{"product_id":"3-4-5-mod-10t-56t-spur-gear-45-steel-pinion-gear-thickness-3m-30mm-4m-35mm-40mm","title":"3\/4\/5 Mod 10T-56T Spur Gear 45# Steel Pinion Gear Thickness 3M-30mm 4M-35mm\/40mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3\/4\/5 Mod Spur Gear in 45# Steel — Precision Pinion Gears for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a motion-control build demands consistent tooth engagement and reliable torque transfer, undersized or poorly machined gears become the weak link. Engineers, makers, and machine builders working on CNC routers, robotic arms, conveyor drives, and automation rigs need spur gears that hold tight tolerances across the full operating range — these 45# steel pinion gears are designed exactly for that purpose.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-to-heavy drive applications. The range covers three module sizes — 3M (face width typically 30 mm \/ 1.18 in), 4M (face width typically 35–40 mm \/ 1.38–1.57 in), and 5M — with tooth counts spanning 10T through 56T, giving you fine control over gear ratio selection. Bore diameter and keyway dimensions vary by tooth count and module; see variant options for confirmed bore specs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: gear-rack linear drive systems for CNC gantries, stage-1 reduction stages in servo-driven robotic joints, and open-gear drive trains on light industrial conveyor equipment. The wide tooth-count range supports both high-speed low-torque and low-speed high-torque configurations within a single product family.\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 Designed for standard metric module gear systems. 3M gears mesh with other 3M-module racks, pinions, and gears; 4M with 4M; 5M with 5M. Confirm center distance and pressure angle (typically 20°) with your mating component before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Delivers the hardness needed for sustained mesh loads while remaining machinable for bore modifications if required by your application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Module Options (3M \/ 4M \/ 5M)\u003c\/strong\u003e — A single product family covers a broad range of gear-ratio and torque requirements; select the module that matches your mating rack or gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Tooth-Count Range (10T–56T)\u003c\/strong\u003e — Fine-tune your drive ratio without sourcing from multiple suppliers; tooth counts from 10T to 56T are stocked across all three modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Face Width per Module\u003c\/strong\u003e — 3M gears feature a face width of approximately 30 mm (1.18 in); 4M gears approximately 35–40 mm (1.38–1.57 in); 5M face width per variant options — ensuring predictable load distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 20° Pressure Angle\u003c\/strong\u003e — Compatible with the most widely used metric gear standards, simplifying integration into existing drive trains and reducing sourcing complexity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for CNC, Robotics \u0026amp; Conveyor Drives\u003c\/strong\u003e — Validated geometry for gear-rack linear motion, rotary reduction stages, and open-gear industrial drive applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Metric Module 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 Options\u003c\/th\u003e\n\u003ctd\u003e3M \/ 4M \/ 5M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 56T (varies by module; see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width — 3M\u003c\/th\u003e\n\u003ctd\u003eApproximately 30 mm (1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width — 4M\u003c\/th\u003e\n\u003ctd\u003eApproximately 35–40 mm (1.38–1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width — 5M\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard metric)\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\u003eMachined, natural steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs (per variant selected)\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 module (3M, 4M, or 5M) for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module must match your mating gear or rack exactly — a 3M pinion will only mesh correctly with a 3M rack or gear. As a general rule, higher module numbers indicate larger, stronger teeth suited to higher torque loads. Choose 3M for lighter-duty or space-constrained drives, 4M for medium-load applications, and 5M for heavier torque requirements. Always verify the module of your existing components before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count should I select for my gear ratio?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio is determined by dividing the driven gear tooth count by the driving pinion tooth count. For example, pairing a 10T pinion with a 40T gear gives a 4:1 reduction. With tooth counts from 10T to 56T available across all three modules, you can achieve a wide range of ratios. Calculate your required ratio first, then select the tooth count combination that fits your shaft center distance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears — can they handle continuous industrial loads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are machined from 45# medium-carbon steel, which provides a good balance of tensile strength and wear resistance for moderate-to-heavy drive applications. They are suitable for CNC routers, robotic joints, and light industrial conveyor drives under continuous operation. For very high shock loads or extreme-duty cycles, consider heat-treated or alloy-steel alternatives and consult a mechanical engineer for load calculations specific to your application.\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# carbon steel has limited inherent corrosion resistance. For outdoor, humid, or washdown environments, we recommend applying a suitable gear lubricant or grease to the tooth faces and bore, and considering a protective coating or periodic maintenance schedule. If corrosion resistance is a primary requirement, stainless steel or plastic gears may be more appropriate for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears fit my existing shaft — what are the bore dimensions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter and keyway dimensions vary by module and tooth count. Please refer to the variant options on this page or contact us to confirm the bore specification for your selected variant before ordering. If you need a custom bore size, the 45# steel material is machinable and can be bored to your required diameter by a local machine shop.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a 3M gear with a 4M rack or mix modules in my drive train?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo — gears of different modules are not interchangeable and will not mesh correctly. The module (tooth size) must be identical across all mating components in a gear pair or rack-and-pinion system. Mixing modules results in incorrect tooth engagement, accelerated wear, and potential drive failure. Always confirm that all components in your drive train share the same module.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pressure angle of these spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are manufactured to a standard 20° pressure angle, which is the most widely used metric gear standard globally. This ensures compatibility with the vast majority of metric racks, pinions, and gearboxes designed to DIN or ISO standards. If your application requires a 14.5° pressure angle, please contact us 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 and 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 module (3M, 4M, or 5M) for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module must match your mating gear or rack exactly. A 3M pinion will only mesh correctly with a 3M rack or gear. Choose 3M for lighter-duty drives, 4M for medium-load applications, and 5M for heavier torque requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tooth count should I select for my gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio equals driven gear tooth count divided by driving pinion tooth count. With 10T to 56T available across all three modules, you can achieve a wide range of ratios to fit your shaft center distance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears — can they handle continuous industrial loads?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are machined from 45# medium-carbon steel, suitable for CNC routers, robotic joints, and light industrial conveyor drives under continuous operation.\"\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# carbon steel has limited inherent corrosion resistance. Apply gear lubricant or grease for outdoor or humid environments, or consider stainless steel alternatives if corrosion resistance is a primary requirement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears fit my existing shaft — what are the bore dimensions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter and keyway dimensions vary by module and tooth count. Please refer to the variant options or contact us to confirm the bore specification for your selected variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a 3M gear with a 4M rack or mix modules in my drive train?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Gears of different modules are not interchangeable and will not mesh correctly. The module must be identical across all mating components in a gear pair or rack-and-pinion system.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pressure angle of these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are manufactured to a standard 20° pressure angle, compatible with the vast majority of metric racks, pinions, and gearboxes designed to DIN or ISO standards.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3M \/ 10T \/ 1 Pcs","offer_id":52442494402834,"sku":"GYZKJGLBZSJ058177x1","price":19.86,"currency_code":"USD","in_stock":true},{"title":"3M \/ 11T \/ 1 Pcs","offer_id":52442494435602,"sku":"GYZKJGLBZSJ058178x1","price":27.42,"currency_code":"USD","in_stock":true},{"title":"3M \/ 12T \/ 1 Pcs","offer_id":52442494468370,"sku":"GYZKJGLBZSJ058179x1","price":32.88,"currency_code":"USD","in_stock":true},{"title":"3M \/ 13T \/ 1 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