{"product_id":"1-5-mod-spur-gear-gear-racks-15-50-tooth-45-carbon-steel","title":"1.5 Mod Spur Gear \u0026 Gear Racks 15 - 50 Tooth Transmission Gear 45# Carbon Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Mod Spur Gear \u0026amp; Gear Rack — Precision 45# Carbon Steel Transmission Components\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched gear brings your CNC router, linear actuator, or automation rig to a halt, you need a replacement you can trust to mesh cleanly and hold torque. These 1.5 mod spur gears and gear racks are engineered for makers, machine builders, and small-shop fabricators who demand dimensional accuracy and consistent performance across every tooth.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# carbon steel — a medium-carbon alloy known for its balance of hardness and machinability. The module is 1.5 (pitch = 4.712 mm \/ ~0.1855 in), with tooth counts spanning 15T through 50T. Bore diameter and face width vary by tooth count; see variant options for exact dimensions. Gear racks in this series share the same 1.5 mod tooth profile for direct compatibility.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC gantry drives requiring a 1.5 mod rack-and-pinion linear motion system, rotary indexing tables needing a compact spur gear set for stepper or servo coupling, and DIY robotics joints where a low-backlash 45 steel gear withstands repeated load cycles without deformation.\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 1.5 (Mod 1.5) gear systems. Meshes with any standard 1.5 mod mating gear or rack. Verify bore diameter against your shaft size before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1.5 Mod Spur Gears \u0026amp; Gear Racks\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from medium-carbon 45# steel for a reliable combination of surface hardness and core toughness — resists tooth deformation under sustained load.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 1.5 Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStandard Mod 1.5 involute tooth geometry ensures smooth meshing and interchangeability with any other 1.5 mod gear or rack in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\n\u003cstrong\u003eWide Tooth-Count Range (15T – 50T)\u003c\/strong\u003e\n\u003cp\u003eThirty-six size options from 15 to 50 teeth let you dial in the exact gear ratio needed for your CNC, robotics, or automation application without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n\u003cstrong\u003eRack-and-Pinion Ready\u003c\/strong\u003e\n\u003cp\u003eGear racks share the same 1.5 mod profile, enabling direct rack-and-pinion pairing for linear motion stages, laser cutters, and plasma table gantries.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n\u003cstrong\u003eConsistent Dimensional Accuracy\u003c\/strong\u003e\n\u003cp\u003eTooth pitch and pressure angle are held to standard tolerances, reducing backlash and ensuring repeatable positioning in closed-loop servo and stepper systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e\n\u003cp\u003eSuitable for CNC routers, 3D printer extruder drives, rotary tables, conveyor indexers, and general-purpose power transmission where a compact spur gear is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1.5 Mod Spur Gear \u0026amp; Gear Rack\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\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e15T – 50T (36 variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch (circular)\u003c\/th\u003e\n\u003ctd\u003e4.712 mm (~0.1855 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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\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\u003ctr\u003e\n\u003cth\u003eBore 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\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e22.5 mm (15T) – 75 mm (50T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter Range\u003c\/th\u003e\n\u003ctd\u003eApprox. 25.5 mm (15T) – 78 mm (50T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC, robotics, automation, linear motion\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\u003eSelect your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, a 30T pinion driving a 15T gear gives a 2:1 speed increase. If you are replacing an existing gear, match the tooth count and module (1.5) exactly. For rack-and-pinion linear motion, the pinion tooth count determines linear travel per revolution: travel = π × module × teeth = π × 1.5 × T mm per revolution.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is Module 1.5 and is it compatible with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the standard metric gear sizing system. Mod 1.5 means the pitch diameter equals 1.5 mm × number of teeth. Two gears mesh correctly only if they share the same module and pressure angle (20° for this series). If your existing gear is labeled Mod 1.5 or M1.5, these gears are directly compatible. Imperial DP (diametral pitch) gears are not interchangeable with metric module gears.\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\u003e45# carbon steel offers a tensile strength of approximately 600–700 MPa and yield strength around 355 MPa in the normalized condition. For light-to-medium CNC and automation loads these gears perform reliably. For heavy shock loads or continuous high-torque applications, consider adding a keyway or set-screw bore modification, and verify your torque requirements against the gear's face width and pitch diameter.\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# carbon steel is not inherently corrosion resistant. For indoor CNC and dry automation environments, standard lubrication (grease or gear oil) provides adequate protection. For humid or outdoor environments, apply a rust-inhibiting coating or consider periodic re-lubrication. If corrosion resistance is critical, contact us to confirm finish options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter do these gears have, and can I modify it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and is listed in the variant options. 45# carbon steel is machinable, so the bore can be enlarged, keyed, or tapped by a machine shop if the standard bore does not match your shaft. Always confirm the remaining wall thickness is sufficient for your torque load before modifying.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears for a rack-and-pinion linear motion system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The gear racks in this 1.5 mod series share the same tooth profile and pressure angle as the spur gears, making them directly compatible for rack-and-pinion drives. Linear travel per motor revolution = π × 1.5 mm × pinion tooth count. For example, a 20T pinion produces approximately 94.25 mm of linear travel per revolution. Mount the rack securely and ensure the pinion center distance is set to the standard pitch radius for minimal backlash.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to lubricate these gears, and how often?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, lubrication extends gear life significantly. Apply a thin layer of lithium-based grease or gear oil to the tooth faces before first use. For CNC routers and automation systems running daily, re-lubricate every 3–6 months or whenever you notice increased noise or resistance. Avoid over-greasing, which can attract dust and abrasive particles.\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 Size (tooth count) 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 your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For rack-and-pinion linear motion, travel per revolution = π × 1.5 × tooth count mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is Module 1.5 and is it compatible with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module 1.5 means pitch diameter = 1.5 mm × number of teeth. Gears mesh correctly only if they share the same module (1.5) and pressure angle (20°). Imperial DP gears are not interchangeable with metric module gears.\"\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 tensile strength of approximately 600–700 MPa and yield strength around 355 MPa. Suitable for light-to-medium CNC and automation loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion resistant. Use lubrication for indoor environments. Apply rust-inhibiting coating for humid or outdoor use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter do these gears have, and can I modify it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bore diameter varies by tooth count — see variant options. The 45# carbon steel is machinable and can be bored, keyed, or tapped by a machine shop.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears for a rack-and-pinion linear motion system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 1.5 mod gear racks share the same tooth profile and pressure angle. Linear travel per revolution = π × 1.5 mm × pinion tooth count.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to lubricate these gears, and how often?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Apply lithium-based grease or gear oil before first use. Re-lubricate every 3–6 months for daily-use CNC and automation systems.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M 15T \/ 1 pcs","offer_id":52442720633106,"sku":"GYWYPSHXJZC3324x1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"1.5M 16T \/ 1 pcs","offer_id":52442720665874,"sku":"GYWYPSHXJZC3325x1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"1.5M 17T \/ 1 pcs","offer_id":52442720698642,"sku":"GYWYPSHXJZC3326x1","price":8.42,"currency_code":"USD","in_stock":true},{"title":"1.5M 18T \/ 1 pcs","offer_id":52442720731410,"sku":"GYWYPSHXJZC3327x1","price":7.47,"currency_code":"USD","in_stock":true},{"title":"1.5M 19T \/ 1 pcs","offer_id":52442720764178,"sku":"GYWYPSHXJZC3328x1","price":9.78,"currency_code":"USD","in_stock":true},{"title":"1.5M 20T \/ 1 pcs","offer_id":52442720796946,"sku":"GYWYPSHXJZC3329x1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"1.5M 21T \/ 1 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