{"product_id":"1-module-stainless-steel-spur-gears-20-50-teeth-pinion-motor-gear-keyway-hole","title":"1 Module Stainless Steel Spur Gears 20-50 Teeth Pinion Motor Gear Keyway Hole","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Module Stainless Steel Spur Gears — Precision Pinion Gears for Motor \u0026amp; Drive Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped or undersized gear brings your build to a halt, the fix demands a part you can trust. These 1 module stainless steel spur gears are engineered for hobbyists, makers, and small-scale machine builders who need reliable, dimensionally consistent pinion gears without sourcing from industrial distributors.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from stainless steel and offered across a tooth range of 20 to 50 teeth (1 Mod), with bore diameters spanning 8 mm to 20 mm (approx. 0.31\"–0.79\") and keyway slots sized 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm depending on bore. Outside diameters scale with tooth count, ranging from approximately 22 mm (0.87\") for 20T up to approximately 52 mm (2.05\") for 50T.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor pinion replacement in robotics and automation rigs, gear-train assembly in CNC router Z-axis drives, and custom reduction stages in 3D printer extruder or conveyor systems where a 1 mod stainless steel spur gear with keyway bore is required for positive shaft engagement.\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 1 (Mod 1) spur or helical gear of matching pressure angle (typically 20°). Verify bore diameter and keyway dimensions against your shaft spec before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1 Module Stainless Steel Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e — Resists oxidation and surface corrosion in humid or lightly wet environments, extending service life compared to carbon steel alternatives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 1 Standard\u003c\/strong\u003e — Conforms to the international Mod 1 gear standard, ensuring direct mesh compatibility with any Module 1 counterpart gear or rack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth Range: 20–50 Teeth\u003c\/strong\u003e — Covers common reduction ratios from 1:1 to roughly 1:2.5 within a single product family, reducing the need for multiple sourcing events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cstrong\u003eKeyway Bore for Positive Drive\u003c\/strong\u003e — Keyway slots (3×1.4 mm up to 6×2.8 mm) prevent shaft slippage under load, critical for motor pinion and drive gear applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes: 8–20 mm\u003c\/strong\u003e — Bore options from 8 mm to 20 mm accommodate a broad range of motor and shaft diameters without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Ready\u003c\/strong\u003e — Standardized Mod 1 geometry means these gears slot directly into existing gear trains in robotics, CNC, and automation builds with no modification.\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 Stainless Steel Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (Mod 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e20 – 50 Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm \/ 17 mm \/ 18 mm \/ 19 mm \/ 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Dimensions\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm (varies by bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (scales with tooth count: approx. 22–52 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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (uncoated)\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 choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect tooth count based on your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 20-tooth pinion with a 40-tooth gear gives a 2:1 reduction. Also confirm that the resulting outside diameter fits within your housing clearance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I order 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 option that matches — for example, an 8 mm shaft requires the 8 mm bore variant. The keyway dimensions are listed per bore size in the specifications table above; confirm your shaft has a matching keyway cut.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for continuous-duty motor drives?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers good tensile strength suitable for light-to-medium duty motor pinion applications such as robotics, small CNC axes, and conveyor drives. For heavy industrial loads or high-RPM continuous duty, verify the gear's rated torque against your application's peak load. Contact us to confirm suitability for demanding cycles.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears corrode if used outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel provides significantly better corrosion resistance than standard carbon steel gears. These gears are suitable for humid indoor environments and light outdoor exposure. For immersion or salt-spray environments, additional sealing or a higher-grade stainless alloy may be advisable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with Module 1 plastic or aluminum gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any Module 1 gear — regardless of material — will mesh correctly with these stainless steel Mod 1 spur gears, provided the pressure angle matches (20° standard). Mixed-material pairings are common in robotics where a harder steel pinion drives a softer plastic or aluminum gear to reduce wear on the replaceable component.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these without a keyway if my shaft is smooth?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe bore includes a keyway slot, but you can still mount the gear on a smooth shaft using a set screw or retaining compound if your application allows it. However, for torque-transmitting motor drives, a matching keyed shaft is strongly recommended to prevent rotational slippage under load.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the bore options listed (e.g., 8\/3×1.4mm vs 10\/3×1.4mm)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe format is \u003cem\u003eBore diameter \/ Keyway width × Keyway depth\u003c\/em\u003e. So \"8\/3×1.4mm\" means an 8 mm bore with a 3 mm wide × 1.4 mm deep keyway slot, while \"10\/4×1.8mm\" means a 10 mm bore with a 4 mm wide × 1.8 mm deep keyway. Match both the bore diameter and keyway dimensions to your shaft and key stock.\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 Modulus \u0026amp; Teeth 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 the right tooth count for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select tooth count based on your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 20-tooth pinion with a 40-tooth gear gives a 2:1 reduction. Also confirm that the resulting outside diameter fits within your housing clearance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I order for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter precisely with calipers. Select the bore option that matches. The keyway dimensions are listed per bore size in the specifications table; confirm your shaft has a matching keyway cut.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for continuous-duty motor drives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel offers good tensile strength suitable for light-to-medium duty motor pinion applications such as robotics, small CNC axes, and conveyor drives. Verify the gear's rated torque against your application's peak load for demanding cycles.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears corrode if used outdoors or in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel provides significantly better corrosion resistance than standard carbon steel gears. These gears are suitable for humid indoor environments and light outdoor exposure.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with Module 1 plastic or aluminum gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any Module 1 gear will mesh correctly with these stainless steel Mod 1 spur gears, provided the pressure angle matches (20° standard).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these without a keyway if my shaft is smooth?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The bore includes a keyway slot, but you can mount the gear on a smooth shaft using a set screw or retaining compound. For torque-transmitting motor drives, a matching keyed shaft is strongly recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the bore options listed (e.g., 8\/3×1.4mm vs 10\/3×1.4mm)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The format is Bore diameter \/ Keyway width × Keyway depth. So 8\/3×1.4mm means an 8 mm bore with a 3 mm wide × 1.4 mm deep keyway slot.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1Mod 20Teeth \/ 8\/3*1.4mm \/ 1 Pcs","offer_id":52442764706066,"sku":"GLFBQLWGLCDPJ00512x1","price":14.54,"currency_code":"USD","in_stock":true},{"title":"1Mod 22Teeth \/ 8\/3*1.4mm \/ 1 Pcs","offer_id":52442764738834,"sku":"GLFBQLWGLCDPJ00530x1","price":15.49,"currency_code":"USD","in_stock":true},{"title":"1Mod 24Teeth \/ 8\/3*1.4mm \/ 1 Pcs","offer_id":52442764771602,"sku":"GLFBQLWGLCDPJ00565x1","price":16.8,"currency_code":"USD","in_stock":true},{"title":"1Mod 24Teeth \/ 10\/3*1.4mm \/ 1 Pcs","offer_id":52442764804370,"sku":"GLFBQLWGLCDPJ00566x1","price":16.8,"currency_code":"USD","in_stock":true},{"title":"1Mod 24Teeth \/ 10\/4*1.8mm \/ 1 Pcs","offer_id":52442764837138,"sku":"GLFBQLWGLCDPJ00567x1","price":16.8,"currency_code":"USD","in_stock":true},{"title":"1Mod 25Teeth \/ 8\/3*1.4mm \/ 1 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