{"product_id":"mod-5-spur-gears-45-steel-pinion-gear-40mm-10t-29t-transmission-gear","title":"Mod 5 Spur Gears 45# Steel  Pinion Gear Thickn 40mm 10T - 29T Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 5 Spur Gears in 45# Steel — Reliable Pinion Gears for Heavy-Duty Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear brings your CNC router, conveyor, or automation rig to a halt, you need a replacement you can trust to hold torque without play. These Mod 5 spur gears are machined for engineers, makers, and industrial maintenance teams who demand dimensional accuracy and consistent mesh quality across every tooth count.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, delivering a solid balance of hardness and machinability. The tooth profile follows the standard Module 5 (Mod 5) specification with a 20° pressure angle. Face width (thickness) is 40 mm (approx. 1.57 in), and the available tooth counts run from 10T through 29T — covering pitch circle diameters from approximately 50 mm (1.97 in) up to 145 mm (5.71 in).\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC machine spindle drives requiring mod 5 pinion gears, robotic arm joint transmission assemblies, and industrial conveyor reduction stages where a steel spur gear with 40mm face width provides the load capacity needed for continuous-duty cycles.\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 Mod 5 spur or rack gear with a 20° pressure angle. Bore diameter and keyway vary by tooth count — see variant options or contact us to confirm fit before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Mod 5 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\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a tensile strength typically in the 600–800 MPa range, giving these pinion gears the toughness to handle sustained radial and tangential loads without deforming under shock.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eStandard Mod 5 \/ 20° Pressure Angle Profile\u003c\/strong\u003e\n\u003cp\u003eTooth geometry conforms to the ISO\/DIN Module 5 standard with a 20° pressure angle, ensuring smooth, low-noise mesh with any compatible Mod 5 mating gear or rack in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n\u003cstrong\u003e40 mm Face Width for High Load Capacity\u003c\/strong\u003e\n\u003cp\u003eA 40 mm (1.57 in) tooth face width distributes contact stress across a wide surface, reducing wear rate and extending service life compared to narrower gears in the same module class.\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 to 29T\u003c\/strong\u003e\n\u003cp\u003eTwenty discrete tooth counts let you dial in the exact gear ratio your transmission requires — from compact 10-tooth pinions for high-speed stages to 29-tooth gears for torque-multiplying reduction steps.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cstrong\u003ePrecision-Machined Bore and Hub\u003c\/strong\u003e\n\u003cp\u003eEach gear is turned and hobbed to consistent tolerances, with a machined center bore ready for shaft fitting. Keyway and set-screw options vary by tooth count — see variant options for details.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eDirect Drop-In for CNC, Robotics, and Conveyor Drives\u003c\/strong\u003e\n\u003cp\u003eThe standardized Mod 5 pitch makes these gears interchangeable with existing Mod 5 components in CNC routers, robotic joints, and conveyor reduction stages, minimizing downtime during replacement or upgrades.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Mod 5 Spur 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\u003eMod 5 (M5)\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\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e40 mm (1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 29T (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter Range\u003c\/th\u003e\n\u003ctd\u003e50 mm – 145 mm (approx. 1.97 in – 5.71 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile Standard\u003c\/th\u003e\n\u003ctd\u003eISO\/DIN Module 5\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs\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\u003eThe tooth count determines your gear ratio. Divide the tooth count of the driven gear by the tooth count of the driving pinion to get the ratio. For example, pairing a 10T pinion with a 20T gear gives a 2:1 reduction. Choose a smaller tooth count for higher speed output and a larger tooth count for more torque. If you are replacing an existing gear, match the tooth count exactly to maintain your original ratio.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of 45# steel, and is it strong enough for my load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel typically achieves a tensile strength of approximately 600–800 MPa in the normalized or quenched-and-tempered condition. For most CNC, robotics, and light-to-medium industrial conveyor applications, this is more than adequate. If your application involves very high shock loads or continuous heavy-duty cycling, consider whether a hardened or alloy-steel gear would better suit your requirements.\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# carbon steel has limited inherent corrosion resistance. For indoor, dry, or lightly oiled environments these gears perform well with standard lubrication. If your application involves moisture, chemicals, or outdoor exposure, we recommend applying a rust-inhibiting grease or oil regularly, or contacting us to discuss alternative material options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these Mod 5 gears mesh with my existing rack or gear set?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as your existing rack or mating gear is also Module 5 with a 20° pressure angle, these gears will mesh correctly. Module (pitch) and pressure angle must match between mating gears. If you are unsure of your existing gear's module, you can measure the pitch circle diameter and divide by the tooth count; the result should equal 5 mm for a Mod 5 gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter does each tooth-count variant have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and hub size. Please refer to the variant options on this page or contact us with your shaft diameter before ordering so we can confirm the correct fit. We can also advise on keyway dimensions if your shaft requires a keyed connection.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a vertical load or overhung shaft configuration?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpur gears transmit torque through radial tooth forces and do not generate axial thrust, making them suitable for both horizontal and vertical shaft orientations. For overhung shaft configurations, ensure your bearing arrangement is rated for the resulting radial load at the gear mesh point. The 40 mm face width helps distribute load, but proper shaft and bearing sizing remains essential for reliable operation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to purchase a matching gear, or can I use one of these as a standalone replacement?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are sold individually (1 Pcs per order) and are designed as direct replacements for any worn or damaged Mod 5 pinion in your existing drivetrain. If you need a complete gear pair or a mating gear of a different tooth count, simply add the required variants to your cart separately. Contact us if you need help selecting a matched pair for a specific ratio.\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 (Types) 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\": \"The tooth count determines your gear ratio. Divide the tooth count of the driven gear by the tooth count of the driving pinion to get the ratio. For example, pairing a 10T pinion with a 20T gear gives a 2:1 reduction. Choose a smaller tooth count for higher speed output and a larger tooth count for more torque. If you are replacing an existing gear, match the tooth count exactly to maintain your original ratio.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of 45# steel, and is it strong enough for my load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel typically achieves a tensile strength of approximately 600–800 MPa in the normalized or quenched-and-tempered condition. For most CNC, robotics, and light-to-medium industrial conveyor applications, this is more than adequate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has limited inherent corrosion resistance. For indoor, dry, or lightly oiled environments these gears perform well with standard lubrication. Apply a rust-inhibiting grease or oil regularly for moisture or outdoor exposure.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these Mod 5 gears mesh with my existing rack or gear set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as your existing rack or mating gear is also Module 5 with a 20° pressure angle, these gears will mesh correctly. Module and pressure angle must match between mating gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter does each tooth-count variant have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and hub size. Please refer to the variant options on this page or contact us with your shaft diameter before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a vertical load or overhung shaft configuration?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spur gears transmit torque through radial tooth forces and do not generate axial thrust, making them suitable for both horizontal and vertical shaft orientations. Ensure your bearing arrangement is rated for the resulting radial load at the gear mesh point.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to purchase a matching gear, or can I use one of these as a standalone replacement?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are sold individually (1 Pcs per order) and are designed as direct replacements for any worn or damaged Mod 5 pinion in your existing drivetrain. Add the required variants to your cart separately if you need a complete gear pair.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5M 10T \/ 1 Pcs","offer_id":52442584088850,"sku":"GYFYGLBZSJ058301x1","price":51.61,"currency_code":"USD","in_stock":true},{"title":"5M 11T \/ 1 Pcs","offer_id":52442584121618,"sku":"GYFYGLBZSJ058302x1","price":56.7,"currency_code":"USD","in_stock":true},{"title":"5M 12T \/ 1 Pcs","offer_id":52442584154386,"sku":"GYFYGLBZSJ058303x1","price":61.59,"currency_code":"USD","in_stock":true},{"title":"5M 13T \/ 1 Pcs","offer_id":52442584187154,"sku":"GYFYGLBZSJ058304x1","price":66.57,"currency_code":"USD","in_stock":true},{"title":"5M 14T \/ 1 Pcs","offer_id":52442584219922,"sku":"GYFYGLBZSJ058305x1","price":72.01,"currency_code":"USD","in_stock":true},{"title":"5M 15T \/ 1 Pcs","offer_id":52442584252690,"sku":"GYFYGLBZSJ058306x1","price":81.45,"currency_code":"USD","in_stock":true},{"title":"5M 16T \/ 1 Pcs","offer_id":52442584285458,"sku":"GYFYGLBZSJ058307x1","price":90.64,"currency_code":"USD","in_stock":true},{"title":"5M 17T \/ 1 Pcs","offer_id":52442584318226,"sku":"GYFYGLBZSJ058308x1","price":104.03,"currency_code":"USD","in_stock":true},{"title":"5M 18T \/ 1 Pcs","offer_id":52442584350994,"sku":"GYFYGLBZSJ058309x1","price":113.14,"currency_code":"USD","in_stock":true},{"title":"5M 19T \/ 1 Pcs","offer_id":52442584383762,"sku":"GYFYGLBZSJ058310x1","price":122.66,"currency_code":"USD","in_stock":true},{"title":"5M 20T \/ 1 Pcs","offer_id":52442584416530,"sku":"GYFYGLBZSJ058311x1","price":135.31,"currency_code":"USD","in_stock":true},{"title":"5M 21T \/ 1 Pcs","offer_id":52442584449298,"sku":"GYFYGLBZSJ058312x1","price":149.31,"currency_code":"USD","in_stock":true},{"title":"5M 22T \/ 1 Pcs","offer_id":52442584482066,"sku":"GYFYGLBZSJ058313x1","price":159.05,"currency_code":"USD","in_stock":true},{"title":"5M 23T \/ 1 Pcs","offer_id":52442584514834,"sku":"GYFYGLBZSJ058314x1","price":173.11,"currency_code":"USD","in_stock":true},{"title":"5M 24T \/ 1 Pcs","offer_id":52442584547602,"sku":"GYFYGLBZSJ058315x1","price":186.99,"currency_code":"USD","in_stock":true},{"title":"5M 25T \/ 1 Pcs","offer_id":52442584580370,"sku":"GYFYGLBZSJ058316x1","price":196.51,"currency_code":"USD","in_stock":true},{"title":"5M 26T \/ 1 Pcs","offer_id":52442584613138,"sku":"GYFYGLBZSJ058317x1","price":214.05,"currency_code":"USD","in_stock":true},{"title":"5M 27T \/ 1 Pcs","offer_id":52442584645906,"sku":"GYFYGLBZSJ058318x1","price":233.77,"currency_code":"USD","in_stock":true},{"title":"5M 28T \/ 1 Pcs","offer_id":52442584678674,"sku":"GYFYGLBZSJ058319x1","price":244.65,"currency_code":"USD","in_stock":true},{"title":"5M 29T \/ 1 Pcs","offer_id":52442584711442,"sku":"GYFYGLBZSJ058320x1","price":258.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_e5360050-4244-45f3-9d6e-b96e9cc9d935.jpg?v=1783566438","url":"https:\/\/homediyer.com\/products\/mod-5-spur-gears-45-steel-pinion-gear-40mm-10t-29t-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}