{"product_id":"2-mod-45-steel-spur-gear-10-24t-bore-8-25mm-pinion-gear-with-step-motor-gear","title":"2 Mod 45# Steel Spur Gear 10-24T Bore 8-25mm Pinion Gear with Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2 Mod 45# Steel Spur Gear — Precision Pinion Gear for Stepper Motors \u0026amp; DIY Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen your CNC router stalls mid-cut or your stepper motor drive slips under load, the culprit is almost always a weak or mismatched gear. Makers, robotics builders, and mechanical engineers who need a reliable, drop-in Module 2 spur gear will find this 45# carbon steel pinion gear engineered to handle real torque without play or premature wear.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel and finished with a blackened oxide surface for corrosion resistance. The range covers 12 to 24 teeth (12T–24T) with an outer diameter that scales proportionally per Module 2 geometry (OD = (T + 2) × 2 mm, typically 28–52 mm \/ 1.10–2.05 in). Bore options span 8 mm to 25 mm; larger bores (12 mm and above) include a precision-cut keyway (4 mm or 5 mm or 6 mm or 8 mm depending on bore size) for positive shaft locking.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include stepper motor pinion drives in CNC machines and 3D printer extruder gearboxes, reduction gear trains in robotic arms and automated conveyor systems, and replacement gears for DIY go-karts, winches, and small industrial drives where a Module 2 standard pitch is specified.\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 Module 2 (Mod 2) spur or helical gear of the same modulus. Verify shaft diameter and keyway dimensions against your variant selection before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 2 Mod 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\n        \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from medium-carbon 45# steel for a balance of hardness and toughness, resisting tooth deformation under sustained radial and tangential loads.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eModule 2 Standard Pitch\u003c\/strong\u003e\n        \u003cp\u003eTrue Mod 2 geometry ensures accurate meshing with any compatible Module 2 gear — no backlash shimming required when paired correctly.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range (12T–24T)\u003c\/strong\u003e\n        \u003cp\u003eThirteen tooth-count options let you dial in your exact gear ratio for stepper motor drives, reduction stages, or direct-drive pinion applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore \u0026amp; Keyway Options\u003c\/strong\u003e\n        \u003cp\u003eBore diameters from 8 mm to 25 mm, with precision keyways on 12 mm+ bores (4–8 mm keyway width), provide a positive, slip-free shaft connection.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eBlackened Oxide Surface Finish\u003c\/strong\u003e\n        \u003cp\u003eThe oxide treatment adds a layer of corrosion resistance and reduces light reflection — suitable for indoor mechanical assemblies and light-duty outdoor enclosures.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eStepper Motor Ready\u003c\/strong\u003e\n        \u003cp\u003eBore and keyway dimensions are sized to fit common NEMA 17, NEMA 23, and equivalent stepper motor shaft diameters, making these gears a direct fit for CNC and robotics builds.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 2 Spur Gear\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlackened Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eModulus (Module)\u003c\/th\u003e\n\u003ctd\u003e2 (Mod 2)\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\u003e12T – 24T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e(T + 2) × 2 mm — typically 28–52 mm (1.10–2.05 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e4 mm (12 mm bore) \/ 5 mm (14–17 mm bore) \/ 6 mm (18–20 mm bore) \/ 8 mm (22–25 mm bore) — plain bore for 8 \u0026amp; 10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Width \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC drives, stepper motor gearboxes, robotics, DIY mechanical drives\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\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right number of teeth for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 12T pinion with a 24T gear gives a 2:1 reduction. Choose a lower tooth count for higher speed output and a higher tooth count for more torque. Always verify that the center distance between shafts matches the sum of the two gears' pitch radii: center distance = (T₁ + T₂) × Module \/ 2.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size should I select for my stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter precisely with calipers. Common stepper motor shaft diameters are 5 mm (NEMA 17 small), 6.35 mm, 8 mm (NEMA 17 standard), 10 mm, and 12–14 mm (NEMA 23). Select the bore that matches your shaft. For shafts 12 mm and above, the included keyway provides a positive lock — pair it with a matching key stock for zero-slip transmission.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears strong enough for CNC router and 3D printer drives?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel offers a tensile strength of approximately 600–800 MPa after standard heat treatment, making it well-suited for the moderate loads found in CNC router axis drives, 3D printer extruder gearboxes, and similar light-to-medium industrial applications. For very high-cycle or heavy-load environments, consider whether a hardened or case-hardened gear grade is required for your specific duty cycle.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh correctly with my existing Module 2 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any two gears of the same module and pressure angle will mesh correctly regardless of tooth count. These gears use Module 2 with a standard 20° pressure angle, which is the most common metric spur gear standard. Confirm your existing gear's module (often stamped on the hub or listed in its datasheet) before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow corrosion-resistant is the blackened oxide finish?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides mild corrosion resistance suitable for dry or lightly oiled indoor environments. It is not a substitute for galvanizing or stainless steel in wet, outdoor, or chemically aggressive conditions. For best results, apply a light machine oil or grease to the gear teeth and bore during installation and re-lubricate periodically.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears without a keyway (plain bore variants)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 8 mm and 10 mm bore variants are plain bore (no keyway). They can be secured to a shaft using a set screw through the hub, a press fit, or a shaft collar. For applications with reversing loads or high torque, a keyed bore variant is recommended to prevent rotational slippage.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the outer diameter of the gear I need?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a Module 2 spur gear, the outer diameter (addendum circle diameter) is calculated as: OD = (Number of Teeth + 2) × Module. For example, a 20T Mod 2 gear has an OD of (20 + 2) × 2 = 44 mm (approximately 1.73 in). Use this formula to verify the gear will fit within your housing or clearance envelope 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 Modulus, Number of 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 the right number of teeth for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 12T pinion with a 24T gear gives a 2:1 reduction. Choose a lower tooth count for higher speed output and a higher tooth count for more torque. Always verify that the center distance between shafts matches the sum of the two gears' pitch radii: center distance = (T1 + T2) × Module \/ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter precisely with calipers. Common stepper motor shaft diameters are 5 mm (NEMA 17 small), 6.35 mm, 8 mm (NEMA 17 standard), 10 mm, and 12–14 mm (NEMA 23). Select the bore that matches your shaft. For shafts 12 mm and above, the included keyway provides a positive lock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for CNC router and 3D printer drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel offers a tensile strength of approximately 600–800 MPa after standard heat treatment, making it well-suited for the moderate loads found in CNC router axis drives, 3D printer extruder gearboxes, and similar light-to-medium industrial applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh correctly with my existing Module 2 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any two gears of the same module and pressure angle will mesh correctly regardless of tooth count. These gears use Module 2 with a standard 20° pressure angle, which is the most common metric spur gear standard.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How corrosion-resistant is the blackened oxide finish?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides mild corrosion resistance suitable for dry or lightly oiled indoor environments. It is not a substitute for galvanizing or stainless steel in wet, outdoor, or chemically aggressive conditions. Apply a light machine oil or grease during installation and re-lubricate periodically.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears without a keyway (plain bore variants)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 8 mm and 10 mm bore variants are plain bore (no keyway). They can be secured using a set screw, press fit, or shaft collar. For reversing loads or high torque, a keyed bore variant is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the outer diameter of the gear I need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a Module 2 spur gear: OD = (Number of Teeth + 2) × Module. For example, a 20T Mod 2 gear has an OD of (20 + 2) × 2 = 44 mm (approximately 1.73 in).\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2 Mod \/ 12T \/ Bore 8mm","offer_id":52442327941394,"sku":"QTLJJGJXCD0510x1","price":17.27,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 12T \/ Bore 10mm","offer_id":52442327974162,"sku":"QTLJJGJXCD0511x1","price":17.27,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 13T \/ Bore 8mm","offer_id":52442328006930,"sku":"QTLJJGJXCD0512x1","price":18.58,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 13T \/ Bore 10mm","offer_id":52442328039698,"sku":"QTLJJGJXCD0513x1","price":18.58,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 14T \/ Bore 8mm","offer_id":52442328072466,"sku":"QTLJJGJXCD0514x1","price":19.86,"currency_code":"USD","in_stock":true},{"title":"2 Mod \/ 14T \/ Bore 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