{"product_id":"1-mod-spur-gear-with-step-60t-90t-pinion-transmission-gear","title":"Spur Gears Pinion Gear 1 Mod Transmission Gear With Step 60T-90T Teeth 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1 Mod Stepped Spur Gear — Precision Pinion Transmission Gear for DIY Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands a reliable gear that fits a stepped shaft without slipping, finding the right 1 Mod spur gear with an integrated step can be frustrating. This product is designed for makers, CNC builders, robotics enthusiasts, and small-machine engineers who need a drop-in pinion gear that handles real torque without play.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness. The stepped hub design accommodates a range of bore diameters from 6 mm (0.24 in) to 25 mm (0.98 in), with step diameters of 30 mm or 40 mm (1.18–1.57 in). Tooth counts span 60T to 90T, covering a wide gear-ratio range in a single product family.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC router axis drives, 3D-printer extruder gear trains, small conveyor reduction stages, and tabletop robotics joint actuators — anywhere a compact 1 Mod pinion gear with a stepped bore is needed for a clean, backlash-minimized mesh.\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 \u003cstrong\u003eModule 1 (1 Mod)\u003c\/strong\u003e rack-and-pinion and gear-pair systems. Verify bore diameter and step diameter against your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1 Mod Stepped 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 body delivers reliable hardness and impact resistance for sustained gear-mesh loads in mechanical drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e — Integrated step (30 mm or 40 mm diameter) provides a positive axial shoulder for precise shaft positioning without additional spacers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e — Available in 60T, 65T, 70T, 80T, and 90T to cover common gear-ratio requirements in a single product family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e — Bore diameters from 6 mm to 25 mm (0.24–0.98 in) accommodate a broad range of motor and shaft sizes without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order 1, 2, 3, or 5 pieces per variant to match your project needs and reduce per-unit cost on multi-axis builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eStandard Module 1 Profile\u003c\/strong\u003e — Full compatibility with Module 1 racks, pinions, and mating gears ensures interchangeability across standard mechanical assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 1 Mod Stepped Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e60T \/ 65T \/ 70T \/ 80T \/ 90T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 \/ 8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16 \/ 17 \/ 19 \/ 20 \/ 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep Diameter\u003c\/th\u003e\n\u003ctd\u003e30 mm or 40 mm (see variant options)\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\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 (straight tooth)\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\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\u003e1 \/ 2 \/ 3 \/ 5 Pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\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\u003eSelect the tooth count based on your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 60T gear with a 20T pinion gives a 3:1 reduction. Higher tooth counts (80T, 90T) produce larger pitch diameters and are suited to slower, higher-torque stages.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft's outer diameter with a caliper. Choose the bore that matches your shaft exactly — a bore that is too large will cause runout and backlash. If you need a keyway or set-screw fit, confirm the hub wall thickness is sufficient for your torque load before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the step diameter used for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe stepped hub provides a machined shoulder that acts as an axial stop when the gear is pressed or slid onto a shaft. This eliminates the need for a separate spacer collar and ensures repeatable axial positioning. Choose 30 mm step for compact assemblies and 40 mm step where a larger bearing surface is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my drive?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# medium-carbon steel offers a tensile strength typically in the 600–800 MPa range and is widely used for moderate-load mechanical gears. It is suitable for CNC routers, 3D printer drives, light conveyor systems, and tabletop robotics. For very high-speed or heavy industrial loads, consider whether a hardened or alloy-steel gear is more appropriate for your specific torque and duty cycle.\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# steel has moderate corrosion resistance. For indoor or dry environments these gears perform well without additional treatment. If used in humid, outdoor, or lightly wet conditions, applying a light machine oil or grease to the gear teeth and bore will significantly extend service life. For highly corrosive environments, a stainless-steel or coated gear would be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these mesh correctly with my existing Module 1 gears or rack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these gears follow the standard Module 1 (Mod 1) tooth profile with a 20° pressure angle, which is the most common metric gear standard. They will mesh correctly with any other Mod 1 spur gear or rack of the same module and pressure angle, regardless of brand, as long as the face widths are compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order just one piece to test fit before buying in bulk?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Most variants are available in a 1-piece quantity option, allowing you to verify fit, bore clearance, and mesh quality before committing to a larger order. Multi-piece packs (2, 3, or 5 pcs) are available at a lower per-unit cost for multi-axis or production builds.\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 packing quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"60T \/ 6mm \/ 40mm \u0026 1 Pcs","offer_id":52443317567762,"sku":"GLFBBYWHK-KCSJ2799x1","price":20.47,"currency_code":"USD","in_stock":true},{"title":"60T \/ 6mm \/ 40mm \u0026 3 Pcs","offer_id":52443317600530,"sku":"GLFBBYWHK-KCSJ2799x3","price":58.82,"currency_code":"USD","in_stock":true},{"title":"60T \/ 6mm \/ 40mm \u0026 5 Pcs","offer_id":52443317633298,"sku":"GLFBBYWHK-KCSJ2799x5","price":97.14,"currency_code":"USD","in_stock":true},{"title":"60T \/ 8mm \/ 40mm \u0026 1 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