{"product_id":"1-mod-50-teeth-spur-gear-set-screws-black-oxide-carbon-steel","title":"1 Mod 50 Teeth Spur Gear Motor Gears with Set Screws Black Oxide Carbon Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Mod 50-Tooth Spur Gear with Set Screws — Reliable Carbon Steel Drive Component\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped or undersized gear brings your motor-driven project to a halt, you need a replacement that fits precisely and holds under load. This 1 Mod 50-tooth spur gear with set screws is engineered for hobbyists, makers, and small-machine builders who demand dimensional accuracy and repeatable torque transfer without play or slippage.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from carbon steel and finished with a black oxide coating that reduces surface friction and provides baseline corrosion resistance. The module is 1 (Mod 1), tooth count is 50, and bore options span 6 mm (0.24 in) to 30 mm (1.18 in), including plain-bore and keyed variants with standard DIN keyway profiles (3×1.4 mm up to 8×3.3 mm). Set screws are included for secure shaft retention.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor output stages in CNC router Z-axes, gear-reduction stages in 3D-printer extruder drives, and custom robotic arm joints requiring a 1 Mod 50-tooth spur gear for precise angular positioning. The keyed bore variants suit applications where anti-rotation under reversing loads is critical.\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 Mod 1 (1M) spur or helical gear. Verify bore diameter and keyway dimensions against your shaft before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1 Mod 50-Tooth Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eSet Screw Retention\u003c\/strong\u003e\n\u003cp\u003eIntegrated set screw tapped into the hub locks the gear firmly onto the shaft, preventing axial and rotational slippage during operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚫\u003c\/div\u003e\n\u003cstrong\u003eBlack Oxide Carbon Steel\u003c\/strong\u003e\n\u003cp\u003eBlack oxide finish on carbon steel reduces galling and light surface oxidation while maintaining the hardness needed for sustained meshing loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eModule 1 — 50 Teeth\u003c\/strong\u003e\n\u003cp\u003eMod 1 tooth profile ensures direct interchangeability with any standard Mod 1 gear in your drivetrain. 50-tooth count delivers a defined gear ratio for speed-reduction or torque-multiplication stages.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🕳️\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Range (6–30 mm)\u003c\/strong\u003e\n\u003cp\u003ePlain-bore variants cover 6, 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 22, 24, and 25 mm. Keyed variants add standard DIN keyway profiles from 3×1.4 mm to 8×3.3 mm for shafts 8–30 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n\u003cstrong\u003eKeyed Bore Options Available\u003c\/strong\u003e\n\u003cp\u003eSelect keyed variants include precision-cut DIN keyways, enabling positive torque transmission on keyed shafts without relying solely on set screw friction.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cstrong\u003eMachined for Dimensional Accuracy\u003c\/strong\u003e\n\u003cp\u003eTooth profile and bore are machined to Mod 1 standards, ensuring consistent pitch diameter and smooth meshing with mating gears across the full tooth engagement arc.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1 Mod 50-Tooth Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e50 mm (1.97 in)\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6–30 mm (0.24–1.18 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options (plain bore or DIN keyed: 3×1.4 \/ 4×1.8 \/ 5×2.3 \/ 6×2.8 \/ 8×3.3 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFastening\u003c\/th\u003e\n\u003ctd\u003eSet Screw (included)\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 Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct bore diameter for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft's outer diameter with a caliper. Select the matching bore size from the variant dropdown. If your shaft has a keyway, choose the corresponding keyed bore variant (e.g., 10 mm shaft with a 3×1.4 mm keyway → select \"10mm Keyway (3×1.4mm)\"). A plain bore with a set screw is sufficient for most low-to-medium torque applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod 1 gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any gear marked Mod 1 (or 1M) with a 20° pressure angle will mesh correctly with this 50-tooth spur gear. Confirm the pressure angle of your mating gear before assembly — mixing 14.5° and 20° pressure angles causes poor contact and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the advantage of the keyed bore over a plain bore with set screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA keyed bore provides positive mechanical engagement between the gear and shaft, preventing rotation under reversing or shock loads where a set screw alone might loosen over time. For continuous-duty or high-torque applications, keyed variants are the more reliable choice. Plain bore with set screw is adequate for lighter, unidirectional loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs the black oxide finish sufficient for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides light corrosion resistance suitable for indoor and controlled environments. For outdoor, wet, or high-humidity applications, apply a light machine oil or grease to the gear surfaces after installation. For fully corrosion-resistant requirements, consider stainless steel alternatives.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat gear ratio does a 50-tooth Mod 1 gear produce when paired with a smaller pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio equals the tooth count of the driven gear divided by the tooth count of the driving pinion. For example, pairing this 50-tooth gear with a 10-tooth pinion gives a 5:1 reduction ratio — the output shaft turns at 1\/5 the input speed with 5× the torque (minus friction losses).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a 3D printer extruder or CNC drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This 1 Mod 50-tooth spur gear is well-suited for extruder gear stages, CNC axis drives, and robotic joint assemblies where a Mod 1 gear train is already in use. Verify the bore matches your motor or idler shaft diameter and confirm the face width clears your frame geometry before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes the set screw require a specific tool or thread size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSet screws on gears in this size range typically use a hex (Allen) key drive. The exact thread size and key size depend on the bore variant selected. Contact us to confirm the set screw specification for your chosen variant before assembly.\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 Hole 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 correct bore diameter for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft's outer diameter with a caliper. Select the matching bore size from the variant dropdown. If your shaft has a keyway, choose the corresponding keyed bore variant. A plain bore with a set screw is sufficient for most low-to-medium torque applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 1 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any gear marked Mod 1 (or 1M) with a 20° pressure angle will mesh correctly with this 50-tooth spur gear. Confirm the pressure angle of your mating gear before assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the advantage of the keyed bore over a plain bore with set screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A keyed bore provides positive mechanical engagement between the gear and shaft, preventing rotation under reversing or shock loads where a set screw alone might loosen over time. For continuous-duty or high-torque applications, keyed variants are the more reliable choice.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the black oxide finish sufficient for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides light corrosion resistance suitable for indoor and controlled environments. For outdoor or high-humidity applications, apply a light machine oil or grease after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What gear ratio does a 50-tooth Mod 1 gear produce when paired with a smaller pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gear ratio equals the tooth count of the driven gear divided by the tooth count of the driving pinion. Pairing this 50-tooth gear with a 10-tooth pinion gives a 5:1 reduction ratio.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a 3D printer extruder or CNC drive system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This 1 Mod 50-tooth spur gear is well-suited for extruder gear stages, CNC axis drives, and robotic joint assemblies where a Mod 1 gear train is already in use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the set screw require a specific tool or thread size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Set screws on gears in this size range typically use a hex (Allen) key drive. Contact us to confirm the set screw specification for your chosen variant before assembly.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"6mm","offer_id":52441935315218,"sku":"GLFBNHHGLBZSJ057610x1","price":22.97,"currency_code":"USD","in_stock":true},{"title":"8mm","offer_id":52441935347986,"sku":"GLFBNHHGLBZSJ057611x1","price":22.97,"currency_code":"USD","in_stock":true},{"title":"10mm","offer_id":52441935380754,"sku":"GLFBNHHGLBZSJ057612x1","price":22.97,"currency_code":"USD","in_stock":true},{"title":"12mm","offer_id":52441935413522,"sku":"GLFBNHHGLBZSJ057613x1","price":22.97,"currency_code":"USD","in_stock":true},{"title":"14mm","offer_id":52441935446290,"sku":"GLFBNHHGLCDPJ01084x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"15mm","offer_id":52441935479058,"sku":"GLFBNHHGLBZSJ057614x1","price":22.97,"currency_code":"USD","in_stock":true},{"title":"16mm","offer_id":52441935511826,"sku":"GLFBNHHGLCDPJ01085x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"17mm","offer_id":52441935544594,"sku":"GLFBNHHGLCDPJ01086x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"18mm","offer_id":52441935577362,"sku":"GLFBNHHGLCDPJ01087x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"19mm","offer_id":52441935610130,"sku":"GLFBNHHGLCDPJ01088x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"20mm","offer_id":52441935642898,"sku":"GLFBNHHGLCDPJ01089x1","price":24.28,"currency_code":"USD","in_stock":true},{"title":"22mm","offer_id":52441935675666,"sku":"GLFBNHHGLBZSJ057615x1","price":23.11,"currency_code":"USD","in_stock":true},{"title":"24mm","offer_id":52441935708434,"sku":"GLFBNHHGLBZSJ057616x1","price":23.11,"currency_code":"USD","in_stock":true},{"title":"25mm","offer_id":52441935741202,"sku":"GLFBNHHGLBZSJ057617x1","price":23.11,"currency_code":"USD","in_stock":true},{"title":"8mm Keyway (3x1.4mm)","offer_id":52441935773970,"sku":"GLFBNHHGLCDPJ01090x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"10mm Keyway (3x1.4mm)","offer_id":52441935806738,"sku":"GLFBNHHGLCDPJ01091x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"10mm Keyway (4x1.8mm)","offer_id":52441935839506,"sku":"GLFBNHHGLCDPJ01092x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"12mm Keyway (4x1.8mm)","offer_id":52441935872274,"sku":"GLFBNHHGLCDPJ01093x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"14mm Keyway (5x2.3mm)","offer_id":52441935905042,"sku":"GLFBNHHGLCDPJ01094x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"15mm Keyway (5x2.3mm)","offer_id":52441935937810,"sku":"GLFBNHHGLCDPJ01095x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"16mm Keyway (5x2.3mm)","offer_id":52441935970578,"sku":"GLFBNHHGLCDPJ01096x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"17mm Keyway (5x2.3mm)","offer_id":52441936003346,"sku":"GLFBNHHGLCDPJ01097x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"18mm Keyway (6x2.8mm)","offer_id":52441936036114,"sku":"GLFBNHHGLCDPJ01098x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"19mm Keyway (6x2.8mm)","offer_id":52441936068882,"sku":"GLFBNHHGLCDPJ01099x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"20mm Keyway (6x2.8mm)","offer_id":52441936101650,"sku":"GLFBNHHGLCDPJ01100x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"22mm Keyway (6x2.8mm)","offer_id":52441936134418,"sku":"GLFBNHHGLCDPJ01101x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"24mm Keyway (8x3.3mm)","offer_id":52441936167186,"sku":"GLFBNHHGLCDPJ01102x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"25mm Keyway (8x3.3mm)","offer_id":52441936199954,"sku":"GLFBNHHGLCDPJ01103x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"28mm Keyway (8x3.3mm)","offer_id":52441936232722,"sku":"GLFBNHHGLCDPJ01104x1","price":24.68,"currency_code":"USD","in_stock":true},{"title":"30mm Keyway (8x3.3mm)","offer_id":52441936265490,"sku":"GLFBNHHGLCDPJ01105x1","price":24.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of9_f6ef5803-7e34-4f84-9047-046b119ca7a2.jpg?v=1783585332","url":"https:\/\/homediyer.com\/products\/1-mod-50-teeth-spur-gear-set-screws-black-oxide-carbon-steel","provider":"HomeDIYer","version":"1.0","type":"link"}