{"product_id":"0-5-mod-45-steel-spur-gear-20-60t-bore-4-12mm-pinion-gear-with-step-motor-gear","title":"0.5 Mod 45# Steel Spur Gear 20-60T Bore 4-12mm Pinion Gear with Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod 45# Steel Spur Gear — Precision Pinion Gears for Stepper Motors and Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands dimensional accuracy and repeatable torque transfer, undersized or poorly machined gears become the weakest link. Engineers, robotics hobbyists, and CNC builders who rely on stepper motors need spur gears that hold tight tolerances across every tooth — and that is exactly what these 0.5 module 45# steel spur gears are designed to deliver.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to precision drive applications. The module is 0.5 (Module = 0.5 mm per tooth pitch), with tooth counts ranging from 20T to 60T and bore diameters from 4 mm (~0.157 in) to 12 mm (~0.472 in). Outer diameters scale with tooth count: a 20T gear measures approximately 11 mm OD (~0.43 in), while a 60T gear reaches approximately 31 mm OD (~1.22 in). Face width is typically 5–8 mm depending on the model variant.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper motor pinion drives in 3D printers and CNC routers, compact robotic joint actuators requiring low-backlash gear reduction, and educational or prototyping platforms where interchangeable 0.5M gear sets are needed for rapid iteration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with all standard 0.5 module (0.5M) gear systems. Bore sizes 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, and 12 mm available — select your shaft diameter above to confirm fit.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 0.5 Mod 45# Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from 45# steel for reliable hardness, wear resistance, and dimensional stability under cyclic loading in drive train applications.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e0.5 Module Standard — Wide Tooth Range\u003c\/strong\u003e\u003cbr\u003eAvailable in 20T, 22T, 24T, 25T, 28T, 30T, 32T, 35T, 40T, 50T, and 60T configurations, enabling flexible gear ratio selection within a single module family.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Options (4–12 mm)\u003c\/strong\u003e\u003cbr\u003eBore diameters of 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, and 12 mm accommodate a wide range of motor shaft and axle sizes without custom machining.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eStepper Motor Pinion Compatibility\u003c\/strong\u003e\u003cbr\u003eTooth profile and bore sizing are optimized for direct mounting on NEMA 8, NEMA 11, and NEMA 17 stepper motor shafts commonly used in 3D printers, CNC machines, and robotics.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\u003cbr\u003eOrder in packs of 1, 2, 3, or 5 pieces to match your project scale — from single-unit prototyping to small-batch production builds.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eInterchangeable Within 0.5M System\u003c\/strong\u003e\u003cbr\u003eAll variants share the same 0.5 module pitch, ensuring full mesh compatibility across the tooth-count range for multi-stage gear train designs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 0.5 Module Steel Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5M\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 (T)\u003c\/th\u003e\n\u003ctd\u003e20T, 22T, 24T, 25T, 28T, 30T, 32T, 35T, 40T, 50T, 60T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 7 mm \/ 8 mm \/ 10 mm \/ 12 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (scales with tooth count; approx. 11–31 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options (typically 5–8 mm)\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\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Pinion)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 pcs (select above)\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\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect your tooth count based on the gear ratio you need. Divide the driven gear tooth count by the driving gear tooth count to get the reduction ratio. For example, pairing a 20T pinion with a 60T gear gives a 3:1 reduction. All variants in this listing share the same 0.5M module, so any two gears from this range will mesh correctly with each other.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich bore size fits a NEMA 17 stepper motor shaft?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard NEMA 17 stepper motors typically have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. If your motor has a D-cut shaft, you may need to add a set screw or use a shaft coupler for a secure connection. NEMA 11 motors commonly use a 5 mm shaft as well, while NEMA 8 motors often use a 4 mm shaft.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel provides a tensile strength of approximately 600–700 MPa in the normalized condition, making it suitable for moderate-load drive applications such as 3D printer extruder drives, CNC axis drives, and light robotic joints. For very high-torque or high-speed applications, consider whether a heat-treated or hardened gear grade is more appropriate for your load cycle.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has limited inherent corrosion resistance compared to stainless steel. For indoor, dry environments these gears perform well without additional treatment. If your application involves moisture, humidity, or outdoor exposure, applying a light machine oil or grease to the gear teeth is recommended to prevent surface oxidation and extend service life.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill these gears mesh with other 0.5M gears I already have?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. All gears with the same module (0.5M) and the same pressure angle (20°) will mesh correctly regardless of tooth count, as long as the center distance is set appropriately. The center distance between two meshing gears equals half the sum of their pitch diameters: C = (D1 + D2) \/ 2, where D = Module x Tooth Count.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow does outer diameter change across tooth count models?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a 0.5M gear, the pitch diameter equals 0.5 x tooth count (in mm), and the outer diameter is approximately (0.5 x T) + 1 mm. Examples: 20T gives ~11 mm OD, 30T gives ~16 mm OD, 40T gives ~21 mm OD, 50T gives ~26 mm OD, 60T gives ~31 mm OD. Refer to the variant selector for confirmed dimensions.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I order a mix of tooth counts and bore sizes in one order?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach variant in this listing represents a specific combination of tooth count, bore diameter, and pack quantity. To order multiple combinations, add each desired variant to your cart separately. The pack quantity options (1, 2, 3, or 5 pcs) let you right-size each line item for your build.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model (tooth count), Bore diameter, and Pack Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"0.5M 20T \/ 4mm \/ 1","offer_id":52441858179346,"sku":"GLFBQLPJGJXCD4511x1","price":4.34,"currency_code":"USD","in_stock":true},{"title":"0.5M 20T \/ 4mm \/ 2","offer_id":52441858212114,"sku":"GLFBQLPJGJXCD4511x2","price":7.14,"currency_code":"USD","in_stock":true},{"title":"0.5M 20T \/ 4mm \/ 3","offer_id":52441858244882,"sku":"GLFBQLPJGJXCD4511x3","price":9.91,"currency_code":"USD","in_stock":true},{"title":"0.5M 20T \/ 4mm \/ 5","offer_id":52441858277650,"sku":"GLFBQLPJGJXCD4511x5","price":15.63,"currency_code":"USD","in_stock":true},{"title":"0.5M 20T \/ 5mm \/ 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