{"product_id":"1-5mod-45-steel-spur-gear-35-teeth-bore-6-25mm-pinion-gear-step-motor","title":"1.5Mod 45# Steel Spur Gear 35 Teeth Bore 6-25mm Pinion Gear With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Mod 45# Steel Spur Gear 35T — Precision Pinion Gear for Stepper \u0026amp; Servo Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or undersized gear throws off your entire motion system, the downstream damage — missed steps, stripped teeth, misaligned shafts — costs far more than the part itself. Whether you're a robotics builder, CNC hobbyist, or automation engineer, you need a spur gear that holds tolerance under load and fits your shaft without shimming or adapters.\u003c\/p\u003e\n\u003cp\u003eThis 1.5 Mod spur gear is machined from 45# medium-carbon steel, offering a reliable balance of hardness and machinability. It features 35 teeth (35T) with a tooth width of 12 mm or 15 mm depending on variant (approximately 0.47–0.59 in), and bore diameters ranging from 6 mm to 25 mm (approximately 0.24–0.98 in). Step bore variants include a precision-machined keyway step for positive shaft engagement. Outer diameter is approximately 55.5 mm (≈2.19 in) based on standard 1.5 Mod 35T geometry.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include stepper motor pinion drives in 3D printers and CNC routers, servo gear trains in robotic arms and RC platforms, and reduction stage gearing in conveyor and actuator assemblies — anywhere a compact 1.5 module spur gear with a reliable bore fit is required.\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 Designed for 1.5 Module gear systems. Mates with any 1.5 Mod rack, pinion, or mating gear. Bore options cover NEMA 17, NEMA 23, and common servo motor shaft diameters (6 mm – 25 mm). Step bore variants suit motors with keyway shafts.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 1.5 Mod 35T Steel 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# carbon steel for a strong combination of wear resistance and toughness — holds up under continuous cyclic loading without brittle fracture.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003e1.5 Module, 35-Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStandard 1.5 Mod tooth geometry ensures accurate meshing with any compatible 1.5 Mod rack or mating gear, minimizing backlash in precision drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n\u003cstrong\u003eWide Bore Range: 6 mm – 25 mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in bore sizes from 6 mm to 25 mm to fit a broad range of motor and shaft diameters — select the exact bore that matches your shaft without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\n\u003cstrong\u003eStep Bore Variants with Keyway\u003c\/strong\u003e\n\u003cp\u003eSelect variants include a precision-machined keyway step (e.g., 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) for positive rotational engagement and zero-slip torque transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eTwo Tooth Width Options: 12 mm \u0026amp; 15 mm\u003c\/strong\u003e\n\u003cp\u003eChoose 12 mm tooth width for compact assemblies or 15 mm for higher torque capacity — both share the same 35T 1.5 Mod profile for interchangeability.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eDrop-In Fit for Stepper \u0026amp; Servo Motor Shafts\u003c\/strong\u003e\n\u003cp\u003eBore tolerances are machined to suit standard motor shaft diameters, making this a direct replacement or upgrade pinion gear for NEMA-frame stepper and servo motor applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — 1.5 Mod Spur Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\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\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e35T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e52.5 mm (≈2.07 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e≈55.5 mm (≈2.19 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Width\u003c\/th\u003e\n\u003ctd\u003e12 mm or 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options (step bore variants only)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\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 size for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. Select the bore size that matches — for example, a 6.35 mm (1\/4 in) shaft suits the 6 mm bore with a light press fit, while an 8 mm shaft suits the 8 mm bore. For keyway shafts, choose a step bore variant whose keyway dimensions match your shaft's key.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 12 mm and 15 mm tooth width variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth share the same 1.5 Mod 35T tooth profile and bore range. The 15 mm tooth width provides a larger contact area, which increases torque capacity and load distribution — useful in higher-load or higher-speed applications. The 12 mm variant is more compact and suited to space-constrained assemblies.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the \"Step\" bore mean, and do I need it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA step bore includes a precision-machined keyway slot (e.g., 4×1.8 mm, 5×2.3 mm) that accepts a matching key on the motor shaft. This prevents the gear from rotating independently of the shaft under torque. If your motor shaft has a flat key or keyway, choose a step bore variant. If your shaft is smooth and you plan to use a set screw, choose a standard bore variant.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with my existing 1.5 Mod rack or gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any gear or rack with a 1.5 Module and 20° pressure angle will mesh correctly with this spur gear. Verify both the module and pressure angle of your existing components before ordering. The 35-tooth count determines the gear ratio when paired with a mating pinion.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 45# steel strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel offers a tensile strength typically in the range of 600–800 MPa, making it suitable for moderate-to-high load gear applications including CNC drives, robotic joints, and conveyor systems. For extreme shock loads or corrosive environments, consider whether a hardened or stainless variant better suits your needs.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this gear corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has moderate corrosion resistance. For indoor or dry environments it performs well. In humid, wet, or chemically exposed environments, we recommend applying a light machine oil or grease coating, or selecting a stainless steel gear variant if available. Contact us to confirm finish options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat applications is this spur gear commonly used in?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis 1.5 Mod 35T pinion gear is widely used in 3D printer extruder and axis drives, CNC router motor mounts, robotic arm joint actuators, RC vehicle gear trains, and small conveyor or linear actuator reduction stages. Its bore range covers most NEMA 17 and NEMA 23 stepper motor shaft sizes.\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 Modulus and Teeth Thick – Bore size 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 size for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper. Select the bore size that matches — for example, a 6.35 mm (1\/4 in) shaft suits the 6 mm bore with a light press fit, while an 8 mm shaft suits the 8 mm bore. For keyway shafts, choose a step bore variant whose keyway dimensions match your shaft's key.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 12 mm and 15 mm tooth width variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both share the same 1.5 Mod 35T tooth profile and bore range. The 15 mm tooth width provides a larger contact area, which increases torque capacity and load distribution. The 12 mm variant is more compact and suited to space-constrained assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the Step bore mean, and do I need it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A step bore includes a precision-machined keyway slot that accepts a matching key on the motor shaft, preventing the gear from rotating independently under torque. If your motor shaft has a flat key or keyway, choose a step bore variant. If your shaft is smooth and you plan to use a set screw, choose a standard bore variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 1.5 Mod rack or gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any gear or rack with a 1.5 Module and 20° pressure angle will mesh correctly with this spur gear. Verify both the module and pressure angle of your existing components before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 45# steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# medium-carbon steel offers a tensile strength typically in the range of 600–800 MPa, making it suitable for moderate-to-high load gear applications including CNC drives, robotic joints, and conveyor systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has moderate corrosion resistance. For indoor or dry environments it performs well. In humid or chemically exposed environments, apply a light machine oil or grease coating, or select a stainless steel variant if available.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What applications is this spur gear commonly used in?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This 1.5 Mod 35T pinion gear is widely used in 3D printer extruder and axis drives, CNC router motor mounts, robotic arm joint actuators, RC vehicle gear trains, and small conveyor or linear actuator reduction stages.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Mod, 35T \/ 12mm - 6mm (Step 25mm)","offer_id":52442405142802,"sku":"QTLJGLBZSJ057911x1","price":30.33,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 35T \/ 12mm - 8mm (Step 25mm)","offer_id":52442405175570,"sku":"QTLJGLBZSJ057912x1","price":30.33,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 35T \/ 12mm - 10mm (Step 40mm)","offer_id":52442405208338,"sku":"QTLJGLBZSJ057913x1","price":30.33,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 35T \/ 12mm - 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