{"product_id":"2-5-mod-15t-32t-precision-spur-pinion-gear-with-step-45-steel-motor-gear","title":"2.5 Mod 15T - 32T Precision Spur Pinion Gear With Step 45# Steel Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e2.5 Mod Spur Pinion Gear — Precision 45# Steel Motor Gear for CNC \u0026amp; Automation\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control build demands tight tolerances and reliable torque transfer, a poorly matched gear becomes the weakest link in the chain. Engineers, robotics builders, and CNC hobbyists who need a dependable 2.5 modulus spur pinion gear will find this stepped-hub design eliminates shaft slippage and simplifies motor coupling across a wide range of drive configurations.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# carbon steel, offering a solid balance of hardness and machinability. The stepped hub design allows the gear to seat flush against motor flanges or bearing housings. Tooth counts range from 15T to 32T, with bore diameters from 12 mm (0.47 in) up to 40 mm (1.57 in) and matching keyway slots from 4 mm to 12 mm to lock the gear firmly to the shaft.\u003c\/p\u003e\n    \u003cp\u003eThese 2.5 mod pinion gears are well-suited for DIY CNC router Z-axis drives, stepper motor gear reduction stages in 3D printer extruder assemblies, and light industrial conveyor or actuator systems where a compact spur gear pair is needed for precise linear or rotary motion control.\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 use with 2.5 modulus mating spur gears. Verify bore diameter and keyway dimensions match your motor shaft before ordering. \"Process Hole\" variants require finish boring to your target diameter.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 2.5 Mod Spur Pinion Gears\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n      \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eMachined from 45# carbon steel for reliable hardness, wear resistance, and dimensional stability under continuous load in motor drive applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n      \u003cstrong\u003e2.5 Modulus Precision Tooth Profile\u003c\/strong\u003e\n      \u003cp\u003eStandard 2.5 mod tooth geometry ensures smooth meshing with compatible mating gears, minimizing backlash and noise in CNC and automation builds.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n      \u003cstrong\u003eKeyway Bore Options\u003c\/strong\u003e\n      \u003cp\u003eAvailable with pre-cut keyway slots (4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm) matched to bore diameter, providing positive shaft locking without set-screw slippage.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🪜\u003c\/div\u003e\n      \u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e\n      \u003cp\u003eThe integrated step on the hub allows the gear to register against motor flanges or bearing faces, simplifying axial positioning during assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n      \u003cstrong\u003eWide Tooth Count Range (15T – 32T)\u003c\/strong\u003e\n      \u003cp\u003eTen tooth-count options from 15 to 32 teeth let you dial in the gear ratio you need for stepper motor drives, servo systems, or custom reduction stages.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🛠️\u003c\/div\u003e\n      \u003cstrong\u003eProcess Hole Option for Custom Boring\u003c\/strong\u003e\n      \u003cp\u003e\"Process Hole\" variants ship with a pilot bore ready for finish machining, giving machinists full control over final bore diameter and fit class.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 2.5 Mod Spur Pinion Gear\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModulus\u003c\/th\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e15T, 16T, 18T, 20T, 22T, 24T, 25T, 28T, 30T, 32T\u003c\/td\u003e\n\u003c\/tr\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped Hub\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003eProcess Hole; 12, 14, 15, 16, 18, 20, 22, 24, 25, 28, 30, 32, 35, 40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width Options\u003c\/th\u003e\n\u003ctd\u003e4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm (matched to bore)\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Gear Type\u003c\/th\u003e\n\u003ctd\u003e2.5 Modulus Spur Gear\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 application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the tooth count based on your desired gear ratio. Divide the driven gear's tooth count by the pinion's tooth count to get the ratio. For example, pairing a 15T pinion with a 30T gear gives a 2:1 reduction. Lower tooth counts produce higher reduction ratios; higher tooth counts reduce the ratio and increase output speed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does \"Process Hole\" mean, and can I use it as-is?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\"Process Hole\" means the gear ships with a rough pilot bore that is not finished to a specific diameter. It is intended for machinists who want to bore the hole to a precise fit class on a lathe. It cannot be used as-is on a standard motor shaft — finish boring is required before installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is 45# carbon steel for gear applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel (equivalent to AISI 1045) has a tensile strength of approximately 600–700 MPa in the normalized condition. It is suitable for moderate-load spur gear applications such as CNC drives, stepper motor stages, and light conveyor systems. For very high-torque or shock-load environments, consider heat-treated or alloy steel gears.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear rust or corrode over time?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For indoor, dry environments this is generally not a concern with normal maintenance. If your application involves moisture, coolant, or outdoor exposure, apply a light machine oil coating or consider a gear with a protective surface treatment. Contact us to confirm available finish options.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I confirm the keyway size matches my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCheck your motor shaft's keyway specification in the motor datasheet — it will list the key width and depth. Match the bore diameter to your shaft diameter and select the keyway width that corresponds to the standard key for that shaft size. For example, a 20 mm shaft typically uses a 6 mm key per DIN 6885 standards.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this pinion gear with a rack for linear motion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the rack is also 2.5 modulus and uses a matching 20° pressure angle. This is a common configuration for CNC router axes and linear actuators. Ensure the rack tooth profile is compatible before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between this gear and a standard spur gear without a step?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe stepped hub provides a shoulder that registers against a motor face or bearing, making axial positioning easier and more repeatable during assembly. A standard spur gear without a step requires additional spacers or careful measurement to achieve the same axial alignment.\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 Teeth count and Bore \u0026amp; Amount 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 application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the tooth count based on your desired gear ratio. Divide the driven gear's tooth count by the pinion's tooth count to get the ratio. For example, pairing a 15T pinion with a 30T gear gives a 2:1 reduction. Lower tooth counts produce higher reduction ratios; higher tooth counts reduce the ratio and increase output speed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 'Process Hole' mean, and can I use it as-is?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"'Process Hole' means the gear ships with a rough pilot bore that is not finished to a specific diameter. It is intended for machinists who want to bore the hole to a precise fit class on a lathe. It cannot be used as-is on a standard motor shaft — finish boring is required before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# carbon steel for gear applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel (equivalent to AISI 1045) has a tensile strength of approximately 600–700 MPa in the normalized condition. It is suitable for moderate-load spur gear applications such as CNC drives, stepper motor stages, and light conveyor systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear rust or corrode over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. For indoor, dry environments this is generally not a concern with normal maintenance. If your application involves moisture, coolant, or outdoor exposure, apply a light machine oil coating or consider a gear with a protective surface treatment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the keyway size matches my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Check your motor shaft's keyway specification in the motor datasheet — it will list the key width and depth. Match the bore diameter to your shaft diameter and select the keyway width that corresponds to the standard key for that shaft size. For example, a 20 mm shaft typically uses a 6 mm key per DIN 6885 standards.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this pinion gear with a rack for linear motion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the rack is also 2.5 modulus and uses a matching 20° pressure angle. This is a common configuration for CNC router axes and linear actuators. Ensure the rack tooth profile is compatible before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between this gear and a standard spur gear without a step?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stepped hub provides a shoulder that registers against a motor face or bearing, making axial positioning easier and more repeatable during assembly. A standard spur gear without a step requires additional spacers or careful measurement to achieve the same axial alignment.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2.5 Modulus \/ 15 Teeth \/ Process Hole \u0026 1 PCS","offer_id":52442549813522,"sku":"GYJLTJGJXCD4424x1","price":15.57,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus \/ 15 Teeth \/ 12mm + Keyway 4mm \u0026 1 PCS","offer_id":52442549846290,"sku":"GYJLTJGJXCD4425x1","price":16.58,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus \/ 15 Teeth \/ 14mm + Keyway 5mm \u0026 1 PCS","offer_id":52442549879058,"sku":"GYJLTJGJXCD4426x1","price":16.28,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus \/ 15 Teeth \/ 15mm + Keyway 5mm \u0026 1 PCS","offer_id":52442549911826,"sku":"GYJLTJGJXCD4427x1","price":16.12,"currency_code":"USD","in_stock":true},{"title":"2.5 Modulus \/ 15 Teeth \/ 16mm + Keyway 5mm \u0026 1 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