{"product_id":"5-mod-10-15-teeth-spur-gear-pinion-40mm-45-steel","title":"5 Mod 10-15 Teeth Spur Gears Transmission Gear Pinion Thickness 40mm 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e5 Mod Spur Gears — Reliable Transmission Pinions for DIY Drives \u0026amp; Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen your gearbox project demands consistent torque transfer and dimensional accuracy, undersized or mismatched gears become an immediate bottleneck. Whether you are a maker building a custom reduction drive, an engineer prototyping a conveyor system, or a hobbyist assembling a CNC axis, these 5 Mod spur gear pinions give you the tooth-count flexibility and structural integrity to keep your build moving forward.\u003c\/p\u003e\n    \u003cp\u003eEach pinion is machined from 45# medium-carbon steel — a material known for its balanced hardness and machinability — and features a uniform tooth thickness of 40 mm (approximately 1.57 in). The module is 5 (Mod 5), with tooth counts ranging from 10T to 15T, covering pitch circle diameters from approximately 50 mm (1.97 in) to 75 mm (2.95 in). Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY gearbox reduction stages for stepper-motor driven axes, rack-and-pinion linear actuators in workshop automation, and open-frame robotics joints requiring a compact yet robust spur gear pinion. The 5 Mod pitch is widely used in maker-grade and light-industrial transmission gear applications, making replacement and mating gear sourcing straightforward.\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 Mates with any standard Mod 5 spur gear or rack. Verify bore diameter and keyway dimensions against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 5 Mod Spur Gear Pinions\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\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 solid balance of tensile strength and machinability, resisting deformation under sustained load in transmission gear applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eUniform 40 mm Face Width\u003c\/strong\u003e\n        \u003cp\u003eA consistent 40 mm (1.57 in) tooth thickness across all tooth-count variants ensures even load distribution and predictable mesh behavior in your gearbox.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\n        \u003cstrong\u003e6 Tooth-Count Options (10T – 15T)\u003c\/strong\u003e\n        \u003cp\u003eChoose from 10, 11, 12, 13, 14, or 15 teeth to dial in your gear ratio without changing the module or face width — ideal for iterative drive design.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStandard Mod 5 Pitch\u003c\/strong\u003e\n        \u003cp\u003eThe internationally recognized Module 5 standard means these pinions mate directly with any Mod 5 spur gear, rack, or gearbox component from any supplier.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eCorrosion-Resistant Surface Finish\u003c\/strong\u003e\n        \u003cp\u003eA protective surface treatment helps guard against oxidation during storage and light-duty operation, extending service life in workshop and indoor automation environments.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e\n        \u003cp\u003eConsistent outer diameter and bore tolerances across the range make these pinions straightforward to swap into existing Mod 5 drive trains without custom machining.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 5 Spur Gear Pinion\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e5 (Mod 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e10T, 11T, 12T, 13T, 14T, 15T\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\u003ePitch Circle Diameter Range\u003c\/th\u003e\n\u003ctd\u003e50 mm – 75 mm (1.97 in – 2.95 in)\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\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\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\u003eProtective anti-oxidation treatment\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\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per unit\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 determines the tooth count you need. Divide the tooth count of the mating (driven) gear by the tooth count of this pinion (driver) to get the reduction ratio. For example, pairing a 10T pinion with a 50T gear gives a 5:1 reduction. Start with your required output speed and torque, then work backwards to select the pinion tooth count that achieves your target ratio within the 10T–15T range available here.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load capacity of these spur gear pinions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel offers a tensile strength of approximately 600–800 MPa depending on heat treatment. For precise load ratings (tangential force, bending stress, contact stress), apply standard AGMA or ISO 6336 gear strength calculations using the module, face width, and material properties. These pinions are suited for light-to-medium duty transmission applications typical in DIY automation, robotics, and workshop machinery.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe surface treatment provides basic protection against oxidation during storage and indoor use. For outdoor, high-humidity, or washdown environments, we recommend applying a compatible gear lubricant or grease, or considering stainless steel alternatives. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these pinions mate with my existing Mod 5 gears or rack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack manufactured to the Mod 5 standard with a matching 20° pressure angle will mesh correctly with these pinions. Verify that the mating component also uses a 20° pressure angle, as mixing pressure angles (e.g., 14.5° and 20°) will result in improper mesh and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter and keyway size do these pinions have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter and keyway dimensions vary by tooth count variant. Please refer to the variant options on this page or contact us with your specific tooth count to confirm the bore and keyway specifications before ordering, especially if you need a precise shaft fit.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears without a keyway (press-fit or set-screw only)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese pinions are designed with a standard keyway for positive torque transmission. If your shaft does not have a keyway, a set-screw hub adapter or a custom-bored version may be required. Contact us to discuss your shaft configuration and we can advise on the best mounting approach for your application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to lubricate these spur gears during operation?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, lubrication is strongly recommended for all steel spur gear applications. Apply a suitable gear grease or oil to the tooth flanks before initial operation and re-lubricate at regular intervals based on your duty cycle. Proper lubrication significantly reduces wear, noise, and heat generation, extending the service life of both the pinion and the mating gear.\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 (Choose Model) 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 determines the tooth count you need. Divide the tooth count of the mating (driven) gear by the tooth count of this pinion (driver) to get the reduction ratio. For example, pairing a 10T pinion with a 50T gear gives a 5:1 reduction. Start with your required output speed and torque, then work backwards to select the pinion tooth count that achieves your target ratio within the 10T–15T range available here.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity of these spur gear pinions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel offers a tensile strength of approximately 600–800 MPa depending on heat treatment. For precise load ratings, apply standard AGMA or ISO 6336 gear strength calculations using the module, face width, and material properties. These pinions are suited for light-to-medium duty transmission applications typical in DIY automation, robotics, and workshop machinery.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The surface treatment provides basic protection against oxidation during storage and indoor use. For outdoor, high-humidity, or washdown environments, we recommend applying a compatible gear lubricant or grease, or considering stainless steel alternatives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these pinions mate with my existing Mod 5 gears or rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack manufactured to the Mod 5 standard with a matching 20° pressure angle will mesh correctly with these pinions. Verify that the mating component also uses a 20° pressure angle, as mixing pressure angles will result in improper mesh and accelerated wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter and keyway size do these pinions have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter and keyway dimensions vary by tooth count variant. Please refer to the variant options on this page or contact us with your specific tooth count to confirm the bore and keyway specifications before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears without a keyway (press-fit or set-screw only)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These pinions are designed with a standard keyway for positive torque transmission. If your shaft does not have a keyway, a set-screw hub adapter or a custom-bored version may be required. Contact us to discuss your shaft configuration.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate these spur gears during operation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, lubrication is strongly recommended for all steel spur gear applications. Apply a suitable gear grease or oil to the tooth flanks before initial operation and re-lubricate at regular intervals based on your duty cycle. Proper lubrication significantly reduces wear, noise, and heat generation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5M 10T \/ 1 pcs","offer_id":52443227980050,"sku":"GLFBFHHGLBZSJ058301x1","price":131.96,"currency_code":"USD","in_stock":true},{"title":"5M 11T \/ 1 pcs","offer_id":52443228012818,"sku":"GLFBFHHGLBZSJ058302x1","price":143.89,"currency_code":"USD","in_stock":true},{"title":"5M 12T \/ 1 pcs","offer_id":52443228045586,"sku":"GLFBFHHGLBZSJ058303x1","price":155.95,"currency_code":"USD","in_stock":true},{"title":"5M 13T \/ 1 pcs","offer_id":52443228078354,"sku":"GLFBFHHGLBZSJ058304x1","price":168.08,"currency_code":"USD","in_stock":true},{"title":"5M 14T \/ 1 pcs","offer_id":52443228111122,"sku":"GLFBFHHGLBZSJ058305x1","price":180.19,"currency_code":"USD","in_stock":true},{"title":"5M 15T \/ 1 pcs","offer_id":52443228143890,"sku":"GLFBFHHGLBZSJ058306x1","price":203.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_19a2fb0a-af9d-4357-9dcd-48e20cb8c753.jpg?v=1784025097","url":"https:\/\/homediyer.com\/products\/5-mod-10-15-teeth-spur-gear-pinion-40mm-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}