{"product_id":"1-1-5m-spur-gears-12t-100t-metal-transmission-gear-45-steel-1-mod-12-100-teeth","title":"1\/1.5M Spur Gears 12T-100T Metal Transmission Gear 45# Steel 1 Mod 12-100 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1 Mod \u0026amp; 1.5 Mod Spur Gears — Precision 45# Steel Transmission Components for CNC \u0026amp; Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or undersized gear stalls your CNC router, 3D printer, or robotics project mid-run, every minute of downtime costs you. Engineers, makers, and small-batch manufacturers who need reliable, dimensionally consistent motion-control parts turn to these 45# steel spur gears to keep their drives running without interruption.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# carbon steel and available in two module sizes — 1M (1 mod) and 1.5M (1.5 mod) — spanning 12 to 100 teeth. The 1M series features an outer diameter range of approximately 14 mm to 102 mm (0.55 in to 4.02 in), while the 1.5M series spans roughly 21 mm to 78 mm (0.83 in to 3.07 in) for the 12T–25T range. Bore diameter and keyway dimensions vary by tooth count; see variant options for exact figures.\u003c\/p\u003e\n    \u003cp\u003eThese spur gears are well-suited for CNC axis drives requiring precise gear-ratio control, DIY robotic arm joints where torque transmission accuracy matters, and light industrial conveyor or indexing mechanisms that demand repeatable positioning. Long-tail use cases include 1 mod gear replacement for RepRap-style extruders, 45 steel spur gear for laser engraver Y-axis, and 1.5 mod transmission gear for automated sliding gate openers.\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 systems. 1M gears mesh with other 1 mod spur, rack, or pinion components. 1.5M gears mesh with other 1.5 mod components. Verify bore diameter and keyway against your shaft spec 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    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e — Machined from medium-carbon 45# steel for a balance of hardness, toughness, and machinability that holds up under sustained rotational loads in CNC and automation applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range (12T–100T)\u003c\/strong\u003e — A single product line covers 12 to 100 teeth across 1M and 1.5M modules, letting you dial in the exact gear ratio your drive system requires without sourcing from multiple suppliers.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eStandard Metric Module Sizing\u003c\/strong\u003e — Conforms to standard 1 mod and 1.5 mod metric gear specifications, ensuring direct interchangeability with racks, pinions, and mating gears already in your build.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eConsistent Tooth Profile Accuracy\u003c\/strong\u003e — Involute tooth geometry is maintained across the full size range, delivering smooth meshing, reduced backlash, and predictable torque transfer in both low-speed and moderate-speed applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface Finish\u003c\/strong\u003e — The machined steel surface is suitable for light lubrication with standard gear oil or grease, extending service life in enclosed gearboxes and semi-exposed drive assemblies.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSold Individually by Gear Model\u003c\/strong\u003e — Each variant corresponds to a specific module and tooth count (e.g., 1M-20T, 1.5M-18T), so you order exactly what your BOM calls for — no surplus, no guesswork.\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 Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule Options\u003c\/th\u003e\n\u003ctd\u003e1M (1 mod), 1.5M (1.5 mod)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12T – 100T (1M series); 12T – 25T (1.5M series, listed variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard involute)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (1M)\u003c\/th\u003e\n\u003ctd\u003eApprox. 14 mm – 102 mm (0.55 in – 4.02 in); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (1.5M)\u003c\/th\u003e\n\u003ctd\u003eApprox. 21 mm – 40.5 mm (0.83 in – 1.59 in) for 12T–25T; see variant options\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\u003eHub \/ Face Width\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 steel, suitable for oil\/grease lubrication\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece 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    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between 1M and 1.5M module gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module (M) defines the tooth size and pitch. A 1M gear has smaller teeth than a 1.5M gear of the same tooth count, making 1M suitable for lighter loads and compact drives (e.g., 3D printer extruders, small CNC axes), while 1.5M handles moderate torque applications like robotic joints or gate openers. Both modules must be matched — a 1M gear will not mesh correctly with a 1.5M gear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tooth count should I select for my target gear ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the driven gear tooth count by the driving gear tooth count to get your ratio. For example, pairing a 1M-20T pinion with a 1M-40T gear gives a 2:1 reduction. Use our full 12T–100T range to fine-tune ratios without custom machining. If you need both gears, add each variant separately to your cart.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for CNC router or laser engraver axis drives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel offers a tensile strength of approximately 600–700 MPa, making it appropriate for light-to-medium duty CNC and laser engraver axis applications at typical hobby and small-shop feed rates. For heavy-duty industrial cutting with high continuous torque, consider specifying your load requirements and consulting the gear's rated torque capacity based on face width and module.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears rust or corrode in a workshop environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel is not stainless and will oxidize if left unprotected in humid environments. Applying a light coat of gear oil, grease, or a rust-inhibiting spray is recommended, especially for gears in semi-exposed or outdoor-adjacent installations. For fully enclosed gearboxes with regular lubrication, corrosion is not typically a concern under normal workshop conditions.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I confirm the bore diameter fits my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and module. Please refer to the variant detail page or contact us to confirm the bore size for your specific Gear Model selection before ordering. If your shaft requires a custom bore or keyway, the 45# steel material is readily machinable by a local machine shop.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these spur gears with a rack and pinion system?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Standard metric racks in matching module (1M rack with 1M gear, 1.5M rack with 1.5M gear) will mesh correctly with these spur gears. Ensure the rack's pressure angle is also 20° to match the involute tooth profile of these gears. This makes them a practical choice for CNC gantry drives, linear actuators, and sliding gate mechanisms.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these sold as a set or individually?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach order is for one (1) individual gear corresponding to the Gear Model variant you select (e.g., 1M-20T = one 1 mod, 20-tooth gear). If your project requires a mating gear or multiple sizes, add each variant separately. Quantity pricing is not automatically applied — contact us for bulk order inquiries.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your Gear 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 between 1M and 1.5M module gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module (M) defines the tooth size and pitch. A 1M gear has smaller teeth than a 1.5M gear of the same tooth count, making 1M suitable for lighter loads and compact drives, while 1.5M handles moderate torque applications. Both modules must be matched — a 1M gear will not mesh correctly with a 1.5M gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tooth count should I select for my target gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear tooth count by the driving gear tooth count to get your ratio. For example, pairing a 1M-20T pinion with a 1M-40T gear gives a 2:1 reduction. Use the full 12T–100T range to fine-tune ratios without custom machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for CNC router or laser engraver axis drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel offers a tensile strength of approximately 600–700 MPa, making it appropriate for light-to-medium duty CNC and laser engraver axis applications at typical hobby and small-shop feed rates.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears rust or corrode in a workshop environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel is not stainless and will oxidize if left unprotected in humid environments. Applying a light coat of gear oil, grease, or a rust-inhibiting spray is recommended. For fully enclosed gearboxes with regular lubrication, corrosion is not typically a concern.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the bore diameter fits my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count and module. Please refer to the variant detail page or contact us to confirm the bore size for your specific Gear Model selection before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these spur gears with a rack and pinion system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Standard metric racks in matching module (1M rack with 1M gear, 1.5M rack with 1.5M gear) will mesh correctly with these spur gears. Ensure the rack's pressure angle is also 20° to match the involute tooth profile.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these sold as a set or individually?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order is for one (1) individual gear corresponding to the Gear Model variant you select. If your project requires a mating gear or multiple sizes, add each variant separately.\"\n      }\n    }\n  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