{"product_id":"mod1-5-steel-pinion-gear-spur-gear-12-100-teeth-4-25mm-bore-with-screw-blackened","title":"Mod1.5 Steel Pinion Gear Spur Gear 12-100 Teeth 4-25mm Bore With Screw Blackened","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod1.5 Steel Spur Gear — Precision Blackened Pinion Gear for Reliable Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your project demands a gear that fits exactly right and holds up under load, a mismatched or undersized spur gear can bring everything to a halt. Whether you are building a CNC machine, a robotic arm, a custom RC drivetrain, or a motorized DIY mechanism, this Mod1.5 steel spur gear gives engineers, makers, and hobbyists a dependable solution with a wide selection of tooth counts and bore sizes.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from carbon steel and finished with a blackening (oxide) treatment for corrosion resistance and a clean, professional appearance. The tooth count ranges from 12T to 100T, and bore diameters span 4 mm (approx. 0.16 in) to 25 mm (approx. 0.98 in), including keyhole variants for keyed shaft applications. A set screw is included to secure the gear firmly to the shaft.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include spur gear reduction stages in 3D printer extruder drives, gear rack and pinion linear actuators, small industrial conveyor drives, and custom robotics joint assemblies — anywhere a Mod1.5 pitch gear is specified.\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 Mod 1.5 pitch standard. Meshes with any Mod1.5 rack, pinion, or mating spur gear. Verify bore diameter and tooth count match your shaft and gear ratio requirements before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Mod1.5 Steel 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\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003eAvailable from 12T to 100T, covering a broad range of gear ratios for speed reduction or torque multiplication in your drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n\u003cstrong\u003eMultiple Bore Sizes\u003c\/strong\u003e\n\u003cp\u003eBore options from 4 mm to 25 mm, plus keyhole variants (e.g. 8×3×1.4 mm, 10×4×1.8 mm, 12×5×2.3 mm) for keyed shaft compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eBlackened Steel Construction\u003c\/strong\u003e\n\u003cp\u003eCarbon steel body with oxide blackening treatment provides corrosion resistance and reduces light reflection in precision assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eSet Screw Included\u003c\/strong\u003e\n\u003cp\u003eEach gear ships with a set screw for secure shaft mounting without additional hardware, saving time during assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eMod1.5 Standard Pitch\u003c\/strong\u003e\n\u003cp\u003eConforms to the Mod1.5 metric gear standard, ensuring accurate meshing with compatible racks, pinions, and mating gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cstrong\u003eVersatile Application Range\u003c\/strong\u003e\n\u003cp\u003eSuitable for robotics, CNC machines, RC vehicles, 3D printers, conveyor systems, and custom DIY mechanical projects requiring reliable power transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Mod1.5 Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e12T – 100T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm – 25 mm; keyhole variants available (see variant options)\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 Treatment\u003c\/th\u003e\n\u003ctd\u003eBlackening (oxide treatment)\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (Mod × Teeth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\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 teeth to get the ratio. For example, a 12T pinion driving a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed output and a larger count for more torque.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the bore diameter that matches your shaft diameter exactly. For round shafts, choose the plain bore (e.g. 8 mm, 10 mm). For keyed shafts, select the keyhole variant that matches your key dimensions (e.g. 8×3×1.4 mm means 8 mm bore with a 3 mm wide × 1.4 mm deep keyway).\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 carbon steel, which offers good tensile strength and wear resistance for moderate-duty applications such as robotics, CNC, and RC drivetrains. For continuous heavy industrial loads, verify the gear's rated torque against your application requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes the blackening treatment prevent rust?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe oxide blackening treatment provides a degree of corrosion resistance and is suitable for indoor and low-humidity environments. For outdoor or high-moisture applications, applying a light machine oil or grease to the gear surface is recommended for additional protection.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod1.5 rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any Mod1.5 gear or rack with a matching 20° pressure angle will mesh correctly with these gears. Confirm the module and pressure angle of your existing components before ordering to ensure compatibility.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs the set screw sufficient to hold the gear on the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe included set screw is suitable for most light-to-medium duty applications. For high-torque or high-vibration environments, consider using a keyhole bore variant with a matching key, or applying thread-locking compound to the set screw for additional security.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears in a 3D printer or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Mod1.5 steel spur gears are commonly used in 3D printer extruder drives, CNC axis drives, and similar precision motion applications. Select the tooth count and bore size that match your motor shaft and desired gear ratio.\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 NO. of Teeth and Bore (mm) 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 teeth to get the ratio. For example, a 12T pinion driving a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed output and a larger count for more torque.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore size should I select for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the bore diameter that matches your shaft diameter exactly. For round shafts, choose the plain bore (e.g. 8 mm, 10 mm). For keyed shafts, select the keyhole variant that matches your key dimensions.\"\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 carbon steel, which offers good tensile strength and wear resistance for moderate-duty applications such as robotics, CNC, and RC drivetrains.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the blackening treatment prevent rust?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The oxide blackening treatment provides a degree of corrosion resistance suitable for indoor and low-humidity environments. For outdoor or high-moisture applications, applying a light machine oil or grease is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod1.5 rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any Mod1.5 gear or rack with a matching 20° pressure angle will mesh correctly with these gears.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the set screw sufficient to hold the gear on the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The included set screw is suitable for most light-to-medium duty applications. For high-torque or high-vibration environments, consider using a keyhole bore variant with a matching key.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Mod1.5 steel spur gears are commonly used in 3D printer extruder drives, CNC axis drives, and similar precision motion applications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"12T \/ 5mm \/ 1PCS","offer_id":52442358743314,"sku":"TJJTCD00769x1","price":3.66,"currency_code":"USD","in_stock":true},{"title":"12T \/ 6mm \/ 1PCS","offer_id":52442358776082,"sku":"TJJTCD00770x1","price":3.66,"currency_code":"USD","in_stock":true},{"title":"12T \/ 6.35mm \/ 1PCS","offer_id":52442358808850,"sku":"TJJTCD00771x1","price":3.66,"currency_code":"USD","in_stock":true},{"title":"12T \/ 7mm \/ 1PCS","offer_id":52442358841618,"sku":"TJJTCD00772x1","price":3.66,"currency_code":"USD","in_stock":true},{"title":"12T \/ 8mm \/ 1PCS","offer_id":52442358874386,"sku":"TJJTCD00773x1","price":3.66,"currency_code":"USD","in_stock":true},{"title":"14T \/ 4mm \/ 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