{"product_id":"1-mod-15-teeth-spur-gear-bore-4mm-8mm-pitch-3-14mm","title":"1 Modulus 15 Teeth Spur Gears Transmission Motor Gear Bore 4mm-8mm Pitch 3.14mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1 Mod 15 Teeth Spur Gears — Reliable Transmission for DIY Motors \u0026amp; Automation Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen your motor shaft slips, your gear ratio drifts, or your existing plastic gears strip under load, you need a drop-in replacement that holds its geometry under real working conditions. Makers, robotics builders, CNC hobbyists, and small-machine engineers rely on these 1 Modulus 15 Teeth Spur Gears to deliver consistent torque transfer across a wide range of bore sizes and material grades.\u003c\/p\u003e\n    \u003cp\u003eEach spur gear is machined to a 1 Mod (Module 1) standard with 15 teeth and a pitch of 3.14mm (≈ 0.124 in). Bore options span 4mm through 8mm (plus keyed variants up to 8×7.5mm), covering the most common motor shaft diameters used in DIY automation. Available in three materials — engineering-grade Nylon, 304 Stainless Steel, and medium-carbon 45# Steel — so you can match the gear to your load, environment, and budget.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include small DC and stepper motor drives in 3D printer extruder assemblies, tabletop CNC router axis drives, robotic arm joint mechanisms, conveyor prototype builds, and educational mechatronics kits where a 1 mod 15 tooth spur gear with a 4mm–8mm bore is the standard interchange component.\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 1 (Mod 1) spur or helical gear. Verify your mating gear's module before ordering. Bore must match your motor shaft diameter — see variant options for available sizes.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1 Mod 15 Teeth Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 1 Standard, 15 Teeth\u003c\/strong\u003e — 3.14mm pitch circle pitch ensures direct mesh compatibility with the entire Module 1 gear family used across DIY robotics and automation platforms.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eThree Material Grades\u003c\/strong\u003e — Nylon for lightweight, low-noise, self-lubricating applications; 304 Stainless Steel for corrosion-resistant environments; 45# Steel for higher-torque mechanical drives requiring solid metal construction.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Bore Range\u003c\/strong\u003e — Round bores from 4mm to 8mm plus D-bore \/ keyed variants (5×4.5mm, 6×5mm, 6×5.5mm, 8×7mm, 8×7.5mm) accommodate the most common motor shaft profiles without custom machining.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eConsistent Tooth Geometry\u003c\/strong\u003e — Machined tooth profile maintains accurate involute form for smooth, low-vibration power transmission even at higher RPM ranges typical of small DC motors.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect Drop-In Replacement\u003c\/strong\u003e — Standard Mod 1 dimensions mean these gears interchange with OEM and aftermarket components in 3D printers, CNC machines, and robotic kits without modification.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eMaterial-Matched Durability\u003c\/strong\u003e — Stainless Steel variants resist moisture and mild chemicals; 45# Steel variants handle sustained mechanical load; Nylon variants reduce system noise and eliminate the need for external lubrication in light-duty cycles.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 1 Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch (Circular Pitch)\u003c\/th\u003e\n\u003ctd\u003e3.14mm (≈ 0.124 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard involute)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e15mm (≈ 0.591 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOutside Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e17mm (≈ 0.669 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Options\u003c\/th\u003e\n\u003ctd\u003e4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm (round); 5×4.5mm, 6×5mm, 6×5.5mm, 8×7mm, 8×7.5mm (keyed\/D-bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eNylon \/ 304 Stainless Steel \/ 45# Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Width (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural (Nylon) \/ Polished (Stainless Steel) \/ Black oxide or natural (45# Steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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 know which bore size to choose?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. Round bores (4mm–8mm) suit standard round shafts. If your shaft has a flat (D-shaft) or keyway, select the matching keyed bore variant such as 6×5mm or 8×7mm — the first number is the bore diameter and the second is the flat-to-bore dimension.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Module 1 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any two Module 1 external spur gears with a 20° pressure angle will mesh correctly regardless of tooth count. Confirm your mating gear is marked \"M1\" or \"Mod 1\" before ordering. Gears of different modules (e.g., Mod 0.8 or Mod 1.5) are not interchangeable.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich material should I choose for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eChoose \u003cstrong\u003eNylon\u003c\/strong\u003e for lightweight, quiet, low-torque applications (e.g., small robots, educational kits) where self-lubrication is an advantage. Choose \u003cstrong\u003eStainless Steel\u003c\/strong\u003e when the gear will be exposed to moisture, humidity, or mild chemicals. Choose \u003cstrong\u003e45# Steel\u003c\/strong\u003e for higher-torque mechanical drives where metal-to-metal strength is required and the environment is dry.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under continuous load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on material and operating speed. 45# Steel offers the highest tensile strength for sustained mechanical loads. Stainless Steel provides good strength with corrosion resistance. Nylon is suited for light-duty, intermittent-load applications. For precise torque ratings, refer to your system's gear stress calculations using the gear's pitch circle diameter and face width.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 304 Stainless Steel variants offer solid corrosion resistance suitable for humid environments, light washdown, and outdoor enclosures. Nylon is inherently non-corrosive. The 45# Steel variants are not corrosion-resistant and should be used in dry, protected environments or treated with a suitable coating if moisture exposure is expected.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a 3D printer or CNC machine?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Module 1, 15-tooth spur gears are a common interchange component in many open-source 3D printer extruder drives and small CNC axis assemblies. Verify the bore matches your motor shaft and that the gear's outside diameter clears your housing before installing.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many gears are included per order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach order includes 1 piece. If you need multiple gears for a gear train or redundancy stock, simply increase the quantity at checkout.\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 Model, Bore, and Material 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 know which bore size to choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper. Round bores (4mm–8mm) suit standard round shafts. If your shaft has a flat (D-shaft) or keyway, select the matching keyed bore variant such as 6x5mm or 8x7mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 1 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two Module 1 external spur gears with a 20° pressure angle will mesh correctly regardless of tooth count. Confirm your mating gear is marked M1 or Mod 1 before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which material should I choose for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose Nylon for lightweight, quiet, low-torque applications. Choose Stainless Steel when the gear will be exposed to moisture or mild chemicals. Choose 45# Steel for higher-torque mechanical drives in dry environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under continuous load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# Steel offers the highest tensile strength for sustained mechanical loads. Stainless Steel provides good strength with corrosion resistance. Nylon is suited for light-duty, intermittent-load applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 Stainless Steel variants offer solid corrosion resistance for humid environments. Nylon is inherently non-corrosive. 45# Steel variants should be used in dry, protected environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Module 1, 15-tooth spur gears are a common interchange component in many 3D printer extruder drives and small CNC axis assemblies. Verify the bore matches your motor shaft before installing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many gears are included per order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order includes 1 piece. Increase the quantity at checkout if you need multiple gears.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod 15 Teeth \/ 4mm \/ Nylon","offer_id":52443255570706,"sku":"LXDGLCDPJ00446x1","price":13.23,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 5mm \/ Nylon","offer_id":52443255603474,"sku":"LXDGLCDPJ00447x1","price":13.23,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 5mm \/ Stainless Steel","offer_id":52443255636242,"sku":"LXDGLCDPJ00448x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6mm \/ Stainless Steel","offer_id":52443255669010,"sku":"LXDGLCDPJ00449x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6.35mm \/ Stainless Steel","offer_id":52443255701778,"sku":"LXDGLCDPJ00450x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 7mm \/ Stainless Steel","offer_id":52443255734546,"sku":"LXDGLCDPJ00451x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 8mm \/ Stainless Steel","offer_id":52443255767314,"sku":"LXDGLCDPJ00452x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 4mm \/ 45# Steel","offer_id":52443255800082,"sku":"LXDGLBZSJ057386x1","price":8.47,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 5mm \/ 45# Steel","offer_id":52443255832850,"sku":"LXDGLBZSJ057387x1","price":8.47,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6mm \/ 45# Steel","offer_id":52443255865618,"sku":"LXDGLBZSJ057388x1","price":8.47,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6.35mm \/ 45# Steel","offer_id":52443255898386,"sku":"LXDGLBZSJ057389x1","price":8.68,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 7mm \/ 45# Steel","offer_id":52443255931154,"sku":"LXDGLBZSJ057390x1","price":8.47,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 8mm \/ 45# Steel","offer_id":52443255963922,"sku":"LXDGLBZSJ057391x1","price":9.49,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 5x4.5mm \/ 45# Steel","offer_id":52443255996690,"sku":"LXDGLBZSJ057392x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6x5mm \/ 45# Steel","offer_id":52443256029458,"sku":"LXDGLBZSJ057393x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 6x5.5mm \/ 45# Steel","offer_id":52443256062226,"sku":"LXDGLBZSJ057394x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 8x7mm \/ 45# Steel","offer_id":52443256094994,"sku":"LXDGLBZSJ057395x1","price":12.42,"currency_code":"USD","in_stock":true},{"title":"1 Mod 15 Teeth \/ 8x7.5mm \/ 45# Steel","offer_id":52443256127762,"sku":"LXDGLBZSJ057396x1","price":12.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-04_1_4f777423-7a7c-49d8-8c8e-cc4bd23edc15.jpg?v=1784042250","url":"https:\/\/homediyer.com\/products\/1-mod-15-teeth-spur-gear-bore-4mm-8mm-pitch-3-14mm","provider":"HomeDIYer","version":"1.0","type":"link"}