{"product_id":"3-mod-blue-nylon-spur-gear-with-step-12-20-teeth-14-30mm-bore-pinion-motor-gear","title":"3 Mod Blue Nylon Spur Gear with Step 12-20 Teeth 14-30mm Bore Pinion Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3 Mod Blue Nylon Spur Gear — Lightweight, Low-Noise Pinion for CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen metal-on-metal noise, weight, or corrosion is a concern in your drive system, engineers and makers working on CNC machines, robotics, 3D printers, and light automation rigs need a reliable alternative. This 3 Mod blue nylon spur gear with step keyway bore delivers quiet, smooth meshing with reduced vibration — making it a practical choice for applications where noise reduction and weight savings matter.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from engineering-grade nylon (PA66), colored blue for easy identification in multi-gear assemblies. The stepped hub design accommodates keyway bores ranging from 14 mm to 30 mm (approximately 0.55 in to 1.18 in), with tooth counts from 12 to 20 teeth and a module of 3. Pitch diameter ranges from approximately 36 mm (1.42 in) for 12T up to 60 mm (2.36 in) for 20T.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include low-to-medium load conveyor drives where noise reduction is critical, stepper motor pinion stages in desktop CNC routers and laser cutters, and lightweight gear trains in educational robotics platforms and prototype automation rigs.\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 Module 3 (Mod 3) gear systems. Meshes with any standard Mod 3 spur or rack gear. Verify bore size and keyway dimensions match your shaft before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3 Mod Blue Nylon Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\u003cstrong\u003eEngineering-Grade Nylon (PA66) Construction\u003c\/strong\u003e — Lightweight and self-lubricating material reduces friction and wear without added grease in many low-load applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\u003cstrong\u003eLow-Noise, Vibration-Damping Meshing\u003c\/strong\u003e — Nylon tooth profile absorbs impact and reduces gear noise compared to steel equivalents, ideal for noise-sensitive environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 3 Standard Tooth Profile\u003c\/strong\u003e — Fully compatible with all standard Mod 3 mating gears, racks, and pinions for straightforward system integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eStepped Hub with Keyway Bore\u003c\/strong\u003e — Step design provides axial positioning reference; keyway bore (5 mm, 6 mm, or 8 mm keyway depending on bore size) ensures positive torque transmission without slipping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eWide Bore Range: 14–30 mm\u003c\/strong\u003e — Covers common motor and shaft diameters from 14 mm (0.55 in) to 30 mm (1.18 in), reducing the need for custom adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Material\u003c\/strong\u003e — Nylon is inherently resistant to moisture, mild chemicals, and oxidation, making it suitable for lightly humid or outdoor-adjacent environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3 Mod Nylon Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e12 \/ 13 \/ 14 \/ 15 \/ 16 \/ 18 \/ 20 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e14 \/ 15 \/ 16 \/ 18 \/ 20 \/ 22 \/ 24 \/ 25 \/ 28 \/ 30 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e5 mm (bore 14–16 mm) \/ 6 mm (bore 18–22 mm) \/ 8 mm (bore 24–30 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e36 mm (12T) – 60 mm (20T) \/ approx. 1.42–2.36 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub with keyway\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade nylon (PA66)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlue\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard involute spur\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\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\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 tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 12T pinion with a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed reduction and more torque output, or a larger count for closer to 1:1 ratios.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter precisely with calipers. Select the bore size that matches your shaft diameter exactly — the keyway bore is machined to standard tolerances for a snug fit with a matching key. Available bores range from 14 mm to 30 mm. If your shaft is metric, match it directly; if imperial, convert and select the nearest available size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this nylon gear handle the same loads as a steel spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNylon gears are well-suited for low-to-medium torque applications but are not a direct replacement for steel in high-load or high-temperature environments. PA66 nylon has good tensile strength for light automation, CNC routing, and robotics, but if your application involves sustained heavy loads, shock loading, or temperatures above approximately 100°C (212°F), a metal gear would be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion-resistant? Can I use it in damp conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Nylon (PA66) is inherently resistant to moisture, mild oils, and many common chemicals. It will not rust or oxidize. It is suitable for lightly humid environments, indoor washdown-adjacent areas, or applications where occasional moisture exposure is expected. Avoid prolonged submersion or exposure to strong acids and solvents.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh correctly with my existing Mod 3 metal gears or rack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This gear follows the standard Module 3 involute tooth profile with a 20° pressure angle, which is fully compatible with any standard Mod 3 spur gear, pinion, or rack regardless of material (steel, aluminum, or nylon). Ensure the mating gear also has Module 3 — gears of different modules will not mesh correctly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the stepped hub design affect how I install the gear on the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe stepped hub provides a shoulder that acts as an axial stop, making it easier to position the gear consistently on the shaft without additional spacers in many setups. Slide the gear onto the shaft until the step seats against your reference surface, insert the key into the keyway, and secure with a set screw or retaining ring as appropriate for your assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to lubricate this nylon gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNylon is self-lubricating in many light-duty applications and can run dry at low speeds and loads. For higher speeds or moderate loads, a light application of white lithium grease or PTFE-based lubricant can extend service life. Avoid petroleum-based oils that may degrade nylon over time.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\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 tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 12T pinion with a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed reduction and more torque output, or a larger count for closer to 1:1 ratios.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I select for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter precisely with calipers. Select the bore size that matches your shaft diameter exactly. Available bores range from 14 mm to 30 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this nylon gear handle the same loads as a steel spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon gears are well-suited for low-to-medium torque applications but are not a direct replacement for steel in high-load or high-temperature environments. PA66 nylon is suitable for light automation, CNC routing, and robotics.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant? Can I use it in damp conditions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Nylon (PA66) is inherently resistant to moisture, mild oils, and many common chemicals. It will not rust or oxidize and is suitable for lightly humid environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh correctly with my existing Mod 3 metal gears or rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This gear follows the standard Module 3 involute tooth profile with a 20° pressure angle, fully compatible with any standard Mod 3 spur gear, pinion, or rack.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the stepped hub design affect how I install the gear on the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stepped hub provides a shoulder that acts as an axial stop, making it easier to position the gear consistently on the shaft without additional spacers in many setups.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate this nylon gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon is self-lubricating in many light-duty applications and can run dry at low speeds and loads. For higher speeds or moderate loads, a light application of white lithium grease or PTFE-based lubricant can extend service life.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3 Mod \/ 12 Teeth \/ Hole 14 + keyway 5mm \u0026 1 Pcs","offer_id":52442649559314,"sku":"GLFBQLWJGJXCD2513x1","price":16.66,"currency_code":"USD","in_stock":true},{"title":"3 Mod \/ 12 Teeth \/ Hole 15 + keyway 5mm \u0026 1 Pcs","offer_id":52442649592082,"sku":"GLFBQLWJGJXCD2514x1","price":16.58,"currency_code":"USD","in_stock":true},{"title":"3 Mod \/ 12 Teeth \/ Hole 16 + keyway 5mm \u0026 1 Pcs","offer_id":52442649624850,"sku":"GLFBQLWJGJXCD2515x1","price":16.52,"currency_code":"USD","in_stock":true},{"title":"3 Mod \/ 13 Teeth \/ Hole 14 + keyway 5mm \u0026 1 Pcs","offer_id":52442649657618,"sku":"GLFBQLWJGJXCD2516x1","price":17.2,"currency_code":"USD","in_stock":true},{"title":"3 Mod \/ 13 Teeth \/ Hole 15 + keyway 5mm \u0026 1 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