{"product_id":"3-mod-45-steel-spur-gears-30mm-thick-10-53-teeth-36-165mm-od-transmission-gear","title":"3 Mod 45# Steel Spur Gears 30mm Thick 10-53 Teeth 36-165mm OD Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 3 Spur Gears in 45# Steel — Precise Power Transmission for Demanding Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a gear slips, strips, or runs rough under load, the whole machine pays the price. Engineers, machinists, and serious hobbyists building CNC routers, robotic arms, conveyor systems, or custom gearboxes need a spur gear that holds its tooth profile under real torque — not one that deforms after a few hundred hours. These Module 3 spur gears are machined from 45# medium-carbon steel and sized for applications where dimensional accuracy and material toughness both matter.\u003c\/p\u003e\n    \u003cp\u003eEach gear is a single-piece 45# carbon steel spur gear with a Module (pitch) of 3, a face width of 30 mm (approximately 1.18 in), and an outer diameter ranging from 36 mm (10 teeth) to 165 mm (53 teeth) — approximately 1.42 in to 6.50 in. Bore diameter varies by tooth count; see variant options for exact bore dimensions. The tooth profile follows standard involute geometry for smooth meshing with any mating Module 3 gear.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include open-frame CNC axis drives where a rack-and-pinion or gear-pair arrangement replaces a belt, rotary indexing tables in light machining fixtures, and custom speed-reduction stages in robotics or automation projects requiring a compact, rigid gear mesh.\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 spur or helical gear. Verify bore diameter and keyway requirements against your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 3 Steel Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e — Medium-carbon steel delivers a tensile strength typically in the 600–800 MPa range, resisting tooth deformation under sustained radial and tangential loads without the brittleness of hardened tool steel.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 3 Involute Tooth Profile\u003c\/strong\u003e — Standard M3 geometry ensures accurate, low-noise meshing with any mating Module 3 gear. Consistent pitch across the full 10–53 tooth range means you can mix tooth counts within the same drive train.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003e30 mm Face Width for Increased Load Capacity\u003c\/strong\u003e — A 30 mm (1.18 in) face width distributes tooth load across a wider contact band compared to thinner gears, reducing surface stress and extending service life in continuous-duty applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range: 10–53 Teeth\u003c\/strong\u003e — Outer diameters from 36 mm to 165 mm let you dial in the exact gear ratio and center distance your design requires without custom machining.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eMachined Bore Ready for Shaft Fitting\u003c\/strong\u003e — Each gear ships with a machined center bore. Bore diameter varies by tooth count (see variant options). Standard keyway or set-screw modifications can be applied by the end user as needed.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eSuited for CNC, Robotics \u0026amp; Industrial Drives\u003c\/strong\u003e — Whether you are building a rack-and-pinion CNC axis, a rotary indexing stage, or a multi-stage speed reducer, these gears provide the dimensional consistency and material integrity that repeatable mechanical performance demands.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 3 Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\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\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e3\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\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e10 – 53 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e36 mm – 165 mm (1.42 in – 6.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e30 mm (1.18 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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard Involute\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\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs 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\u003eThe tooth count determines both the gear ratio and the center distance between shafts. For a given gear ratio, divide the driven gear teeth by the driver gear teeth. Center distance equals (T1 + T2) × Module \/ 2, where T1 and T2 are the tooth counts of the two mating gears. Use the 36–165 mm OD range listed in the variants to confirm the gear physically fits your housing before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load can these gears handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has a typical tensile strength of 600–800 MPa. The 30 mm face width distributes tooth load across a wider contact area than thinner gears. Actual load capacity depends on operating speed, lubrication, and duty cycle. For continuous high-torque applications, consult standard gear-strength calculations (AGMA or ISO 6336) using the module, face width, and material properties provided.\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 is not inherently corrosion resistant. For outdoor, humid, or washdown environments, apply a suitable lubricant or protective coating after installation. If corrosion resistance is a primary requirement, 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\u003eWill these mesh with my existing Module 3 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any two gears with the same module and pressure angle will mesh correctly regardless of tooth count or manufacturer. These gears use standard Module 3 \/ 20° pressure angle involute geometry, so they are interchangeable with other Module 3 spur gears. Confirm the center distance calculation matches your housing before assembly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the bore diameter, and can I modify it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count — please refer to the variant options or contact us to confirm the bore for your selected tooth count. The bore can be enlarged by a machinist using a lathe or boring bar. Keyways and set-screw holes can also be added by a machine shop if your shaft requires them.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to lubricate these gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Carbon steel spur gears running under load require lubrication to reduce friction, prevent surface fatigue, and manage heat. A light gear oil or grease appropriate for the operating speed and load is recommended. Re-lubricate at regular intervals based on your duty cycle and operating environment.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use a single gear from this listing as a replacement part?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each variant is sold as 1 piece (1 Pcs), so you can order exactly the tooth count you need as a direct replacement. Match the module (3), pressure angle (20°), face width (30 mm), and tooth count to your existing gear to ensure a drop-in fit.\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 (Number of Teeth) 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 both the gear ratio and the center distance between shafts. Center distance equals (T1 + T2) × Module \/ 2. Use the 36–165 mm OD range listed in the variants to confirm the gear physically fits your housing before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load can these gears handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has a typical tensile strength of 600–800 MPa. The 30 mm face width distributes tooth load across a wider contact area. Actual load capacity depends on operating speed, lubrication, and duty cycle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion resistant. For outdoor or humid environments, apply a suitable lubricant or protective coating after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these mesh with my existing Module 3 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These gears use standard Module 3 \/ 20° pressure angle involute geometry and are interchangeable with any other Module 3 spur gears. Confirm the center distance calculation matches your housing before assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the bore diameter, and can I modify it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count — refer to the variant options or contact us to confirm. The bore can be enlarged by a machinist, and keyways or set-screw holes can be added if needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate these gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Carbon steel spur gears require lubrication to reduce friction and manage heat. Use a light gear oil or grease appropriate for your operating speed and load.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a single gear from this listing as a replacement part?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each variant is sold as 1 piece. Match the module (3), pressure angle (20°), face width (30 mm), and tooth count to your existing gear for a drop-in fit.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3M \/ 10 Teeth \/ 1 Pcs","offer_id":52442325025042,"sku":"QTLJGLBZSJ058177x1","price":21.71,"currency_code":"USD","in_stock":true},{"title":"3M \/ 11 Teeth \/ 1 Pcs","offer_id":52442325057810,"sku":"QTLJGLBZSJ058178x1","price":23.07,"currency_code":"USD","in_stock":true},{"title":"3M \/ 12 Teeth \/ 1 Pcs","offer_id":52442325090578,"sku":"QTLJGLBZSJ058179x1","price":26.36,"currency_code":"USD","in_stock":true},{"title":"3M \/ 13 Teeth \/ 1 Pcs","offer_id":52442325123346,"sku":"QTLJGLBZSJ058180x1","price":33.32,"currency_code":"USD","in_stock":true},{"title":"3M \/ 14 Teeth \/ 1 Pcs","offer_id":52442325156114,"sku":"QTLJGLBZSJ058181x1","price":34.44,"currency_code":"USD","in_stock":true},{"title":"3M \/ 15 Teeth \/ 1 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