{"product_id":"1-module-spur-gears-45-150-teeth-45-steel-motor-transmission-gears-bore-6-30mm","title":"1 Module Spur Gears 45-150 Teeth 45# Steel Motor Transmission Gears Bore 6-30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 1 Spur Gears — Precision 45# Steel Transmission for Robotics \u0026amp; Motor Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a mismatched gear slips mid-run or a soft-metal tooth strips under load, the whole build stops. Engineers, hobbyist makers, and small-batch manufacturers who need a reliable, drop-in spur gear — sized exactly to their shaft — reach for a module 1 steel gear that holds tolerance under real operating conditions.\u003c\/p\u003e\n    \u003cp\u003eThese module 1 spur gears are machined from 45# medium-carbon steel and cover a wide tooth range from 45 T up to 150 T, with pitch circle diameters scaling proportionally (45 mm – 150 mm \/ approx. 1.77 in – 5.91 in). Bore options span 6 mm to 30 mm (approx. 0.24 in – 1.18 in) to suit common motor and shaft standards. Face width is typically 10–15 mm depending on tooth count; larger tooth counts use a stepped hub design (step heights of 40 mm or 70 mm noted in variant options).\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor gearbox assemblies for robotics and automation, CNC axis drive trains requiring consistent backlash control, and DIY power-transmission projects such as go-kart reducers, conveyor drives, and 3D-printer extruder upgrades where a standard module 1 spur gear with a keyed or set-screw bore is the fastest path to a working drivetrain.\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 Module 1 (1M) standard — meshes with any other Module 1 spur or rack gear. Verify bore diameter matches your shaft OD before ordering. Stepped-hub variants (120T \/ 150T) require clearance for the hub step height.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 1 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# Medium-Carbon Steel Construction\u003c\/strong\u003e — Heat-treatable alloy delivers solid tooth strength and wear resistance across continuous-duty motor drive applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range (45 T – 150 T)\u003c\/strong\u003e — A single product line covers small-ratio pinion pairings up to large reduction stages, reducing the need to source from multiple suppliers.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003ePrecision-Hobbed Tooth Profile\u003c\/strong\u003e — Module 1 involute tooth form ensures smooth mesh, predictable backlash, and interchangeability with any standard 1M mating gear or rack.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Options (6 – 30 mm)\u003c\/strong\u003e — Pre-bored to common shaft sizes; select the bore that matches your motor shaft or add a set-screw keyway in your own shop for a positive lock.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eStepped-Hub Design on Large Gears\u003c\/strong\u003e — 120 T and 150 T variants feature a machined hub step (40 mm or 70 mm) that simplifies axial positioning and reduces overhang on long shafts.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSold Individually or in Sets\u003c\/strong\u003e — Order exactly the quantity you need; single-piece pricing makes prototyping affordable while bulk quantities suit production runs.\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 1 Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (1M)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e45 T – 150 T (see variant options)\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\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e45 mm – 150 mm (1.77 in – 5.91 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 30 mm (see 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 Step Height\u003c\/th\u003e\n\u003ctd\u003e40 mm or 70 mm (120 T \u0026amp; 150 T variants only)\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\u003eTooth Form\u003c\/th\u003e\n\u003ctd\u003eInvolute, hobbed\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs (as 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 tooth count for my gear ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide the driven gear tooth count by the driver gear tooth count to get your reduction ratio. For example, pairing a 1M 45T pinion with a 1M 90T gear gives a 2:1 reduction. Select tooth counts that achieve your target ratio while keeping both gears within the physical space of your build.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Module 1 rack or pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All gears in this listing follow the standard Module 1 involute tooth profile with a 20° pressure angle, which is fully interchangeable with any other correctly manufactured 1M spur gear or rack regardless of brand.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I select the correct bore size?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft outer diameter with a caliper. Choose the bore option that matches — for example, a 6 mm shaft needs the 6 mm bore variant. If you need a keyway or set-screw flat, the bore can be machined further in your own shop after delivery.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under continuous load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel has a tensile strength of approximately 600–800 MPa in the normalized condition and can be further hardened. For high-torque or high-cycle applications, consider surface hardening the gear after machining any bore modifications. Actual load capacity depends on operating speed, lubrication, and mating gear quality.\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# steel is not inherently stainless. For outdoor or humid environments, apply a light machine oil, grease, or a zinc-phosphate coating after installation. For fully corrosion-resistant applications, consider stainless steel or nylon gears instead.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 120T step-40mm and step-70mm variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth are 120-tooth Module 1 gears, but the hub step height differs — 40 mm vs. 70 mm. The step height determines how far the gear body is offset from the mounting face. Choose the step height that provides the correct axial clearance for your shaft and housing geometry.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a 3D printer or CNC machine?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 1 spur gears are widely used in extruder drives, Z-axis lead-screw couplings, and CNC rotary axis assemblies. Verify that the bore matches your stepper or servo shaft, and confirm the tooth count gives you the desired step-per-mm or gear ratio for your motion system.\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 and Bore Size 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 gear ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the driven gear tooth count by the driver gear tooth count to get your reduction ratio. For example, pairing a 1M 45T pinion with a 1M 90T gear gives a 2:1 reduction.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Module 1 rack or pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All gears follow the standard Module 1 involute tooth profile with a 20° pressure angle, fully interchangeable with any correctly manufactured 1M spur gear or rack.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I select the correct bore size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft outer diameter with a caliper and choose the matching bore variant. The bore can be further machined for keyways or set-screw flats after delivery.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under continuous load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel has a tensile strength of approximately 600–800 MPa normalized. Actual load capacity depends on operating speed, lubrication, and mating gear quality.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel is not inherently stainless. Apply machine oil or grease after installation. For fully corrosion-resistant applications, consider stainless steel or nylon gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 120T step-40mm and step-70mm variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both are 120-tooth Module 1 gears with different hub step heights (40 mm vs. 70 mm), which determines axial offset from the mounting face. Choose based on your shaft and housing geometry.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 1 spur gears are widely used in extruder drives, Z-axis couplings, and CNC rotary axis assemblies. Verify bore size and tooth count for your motion system requirements.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1M 45T \/ 6mm \/ 1 Pcs","offer_id":52442753106194,"sku":"GLFBQLWGLBZSJ057596x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"1M 45T \/ 8mm \/ 1 Pcs","offer_id":52442753138962,"sku":"GLFBQLWGLBZSJ057597x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"1M 45T \/ 10mm \/ 1 Pcs","offer_id":52442753171730,"sku":"GLFBQLWGLBZSJ057598x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"1M 45T \/ 12mm \/ 1 Pcs","offer_id":52442753204498,"sku":"GLFBQLWGLBZSJ057599x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"1M 45T \/ 14mm \/ 1 Pcs","offer_id":52442753237266,"sku":"GLFBQLWGLCDPJ00966x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"1M 45T \/ 15mm \/ 1 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