{"product_id":"mod-1-5-steel-45-unquenched-spur-pinion-gear-12-50-teeth-motor-gear-5-25mm-bore","title":"Mod 1.5 Steel 45# Unquenched Spur Pinion Gear 12-50 Teeth Motor Gear 5-25mm Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 1.5 Spur Pinion Gear — Reliable Power Transmission for Motors \u0026amp; Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a mismatched or undersized gear causes slippage, noise, or premature wear in your motor drive or CNC build, the root cause is almost always an incorrect module or bore size. Engineers, robotics builders, and machine tool hobbyists who need a dependable, drop-in spur pinion gear will find this Mod 1.5 steel 45# gear a straightforward solution — available in 12 to 50 teeth and bore sizes from 5 mm to 25 mm to match a wide range of motor shafts.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel in an unquenched (non-heat-treated) condition, offering good machinability for secondary operations such as keyway cutting or set-screw drilling. The module is 1.5 (metric), with a 20° pressure angle conforming to standard spur gear geometry. Tooth height is 12 mm across all variants. Outer diameter scales with tooth count — ranging from approximately 21 mm (0.83 in) for the 12T up to approximately 78 mm (3.07 in) for the 50T.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DC motor pinion replacement in CNC router Z-axis drives, stepper motor output gears in 3D printer extruder assemblies, and small gearbox reduction stages in robotic arm joints — all applications where a standard Mod 1.5 metric spur pinion gear with a precise bore fit 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 Fits any mating Mod 1.5 spur gear with a 20° pressure angle. Verify shaft diameter before ordering — bore options: 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 20 \/ 25 mm.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 1.5 Spur Pinion 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# carbon steel for a solid balance of strength and machinability — suitable for moderate-load motor and drive applications.\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 50T\u003c\/strong\u003e\n\u003cp\u003eEight tooth-count options let you dial in the exact gear ratio needed for your motor drive, CNC axis, or robotic joint without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eBroad Bore Selection: 5–25 mm\u003c\/strong\u003e\n\u003cp\u003eThirteen bore sizes cover the most common motor shaft diameters, including the 6.35 mm (1\/4 in) size popular in North American stepper motors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eStandard Mod 1.5 \/ 20° Pressure Angle\u003c\/strong\u003e\n\u003cp\u003eConforms to ISO metric spur gear standards, ensuring direct interchangeability with any mating Mod 1.5 gear from any source.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n\u003cstrong\u003eUnquenched for Easy Secondary Machining\u003c\/strong\u003e\n\u003cp\u003eThe unquenched (non-hardened) condition means you can drill set-screw holes, cut keyways, or turn the bore to a custom fit without specialist tooling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003e12 mm Tooth Height Across All Variants\u003c\/strong\u003e\n\u003cp\u003eConsistent face width simplifies stack-up calculations and allows mixing of different tooth-count gears on the same shaft centerline.\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 1.5 Spur Pinion Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5 (Metric)\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\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e12T \/ 15T \/ 20T \/ 25T \/ 30T \/ 35T \/ 40T \/ 50T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Options\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 20 \/ 25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Height (Face Width)\u003c\/th\u003e\n\u003ctd\u003e12 mm (0.47 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003eApprox. 21 mm – 78 mm (0.83 in – 3.07 in), varies by tooth count\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\u003eHeat Treatment\u003c\/th\u003e\n\u003ctd\u003eUnquenched (non-hardened)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur (straight tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub \/ Set Screw\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\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 the tooth count based on your required gear ratio. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, pairing a 15T pinion with a 45T gear gives a 3:1 reduction. If you are replacing an existing gear, match the tooth count exactly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\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 shaft diameter with a caliper. Common sizes include 5 mm and 6 mm for small DC motors, 6.35 mm (1\/4 in) for NEMA stepper motors, and 8–20 mm for larger servo or gearmotor shafts. Choose the bore that matches your shaft — a bore that is too large will require a bushing or set-screw fix.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with other Mod 1.5 gears I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any two spur gears with the same module (1.5) and the same pressure angle (20°) will mesh correctly regardless of brand or tooth count. Verify both the module and pressure angle of your existing gear before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I cut a keyway or drill a set-screw hole in these gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Because these gears are supplied in an unquenched (non-hardened) condition, the steel is soft enough to machine with standard HSS tooling. You can drill radial set-screw holes or mill a keyway without needing carbide tooling or EDM.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has a tensile strength of approximately 600–700 MPa in the unquenched condition. For moderate-load motor pinion applications — such as CNC axis drives, 3D printer extruders, and light robotic joints — this is typically sufficient. For high-shock or continuous heavy-load applications, consider a quenched-and-tempered or case-hardened gear instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these gears resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has limited inherent corrosion resistance. For indoor or dry environments this is generally acceptable with light lubrication. For humid, wet, or outdoor environments, apply a rust-inhibiting grease or consider a stainless steel or zinc-plated alternative.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication should I use with these spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA light machine oil or gear grease applied to the tooth flanks is recommended for most applications. For enclosed gearboxes, an ISO VG 68–150 gear oil is suitable. Avoid dry running, which accelerates tooth wear on unquenched steel gears.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Mod x Teeth 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 the tooth count based on your required gear ratio. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, pairing a 15T pinion with a 45T gear gives a 3:1 reduction. If you are replacing an existing gear, match the tooth count exactly.\"\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 shaft diameter with a caliper. Common sizes include 5 mm and 6 mm for small DC motors, 6.35 mm (1\/4 in) for NEMA stepper motors, and 8–20 mm for larger servo or gearmotor shafts. Choose the bore that matches your shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears compatible with other Mod 1.5 gears I already have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two spur gears with the same module (1.5) and the same pressure angle (20°) will mesh correctly regardless of brand or tooth count.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut a keyway or drill a set-screw hole in these gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Because these gears are supplied in an unquenched (non-hardened) condition, the steel is soft enough to machine with standard HSS tooling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has a tensile strength of approximately 600–700 MPa in the unquenched condition, suitable for moderate-load motor pinion applications such as CNC axis drives and light robotic joints.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these gears resist corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has limited inherent corrosion resistance. Apply a rust-inhibiting grease for humid or wet environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication should I use with these spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A light machine oil or gear grease applied to the tooth flanks is recommended. For enclosed gearboxes, an ISO VG 68–150 gear oil is suitable. Avoid dry running.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M 12T \/ 5mm \/ 12mm","offer_id":52442398621970,"sku":"GLFBDMHGLBZSJ057770x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T \/ 6mm \/ 12mm","offer_id":52442398654738,"sku":"GLFBDMHGLBZSJ057771x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T \/ 6.35mm \/ 12mm","offer_id":52442398687506,"sku":"GLFBDMHGLBZSJ057772x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T \/ 7mm \/ 12mm","offer_id":52442398720274,"sku":"GLFBDMHGLBZSJ057773x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T \/ 8mm \/ 12mm","offer_id":52442398753042,"sku":"GLFBDMHGLBZSJ057774x1","price":10.66,"currency_code":"USD","in_stock":true},{"title":"1.5M 15T \/ 5mm \/ 12mm","offer_id":52442398785810,"sku":"GLFBDMHGLBZSJ057775x1","price":11.74,"currency_code":"USD","in_stock":true},{"title":"1.5M 15T \/ 6mm \/ 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