{"product_id":"1-5-mod-spur-gear-45-steel-transmission-gear-50t-80t-teeth-with-step-motor-gear","title":"1.5 Mod Spur Gear 45# Steel Transmission Gear 50T-80T Teeth With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Mod Spur Gear — 45# Steel Transmission Gear for Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your DIY CNC router, 3D printer gantry, or automation rig demands precise, slip-free power transfer, a poorly matched gear becomes the weakest link in the chain. Makers, workshop engineers, and small-batch machine builders who need reliable metric spur gears will find this 1.5 mod spur gear engineered to handle the torque without the drama.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The module is 1.5 (metric), with tooth counts ranging from 50T to 80T and outer diameters spanning approximately 76.5 mm to 123 mm (3.01\"–4.84\"). Bore diameters are available from 8 mm to 25 mm (0.31\"–0.98\"), and the step diameter is 50 mm across all variants. Tooth profile follows the standard 20° pressure angle involute form.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper motor drive trains in DIY CNC machines, rotary indexing tables for small-batch machining, and gear reduction stages in custom conveyor or feed systems — all scenarios where a 1.5 mod steel spur gear with a keyed or set-screw bore delivers consistent mesh and long service life.\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 to mesh with any standard 1.5 module (Mod 1.5) spur gear. Bore sizes 8–25 mm suit NEMA 17, NEMA 23, and NEMA 34 stepper motor shafts as well as common servo and DC motor output shafts. Step diameter 50 mm on all variants.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1.5 Mod Spur Gears\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# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# steel for a reliable combination of surface hardness and core toughness — resists wear under sustained mesh loads without becoming brittle.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eStandard 1.5 Module, 20° Pressure Angle\u003c\/strong\u003e\n\u003cp\u003eFully interchangeable with any Mod 1.5 gear in your drivetrain. The 20° involute tooth profile ensures smooth engagement and even load distribution across the full tooth face.\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: 50T to 80T\u003c\/strong\u003e\n\u003cp\u003eFive tooth-count options (50T, 60T, 65T, 70T, 80T) let you dial in the exact gear ratio your project needs — from moderate reduction to finer speed control.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eMulti-Bore Options: 8 mm to 25 mm\u003c\/strong\u003e\n\u003cp\u003eEight bore diameter choices cover the most common stepper and servo motor shaft sizes, reducing the need for custom adapters or bushings in your build.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eSingle or Twin-Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1 pc for a single-axis build or 2 pcs for paired-axis machines and mirrored drive setups — both options ship as a matched set from the same production batch.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n\u003cstrong\u003eStep Hub Design for Secure Shaft Seating\u003c\/strong\u003e\n\u003cp\u003eThe 50 mm step diameter hub provides a positive shoulder for axial positioning, keeping the gear seated accurately on the shaft without relying solely on set screws or keyways.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1.5 Mod 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\u003e1.5 (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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e50T, 60T, 65T, 70T, 80T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e8 mm, 10 mm, 12 mm, 15 mm, 16 mm, 17 mm, 20 mm, 25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep Diameter\u003c\/th\u003e\n\u003ctd\u003e50 mm (all variants)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e76.5 mm – 123 mm (3.01\" – 4.84\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs or 2 Pcs (select above)\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\u003eTooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the reduction ratio. For example, pairing a 50T gear with a 25T pinion gives a 2:1 reduction. Higher tooth counts (70T, 80T) produce greater reduction and more torque output at lower speed; lower counts (50T, 60T) are better for moderate reduction or speed-matching applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter should I select for my stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore to your motor's output shaft diameter. Common stepper motor shaft sizes: NEMA 17 typically uses 5 mm shafts (not listed — use a 8 mm bore with a sleeve adapter), NEMA 23 commonly uses 6.35 mm or 8 mm shafts, and NEMA 34 commonly uses 12.7 mm or 14 mm shafts. The 8 mm, 10 mm, 12 mm, 15 mm, 16 mm, 17 mm, 20 mm, and 25 mm bore options cover most servo and stepper configurations. If your shaft is metric, select the matching bore directly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my CNC or automation project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel is a widely used engineering material for power transmission gears in light-to-medium duty applications. It offers good tensile strength (typically 600–800 MPa) and responds well to heat treatment if higher surface hardness is needed. For most DIY CNC routers, 3D printer drives, and small conveyor systems operating at moderate speeds and loads, 45# steel provides adequate strength and wear resistance without the cost of alloy steel.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear corrode if used in a humid workshop environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. In humid or wet environments, we recommend applying a light machine oil or grease to the gear teeth and bore after installation. For long-term corrosion protection, consider a zinc-phosphate coating or periodic re-lubrication. If your application requires inherent corrosion resistance, a stainless steel or nylon gear may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I mesh this gear with a plastic or nylon spur gear of the same module?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as the mating gear is also Mod 1.5 with a 20° pressure angle, it will mesh correctly regardless of material. Steel-on-plastic pairings are common in noise-sensitive or low-load applications where the plastic gear acts as a sacrificial wear component. Keep in mind that the steel gear will outlast the plastic gear significantly, so plan for periodic replacement of the softer gear.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the step hub, and why does it matter for installation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step hub is a raised shoulder on the gear bore face with a diameter of 50 mm. It provides a positive axial stop when the gear is pressed or slid onto a shaft, ensuring consistent positioning without relying solely on set screws. This is especially useful in paired-axis builds where both gears must be positioned at the same axial depth for proper mesh alignment.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eShould I order 1 pc or 2 pcs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder 1 pc if you need a single gear for one axis or to replace a worn gear in an existing drivetrain. Order 2 pcs if you are building a mirrored dual-axis machine (such as a dual-Y-axis CNC gantry), need a spare on hand, or are assembling a gear pair where both gears share the same tooth count and bore. Both quantities ship from the same production batch, ensuring consistent tooth geometry between pieces.\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 tooth count, bore diameter, and quantity 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\": \"Tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the reduction ratio. Higher tooth counts produce greater reduction and more torque output at lower speed; lower counts are better for moderate reduction or speed-matching applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore diameter should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore to your motor's output shaft diameter. The 8 mm, 10 mm, 12 mm, 15 mm, 16 mm, 17 mm, 20 mm, and 25 mm bore options cover most servo and stepper configurations.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my CNC or automation project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel offers good tensile strength (typically 600–800 MPa) and is suitable for light-to-medium duty applications including DIY CNC routers, 3D printer drives, and small conveyor systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear corrode if used in a humid workshop environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. Apply a light machine oil or grease after installation. For long-term protection, consider a zinc-phosphate coating or periodic re-lubrication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I mesh this gear with a plastic or nylon spur gear of the same module?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as the mating gear is also Mod 1.5 with a 20° pressure angle, it will mesh correctly regardless of material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the step hub, and why does it matter for installation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step hub is a raised shoulder with a 50 mm diameter that provides a positive axial stop when the gear is mounted on a shaft, ensuring consistent positioning without relying solely on set screws.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1 pc or 2 pcs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Order 1 pc for a single axis or replacement. Order 2 pcs for mirrored dual-axis machines, gear pairs, or to keep a spare on hand. Both quantities ship from the same production batch.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"50mm \/ 8mm \/ 50mm \u0026 1 Pcs","offer_id":52443093729554,"sku":"GLFBBYWHK-KCSJ2921x1","price":58.55,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 8mm \/ 50mm \u0026 2 Pcs","offer_id":52443093762322,"sku":"GLFBBYWHK-KCSJ2921x2","price":115.16,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 10mm \/ 50mm \u0026 1 Pcs","offer_id":52443093795090,"sku":"GLFBBYWHK-KCSJ2922x1","price":71.9,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 10mm \/ 50mm \u0026 2 Pcs","offer_id":52443093827858,"sku":"GLFBBYWHK-KCSJ2922x2","price":141.89,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 12mm \/ 50mm \u0026 1 Pcs","offer_id":52443093860626,"sku":"GLFBBYWHK-KCSJ2923x1","price":71.9,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 12mm \/ 50mm \u0026 2 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