{"product_id":"mod-1-stainless-steel-spur-gears-pinion-gear-motor-gear-31-50-teeth-bore-8-20mm","title":"Mod 1 Stainless Steel Spur Gears Pinion Gear Motor Gear, 31-50 Teeth Bore 8-20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 1 Stainless Steel Spur Gears — Precise Power Transmission for DIY and Industrial Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your motor drive, robotic arm, or CNC axis demands consistent torque transfer without slop or premature wear, the wrong gear becomes the most expensive part in your build. These Mod 1 stainless steel spur gears are engineered for makers, engineers, and hobbyists who need reliable pinion gear performance across a wide range of shaft sizes and tooth counts — without sourcing from multiple suppliers.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from stainless steel, offering corrosion resistance and structural rigidity. The Mod 1 (1M) tooth profile ensures standard metric compatibility across the full range of 31 to 50 teeth. Bore options span 8 mm (0.31 in) to 20 mm (0.79 in), with plain round bores and keyway variants available — keyway slots range from 3×1.4 mm up to 6×2.8 mm depending on bore size, enabling positive shaft locking without set-screw slippage.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor pinion drives in robotics and automation rigs, lead-screw stage drives in DIY CNC routers and laser cutters, and gear-reduction assemblies in electric go-karts, conveyor systems, and custom actuators where a standard Mod 1 spur gear mesh is required.\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 Mod 1 (Module 1) spur or rack gear. Verify bore diameter and keyway dimensions against your shaft before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 1 Stainless Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦾 \u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\u003cbr\u003eAvailable from 31T to 50T (excluding 41T) in a single product listing — select the exact gear ratio you need without hunting across multiple SKUs.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩 \u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e\u003cbr\u003ePlain round bores from 8 mm to 20 mm, plus keyway variants (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) for positive shaft engagement and zero rotational slip.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️ \u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e\u003cbr\u003eCorrosion-resistant stainless steel body withstands humid, wet, and mildly corrosive environments — suitable for food-adjacent machinery, outdoor robotics, and marine-adjacent builds.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐 \u003cstrong\u003eStandard Mod 1 Tooth Profile\u003c\/strong\u003e\u003cbr\u003eFull metric Module 1 tooth geometry ensures drop-in mesh compatibility with any standard 1M rack, pinion, or mating spur gear in your drivetrain.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡ \u003cstrong\u003ePrecision Machined Bore\u003c\/strong\u003e\u003cbr\u003eBores are machined to close tolerances for minimal runout, reducing vibration and noise in high-speed motor pinion applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧 \u003cstrong\u003eKeyway Variants for Secure Shaft Locking\u003c\/strong\u003e\u003cbr\u003eKeyway bore options eliminate set-screw dependency for torque transmission — critical for reversing loads and high-cycle applications in CNC and automation.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod 1 Stainless Steel Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1 (Mod 1 \/ 1M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e31T – 50T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e8 mm – 20 mm (0.31 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003ePlain round bore; Keyway bore (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Sizes Available\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm (bore-dependent)\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStandard Metric Module 1 (involute)\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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (= Teeth × Module = Teeth × 1 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\u003eThe tooth count determines your gear ratio. Divide the driven gear teeth by the driving gear (pinion) teeth to get the reduction ratio. For example, a 31T pinion driving a 62T gear gives a 2:1 reduction. Choose a higher tooth count for more torque and lower speed, or a lower tooth count for higher speed with less torque. All gears in this listing are Mod 1, so any two Mod 1 gears will mesh correctly regardless of tooth count.\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\u003eMeasure your motor or drive shaft diameter precisely with calipers. Select the bore that matches your shaft — available plain round bores are 8, 10, 12, 14, 15, 16, 17, 18, 19, and 20 mm. If your shaft uses a key for torque locking, select the corresponding keyway bore variant (e.g., Keyway 12\/4×1.8 mm means a 12 mm bore with a 4 mm wide × 1.8 mm deep keyway slot).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway bore, or will a plain bore work?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor light-duty, low-torque, or unidirectional applications, a plain bore secured with a set screw is often sufficient. For reversing loads, high torque, or high-cycle applications — such as CNC axis drives or robotic joints — a keyway bore provides a positive mechanical lock that prevents rotational slip under load. If your shaft already has a machined keyway, select the matching keyway bore variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with other Mod 1 gears and racks?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All gears in this listing use the standard Mod 1 (Module 1) involute tooth profile with a 20° pressure angle, which is the global metric standard. They will mesh correctly with any other Mod 1 spur gear, pinion, or rack regardless of brand, as long as the tooth profile and module match. Do not attempt to mesh Mod 1 gears with DP (diametral pitch) imperial gears — they are not interchangeable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are stainless steel spur gears compared to steel or aluminum?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers a good balance of tensile strength (typically 515–860 MPa depending on grade), corrosion resistance, and machinability. It is stronger than aluminum and more corrosion-resistant than carbon steel, making it well-suited for environments with moisture, mild chemicals, or food-adjacent use. For extremely high-torque industrial applications, consult the specific load ratings for your tooth count and face width.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the pitch diameter and center distance for meshing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor Mod 1 gears, the pitch diameter (PD) in millimeters equals the number of teeth (e.g., a 40T gear has a 40 mm PD). The center distance between two meshing Mod 1 gears equals (PD1 + PD2) \/ 2. For example, a 31T pinion (31 mm PD) meshing with a 40T gear (40 mm PD) requires a center distance of (31 + 40) \/ 2 = 35.5 mm. This makes layout calculations straightforward for any Mod 1 pair.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel provides good corrosion resistance for outdoor, humid, and mildly wet environments. For prolonged submersion or highly corrosive chemical exposure, additional sealing or lubrication is recommended. Apply a light gear grease or oil to the tooth mesh to reduce wear and noise, especially in continuous-duty applications.\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 Mod x 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\": \"The tooth count determines your gear ratio. Divide the driven gear teeth by the driving gear (pinion) teeth to get the reduction ratio. All gears in this listing are Mod 1, so any two Mod 1 gears will mesh correctly regardless of tooth count.\"\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 that matches your shaft. Available plain round bores are 8, 10, 12, 14, 15, 16, 17, 18, 19, and 20 mm. Keyway bore variants are also available for positive shaft locking.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a keyway bore, or will a plain bore work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light-duty or unidirectional applications, a plain bore with a set screw is often sufficient. For reversing loads, high torque, or high-cycle applications, a keyway bore provides a positive mechanical lock that prevents rotational slip under load.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears compatible with other Mod 1 gears and racks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. All gears use the standard Mod 1 involute tooth profile with a 20° pressure angle and will mesh with any other Mod 1 spur gear, pinion, or rack. Do not mix with imperial DP gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are stainless steel spur gears compared to steel or aluminum?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel offers tensile strength of typically 515–860 MPa, is more corrosion-resistant than carbon steel, and stronger than aluminum — suitable for humid, wet, and food-adjacent environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the pitch diameter and center distance for meshing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For Mod 1 gears, pitch diameter in mm equals the tooth count. Center distance = (PD1 + PD2) \/ 2. For example, 31T and 40T gears require a 35.5 mm center distance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel provides good corrosion resistance for outdoor and humid environments. Apply gear grease or oil to the tooth mesh for continuous-duty applications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1M 31T \/ 8mm","offer_id":52442415333650,"sku":"GLFBDMHGLCDPJ00696x1","price":23.94,"currency_code":"USD","in_stock":true},{"title":"1M 31T \/ 10mm","offer_id":52442415366418,"sku":"GLFBDMHGLCDPJ00697x1","price":23.94,"currency_code":"USD","in_stock":true},{"title":"1M 31T \/ 12mm","offer_id":52442415399186,"sku":"GLFBDMHGLCDPJ00698x1","price":23.94,"currency_code":"USD","in_stock":true},{"title":"1M 32T \/ 8mm","offer_id":52442415431954,"sku":"GLFBDMHGLCDPJ00703x1","price":25.12,"currency_code":"USD","in_stock":true},{"title":"1M 32T \/ 10mm","offer_id":52442415464722,"sku":"GLFBDMHGLCDPJ00704x1","price":25.12,"currency_code":"USD","in_stock":true},{"title":"1M 32T \/ 12mm","offer_id":52442415497490,"sku":"GLFBDMHGLCDPJ00705x1","price":25.12,"currency_code":"USD","in_stock":true},{"title":"1M 32T \/ 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