{"product_id":"1-5mod-45-steel-spur-gear-40-teeth-bore-6-30mm-pinion-gear","title":"1.5Mod 45# Steel Spur Gear 40 Teeth Bore 6-30mm Pinion Gear With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1.5 Mod 40-Tooth Steel Spur Gear — Precision Pinion for Stepper Motors \u0026amp; CNC Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen a mismatched or undersized spur gear causes backlash, slippage, or premature wear in your motion system, the entire machine suffers. Engineers, robotics builders, and CNC hobbyists who need a reliable 1.5 Mod 40-tooth spur gear with a wide bore selection will find this pinion gear a dependable drop-in solution for stepper motor and servo drive assemblies.\u003c\/p\u003e\n    \u003cp\u003eThis spur gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The gear features a module of 1.5 Mod with 40 teeth, available in two teeth thickness options — 12mm (~0.47 in) and 15mm (~0.59 in) — and bore diameters ranging from 6mm to 30mm (~0.24 in to 1.18 in). Select variants include a keyway bore (e.g., 5×2.3mm, 6×2.8mm, 8×3.3mm) for positive torque transmission without set-screw slippage.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include stepper motor pinion drives in 3D printers and laser cutters, rack-and-pinion linear actuators for CNC router axes, and gear reduction stages in robotics joints and automated conveyor systems — anywhere a compact, accurately cut 1.5 mod spur gear is required for reliable power transmission.\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 to mesh with any 1.5 Module (Mod 1.5) rack, pinion, or mating gear. Verify your shaft diameter and keyway dimensions before ordering. Bore sizes range from 6mm to 30mm; keyway variants available for select bore sizes.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1.5 Mod 40-Tooth Steel Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\u003cbr\u003e\n        Machined from 45# steel for a reliable combination of surface hardness and core toughness, resisting wear under continuous rotational load.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e1.5 Module, 40 Teeth — Accurate Tooth Profile\u003c\/strong\u003e\u003cbr\u003e\n        Precisely cut to 1.5 Mod standard, ensuring smooth meshing with any compatible 1.5 Mod rack or mating gear with minimal noise and backlash.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range: 6mm to 30mm\u003c\/strong\u003e\u003cbr\u003e\n        Covers the most common stepper and servo motor shaft diameters. Plain bore and keyway bore variants available — select the exact fit for your shaft.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\n        \u003cstrong\u003eKeyway Bore Options for Positive Torque Lock\u003c\/strong\u003e\u003cbr\u003e\n        Select variants include machined keyways (5×2.3mm, 6×2.8mm, 8×3.3mm) that eliminate rotational slip under high-torque or reversing-load conditions.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eTwo Teeth Thickness Options: 12mm \u0026amp; 15mm\u003c\/strong\u003e\u003cbr\u003e\n        Choose 12mm (~0.47 in) for compact assemblies or 15mm (~0.59 in) for higher load capacity and greater face width engagement.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🤖\u003c\/span\u003e\n        \u003cstrong\u003eStepper Motor \u0026amp; CNC Drive Ready\u003c\/strong\u003e\u003cbr\u003e\n        Bore sizes and keyway dimensions are selected to match NEMA-standard stepper motor shafts and common servo output shafts used in CNC, robotics, and automation builds.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5 Mod\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e40T\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\u003eTeeth Thickness\u003c\/th\u003e\n\u003ctd\u003e12mm (~0.47 in) or 15mm (~0.59 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6mm – 30mm (~0.24 – 1.18 in) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e5×2.3mm \/ 6×2.8mm \/ 8×3.3mm (select variants) — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e60mm (~2.36 in) [calculated: Module × Teeth = 1.5 × 40]\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Module\u003c\/th\u003e\n\u003ctd\u003e1.5 Mod mating gears and racks\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 stepper motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor shaft diameter with a caliper. Common NEMA 17 stepper shafts are 5mm; NEMA 23 shafts are typically 6.35mm or 8mm; larger servo motors may use 10mm, 12mm, or larger. Select the bore that matches your shaft diameter exactly. If your shaft has a flat or keyway, choose a keyway bore variant for a positive mechanical lock.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the plain bore and keyway bore variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePlain bore variants use a set screw to secure the gear to the shaft — suitable for lighter loads and applications where disassembly is frequent. Keyway bore variants (5×2.3mm, 6×2.8mm, 8×3.3mm) use a machined slot and key to transmit torque directly, preventing rotational slip under high torque or reversing loads. For CNC drives and robotics joints, keyway variants are generally recommended.\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 after standard heat treatment, making it well-suited for moderate-to-high load spur gear applications such as CNC axis drives, 3D printer extruder gears, and light industrial automation. For very high-speed or heavy-shock-load environments, consider whether a hardened or alloy steel gear would be more appropriate for your specific duty cycle.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear resist corrosion in a workshop environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has moderate corrosion resistance. In typical indoor workshop or machine enclosure environments, the gear will perform reliably. For humid, wet, or chemically exposed environments, 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\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat mating gear or rack does this mesh with?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear is cut to 1.5 Module (Mod 1.5) with a standard 20° pressure angle. It will mesh correctly with any other 1.5 Mod spur gear, pinion, or rack with the same module and pressure angle. Do not attempt to mesh with gears of a different module — tooth profiles will not be compatible.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I choose 12mm or 15mm teeth thickness?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eChoose 12mm teeth thickness for compact assemblies where axial space is limited, such as small CNC routers or 3D printer drives. Choose 15mm teeth thickness when you need greater face width engagement for higher torque capacity or when your mating rack or gear is 15mm wide. When in doubt, 15mm provides more contact area and generally handles higher loads.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear with a servo motor instead of a stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The bore range (6–30mm) covers many servo motor output shaft diameters. Verify your servo shaft diameter and whether it has a keyway. Select the matching bore and keyway variant accordingly. The 1.5 Mod tooth profile is independent of the motor type — what matters is matching the module to your mating gear or rack.\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(mm) 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 stepper motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor shaft diameter with a caliper. Common NEMA 17 stepper shafts are 5mm; NEMA 23 shafts are typically 6.35mm or 8mm; larger servo motors may use 10mm, 12mm, or larger. Select the bore that matches your shaft diameter exactly. If your shaft has a flat or keyway, choose a keyway bore variant for a positive mechanical lock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the plain bore and keyway bore variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Plain bore variants use a set screw to secure the gear to the shaft — suitable for lighter loads and applications where disassembly is frequent. Keyway bore variants use a machined slot and key to transmit torque directly, preventing rotational slip under high torque or reversing loads.\"\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 after standard heat treatment, making it well-suited for moderate-to-high load spur gear applications such as CNC axis drives, 3D printer extruder gears, and light industrial automation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear resist corrosion in a workshop environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel has moderate corrosion resistance. In typical indoor workshop or machine enclosure environments, the gear will perform reliably. For humid or wet environments, applying a light machine oil or grease to the gear teeth is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mating gear or rack does this mesh with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear is cut to 1.5 Module (Mod 1.5) with a standard 20° pressure angle. It will mesh correctly with any other 1.5 Mod spur gear, pinion, or rack with the same module and pressure angle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I choose 12mm or 15mm teeth thickness?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose 12mm teeth thickness for compact assemblies where axial space is limited. Choose 15mm teeth thickness when you need greater face width engagement for higher torque capacity. When in doubt, 15mm provides more contact area and generally handles higher loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear with a servo motor instead of a stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The bore range (6–30mm) covers many servo motor output shaft diameters. Verify your servo shaft diameter and whether it has a keyway. Select the matching bore and keyway variant accordingly.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Mod, 40T \/ 12mm - 6mm","offer_id":52442407797010,"sku":"QTLJGLBZSJ057921x1","price":36.58,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 8mm","offer_id":52442407829778,"sku":"QTLJGLBZSJ057922x1","price":36.58,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 10mm","offer_id":52442407862546,"sku":"QTLJGLBZSJ057923x1","price":36.58,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 12mm","offer_id":52442407895314,"sku":"QTLJGLBZSJ057924x1","price":39.03,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 15mm","offer_id":52442407928082,"sku":"QTLJGLBZSJ057925x1","price":39.03,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 16mm","offer_id":52442407960850,"sku":"QTLJGLBZSJ057926x1","price":39.03,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 17mm","offer_id":52442407993618,"sku":"QTLJGLBZSJ057927x1","price":39.03,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 12mm - 20mm","offer_id":52442408026386,"sku":"QTLJGLBZSJ057928x1","price":39.03,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 8mm","offer_id":52442408059154,"sku":"QTLJGFCD05127x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 10mm","offer_id":52442408091922,"sku":"QTLJGFCD05128x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 12mm","offer_id":52442408124690,"sku":"QTLJGFCD05129x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 14mm","offer_id":52442408157458,"sku":"QTLJGFCD05130x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 15mm","offer_id":52442408190226,"sku":"QTLJGFCD05131x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 16mm","offer_id":52442408222994,"sku":"QTLJGFCD05132x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 17mm","offer_id":52442408255762,"sku":"QTLJGFCD05133x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 19mm","offer_id":52442408288530,"sku":"QTLJGFCD05134x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 20mm","offer_id":52442408321298,"sku":"QTLJGFCD05135x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 22mm","offer_id":52442408354066,"sku":"QTLJGFCD05136x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 25mm","offer_id":52442408386834,"sku":"QTLJGFCD05137x1","price":39.14,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 14mm(5x2.3mm)","offer_id":52442408419602,"sku":"QTLJGFCD05138x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 15mm(5x2.3mm)","offer_id":52442408452370,"sku":"QTLJGFCD05139x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 16mm(5x2.3mm)","offer_id":52442408485138,"sku":"QTLJGFCD05140x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 17mm(5x2.3mm)","offer_id":52442408517906,"sku":"QTLJGFCD05141x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 18mm(6x2.8mm)","offer_id":52442408550674,"sku":"QTLJGFCD05142x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 19mm(6x2.8mm)","offer_id":52442408583442,"sku":"QTLJGFCD05143x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 20mm(6x2.8mm)","offer_id":52442408616210,"sku":"QTLJGFCD05144x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 22mm(6x2.8mm)","offer_id":52442408648978,"sku":"QTLJGFCD05145x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 25mm(8x3.3mm)","offer_id":52442408681746,"sku":"QTLJGFCD05146x1","price":44.2,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 40T \/ 15mm - 30mm(8x3.3mm)","offer_id":52442408714514,"sku":"QTLJGFCD05147x1","price":44.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_2b3e15dd-de55-4f58-ac89-bc0b7c092cd3.jpg?v=1783496973","url":"https:\/\/homediyer.com\/products\/1-5mod-45-steel-spur-gear-40-teeth-bore-6-30mm-pinion-gear","provider":"HomeDIYer","version":"1.0","type":"link"}