{"product_id":"1-mod-45-steel-pinion-spur-gears-12-42-teeth-5-16mm-bore","title":"1 Mod 45# Steel Pinion Spur Gears 12-42 Teeth 5-16mm Bore With Screw Hard Tooth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1 Mod 45# Steel Spur Gears — Reliable Pinion Gears for Precision Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear brings your build to a halt, you need a replacement you can trust. These 1 Mod 45# steel spur gears are engineered for makers, robotics builders, CNC hobbyists, and RC enthusiasts who demand consistent tooth engagement and long service life from every component in their drivetrain.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel and features a hardened tooth profile for wear resistance. The bore diameter ranges from 5 mm (0.197 in) to 16 mm (0.630 in), and tooth counts span 12T to 42T, giving you a wide selection to match your gear ratio requirements. A radial set screw is included on every gear to lock the bore securely onto the shaft.\u003c\/p\u003e\n    \u003cp\u003eThese 1 mod pinion spur gears suit a broad range of applications: compact robot joint actuators requiring a specific reduction ratio, DIY CNC axis drives where backlash must be minimised, and RC car or truck transmission upgrades where a harder tooth surface extends gear life under load.\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 1 (Mod 1) gear systems. Mates with any standard Mod 1 rack, pinion, or mating spur gear. Verify bore diameter matches your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from 45# steel for a balance of toughness and machinability, delivering reliable torque transmission without brittle failure under shock loads.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\n        \u003cstrong\u003eHard Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eThe tooth surface is hardened to resist wear and pitting, extending service intervals in continuous-duty or high-cycle applications such as CNC drives and robotic joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Range — 12T to 42T\u003c\/strong\u003e\n        \u003cp\u003eEighteen tooth-count options let you dial in the exact gear ratio your drivetrain needs, from high-speed pinion configurations to torque-multiplying reduction stages.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore Sizes — 5 mm to 16 mm\u003c\/strong\u003e\n        \u003cp\u003eTen bore diameter options (5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16 mm) cover the most common shaft sizes used in hobby motors, stepper motors, and servo output shafts.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eIncluded Set Screw for Secure Shaft Locking\u003c\/strong\u003e\n        \u003cp\u003eEach gear ships with a radial set screw pre-tapped into the hub, allowing tool-free alignment and a firm, slip-resistant connection to the drive shaft.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eStandard Module 1 Tooth Form\u003c\/strong\u003e\n        \u003cp\u003eConforms to the international Module 1 standard, ensuring direct interchangeability with Mod 1 racks, idler gears, and mating pinions from any compatible source.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 1 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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eHard Tooth (surface hardened)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e12T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 33T, 35T, 36T, 38T, 40T, 42T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 mm \/ 6 mm \/ 6.35 mm \/ 7 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm \/ 16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter (inches)\u003c\/th\u003e\n\u003ctd\u003e0.197\" \/ 0.236\" \/ 0.250\" \/ 0.276\" \/ 0.315\" \/ 0.394\" \/ 0.472\" \/ 0.551\" \/ 0.591\" \/ 0.630\"\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\u003eShaft Locking Method\u003c\/th\u003e\n\u003ctd\u003eRadial set screw (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal spur gear (pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\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 right number of teeth for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio between two meshing gears equals the driven gear tooth count divided by the driving (pinion) gear tooth count. For example, pairing a 12T pinion with a 36T gear gives a 3:1 reduction. Choose a lower tooth count for higher speed output and a higher tooth count for more torque. Always verify that both gears share the same module (Mod 1) so the teeth mesh correctly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore diameter should I select for my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or shaft diameter with a calliper before ordering. Common stepper motor shafts are 5 mm or 6.35 mm (1\/4\"), hobby DC motor shafts are typically 3–6 mm, and servo output shafts vary by brand. Select the bore that matches your shaft exactly — a loose bore will cause slippage even with the set screw tightened.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are machined from 45# medium-carbon steel with a hardened tooth surface, making them significantly more durable than plastic or sintered-metal alternatives. They are suitable for moderate-duty continuous operation in robotics, CNC, and RC applications. For very high-torque or shock-load environments, consider a larger module or a helical gear design.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has moderate corrosion resistance. For indoor or dry environments, the bare steel finish is adequate with periodic light lubrication. For humid, outdoor, or wash-down environments, apply a thin coat of grease or consider a corrosion-inhibiting lubricant to extend service life. If corrosion resistance is a primary requirement, stainless steel or plastic gears may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Mod 1 rack or gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack labelled Module 1 (Mod 1) with a 20° pressure angle will mesh correctly with these gears. Module 1 is an international standard, so compatibility is determined by the module number, not the brand. Do not mix with Mod 0.8, Mod 1.25, or other module sizes, as the tooth profiles will not engage properly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install the gear onto the shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide the gear onto the shaft so the set screw hole aligns with a flat on the shaft (if present) or positions over the desired locking point. Use an appropriate hex key (Allen key) to tighten the set screw firmly. For shafts without a flat, tightening the set screw against the round shaft surface is sufficient for light-to-moderate loads; adding a shaft flat with a file improves holding strength for higher torques.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a multi-stage gearbox?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Because all gears in this listing share the same Mod 1 standard, you can combine different tooth counts across multiple stages to achieve compound gear ratios. Ensure adequate centre-distance spacing between each gear pair and use appropriate shaft supports (bearings or bushings) to maintain alignment under load.\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 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 gear ratio between two meshing gears equals the driven gear tooth count divided by the driving (pinion) gear tooth count. For example, pairing a 12T pinion with a 36T gear gives a 3:1 reduction. Choose a lower tooth count for higher speed output and a higher tooth count for more torque. Always verify that both gears share the same module (Mod 1) so the teeth mesh correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore diameter should I select for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or shaft diameter with a calliper before ordering. Common stepper motor shafts are 5 mm or 6.35 mm (1\/4\\\"), hobby DC motor shafts are typically 3–6 mm, and servo output shafts vary by brand. Select the bore that matches your shaft exactly — a loose bore will cause slippage even with the set screw tightened.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are machined from 45# medium-carbon steel with a hardened tooth surface, making them significantly more durable than plastic or sintered-metal alternatives. They are suitable for moderate-duty continuous operation in robotics, CNC, and RC applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has moderate corrosion resistance. For indoor or dry environments, the bare steel finish is adequate with periodic light lubrication. For humid or outdoor environments, apply a thin coat of grease or a corrosion-inhibiting lubricant to extend service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing Mod 1 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack labelled Module 1 (Mod 1) with a 20° pressure angle will mesh correctly with these gears. Do not mix with Mod 0.8, Mod 1.25, or other module sizes, as the tooth profiles will not engage properly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install the gear onto the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide the gear onto the shaft so the set screw hole aligns with a flat on the shaft (if present). Use an appropriate hex key to tighten the set screw firmly. For shafts without a flat, tightening against the round shaft surface is sufficient for light-to-moderate loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a multi-stage gearbox?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Because all gears in this listing share the same Mod 1 standard, you can combine different tooth counts across multiple stages to achieve compound gear ratios. Ensure adequate centre-distance spacing and use appropriate shaft supports to maintain alignment under load.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod \/ 12T \/ 5mm","offer_id":52442089095442,"sku":"QTLJJGJXCD0140x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 12T \/ 6mm","offer_id":52442089128210,"sku":"QTLJJGJXCD0141x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 15T \/ 5mm","offer_id":52442089160978,"sku":"QTLJJGJXCD0142x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 15T \/ 6mm","offer_id":52442089193746,"sku":"QTLJJGJXCD0143x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 15T \/ 8mm","offer_id":52442089226514,"sku":"QTLJJGJXCD0144x1","price":10.85,"currency_code":"USD","in_stock":true},{"title":"1 Mod \/ 16T \/ 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