{"product_id":"1-mod-spur-gear-45-steel-transmission-gear-teeth-40t-55t-with-step-motor-gear","title":"1 Mod Spur Gear 45# Steel Transmission Gear Teeth 40T~55T With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Mod Spur Gear in 45# Steel — Precision Transmission for Motor \u0026amp; DIY Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your stepper motor project stalls because of a sloppy, undersized gear, the entire build suffers. Engineers, makers, and hobbyists who need reliable, repeatable torque transfer in CNC routers, 3D printer extruders, robotic arms, and custom drive trains rely on a gear that holds tight tolerances and resists wear over thousands of cycles. These 1 Mod spur gears are machined for exactly that audience.\u003c\/p\u003e\n\u003cp\u003eEach gear is cut from 45# medium-carbon steel, offering a balance of machinability and surface hardness suited to moderate-to-high load applications. The module is 1 (metric), with tooth counts ranging from 40T to 55T and bore diameters from 6 mm (0.24 in) to 20 mm (0.79 in). The stepped hub design — available in 25 mm, 30 mm, 35 mm, and 40 mm step diameters — provides a positive axial register against a shaft shoulder or housing face, simplifying alignment during assembly. Overall gear thickness is typically 10–12 mm depending on tooth count.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper motor output stages in desktop CNC machines, gear-reduction stages in conveyor and indexing fixtures, and replacement transmission gears in light-duty automation equipment. Long-tail search terms that describe this product well: \"module 1 steel spur gear for NEMA 17\", \"40 tooth metric spur gear 8mm bore\", and \"bulk spur gear set for robotics\".\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 Module 1 (metric) tooth profile. Meshes with any other Module 1 spur or rack gear. Verify bore diameter and step diameter match your shaft and housing before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1 Mod Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# steel for a reliable combination of tensile strength and machinability, suitable for moderate-load transmission applications in motors and automation equipment.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eModule 1 Metric Tooth Profile\u003c\/strong\u003e\u003cbr\u003eStandard Module 1 pitch ensures direct mesh compatibility with any other M1 spur gear, rack, or pinion — no custom tooling or adapters required.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Bore Range: 6 mm – 20 mm\u003c\/strong\u003e\u003cbr\u003eAvailable bore diameters cover 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 12.7 mm, 14 mm, 15 mm, 16 mm, 17 mm, 19 mm, and 20 mm — matching common stepper, servo, and DC motor shaft sizes.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🪜\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eStepped Hub for Positive Axial Location\u003c\/strong\u003e\u003cbr\u003eThe integrated step hub (25–40 mm step diameter options) registers against a shaft shoulder or housing face, reducing axial float and simplifying assembly alignment.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eTooth Count Options: 40T, 44T, 45T, 48T, 50T, 55T\u003c\/strong\u003e\u003cbr\u003eSix tooth-count options let you dial in the gear ratio you need for your drive stage without custom ordering — from compact 40T pinions to larger 55T reduction gears.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eFlexible Pack Quantities: 1, 3, 5, or 10 Pieces\u003c\/strong\u003e\u003cbr\u003eOrder a single gear for prototyping or a 10-piece set for production runs and spares inventory — all at consistent per-unit quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 1 Mod Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1 (Metric)\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\u003e40T, 44T, 45T, 48T, 50T, 55T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17, 19, 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep Diameter Options\u003c\/th\u003e\n\u003ctd\u003e25, 30, 35, 40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Face Width\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1, 3, 5, or 10 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway \/ Set Screw\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003eThe gear ratio between two meshing gears equals the ratio of their tooth counts. For example, pairing a 40T gear with a 20T pinion gives a 2:1 reduction. Choose a higher tooth count (e.g., 50T or 55T) on the output side when you need to reduce speed and increase torque, and a lower count on the motor side. Always confirm that both gears share the same module (M1 in this case) to ensure proper mesh.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I select for my stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bore diameter to your motor shaft diameter. Common stepper motor shaft sizes are 5 mm (NEMA 17 standard), 6.35 mm (1\/4 inch), 8 mm (NEMA 23), and 10 mm (larger NEMA 23\/34 frames). If your shaft is 5 mm, you may need to bore out a 6 mm gear slightly — or use a set screw and shaft adapter. Contact us if you need confirmation on a specific shaft size.\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# steel has a typical tensile strength of approximately 600–700 MPa and yield strength around 355 MPa, making it suitable for moderate-load transmission in CNC, robotics, and light automation. For very high-torque or high-speed applications (above ~3,000 RPM continuous), consider heat-treated or alloy steel alternatives. These gears are designed for general-purpose DIY and maker use cases.\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, dry environments this is generally not an issue. If your application involves moisture, humidity, or outdoor exposure, we recommend applying a light machine oil or grease coating after installation, or considering a stainless steel or zinc-plated alternative for your environment.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the \"step diameter\" option mean, and which should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step diameter refers to the outer diameter of the hub shoulder that protrudes from the gear face. This stepped hub registers against a housing bore or shaft collar to provide axial location — preventing the gear from sliding along the shaft during operation. Choose a step diameter that matches your housing bore or that is slightly smaller than your mounting pocket. Common pairings: 25–30 mm steps for compact motor mounts, 35–40 mm steps for larger housings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I order these gears in bulk for production or repair stock?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each variant is available in packs of 1, 3, 5, or 10 pieces. The 10-piece option offers the best per-unit value and is well-suited for production runs, maintenance kits, or classroom\/lab inventory. All pieces in a pack are identical in tooth count, bore diameter, and step diameter as selected.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with a Module 1 rack or worm gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears will mesh correctly with any Module 1 spur gear or Module 1 rack. They are not designed to mesh with worm gears, bevel gears, or helical gears, which have different tooth geometries. Always verify that the mating component is also Module 1 before ordering.\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 pack 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\": \"The gear ratio between two meshing gears equals the ratio of their tooth counts. Choose a higher tooth count on the output side when you need to reduce speed and increase torque. Always confirm both gears share Module 1 for proper mesh.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What bore diameter should I select for my stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore diameter to your motor shaft. Common sizes: 5mm (NEMA 17), 6.35mm (1\/4 inch), 8mm (NEMA 23), 10mm (larger NEMA 23\/34). Contact us if you need confirmation on a specific shaft size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has tensile strength of approximately 600–700 MPa, suitable for moderate-load transmission in CNC, robotics, and light automation. For very high-torque or high-speed applications above ~3,000 RPM, consider heat-treated alternatives.\"\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. For moisture or outdoor exposure, apply a light machine oil or grease coating after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the step diameter option mean, and which should I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step diameter is the outer diameter of the hub shoulder that provides axial location. Choose a step diameter matching your housing bore. Common pairings: 25–30mm for compact motor mounts, 35–40mm for larger housings.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order these gears in bulk for production or repair stock?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each variant is available in packs of 1, 3, 5, or 10 pieces. The 10-piece option offers the best per-unit value for production runs, maintenance kits, or lab inventory.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with a Module 1 rack or worm gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears mesh correctly with any Module 1 spur gear or Module 1 rack. They are not designed to mesh with worm, bevel, or helical gears. Always verify the mating component is also Module 1.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"40T \/ 6mm \/ 25mm \u0026 1 Pcs","offer_id":52442229080338,"sku":"GLFBBYWHK-KCSJ2761x1","price":19.8,"currency_code":"USD","in_stock":true},{"title":"40T \/ 6mm \/ 25mm \u0026 3 Pcs","offer_id":52442229113106,"sku":"GLFBBYWHK-KCSJ2761x3","price":55.57,"currency_code":"USD","in_stock":true},{"title":"40T \/ 6mm \/ 25mm \u0026 5 Pcs","offer_id":52442229145874,"sku":"GLFBBYWHK-KCSJ2761x5","price":91.26,"currency_code":"USD","in_stock":true},{"title":"40T \/ 6mm \/ 25mm \u0026 10 Pcs","offer_id":52442229178642,"sku":"GLFBBYWHK-KCSJ2761x10","price":180.55,"currency_code":"USD","in_stock":true},{"title":"40T \/ 6.35mm \/ 30mm \u0026 1 Pcs","offer_id":52442229211410,"sku":"GLFBBYWHK-KCSJ2762x1","price":19.8,"currency_code":"USD","in_stock":true},{"title":"40T \/ 6.35mm \/ 30mm \u0026 3 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