{"product_id":"2-5-mod-spur-gears-pitch-7-85mm-45-steel-pinion-motor-gear-25mm-thick","title":"2.5 Mod 12T-75T Spur Gears pitch 7.85mm 45# Steel Pinion Motor Gear Thick 25mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e2.5 Mod Spur Gears — Precision 45# Steel Pinion Gears for Reliable Motion Control\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, robotic arm, or automation drive train demands consistent torque transfer without slippage or premature wear, the gear material and tooth geometry make all the difference. Engineers, makers, and machine builders who rely on metric spur gears need components that hold tight tolerances across thousands of operating cycles — these 2.5 modulus spur gears are machined to meet that standard.\u003c\/p\u003e\n\u003cp\u003eEach gear is manufactured from 45# medium-carbon steel, offering a balanced combination of machinability and mechanical strength. The module is 2.5 (pitch diameter = module × tooth count), with a circular pitch of approximately 7.85 mm (~0.309 in). Tooth count options span from 12T to 100T, and every gear in this series features a uniform face width (thickness) of 25 mm (~0.984 in). Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: CNC gantry and rack-and-pinion drive systems requiring repeatable positioning; robotic joint actuators where compact gear reduction is needed; industrial conveyor and indexing mechanisms using metric gear trains; and DIY automation projects pairing these pinion gears with matching 2.5 mod rack sections or mating spur gears.\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 to mesh with all standard Module 2.5 (Mod 2.5) spur gears and racks. Pressure angle: 20°. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 2.5 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Delivers the tensile strength and surface hardness needed for sustained load-bearing in drive and reduction gear applications, with better wear resistance than mild steel alternatives.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eModule 2.5 \/ 7.85 mm Circular Pitch\u003c\/strong\u003e — Conforms to the ISO metric gear standard, ensuring accurate meshing with any Mod 2.5 mating gear or rack. Pitch diameter scales linearly with tooth count (PD = 2.5 × T mm).\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e25 mm Uniform Face Width\u003c\/strong\u003e — A consistent 25 mm (~0.984 in) tooth thickness across the entire range provides stable load distribution and simplifies gear train alignment in multi-stage assemblies.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔢\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Tooth Count Selection (12T – 100T)\u003c\/strong\u003e — Choose from 12 to 100 teeth in a single product listing to achieve your target gear ratio without sourcing from multiple suppliers.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e20° Pressure Angle for Smooth Engagement\u003c\/strong\u003e — The standard 20° involute tooth profile minimizes backlash and noise while maximizing load-carrying capacity across the full tooth contact zone.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMachined Bore with Keyway\u003c\/strong\u003e — Each gear includes a machined center bore sized to the tooth count, with a keyway slot for positive shaft locking. Confirm bore diameter against your shaft diameter before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 2.5 Mod Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2.5\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\u003eCircular Pitch\u003c\/th\u003e\n\u003ctd\u003e7.85 mm (~0.309 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12T – 100T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width (Thickness)\u003c\/th\u003e\n\u003ctd\u003e25 mm (~0.984 in)\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\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\u003eIncluded (dimensions vary by tooth count)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter Formula\u003c\/th\u003e\n\u003ctd\u003ePD = Module × Tooth Count (mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter Formula\u003c\/th\u003e\n\u003ctd\u003eOD = Module × (Tooth Count + 2) (mm)\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 pc\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 select the correct 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 20T pinion with a 60T gear gives a 3:1 reduction. Use the pitch diameter formula (PD = 2.5 × T) to verify center distance: center distance = (PD₁ + PD₂) \/ 2.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of 45# steel, and is it strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition. It is well-suited for moderate-to-high load gear applications such as CNC drives, robotic joints, and industrial indexing. For very high-shock or high-speed applications, consider whether a heat-treated or alloy steel variant is required.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during operation, or consider adding a protective surface treatment. These gears are designed for enclosed or lubricated drive systems.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these mesh with my existing Mod 2.5 rack or spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with Module 2.5 and a 20° pressure angle will mesh correctly with this series. Verify that the face width of your mating component is compatible (25 mm or wider) and that the center distance matches the calculated value based on pitch diameters.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the bore diameter fits my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count in this series. Check the product images or contact us to confirm the exact bore size for your selected tooth count before ordering. The keyway slot allows a key to be used for positive torque transmission — match the key dimensions to your shaft's keyway spec.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a multi-stage gear train?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Because all gears in this listing share the same module (2.5) and pressure angle (20°), they can be combined in multi-stage configurations. Calculate the center distance for each stage using the pitch diameter formula, and ensure adequate shaft support and alignment for each mesh point.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication is recommended for these spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA light gear oil (ISO VG 68–150) or lithium-based grease is suitable for most applications. For low-speed, high-load applications, use a heavier grease. For high-speed applications, a splash or drip oil lubrication system is recommended to maintain the oil film across the tooth contact zone.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your tooth number 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 select the correct 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 20T pinion with a 60T gear gives a 3:1 reduction. Use the pitch diameter formula (PD = 2.5 × T) to verify center distance: center distance = (PD₁ + PD₂) \/ 2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of 45# steel, and is it strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa in the normalized condition. It is well-suited for moderate-to-high load gear applications such as CNC drives, robotic joints, and industrial indexing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during operation, or consider adding a protective surface treatment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these mesh with my existing Mod 2.5 rack or spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with Module 2.5 and a 20° pressure angle will mesh correctly with this series. Verify that the face width of your mating component is compatible (25 mm or wider) and that the center distance matches the calculated value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the bore diameter fits my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count in this series. Check the product images or contact us to confirm the exact bore size for your selected tooth count before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a multi-stage gear train?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Because all gears in this listing share the same module (2.5) and pressure angle (20°), they can be combined in multi-stage configurations. Calculate the center distance for each stage using the pitch diameter formula.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication is recommended for these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A light gear oil (ISO VG 68–150) or lithium-based grease is suitable for most applications. For high-speed applications, a splash or drip oil lubrication system is recommended.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5 Modulus 12Tooth \/ 1pcs","offer_id":52442630816018,"sku":"FXLJGJXCD1407x1","price":23.36,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus 13Tooth \/ 1pcs","offer_id":52442630848786,"sku":"FXLJGJXCD1408x1","price":23.36,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus 14Tooth \/ 1pcs","offer_id":52442630881554,"sku":"FXLJGJXCD1409x1","price":23.64,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus 15Tooth \/ 1pcs","offer_id":52442630914322,"sku":"FXLJGJXCD1410x1","price":32.5,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus 16Tooth \/ 1pcs","offer_id":52442630947090,"sku":"FXLJGJXCD1411x1","price":32.88,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus 17Tooth \/ 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