{"product_id":"1-5-mod-45-teeth-spur-gears-transmission-gear-with-step-45-steel-blackening","title":"1.5 Mod 45 Teeth Spur Gears Transmission Gear With Step 45# Steel Blackening","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Mod 45-Tooth Spur Gear with Step — Reliable Power Transmission for DIY Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands a gear that fits precisely and holds up under load, a loose tolerance or soft-metal substitute wastes hours of rework. Makers, hobbyists, and small-workshop engineers who need a dependable 1.5 module spur gear with a stepped bore will find this 45-tooth option engineered to drop straight into standard drive trains without play or wobble.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel and finished with a blackening (bluing) surface treatment that reduces surface friction and provides a baseline level of corrosion resistance. The stepped hub design accommodates both plain round bores (8 mm – 25 mm \/ approx. 0.31 in – 0.98 in) and keyed bores (5×2.3 mm and 6×2.8 mm keyway profiles), covering a wide range of shaft diameters. Tooth thickness is 15 mm (approx. 0.59 in), and the module is 1.5 M with 45 teeth, giving an approximate pitch diameter of 67.5 mm (2.66 in).\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC router axis drives, 3D-printer extruder gear trains, small conveyor reduction stages, and educational robotics platforms where a 1.5 mod 45-tooth spur gear with keyed bore or stepped hub is required for precise shaft-to-gear coupling.\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 gear systems. Mates with any standard 1.5M spur or rack gear. Verify bore size and keyway dimensions against your shaft before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1.5 Mod 45-Tooth Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Steel Construction\u003c\/strong\u003e — Medium-carbon steel provides solid tensile strength and wear resistance for sustained rotational loads in power transmission applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\u003cstrong\u003eBlackening Surface Treatment\u003c\/strong\u003e — The oxidizing finish reduces bare-metal friction, offers light corrosion protection, and gives a clean, uniform appearance without adding dimensional bulk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e — The integrated step allows the gear to seat positively on shafts of varying diameters, reducing axial float and simplifying assembly in tight housings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eWide Bore Selection\u003c\/strong\u003e — Round bores from 8 mm to 25 mm plus keyed options (5×2.3 mm and 6×2.8 mm) mean one product listing covers most standard shaft sizes used in DIY and light-industrial drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, or 3-piece packs so you can order exactly what your project needs — single replacement or a matched set for multi-axis builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eStandard 1.5M Module Pitch\u003c\/strong\u003e — Fully interchangeable with any Module 1.5 rack, pinion, or mating spur gear, making integration into existing drive systems straightforward.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 1.5 Mod Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5 M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e45 T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Thickness\u003c\/th\u003e\n\u003ctd\u003e15 mm (0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApproximate Pitch Diameter\u003c\/th\u003e\n\u003ctd\u003e67.5 mm (2.66 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eRound bore or keyed bore (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRound Bore Range\u003c\/th\u003e\n\u003ctd\u003e8 mm – 25 mm (0.31 in – 0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e5×2.3 mm \/ 6×2.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub\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\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eBlackening (bluing oxidation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Width (Face Width)\u003c\/th\u003e\n\u003ctd\u003e15 mm (0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 2 pcs \/ 3 pcs (see 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 bore size for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper. For a plain round shaft, select the matching round bore (e.g., 10 mm shaft → 10 mm bore). If your shaft has a keyway, match both the shaft diameter and the keyway width\/depth to one of the keyed bore options (5×2.3 mm or 6×2.8 mm). A set screw or interference fit is typically used to secure round-bore gears on the shaft.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the \"stepped hub\" design mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA stepped hub means the gear body has a raised cylindrical boss (step) around the bore. This step provides a longer engagement surface on the shaft, improving concentricity and reducing wobble compared to a flat-hub gear. It also makes it easier to position the gear axially along the shaft and to retain it with a collar or snap ring.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel (equivalent to AISI 1045) is a medium-carbon steel widely used for machine gears, shafts, and structural components. It offers a good balance of tensile strength (typically 600–800 MPa) and machinability. It is well-suited for light-to-medium duty power transmission in DIY CNC, robotics, and conveyor applications. For very high-torque or high-speed industrial drives, consider consulting a mechanical engineer for a hardened-gear specification.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the blackening finish protect against rust?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe blackening (hot or cold oxidation) treatment provides a thin magnetite layer that offers light corrosion resistance and reduces surface friction. It is not a heavy-duty anti-corrosion coating like zinc plating or powder coat. For environments with moisture, oils, or mild chemicals, applying a light machine oil after installation is recommended to extend the finish life.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh correctly with my existing Module 1.5 rack or pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as your existing rack, pinion, or mating gear is also Module 1.5 with the same pressure angle (typically 20°), this gear will mesh correctly. Module is the primary compatibility parameter for spur gears. Confirm the pressure angle of your existing components before ordering if you are unsure.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a vertical load-bearing orientation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear is designed for rotational power transmission in standard drive-train configurations. It can be used in vertical orientations (e.g., Z-axis drives on CNC routers) provided the shaft is properly supported by bearings and the load does not exceed the gear's rated capacity. Ensure adequate lubrication and that the bore-to-shaft fit is secure to prevent axial slippage under gravity loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the keyed bore variants and the round bore variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eRound bore variants have a smooth cylindrical hole and are typically secured to the shaft with a set screw or press fit. Keyed bore variants have a slot (keyway) machined into the bore that accepts a matching key on the shaft, providing a positive mechanical lock that prevents rotational slipping under torque — ideal for higher-torque or reversing-load applications.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your bore size and packing 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 bore size for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper. For a plain round shaft, select the matching round bore. If your shaft has a keyway, match both the shaft diameter and the keyway width\/depth to one of the keyed bore options (5×2.3 mm or 6×2.8 mm). A set screw or interference fit is typically used to secure round-bore gears on the shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the stepped hub design mean, and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A stepped hub means the gear body has a raised cylindrical boss around the bore. This step provides a longer engagement surface on the shaft, improving concentricity and reducing wobble. It also makes it easier to position the gear axially and retain it with a collar or snap ring.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel (equivalent to AISI 1045) is a medium-carbon steel with tensile strength typically 600–800 MPa. It is well-suited for light-to-medium duty power transmission in DIY CNC, robotics, and conveyor applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the blackening finish protect against rust?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The blackening treatment provides a thin magnetite layer offering light corrosion resistance and reduced surface friction. For moist or chemical environments, applying a light machine oil after installation is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh correctly with my existing Module 1.5 rack or pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as your existing rack, pinion, or mating gear is also Module 1.5 with the same pressure angle (typically 20°), this gear will mesh correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a vertical load-bearing orientation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the shaft is properly supported by bearings and the load does not exceed the gear's rated capacity. Ensure adequate lubrication and a secure bore-to-shaft fit to prevent axial slippage under gravity loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the keyed bore variants and the round bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Round bore variants have a smooth cylindrical hole secured with a set screw or press fit. Keyed bore variants have a keyway slot that accepts a matching key on the shaft, providing a positive mechanical lock that prevents rotational slipping under torque.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M 45T, Tooth Thickness 15mm \/ 8mm \/ 1 pcs","offer_id":52443221983506,"sku":"GLFBFHHGLBZSJ057978x1","price":82.09,"currency_code":"USD","in_stock":true},{"title":"1.5M 45T, Tooth Thickness 15mm \/ 10mm \/ 1 pcs","offer_id":52443222016274,"sku":"GLFBFHHGLBZSJ057979x1","price":82.09,"currency_code":"USD","in_stock":true},{"title":"1.5M 45T, Tooth Thickness 15mm \/ 12mm \/ 1 pcs","offer_id":52443222049042,"sku":"GLFBFHHGLBZSJ057980x1","price":82.09,"currency_code":"USD","in_stock":true},{"title":"1.5M 45T, Tooth Thickness 15mm \/ 15mm \/ 1 pcs","offer_id":52443222081810,"sku":"GLFBFHHGLBZSJ057981x1","price":82.09,"currency_code":"USD","in_stock":true},{"title":"1.5M 45T, Tooth Thickness 15mm \/ 16mm \/ 1 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