{"product_id":"mod-1-5-steel-spur-gear-24-tooth-bore-10mm-15mm-transmission-pinion-with-keyslot","title":"Mod 1.5 Steel Spur Gear 24 Tooth Bore 10mm-15mm Transmission Pinion with Keyslot","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 1.5 Steel Spur Gear 24T — Reliable Power Transmission for DIY and Mechanical Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen a slipping or mismatched gear brings your build to a halt, you need a replacement you can trust. Whether you're a robotics hobbyist, a CNC builder, or a mechanical engineer prototyping a drive system, finding a spur gear with the right bore and keyslot combination shouldn't be a compromise. This Mod 1.5 steel spur gear with 24 teeth is designed for builders who need precision, strength, and a secure shaft fit — right out of the box.\u003c\/p\u003e\n    \u003cp\u003eThis spur gear is machined from carbon steel, offering a solid balance of hardness and machinability. The gear follows the Mod 1.5 (Module 1.5) standard, with 24 teeth and an outer diameter of approximately 39 mm (≈1.54 in). Bore sizes range from 10 mm to 15 mm (0.39 in – 0.59 in), and keyslot options of 4×1.8 mm or 5×2.3 mm allow for a positive, non-slip shaft connection.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor output shafts in robotics and automation rigs, gearbox reduction stages in CNC router builds, and custom transmission assemblies in go-karts, electric bikes, or maker projects requiring a compact Mod 1.5 pinion gear with keyway.\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 any Mod 1.5 (M1.5) standard spur or helical gear. Verify bore diameter and keyslot dimensions match your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Mod 1.5 Steel Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eModule 1.5 Standard\u003c\/strong\u003e — Meshes precisely with any M1.5-compatible gear in your drivetrain, ensuring consistent tooth engagement and smooth power transfer.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\n        \u003cstrong\u003e24-Tooth Count\u003c\/strong\u003e — A 24T configuration delivers a practical gear ratio for moderate-speed, moderate-torque applications in robotics, automation, and DIY transmission builds.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore Sizes (10–15 mm)\u003c\/strong\u003e — Available in 10 mm, 12 mm, 12.7 mm, 14 mm, and 15 mm bore diameters to fit a wide range of motor and shaft sizes without custom machining.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🗝️\u003c\/span\u003e\n        \u003cstrong\u003eKeyslot for Positive Shaft Lock\u003c\/strong\u003e — Choose between a 4×1.8 mm or 5×2.3 mm keyslot to eliminate shaft slippage under load — critical for high-cycle or high-torque applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e — Machined from carbon steel for durability under mechanical stress, suitable for continuous-duty drive systems and repetitive load cycles.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eCompact Pinion Profile\u003c\/strong\u003e — With an OD of approximately 39 mm (≈1.54 in) and a face width suited to Mod 1.5 standards, this pinion fits into tight gearbox envelopes without sacrificing tooth strength.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 1.5 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 39 mm (≈1.54 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e10 mm \/ 12 mm \/ 12.7 mm \/ 14 mm \/ 15 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyslot Dimensions\u003c\/th\u003e\n\u003ctd\u003e4×1.8 mm or 5×2.3 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee 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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute\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      \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 bore size for my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. Select the bore size that matches exactly — available options are 10 mm, 12 mm, 12.7 mm (1\/2 in), 14 mm, and 15 mm. A bore that is too large will cause shaft slippage even with a keyslot; a bore that is too small cannot be fitted without machining.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich keyslot size should I choose — 4×1.8 mm or 5×2.3 mm?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe keyslot size must match the key and keyway already cut into your shaft. The 4×1.8 mm keyslot is typically paired with smaller bore shafts (10–12 mm), while the 5×2.3 mm keyslot suits larger bore shafts (12.7–15 mm). Check your shaft specification or motor datasheet to confirm the correct key size before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Mod 1.5 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear following the Module 1.5 (M1.5) standard with a matching pressure angle of 20° will mesh correctly with this spur gear. Confirm that your mating gear is also M1.5 and not a similar-looking but incompatible pitch (such as 16 DP or 18 DP imperial pitch gears).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is this gear under load? Is it suitable for high-torque applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear is machined from carbon steel, which provides good tensile strength and wear resistance for mechanical drive applications. It is suitable for moderate-to-high torque robotics, CNC, and automation builds. For extreme shock-load or very high-speed applications, consider whether a heat-treated or alloy steel variant better suits your requirements. Contact us to confirm if you have specific load data.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this gear corrosion-resistant? Can I use it in outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel has limited inherent corrosion resistance. For outdoor, humid, or wet environments, we recommend applying a light machine oil or grease coating during installation and periodically during service. If your application requires inherent corrosion resistance, consider a stainless steel or plastic gear alternative.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the outer diameter and face width of this gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a Mod 1.5 gear with 24 teeth, the theoretical outer diameter (tip diameter) is approximately 39 mm (≈1.54 in), calculated as (teeth + 2) × module = 26 × 1.5. Face width follows standard Mod 1.5 proportions; please contact us or refer to the product images for the exact face width of the specific variant you need.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear as a replacement pinion in a gearbox or reduction drive?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This 24-tooth Mod 1.5 spur gear is well-suited as a pinion (driving gear) in a reduction gearbox. Pair it with a larger Mod 1.5 spur gear to achieve your desired gear ratio. For example, pairing with a 48-tooth gear gives a 2:1 reduction. Ensure center distance between shafts is calculated correctly for the module and tooth counts used.\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 bore size and keyslot 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 bore size for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper. Select the bore size that matches exactly — available options are 10 mm, 12 mm, 12.7 mm (1\/2 in), 14 mm, and 15 mm. A bore that is too large will cause shaft slippage even with a keyslot; a bore that is too small cannot be fitted without machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which keyslot size should I choose — 4×1.8 mm or 5×2.3 mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The keyslot size must match the key and keyway already cut into your shaft. The 4×1.8 mm keyslot is typically paired with smaller bore shafts (10–12 mm), while the 5×2.3 mm keyslot suits larger bore shafts (12.7–15 mm). Check your shaft specification or motor datasheet to confirm the correct key size before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 1.5 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear following the Module 1.5 (M1.5) standard with a matching pressure angle of 20° will mesh correctly with this spur gear. Confirm that your mating gear is also M1.5 and not a similar-looking but incompatible pitch (such as 16 DP or 18 DP imperial pitch gears).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is this gear under load? Is it suitable for high-torque applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear is machined from carbon steel, which provides good tensile strength and wear resistance for mechanical drive applications. It is suitable for moderate-to-high torque robotics, CNC, and automation builds. For extreme shock-load or very high-speed applications, consider whether a heat-treated or alloy steel variant better suits your requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant? Can I use it in outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel has limited inherent corrosion resistance. For outdoor, humid, or wet environments, we recommend applying a light machine oil or grease coating during installation and periodically during service.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the outer diameter and face width of this gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a Mod 1.5 gear with 24 teeth, the theoretical outer diameter (tip diameter) is approximately 39 mm (≈1.54 in), calculated as (teeth + 2) × module = 26 × 1.5.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear as a replacement pinion in a gearbox or reduction drive?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This 24-tooth Mod 1.5 spur gear is well-suited as a pinion (driving gear) in a reduction gearbox. Pair it with a larger Mod 1.5 spur gear to achieve your desired gear ratio. For example, pairing with a 48-tooth gear gives a 2:1 reduction.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M-24T \/ 10mm \/ 4x1.8mm","offer_id":52442123043090,"sku":"GLFBCQFGLBZSJ057873x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"1.5M-24T \/ 12mm \/ 4x1.8mm","offer_id":52442123075858,"sku":"GLFBCQFGLBZSJ057874x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"1.5M-24T \/ 12mm \/ 5x2.3mm","offer_id":52442123108626,"sku":"GLFBCQFGLBZSJ057875x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"1.5M-24T \/ 12.7mm \/ 5x2.3mm","offer_id":52442123141394,"sku":"GLFBCQFGLBZSJ057876x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"1.5M-24T \/ 14mm \/ 5x2.3mm","offer_id":52442123174162,"sku":"GLFBCQFGLBZSJ057877x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"1.5M-24T \/ 15mm \/ 5x2.3mm","offer_id":52442123206930,"sku":"GLFBCQFGLBZSJ057878x1","price":22.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_ee6fed8a-edab-46ba-92a4-cb7cc28e88fb.jpg?v=1783408291","url":"https:\/\/homediyer.com\/products\/mod-1-5-steel-spur-gear-24-tooth-bore-10mm-15mm-transmission-pinion-with-keyslot","provider":"HomeDIYer","version":"1.0","type":"link"}