{"product_id":"spur-gear-45-steel-1-module-23-teeth-pinion-motor-gear","title":"Spur Gear 45# Steel Transmission Gear 1 Module 23 Teeth Pinion Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpur Gear 1 Module 23 Teeth — Reliable 45# Steel Pinion Gear for Precision Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped or undersized gear brings your motor drive, CNC axis, or automation project to a halt, you need a replacement that fits right and holds up under load. This 45# steel spur gear is designed for makers, engineers, and technicians who demand dimensional accuracy and consistent tooth engagement in compact transmission systems.\u003c\/p\u003e\n\u003cp\u003eThis spur gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. It features a 1 Module (Mod 1) tooth profile with 23 teeth, giving an outer diameter of approximately 25 mm (0.98 in) and a face width typically in the 8–12 mm (0.31–0.47 in) range. Bore diameter varies by variant — see variant options for exact bore size.\u003c\/p\u003e\n\u003cp\u003eTypical applications include DC motor pinion drives in robotics and automation, CNC router and 3D printer axis transmission systems, and DIY gearbox builds where a standard Mod 1 spur gear for motor shaft is required. The straight-tooth profile ensures smooth, low-noise meshing with any compatible Mod 1 rack or mating gear.\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 Meshes with any \u003cstrong\u003eModule 1 (Mod 1)\u003c\/strong\u003e spur gear, rack, or pinion. Verify bore diameter matches your motor shaft before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 45# Steel Mod 1 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 dependable combination of tensile strength and wear resistance, suitable for continuous-duty motor pinion applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eModule 1 — 23 Teeth Standard Profile\u003c\/strong\u003e\n\u003cp\u003eConforms to the Mod 1 gear standard, ensuring direct interchangeability with any compatible Mod 1 rack, pinion, or mating spur gear 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\u003ePrecision-Cut Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStraight involute teeth are cut to tight tolerances for consistent pitch-circle engagement, minimising backlash and vibration in high-cycle drive systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eCompact 25 mm Outer Diameter\u003c\/strong\u003e\n\u003cp\u003eThe ~25 mm OD (approx. 0.98 in) makes this gear ideal for space-constrained motor mounts, servo brackets, and compact gearbox enclosures.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eAvailable in Multi-Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder in the pack size that suits your project — from single units for a quick repair to bulk packs for production runs or workshop stock.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n\u003cstrong\u003eVersatile Bore Options\u003c\/strong\u003e\n\u003cp\u003eMultiple bore diameter variants available to match common motor shaft sizes. Select your required bore from the variant options above before adding to cart.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Mod 1 Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (Mod 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e~25 mm (~0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e23 mm (0.91 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eTypically 8–12 mm (0.31–0.47 in)\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\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStraight Involute\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\u003ePacking Quantity\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\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore diameter for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper before ordering. The bore of the gear must match the shaft diameter exactly for a secure fit. If your shaft has a keyway, select a bored-and-keyed variant where available, or plan to machine a keyway after fitting.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing Mod 1 rack or pinion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with a Module 1 (Mod 1) tooth profile and a 20° pressure angle will mesh correctly with this gear. Confirm both the module and pressure angle of your existing components before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is 45# steel for a motor pinion application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel (equivalent to SAE 1045) has a tensile strength of approximately 600–800 MPa in its normalised state, making it well-suited for moderate-load motor pinion drives. For very high-torque or shock-load applications, consider a hardened or alloy-steel variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear resistant to rust and corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has limited inherent corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, look for a stainless steel or zinc-plated variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Module 1 and other gear modules?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe module number defines the ratio of pitch diameter to number of teeth. A Mod 1 gear has a pitch diameter (in mm) equal to its tooth count — so a 23-tooth Mod 1 gear has a 23 mm pitch diameter. Gears of different modules cannot mesh together; always match the module of your replacement gear to the existing drivetrain.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear in a 3D printer or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Mod 1 spur gears are widely used in DIY CNC routers, 3D printer extruder drives, and laser cutter axis systems. Verify the bore matches your stepper or servo motor shaft, and confirm the face width is compatible with your existing gear or rack width.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many gears do I receive per order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePack quantity varies by the variant selected. Choose your required packing quantity (e.g. 20 Pcs) from the options above before adding to cart. Bulk packs offer better per-unit value for workshop stock or production use.\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 \u003cstrong\u003ebore size and packing quantity\u003c\/strong\u003e 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 diameter for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper before ordering. The bore of the gear must match the shaft diameter exactly for a secure fit. If your shaft has a keyway, select a bored-and-keyed variant where available, or plan to machine a keyway after fitting.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 1 rack or pinion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with a Module 1 (Mod 1) tooth profile and a 20° pressure angle will mesh correctly with this gear. Confirm both the module and pressure angle of your existing components before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is 45# steel for a motor pinion application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel (equivalent to SAE 1045) has a tensile strength of approximately 600–800 MPa in its normalised state, making it well-suited for moderate-load motor pinion drives. For very high-torque or shock-load applications, consider a hardened or alloy-steel variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear resistant to rust and corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has limited inherent corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, look for a stainless steel or zinc-plated variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between Module 1 and other gear modules?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The module number defines the ratio of pitch diameter to number of teeth. A Mod 1 gear has a pitch diameter (in mm) equal to its tooth count — so a 23-tooth Mod 1 gear has a 23 mm pitch diameter. Gears of different modules cannot mesh together; always match the module of your replacement gear to the existing drivetrain.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a 3D printer or CNC router?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Mod 1 spur gears are widely used in DIY CNC routers, 3D printer extruder drives, and laser cutter axis systems. Verify the bore matches your stepper or servo motor shaft, and confirm the face width is compatible with your existing gear or rack width.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many gears do I receive per order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pack quantity varies by the variant selected. Choose your required packing quantity (e.g. 20 Pcs) from the options above before adding to cart. Bulk packs offer better per-unit value for workshop stock or production use.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Mod 23 Teeth \/ 20 Pcs","offer_id":52442280034578,"sku":"GLFBBYWJGJXCD0228x20","price":161.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_9dd81313-05c0-44e5-a8af-5380070b3a7a.jpg?v=1783411109","url":"https:\/\/homediyer.com\/products\/spur-gear-45-steel-1-module-23-teeth-pinion-motor-gear","provider":"HomeDIYer","version":"1.0","type":"link"}