{"product_id":"module-2-3-precision-spur-gear-12-30-tooth-pinion-with-step-keyway-bore-nylon","title":"Module 2 3 Precision Spur Gear 12 - 30 Tooth Pinion with Step Keyway Bore Nylon","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eModule 2 \u0026amp; 3 Nylon Spur Gear with Step Keyway Bore — Lightweight Precision Pinion for Low-Noise Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eMetal gears rattle, corrode, and add unnecessary mass to builds where weight and noise matter. Robotics developers, 3D printer builders, and CNC hobbyists who need a quiet, corrosion-resistant module 2 \u0026amp; 3 nylon spur gear with step keyway bore can stop compromising between durability and acoustic performance. This precision nylon pinion delivers consistent tooth engagement without the clatter of steel-on-steel contact.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from engineering-grade nylon (PA), offering inherent lubrication, chemical resistance, and low friction. Two module standards are covered — Module 2 (2 mm per tooth) and Module 3 (3 mm per tooth) — with tooth counts spanning 12 T to 30 T. Outer diameters range from approximately 28 mm to 64 mm (1.10 in to 2.52 in) for Mod 2, and 42 mm to 66 mm (1.65 in to 2.60 in) for Mod 3. The stepped keyway bore accepts shaft diameters from 12 mm to 30 mm (0.47 in to 1.18 in) with matching wide keyway slots for positive torque transfer.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include low-noise motor pinion drives in desktop 3D printer extruder and axis gearboxes, lightweight robotic arm joint reducers where inertia reduction is critical, and small CNC router axis drives where a module 2 nylon spur gear with wide keyway bore eliminates the need for periodic lubrication.\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 standard Module 2 or Module 3 spur gear of matching module and 20° pressure angle. Verify center distance = (T₁ + T₂) × (Module ÷ 2) mm before assembly. Do not mix Module 2 and Module 3 gears in the same mesh.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Module 2 \u0026amp; 3 Nylon Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔇 \u003cstrong\u003eLow-Noise Nylon Construction\u003c\/strong\u003e\u003cbr\u003eEngineering-grade nylon (PA) dampens vibration and eliminates the metallic rattle of steel gear pairs, making these pinions ideal for desktop robotics and 3D printer drive trains.\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🛡️ \u003cstrong\u003eCorrosion-Resistant \u0026amp; Self-Lubricating\u003c\/strong\u003e\u003cbr\u003eNylon resists moisture, mild chemicals, and oxidation without surface treatment. The material's inherent lubricity reduces friction at the tooth face, extending service intervals.\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e⚖️ \u003cstrong\u003eLightweight for Inertia-Sensitive Drives\u003c\/strong\u003e\u003cbr\u003eNylon's low density significantly reduces rotating mass compared to steel equivalents, improving acceleration response in stepper-driven CNC axes and robotic joints.\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🎯 \u003cstrong\u003eStep Keyway Bore for Positive Shaft Lock\u003c\/strong\u003e\u003cbr\u003eThe stepped wide keyway bore (12–30 mm + matching keyway) provides a secure, slip-free shaft connection under reversing loads without requiring adhesive or set-screw backup.\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📐 \u003cstrong\u003eDual Module Coverage (Mod 2 \u0026amp; Mod 3)\u003c\/strong\u003e\u003cbr\u003eA single listing covers both Module 2 (17–30 T) and Module 3 (12–20 T) standards, letting you source pinions for multiple drive stages from one supplier.\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📏 \u003cstrong\u003eWide Tooth Count Range (12–30 T)\u003c\/strong\u003e\u003cbr\u003eSeventeen tooth-count options across both modules allow precise gear ratio selection for speed reduction or torque multiplication without custom machining.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Module 2 \u0026amp; 3 Nylon Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule Options\u003c\/th\u003e\n\u003ctd\u003eModule 2 \/ Module 3 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003eMod 2: 17–30 T; Mod 3: 12–20 T\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eEngineering-grade nylon (PA)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eStep keyway bore\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e12 mm – 30 mm (0.47 in – 1.18 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003e4 mm – 9 mm (matched to bore; see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e(Tooth Count + 2) × Module mm\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eIntegral hub with step bore\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural nylon (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc (multi-pack options available)\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 between Module 2 and Module 3 for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule 3 gears have larger, stronger teeth and are suited for higher torque at lower speeds. Module 2 gears are smaller and lighter, better for compact, higher-speed drives. Match the module to your mating gear — you cannot mesh a Mod 2 gear with a Mod 3 gear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\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\u003eSelect the bore diameter that matches your shaft. For example, if your shaft is 16 mm, choose the \"16mm + 5mm Wide Keyway\" option. The step keyway design means the bore and keyway are machined together — no additional machining is needed for standard shaft sizes listed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre nylon gears strong enough for continuous motor drive use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEngineering-grade nylon is well-suited for light-to-medium continuous loads at moderate speeds, such as those found in 3D printer drives, desktop robotics, and small CNC axes. For heavy shock loads or high-torque industrial drives, a steel gear is more appropriate. Check your application's tangential load against the gear's tooth strength before use.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Module 2 or Module 3 metal gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — module and pressure angle (20°) determine mesh compatibility, not material. A nylon Mod 2 gear will mesh correctly with a steel Mod 2 gear of any tooth count, provided the center distance is set to (T₁ + T₂) × 1 mm. The same applies to Mod 3 pairs using (T₁ + T₂) × 1.5 mm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo nylon gears require lubrication?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNylon is self-lubricating under most operating conditions, so grease or oil is not required for standard use. In high-speed or elevated-temperature environments, a light dry lubricant (such as PTFE spray) can extend tooth life, but it is not mandatory for typical robotics or 3D printer applications.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the \"step keyway bore\" and how does it differ from a standard keyway?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA step keyway bore features a wider-than-standard keyway slot machined into the bore, providing a larger contact area between the key and the gear hub. This distributes torque over a greater surface, reducing stress concentration and improving resistance to keyway wallowing under reversing or shock loads compared to a narrow standard keyway.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears outdoors or in humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNylon has good moisture resistance and will not rust or corrode. However, prolonged water immersion can cause nylon to absorb moisture and swell slightly, which may affect dimensional tolerances. For outdoor or wet environments, periodic inspection of bore fit and tooth clearance is recommended.\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 module, tooth count, and bore size 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 between Module 2 and Module 3 for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module 3 gears have larger, stronger teeth and are suited for higher torque at lower speeds. Module 2 gears are smaller and lighter, better for compact, higher-speed drives. Match the module to your mating gear — you cannot mesh a Mod 2 gear with a Mod 3 gear.\"\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\": \"Select the bore diameter that matches your shaft. The step keyway design means the bore and keyway are machined together — no additional machining is needed for standard shaft sizes listed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are nylon gears strong enough for continuous motor drive use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Engineering-grade nylon is well-suited for light-to-medium continuous loads at moderate speeds, such as those found in 3D printer drives, desktop robotics, and small CNC axes. For heavy shock loads or high-torque industrial drives, a steel gear is more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Module 2 or Module 3 metal gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — module and pressure angle (20 degrees) determine mesh compatibility, not material. A nylon Mod 2 gear will mesh correctly with a steel Mod 2 gear of any tooth count, provided the center distance is set correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do nylon gears require lubrication?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon is self-lubricating under most operating conditions, so grease or oil is not required for standard use. In high-speed or elevated-temperature environments, a light dry lubricant can extend tooth life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the step keyway bore and how does it differ from a standard keyway?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A step keyway bore features a wider-than-standard keyway slot machined into the bore, providing a larger contact area between the key and the gear hub. This distributes torque over a greater surface, reducing stress concentration under reversing or shock loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears outdoors or in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Nylon has good moisture resistance and will not rust or corrode. However, prolonged water immersion can cause nylon to absorb moisture and swell slightly, which may affect dimensional tolerances.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Mod 2 【17 Tooth】 \/ 12mm + 4mm Wide Keyway \/ 1 pcs","offer_id":52442962460946,"sku":"PENGJGJXCD2445x1","price":12.58,"currency_code":"USD","in_stock":true},{"title":"Mod 2 【17 Tooth】 \/ 14mm + 5mm Wide Keyway \/ 1 pcs","offer_id":52442962493714,"sku":"PENGJGJXCD2446x1","price":12.5,"currency_code":"USD","in_stock":true},{"title":"Mod 2 【17 Tooth】 \/ 15mm + 5mm Wide Keyway \/ 1 pcs","offer_id":52442962526482,"sku":"PENGJGJXCD2447x1","price":12.44,"currency_code":"USD","in_stock":true},{"title":"Mod 2 【18 Tooth】 \/ 12mm + 4mm Wide Keyway \/ 1 pcs","offer_id":52442962559250,"sku":"PENGJGJXCD2450x1","price":12.77,"currency_code":"USD","in_stock":true},{"title":"Mod 2 【18 Tooth】 \/ 14mm + 5mm Wide Keyway \/ 1 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