{"product_id":"spur-gears-1-5mod-transmission-gear-with-step-45-steel-pinion-motor-gear-20t-30t","title":"Spur Gears 1.5Mod Transmission Gear With Step 45#Steel Pinion Motor Gear 20T~30T","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Module Spur Gears in 45# Steel — Stepped Bore Pinion Gears for Reliable Torque Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a loose-fitting gear causes backlash, vibration, or premature wear in your drive train, the root cause is almost always a mismatch between bore tolerance and shaft diameter. Makers, CNC builders, and small-machine engineers who need a drop-in stepped-bore pinion gear that locks onto the shaft without custom machining will find these 1.5 module spur gears a practical solution.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balance of hardness and machinability suited to moderate-load power transmission. The stepped bore design provides a positive axial shoulder for shaft positioning. Tooth counts range from 20T to 30T, bore diameters from 6 mm (0.236 in) to 15 mm (0.591 in), and step outer diameters of 25 mm (0.984 in), 30 mm (1.181 in), or 35 mm (1.378 in), covering a wide range of shaft and housing combinations.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC router Z-axis drives, small conveyor reduction stages, 3D printer extruder gear trains, and tabletop robotic arm joints — anywhere a compact 1.5 mod stepped pinion gear for motor shaft is needed to transmit torque cleanly at low-to-medium speeds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for 1.5 module gear systems. Mates with any standard 1.5 mod spur or helical rack. Verify bore diameter and step diameter against your shaft and housing before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1.5 Module Stepped Bore 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# Medium-Carbon Steel Construction\u003c\/strong\u003e — Machined from 45# steel for a solid combination of tensile strength and wear resistance under cyclic loading in power-transmission applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStepped Bore for Positive Shaft Seating\u003c\/strong\u003e — The integrated step shoulder provides a precise axial reference face, reducing the need for additional collars or spacers when mounting on a motor shaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003e1.5 Module Tooth Profile\u003c\/strong\u003e — Standard 1.5 mod involute tooth geometry ensures smooth meshing with any compatible 1.5 mod mating gear, rack, or pinion in your drivetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Variant Range\u003c\/strong\u003e — Available in 20T, 24T, 25T, and 30T tooth counts with bore diameters from 6 mm to 15 mm and step diameters of 25 mm, 30 mm, or 35 mm to suit diverse shaft and housing configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eMulti-Pack Options\u003c\/strong\u003e — Choose 1, 3, or 5 pieces per order to stock spares for maintenance or build multiple identical axes in a single purchase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eMachinable for Custom Keyways\u003c\/strong\u003e — 45# steel responds well to secondary machining, allowing you to cut a keyway or set-screw flat if your application requires a keyed shaft connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 1.5 Module Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5\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 \/ 24T \/ 25T \/ 30T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 6.35 mm \/ 7 mm \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep Outer Diameter\u003c\/th\u003e\n\u003ctd\u003e25 mm \/ 30 mm \/ 35 mm (see 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\u003eStandard Involute\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\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 3 Pcs \/ 5 Pcs (see 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\n\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\n\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTooth count determines the gear ratio when paired with a mating gear. A 20T pinion meshing with a 40T gear gives a 2:1 reduction. For higher torque output choose a lower tooth count (20T or 24T); for higher speed with less torque reduction choose 25T or 30T. Always match the module (1.5) of both gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the bore diameter that matches your motor or drive shaft diameter. Common motor shaft sizes are 6 mm, 6.35 mm (1\/4 in), 8 mm, and 10 mm. If your shaft is slightly undersized, a set-screw or keyway can compensate; if oversized, the gear will not fit without re-boring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the step diameter dimension refer to?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe step diameter (25 mm, 30 mm, or 35 mm) is the outer diameter of the shoulder section machined into the gear hub. This shoulder seats against a housing bore or bearing face to provide axial location. Choose the step diameter that matches your housing or bearing inner race diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel has a typical tensile strength of approximately 600–800 MPa after normalizing. For light-to-medium duty applications such as CNC routers, 3D printers, and small robotic joints, these gears provide adequate strength. For heavy industrial loads or continuous high-torque operation, consider hardened or alloy-steel alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel has limited inherent corrosion resistance. For indoor or dry environments this is generally acceptable. If your application involves moisture, coolant, or outdoor exposure, apply a light machine oil coating or consider a zinc-plated or stainless-steel alternative gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears with a rack and pinion system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These 1.5 module spur gears will mesh correctly with any standard 1.5 mod gear rack. This makes them suitable for linear motion systems such as CNC gantry axes, camera sliders, and automated drawer mechanisms. Ensure the rack module is also 1.5 and the pressure angle is 20°.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy should I order a multi-pack instead of a single piece?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMulti-packs (3 Pcs or 5 Pcs) are cost-effective when building machines with multiple identical axes, stocking maintenance spares, or prototyping gear ratio options. The per-unit cost decreases with larger packs, and having spares on hand minimises downtime if a gear needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count, bore diameter, and step diameter \u0026amp; packing quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20T \/ 6mm \/ 25mm \u0026 1 Pcs","offer_id":52443328839954,"sku":"GLFBBYWHK-KCSJ2867x1","price":10.73,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6mm \/ 25mm \u0026 3 Pcs","offer_id":52443328872722,"sku":"GLFBBYWHK-KCSJ2867x3","price":29.59,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6mm \/ 25mm \u0026 5 Pcs","offer_id":52443328905490,"sku":"GLFBBYWHK-KCSJ2867x5","price":48.46,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6.35mm \/ 25mm \u0026 1 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