional tolerances, a poorly matched gear becomes the weakest link in the chain. Engineers, robotics builders, and CNC hobbyists who need a dependable 2 Mod spur gear with a stepped hub bore will find this series purpose-built for exactly that challenge.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balanced combination of hardness and toughness. The stepped hub design provides a positive axial shoulder for shaft positioning, simplifying assembly. The tooth range spans 15T to 50T (Module 2), with an outer diameter scaling from approximately 34 mm (1.34 in) at 15T up to approximately 104 mm (4.09 in) at 50T. Bore diameter and hub dimensions vary by tooth count — see variant options for exact figures.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: DIY CNC router axis drives requiring a 2 Mod pinion gear for rack-and-pinion motion; small robotic arm joint reduction stages using a 2 Mod steel spur gear pair; and custom gearbox builds for electric go-karts or conveyor prototypes where a stepped hub spur gear simplifies shaft retention.\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 (Mod 2) gear systems. Meshes with any standard M2 spur gear, rack, or pinion of matching module and pressure angle (20°). Verify bore diameter against your shaft size before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 2 Mod Step Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\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 hardness and toughness profile suited to moderate-to-high load drive applications without brittleness.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 2 Standard Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eFull 20° pressure angle, Module 2 involute tooth form ensures interchangeability with any M2-compatible mating gear or rack in your system.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eStepped Hub for Positive Shaft Positioning\u003c\/strong\u003e\n\u003cp\u003eThe integrated step hub provides a machined shoulder that locates the gear axially on the shaft, reducing the need for additional collars or spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eWide Tooth Count Range: 15T – 50T\u003c\/strong\u003e\n\u003cp\u003e36 discrete sizes from 15 to 50 teeth let you dial in the exact gear ratio your drive stage requires without resorting to custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eConsistent Pitch Accuracy\u003c\/strong\u003e\n\u003cp\u003eCNC-turned and hobbed to standard M2 tolerances, ensuring smooth meshing, low backlash, and predictable noise levels across the full tooth range.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\n\u003cp\u003eSuitable for CNC axis drives, robotic joints, conveyor prototypes, electric vehicle reduction stages, and general-purpose gearbox builds requiring a 2 Mod steel spur gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 2 Mod Spur Gear\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 (M2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e15T – 50T (36 sizes)\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub (shoulder bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace 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\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc per order\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 teeth by the driving gear teeth to get the ratio. For example, pairing a 2M 15T pinion with a 2M 30T gear gives a 2:1 reduction. Use smaller tooth counts for higher speed, larger counts for higher torque output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is Module 2 and will it mesh with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (M) is the standardized metric tooth size parameter. Module 2 means the pitch diameter equals 2 × number of teeth (in mm). These gears will mesh correctly with any other standard M2 spur gear or rack that also uses a 20° pressure angle. Do not mix with Module 1.5, Module 2.5, or imperial DP gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel (roughly equivalent to AISI 1045) offers a tensile strength of approximately 600–800 MPa in the normalized condition. It is well-suited for moderate-to-high torque drive stages, CNC axis drives, and robotic joints. For very high-shock or continuous heavy-duty industrial loads, consider whether a heat-treated or alloy steel variant is more appropriate for your specific duty cycle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears corrode if used in a humid or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For humid, wet, or outdoor environments, apply a light machine oil or grease coating during operation, or consider adding a protective surface treatment (zinc plating, black oxide, or paint) after purchase. For fully corrosion-resistant applications, a stainless steel or plastic gear may be more appropriate.\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\u003eThe bore diameter varies by tooth count. Please check the variant-specific dimension drawing or contact us with your tooth count selection and we will confirm the bore size. Measure your shaft diameter with calipers before ordering. A standard H7 bore tolerance is typical; if you need a custom bore, contact us prior to purchase.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes the stepped hub require a keyway or set screw for shaft retention?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe stepped hub provides axial positioning via its shoulder. Radial retention (preventing rotation on the shaft) typically requires a keyway, set screw, or interference fit. Whether a keyway or set screw is pre-machined depends on the specific variant — please contact us to confirm before ordering if shaft retention method is critical to your design.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a rack-and-pinion linear drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any tooth count in this series can function as a pinion driving a standard M2 gear rack. Smaller tooth counts (15T–20T) are commonly used as CNC axis pinions for compact drive stages. Ensure the rack is also Module 2 with a 20° pressure angle for correct meshing.\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 Size (tooth count) 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 teeth by the driving gear teeth to get the ratio. For example, pairing a 2M 15T pinion with a 2M 30T gear gives a 2:1 reduction. Use smaller tooth counts for higher speed, larger counts for higher torque output.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is Module 2 and will it mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module 2 means the pitch diameter equals 2 × number of teeth (in mm). These gears mesh with any standard M2 spur gear or rack with a 20° pressure angle. Do not mix with Module 1.5, Module 2.5, or imperial DP gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel offers approximately 600–800 MPa tensile strength. It is well-suited for moderate-to-high torque CNC, robotic, and gearbox applications. For very high-shock or continuous heavy-duty industrial loads, a heat-treated or alloy steel variant may be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode in a humid or outdoor environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. Apply machine oil or grease during operation, or add a protective surface treatment for humid or outdoor use.\"\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. Check the variant-specific dimension drawing or contact us with your tooth count to confirm the bore size before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the stepped hub require a keyway or set screw for shaft retention?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stepped hub provides axial positioning. Radial retention requires a keyway, set screw, or interference fit. Contact us to confirm whether a keyway or set screw is pre-machined for your specific variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a rack-and-pinion linear drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any tooth count in this series can drive a standard M2 gear rack. Ensure the rack is Module 2 with a 20° pressure angle for correct meshing.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2M 15T \/ 1 pcs","offer_id":52442767655186,"sku":"GYWYPSHXJZC3411x1","price":11.14,"currency_code":"USD","in_stock":true},{"title":"2M 16T \/ 1 pcs","offer_id":52442767687954,"sku":"GYWYPSHXJZC3412x1","price":12.72,"currency_code":"USD","in_stock":true},{"title":"2M 17T \/ 1 pcs","offer_id":52442767720722,"sku":"GYWYPSHXJZC3413x1","price":13.45,"currency_code":"USD","in_stock":true},{"title":"2M 18T \/ 1 pcs","offer_id":52442767753490,"sku":"GYWYPSHXJZC3414x1","price":15.98,"currency_code":"USD","in_stock":true},{"title":"2M 19T \/ 1 pcs","offer_id":52442767786258,"sku":"GYWYPSHXJZC3415x1","price":18.16,"currency_code":"USD","in_stock":true},{"title":"2M 20T \/ 1 pcs","offer_id":52442767819026,"sku":"GYWYPSHXJZC3416x1","price":19.38,"currency_code":"USD","in_stock":true},{"title":"2M 21T \/ 1 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