{"product_id":"spur-gear-45-steel-transmission-gear-1-5-2-mod-12-27-teeth-with-step-motor-gear","title":"Spur Gear 45# Steel Transmission Gear 1.5\/2 Mod 12-27 Teeth With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e45# Steel Spur Gear — Precision Transmission for DIY Automation \u0026amp; CNC Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control project demands reliable torque transfer without backlash surprises, finding a spur gear that matches your shaft exactly can be a frustrating hunt. Hobbyists, makers, and small-workshop engineers building CNC routers, robotic arms, or custom conveyor systems need gears that are dimensionally consistent, easy to mount, and tough enough for continuous duty — not parts that arrive undersized or with sloppy bores.\u003c\/p\u003e\n\u003cp\u003eThese spur gears are machined from 45# medium-carbon steel, offering a solid balance of strength and machinability. Available in two module sizes — 1.5 Mod and 2 Mod — with tooth counts ranging from 12 to 27 teeth, and bore diameters spanning 6 mm (~0.24 in) to 25 mm (~0.98 in). Keyway variants (4 mm, 5 mm, and 6 mm keyways) are available for larger bores to ensure positive shaft engagement without set-screw slip.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper-motor drive stages in desktop CNC machines, gear-reduction assemblies in educational robotics kits, and indexing mechanisms in small automated feeders — anywhere a compact, metric-pitch spur gear with a precise bore is required.\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 metric module (Mod) gear systems. 1.5 Mod gears mesh with other 1.5 Mod gears; 2 Mod gears mesh with other 2 Mod gears. Verify module, pressure angle (typically 20°), and bore diameter 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-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# steel for reliable tensile strength and wear resistance in continuous-duty drive applications.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eDual Module Options — 1.5 Mod \u0026amp; 2 Mod\u003c\/strong\u003e\u003cbr\u003eTwo module sizes cover a wide range of gear-ratio and torque requirements, from compact stepper drives to heavier reduction stages.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range: 12–27 Teeth\u003c\/strong\u003e\u003cbr\u003eSelect the exact tooth count to achieve your target gear ratio without resorting to custom machining.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Diameters with Keyway Options\u003c\/strong\u003e\u003cbr\u003eBore sizes from 6 mm to 25 mm; larger bores available with precision-cut keyways (4 mm, 5 mm, or 6 mm) for positive shaft locking.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eStep-Motor Ready Hub Geometry\u003c\/strong\u003e\u003cbr\u003eHub dimensions are sized to suit common NEMA stepper motor shaft diameters, simplifying integration into CNC and automation builds.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSold Individually — Mix \u0026amp; Match Variants\u003c\/strong\u003e\u003cbr\u003eEach listing covers a single gear; order the exact module, tooth count, and bore combination you need without paying for parts you won't use.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 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 (Mod)\u003c\/th\u003e\n\u003ctd\u003e1.5 Mod \/ 2 Mod (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e12 – 27 Teeth (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eAvailable on select bore sizes: 4 mm, 5 mm, 6 mm, 8 mm keyways\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\u003ePitch Diameter (1.5 Mod)\u003c\/th\u003e\n\u003ctd\u003e18 mm – 40.5 mm (Mod × Teeth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (2 Mod)\u003c\/th\u003e\n\u003ctd\u003e24 mm – 48 mm (Mod × Teeth)\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\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\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 1.5 Mod and 2 Mod?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the ratio of pitch diameter to tooth count. A higher module means larger, stronger teeth. Use 1.5 Mod for lighter loads and compact assemblies (e.g., small CNC axes, desktop robots). Use 2 Mod when you need to transmit more torque or when gear size is less of a constraint. Both gears in a meshing pair must share the same module.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I select for my stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore to your motor's shaft diameter. Common NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm or 8 mm. If your shaft diameter falls between standard bore sizes, choose the next size up and use a set screw or keyway to secure the gear. For shafts 12 mm and above, keyway variants are available for a more positive drive connection.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for continuous-duty use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel provides a good balance of tensile strength (typically 600–800 MPa) and machinability, making it suitable for moderate continuous-duty applications such as CNC drive stages, conveyor indexers, and robotic joints. For very high-load or high-speed applications, consider whether surface hardening or a higher-alloy steel would be more appropriate for your specific torque and RPM requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these gears resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance. For indoor, dry environments this is generally adequate. If your application involves moisture, coolant, or outdoor exposure, we recommend applying a light machine oil or grease coating, or considering a stainless-steel alternative for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill a 1.5 Mod gear mesh with a 2 Mod gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. Gears must share the same module to mesh correctly. Mixing modules results in incorrect tooth engagement, excessive noise, accelerated wear, and potential gear failure. Always confirm that all gears in your drive train share the same module value.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is a keyway and do I need one?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA keyway is a rectangular slot machined into the bore that accepts a matching key inserted into the shaft. This creates a positive mechanical lock that prevents the gear from rotating on the shaft under load — unlike a set screw alone, which can loosen over time. If your application involves reversing loads, high torque, or vibration, a keyway variant is strongly recommended for bores 12 mm and above.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the gear ratio for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio = (Teeth on driven gear) ÷ (Teeth on driving gear). For example, pairing a 12-tooth drive gear with a 24-tooth driven gear gives a 2:1 reduction — the output shaft turns at half the speed but with twice the torque. Use this formula to select the tooth-count combination that achieves your target speed and torque output.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Model (Mod \u0026amp; Teeth) and Bore Diameter 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 1.5 Mod and 2 Mod?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module (Mod) is the ratio of pitch diameter to tooth count. A higher module means larger, stronger teeth. Use 1.5 Mod for lighter loads and compact assemblies. Use 2 Mod when you need to transmit more torque. Both gears in a meshing pair must share the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore to your motor's shaft diameter. Common NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm or 8 mm. For shafts 12 mm and above, keyway variants are available for a more positive drive connection.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel provides tensile strength typically 600–800 MPa, suitable for moderate continuous-duty applications such as CNC drive stages, conveyor indexers, and robotic joints.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears resist corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has moderate corrosion resistance, adequate for indoor dry environments. For moisture or outdoor exposure, apply a light machine oil or grease coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 1.5 Mod gear mesh with a 2 Mod gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Gears must share the same module to mesh correctly. Mixing modules results in incorrect tooth engagement, excessive noise, and accelerated wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a keyway and do I need one?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A keyway is a rectangular slot machined into the bore that accepts a matching key on the shaft, creating a positive mechanical lock. Recommended for reversing loads, high torque, or vibration applications on bores 12 mm and above.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the gear ratio for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio = Teeth on driven gear ÷ Teeth on driving gear. For example, a 12-tooth drive gear with a 24-tooth driven gear gives a 2:1 reduction — half the speed, twice the torque.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Mod 12 Teeth \/ 6mm","offer_id":52443075084562,"sku":"GLFBBYWJGJXCD0432x1","price":13.46,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod 12 Teeth \/ 8mm","offer_id":52443075117330,"sku":"GLFBBYWJGJXCD0433x1","price":13.46,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod 14 Teeth \/ 6mm","offer_id":52443075150098,"sku":"GLFBBYWJGJXCD0434x1","price":13.46,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod 14 Teeth \/ 8mm","offer_id":52443075182866,"sku":"GLFBBYWJGJXCD0435x1","price":13.46,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod 15 Teeth \/ 6mm","offer_id":52443075215634,"sku":"GLFBBYWJGJXCD0436x1","price":12.32,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod 15 Teeth \/ 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