{"product_id":"3-mod-spur-gears-pinion-gear-12-100-teeth-transmission-gear-motor-gear-45-steel","title":"3 Mod Spur Gears Pinion Gear 12-100 Teeth Transmission Gear Motor Gear 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 Spur Gears — Reliable Transmission for CNC, Robotics \u0026amp; Motor Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or mismatched gear brings your build to a halt, you need a replacement you can trust to mesh perfectly and hold up under load. These Module 3 spur gears are engineered for makers, machinists, and automation engineers who demand dimensional accuracy and consistent torque transfer across a wide range of tooth counts.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, delivering a solid balance of strength and machinability. The module (pitch) is 3 mm, with a standard 20° pressure angle. Tooth counts span from 12 to 75 teeth, giving pitch circle diameters that range from approximately 36 mm (1.42 in) for 12T up to 225 mm (8.86 in) for 75T. Bore diameter varies by tooth count — see variant options for exact bore dimensions.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY CNC router axis drives, 3D printer extruder gear trains, robotic arm joint transmission, electric motor reduction stages, and custom gearbox builds where off-the-shelf module 3 spur pinion gears are required for precise speed and torque ratios.\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 Module 3 (Mod 3) spur gear or rack. Pressure angle: 20°. Not compatible with Module 1, 2, or 4 gears.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e45# Steel Construction\u003c\/strong\u003e — Medium-carbon steel provides solid tensile strength and wear resistance for continuous-duty transmission applications.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eStandard Module 3 \/ 20° Pressure Angle\u003c\/strong\u003e — Fully interchangeable with any Mod 3 mating gear or rack; no custom tooling required.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Tooth Count Range (12–75T)\u003c\/strong\u003e — Select the exact gear ratio you need; covers pinion to mid-size driven gear applications in a single product line.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMachined Tooth Profile\u003c\/strong\u003e — Hobbed tooth form ensures smooth meshing, reduced backlash, and consistent load distribution across the full face width.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMachinable Bore\u003c\/strong\u003e — Supplied with a standard bore; easily re-bored, keyed, or set-screwed to match your shaft diameter on a lathe or mill.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSingle-Piece or Multi-Pack Options\u003c\/strong\u003e — Available in 1 Pc per order; ideal for prototyping, replacement, or staged builds without over-ordering.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 3 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e3 mm\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 Range\u003c\/th\u003e\n\u003ctd\u003e12 – 75 Teeth (see variant options)\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\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003eModule × Teeth (e.g. 3 × 20T = 60 mm \/ 2.36 in)\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\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003ePlain bore (machinable)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural steel \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal spur gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pc\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\u003eDivide your desired gear ratio by the tooth count of your mating gear. For example, a 4:1 reduction with a 12-tooth pinion requires a 48-tooth driven gear. Use the pitch circle diameter formula (PCD = Module × Teeth) to verify the center distance fits your housing before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Module 3 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with Module 3 and a 20° pressure angle will mesh correctly with these spur gears. Confirm both the module and pressure angle of your existing components before purchasing, as Module 2.5 or Module 4 gears are not interchangeable.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the strength of 45# steel, and is it suitable for high-torque drives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600–700 MPa in the normalized condition. It is well-suited for moderate-to-high torque transmission in CNC, robotics, and motor drive applications. For extreme shock loads or very high-speed operation, consider heat-treated or alloy steel alternatives.\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\u003e45# steel is not inherently corrosion-resistant. For outdoor or high-humidity environments, apply a light coat of grease or anti-rust oil during installation and re-apply periodically. If corrosion resistance is critical, consider stainless steel or nylon gear alternatives for your application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I re-bore or add a keyway to the standard bore?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The plain bore is machinable on a lathe or mill. You can enlarge the bore to match your shaft diameter, cut a keyway, or drill and tap for a set screw. Ensure sufficient wall thickness remains after machining — check the hub diameter for your selected tooth count before modifying.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the center distance between two meshing Module 3 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (Teeth on Gear 1 + Teeth on Gear 2) × Module ÷ 2. For example, a 20-tooth pinion meshing with a 40-tooth gear: (20 + 40) × 3 ÷ 2 = 90 mm. Use this formula to design your housing or bracket before machining.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat lubricant should I use with these spur gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA general-purpose gear grease (NLGI Grade 1 or 2) or a light machine oil works well for most indoor applications. Apply lubricant to the tooth flanks during assembly and re-lubricate at regular service intervals based on your duty cycle and operating speed.\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 Modulus \u0026amp; Teeth 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\": \"Divide your desired gear ratio by the tooth count of your mating gear. For example, a 4:1 reduction with a 12-tooth pinion requires a 48-tooth driven gear. Use the pitch circle diameter formula (PCD = Module x Teeth) to verify the center distance fits your housing before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Module 3 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with Module 3 and a 20 degree pressure angle will mesh correctly with these spur gears. Confirm both the module and pressure angle of your existing components before purchasing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the strength of 45# steel, and is it suitable for high-torque drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600-700 MPa in the normalized condition. It is well-suited for moderate-to-high torque transmission in CNC, robotics, and motor drive applications.\"\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\": \"45# steel is not inherently corrosion-resistant. For outdoor or high-humidity environments, apply a light coat of grease or anti-rust oil during installation and re-apply periodically.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I re-bore or add a keyway to the standard bore?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The plain bore is machinable on a lathe or mill. You can enlarge the bore to match your shaft diameter, cut a keyway, or drill and tap for a set screw.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the center distance between two meshing Module 3 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (Teeth on Gear 1 + Teeth on Gear 2) x Module \/ 2. For example, a 20-tooth pinion meshing with a 40-tooth gear: (20 + 40) x 3 \/ 2 = 90 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubricant should I use with these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general-purpose gear grease (NLGI Grade 1 or 2) or a light machine oil works well for most indoor applications. Apply lubricant to the tooth flanks during assembly and re-lubricate at regular service intervals.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3 Mod 12 Teeth \/ 1 Pcs","offer_id":52442402423058,"sku":"GLFBQLWJGJXCD1130x1","price":13.31,"currency_code":"USD","in_stock":true},{"title":"3 Mod 13 Teeth \/ 1 Pcs","offer_id":52442402455826,"sku":"GLFBQLWJGJXCD1131x1","price":16.99,"currency_code":"USD","in_stock":true},{"title":"3 Mod 14 Teeth \/ 1 Pcs","offer_id":52442402488594,"sku":"GLFBQLWJGJXCD1132x1","price":17.26,"currency_code":"USD","in_stock":true},{"title":"3 Mod 15 Teeth \/ 1 Pcs","offer_id":52442402521362,"sku":"GLFBQLWJGJXCD1133x1","price":20.74,"currency_code":"USD","in_stock":true},{"title":"3 Mod 16 Teeth \/ 1 Pcs","offer_id":52442402554130,"sku":"GLFBQLWJGJXCD1134x1","price":20.74,"currency_code":"USD","in_stock":true},{"title":"3 Mod 17 Teeth \/ 1 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