{"product_id":"convex-spur-gear-2-0-mod-45-steel-convex-spur-gears-36t-50t-bore-14mm-30mm","title":"Convex Spur Gear 2.0 Mod #45 Steel Convex Spur Gears 36T~50T Bore=14mm~30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2.0 Mod #45 Steel Convex Spur Gears — Reliable Power Transmission for DIY Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control build demands consistent torque transfer and tight mesh accuracy, an undersized or poorly machined spur gear becomes the weakest link in the entire drivetrain. Whether you are a maker assembling a CNC gantry, an engineer prototyping a conveyor stage, or a hobbyist building a custom gearbox, these 2.0 module convex spur gears are engineered to deliver repeatable, low-backlash performance across a wide range of shaft sizes.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from #45 carbon steel — a medium-carbon alloy known for its balance of hardness, toughness, and machinability — and features a convex tooth profile that promotes smooth engagement and reduces edge loading under load. The tooth count range spans 36T to 50T, and bore options run from 14 mm (~0.55 in) up to 30 mm (~1.18 in), with keyway dimensions matched to each bore size per standard DIN\/JIS conventions. A burr-hole (unfinished bore) option is also available for custom boring to your exact shaft diameter.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY CNC router Z-axis drives, small-scale conveyor belt reduction stages, robotic arm joint assemblies, and educational lab gear-train demonstrations — anywhere a 2.0 mod pitch gear with a keyed bore is required for positive shaft engagement.\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 2.0 module (Mod 2) spur or helical gear. Verify center distance using the formula: \u003cem\u003eCD = (T1 + T2) × m \/ 2\u003c\/em\u003e, where m = 2.0 mm. Bore+Keyway dimensions follow standard DIN 6885 keyway tolerances.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 2.0 Mod #45 Steel Convex Spur 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 combination of surface hardness and core toughness, resisting wear under sustained rotational loads.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n      \u003cstrong\u003eConvex Tooth Profile\u003c\/strong\u003e\n      \u003cp\u003eThe convex tooth geometry promotes gradual tooth engagement, reducing impact noise and distributing contact stress more evenly across the face width compared to standard straight-cut profiles.\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: 36T – 50T\u003c\/strong\u003e\n      \u003cp\u003eFive tooth-count options (36T, 38T, 40T, 45T, 50T) let you dial in the exact gear ratio needed for your reduction stage without custom machining.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n      \u003cstrong\u003eMultiple Bore + Keyway Options\u003c\/strong\u003e\n      \u003cp\u003eBore sizes from 14 mm to 30 mm with matched keyways (K=5 to K=10 mm) ensure positive shaft locking. A burr-hole option is available for custom boring to your exact shaft diameter.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n      \u003cstrong\u003eStandard 2.0 Module Pitch\u003c\/strong\u003e\n      \u003cp\u003eFully interchangeable with any Mod 2 gear in your drivetrain — no special tooling or adapters required. Drop-in compatible with standard 2.0 module racks, pinions, and mating gears.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n      \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e\n      \u003cp\u003eSuited for CNC machines, conveyor drives, robotic joints, educational gear-train kits, and general-purpose power transmission projects requiring a keyed spur gear.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 2.0 Mod Convex Spur Gear\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e2.0 mm\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\u003eConvex (modified 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\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e36T, 38T, 40T, 45T, 50T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e72 mm – 100 mm (2.83 in – 3.94 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e14 mm – 30 mm (0.55 in – 1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 10 mm (matched to bore per DIN 6885)\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\u003eHub Diameter\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\u003eBore Type Options\u003c\/th\u003e\n\u003ctd\u003eBurr hole (unfinished) or finished bore with keyway\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Standard\u003c\/th\u003e\n\u003ctd\u003eCompatible with DIN \/ JIS Mod 2 systems\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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 counts based on the gear ratio you need: divide the driven gear teeth by the driver gear teeth to get the ratio. For example, pairing a 40T gear with a 20T pinion gives a 2:1 reduction. Use the center distance formula CD = (T1 + T2) × 1 mm (for Mod 2) to verify shaft spacing before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore size should I order if my shaft diameter is between listed options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder the \"Burr hole\" variant, which ships with an unfinished bore. You or a local machine shop can then bore and key it to your exact shaft diameter. This is the recommended approach for non-standard shaft sizes or tight-tolerance fits.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears compatible with standard Mod 2 racks and pinions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These gears follow the standard 2.0 module pitch, so they mesh correctly with any Mod 2 spur gear, rack, or pinion that uses a 20° pressure angle. Always confirm the pressure angle of your mating gear before assembly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are #45 steel gears compared to aluminum or plastic alternatives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e#45 carbon steel offers significantly higher tensile strength (typically 600–800 MPa) compared to aluminum (~270 MPa) or engineering plastics (~80 MPa). This makes them suitable for moderate-to-high torque applications where aluminum or plastic gears would deform or wear prematurely.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these gears require any surface treatment or lubrication?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e#45 steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease to the tooth faces and bore. For long-term corrosion protection, consider having the gear zinc-plated or applying a rust-inhibiting coating after installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat keyway standard do these gears follow?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe keyway dimensions follow DIN 6885 \/ JIS B 1301 standard proportions, where keyway width and depth are matched to the bore diameter. For example, a 20 mm bore uses a 6 mm wide keyway (K=6), and a 30 mm bore uses an 8 mm wide keyway (K=8). Always verify keyway dimensions against your shaft key before assembly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a CNC router or 3D printer build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These Mod 2 steel spur gears are well-suited for CNC router axis drives, extruder gearboxes, and similar maker builds where a keyed steel gear is needed for positive shaft engagement and repeatable positioning. Confirm your existing gear module is 2.0 before ordering.\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 Mod\/Teeth and Bore+Keyway 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 counts based on the gear ratio you need: divide the driven gear teeth by the driver gear teeth to get the ratio. For example, pairing a 40T gear with a 20T pinion gives a 2:1 reduction. Use the center distance formula CD = (T1 + T2) × 1 mm (for Mod 2) to verify shaft spacing before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I order if my shaft diameter is between listed options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order the Burr hole variant, which ships with an unfinished bore. You or a local machine shop can then bore and key it to your exact shaft diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears compatible with standard Mod 2 racks and pinions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears follow the standard 2.0 module pitch, so they mesh correctly with any Mod 2 spur gear, rack, or pinion that uses a 20° pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are #45 steel gears compared to aluminum or plastic alternatives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"#45 carbon steel offers significantly higher tensile strength (typically 600–800 MPa) compared to aluminum (~270 MPa) or engineering plastics (~80 MPa), making them suitable for moderate-to-high torque applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears require any surface treatment or lubrication?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"#45 steel is not inherently corrosion-resistant. Apply a light machine oil or grease to the tooth faces and bore. For long-term protection, consider zinc-plating or a rust-inhibiting coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What keyway standard do these gears follow?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The keyway dimensions follow DIN 6885 \/ JIS B 1301 standard proportions, matched to the bore diameter. For example, a 20 mm bore uses a 6 mm wide keyway (K=6), and a 30 mm bore uses an 8 mm wide keyway (K=8).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a CNC router or 3D printer build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These Mod 2 steel spur gears are well-suited for CNC router axis drives, extruder gearboxes, and similar maker builds where a keyed steel gear is needed for positive shaft engagement.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2M-36T \/ Burr hole","offer_id":52443130134802,"sku":"WXBJGJXCD2241x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=14+K=5","offer_id":52443130167570,"sku":"WXBJGJXCD2242x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=15+K=5","offer_id":52443130200338,"sku":"WXBJGJXCD2243x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=16+K=5","offer_id":52443130233106,"sku":"WXBJGJXCD2244x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=18+K=6","offer_id":52443130265874,"sku":"WXBJGJXCD2245x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=20+K=6","offer_id":52443130298642,"sku":"WXBJGJXCD2246x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=22+K=6","offer_id":52443130331410,"sku":"WXBJGJXCD2247x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=24+K=8","offer_id":52443130364178,"sku":"WXBJGJXCD2248x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-36T \/ B=25+K=8","offer_id":52443130396946,"sku":"WXBJGJXCD2249x1","price":114.95,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ Burr hole","offer_id":52443130429714,"sku":"WXBJGJXCD2250x1","price":127.45,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=15+K=5","offer_id":52443130462482,"sku":"WXBJGJXCD2251x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=16+K=5","offer_id":52443130495250,"sku":"WXBJGJXCD2252x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=18+K=6","offer_id":52443130528018,"sku":"WXBJGJXCD2253x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=20+K=6","offer_id":52443130560786,"sku":"WXBJGJXCD2254x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=22+K=6","offer_id":52443130593554,"sku":"WXBJGJXCD2255x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=24+K=8","offer_id":52443130626322,"sku":"WXBJGJXCD2256x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=25+K=8","offer_id":52443130659090,"sku":"WXBJGJXCD2257x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=28+K=8","offer_id":52443130691858,"sku":"WXBJGJXCD2258x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-38T \/ B=30+K=8","offer_id":52443130724626,"sku":"WXBJGJXCD2259x1","price":130.3,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ Burr hole","offer_id":52443130757394,"sku":"WXBJGJXCD2260x1","price":145.48,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=16+K=5","offer_id":52443130790162,"sku":"WXBJGJXCD2261x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=18+K=6","offer_id":52443130822930,"sku":"WXBJGJXCD2262x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=20+K=6","offer_id":52443130855698,"sku":"WXBJGJXCD2263x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=22+K=6","offer_id":52443130888466,"sku":"WXBJGJXCD2264x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=24+K=8","offer_id":52443130921234,"sku":"WXBJGJXCD2265x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=25+K=8","offer_id":52443130954002,"sku":"WXBJGJXCD2266x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=28+K=8","offer_id":52443130986770,"sku":"WXBJGJXCD2267x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=30+K=8","offer_id":52443131019538,"sku":"WXBJGJXCD2268x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=32+K=10","offer_id":52443131052306,"sku":"WXBJGJXCD2269x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-40T \/ B=35+K=10","offer_id":52443131085074,"sku":"WXBJGJXCD2270x1","price":149.04,"currency_code":"USD","in_stock":true},{"title":"2M-45T \/ Burr hole","offer_id":52443131117842,"sku":"WXBJGJXCD2271x1","price":30.8,"currency_code":"USD","in_stock":true},{"title":"2M-50T \/ Burr hole","offer_id":52443131150610,"sku":"WXBJGJXCD2280x1","price":239.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_917677aa-c92e-42c6-ae5e-c0abca99f284.jpg?v=1784021570","url":"https:\/\/homediyer.com\/products\/convex-spur-gear-2-0-mod-45-steel-convex-spur-gears-36t-50t-bore-14mm-30mm","provider":"HomeDIYer","version":"1.0","type":"link"}