{"product_id":"1-5mod-45-steel-spur-gear-65-teeth-bore-8-25mm-pinion-gear-with-step-motor-gear","title":"1.5Mod 45# Steel Spur Gear 65 Teeth Bore 8-25mm Pinion Gear With Step Motor Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1.5 Mod 65-Tooth Steel Spur Gear — Reliable Power Transmission for DIY and Mechanical Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear brings your CNC router, 3D printer, or custom drive system to a halt, finding a replacement with the exact bore and tooth count is frustrating. This 1.5 Module 65-tooth spur gear is designed for makers, engineers, and hobbyists who need a dimensionally accurate, drop-in mechanical component without custom machining.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and machinability. The module is 1.5 (Mod 1.5), tooth count is 65T, and the stepped bore ranges from 8 mm (0.31 in) to 25 mm (0.98 in) depending on the variant selected. Teeth thickness options span 12 mm (0.47 in) and 15 mm (0.59 in), with step hub depths of 30 mm, 40 mm, or 50 mm to accommodate different shaft and motor configurations.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include NEMA stepper motor pinion assemblies for DIY CNC machines, rack-and-pinion linear actuators in automation rigs, and gear-reduction drive trains in robotics and custom mechanical projects requiring a 1.5 mod gear ratio stage.\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    Compatible with 1.5 Module gear racks, pinions, and mating spur gears. Bore sizes fit common NEMA 17, NEMA 23, and NEMA 34 motor shaft diameters — confirm your shaft OD before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1.5 Mod 65T Steel Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Machined from 45# steel for a reliable combination of surface hardness and core toughness, suitable for moderate-to-high load drive applications.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eMod 1.5 \/ 65-Tooth Specification\u003c\/strong\u003e — Standard 1.5 module pitch ensures direct mesh compatibility with Mod 1.5 gear racks, pinions, and mating gears without custom adaptation.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eStepped Bore Design\u003c\/strong\u003e — Integrated step hub allows the gear to seat positively against a shoulder or motor face, reducing axial float and simplifying alignment during assembly.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Bore and Thickness Variants\u003c\/strong\u003e — Bore options from 8 mm to 25 mm and teeth thickness of 12 mm or 15 mm let you match the gear precisely to your shaft diameter and load width requirements.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eConsistent Tooth Profile Accuracy\u003c\/strong\u003e — Gear teeth are cut to standard involute profile geometry, ensuring smooth meshing, reduced backlash, and even load distribution across the tooth face.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eReady for Keyway or Set-Screw Modification\u003c\/strong\u003e — The bore is finished to allow straightforward post-machining for keyways or radial set-screw holes if your application requires positive shaft locking.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — 1.5 Mod Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\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\u003e65T\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\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e97.5 mm (3.84 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOutside Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e100.5 mm (3.96 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTeeth Thickness\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\u003e8 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStep Hub Depth\u003c\/th\u003e\n\u003ctd\u003e30 mm, 40 mm, or 50 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural machined steel (uncoated)\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\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 or drive shaft outer diameter (OD) with calipers. Select the bore variant that matches your shaft OD exactly — for example, if your NEMA 23 motor shaft is 8 mm, choose the 8 mm bore option. If you plan to add a keyway or set screw, choose the bore that matches the shaft before modification.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does the \"Step\" dimension mean in the variant name?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe Step dimension (e.g., Step 40mm) refers to the total hub depth — the length of the cylindrical boss that extends behind the gear face. A longer step hub provides more shaft engagement and is useful when you need the gear to sit further from a motor face or bearing plate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this gear compatible with a 1.5 Mod gear rack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This gear is machined to standard Mod 1.5 involute tooth geometry with a 20° pressure angle, which is the standard for Mod 1.5 gear racks and mating pinions. Always verify that your rack is also Mod 1.5 before assembling.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load can this gear handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel spur gears of this size are suited for moderate-to-high torque applications typical of CNC drives, robotics, and automation equipment. Exact load capacity depends on operating speed, lubrication, and duty cycle. For continuous heavy-duty industrial use, consult a mechanical engineer to verify the gear's rated torque for your specific application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear rust or corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For indoor or dry environments, the natural machined finish is adequate with periodic light oiling. For humid or outdoor environments, apply a rust-inhibiting grease or consider a zinc-phosphate coating after purchase to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear with a NEMA 17 stepper motor?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNEMA 17 motors typically have a 5 mm shaft. This gear's smallest bore option is 8 mm, so it will not directly fit a standard NEMA 17 shaft without a sleeve adapter. It is better suited for NEMA 23 (6.35 mm or 8 mm shaft) and NEMA 34 (12.7 mm shaft) motors, or custom shafts in the 8–25 mm range.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to add a keyway or set screw myself?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe bore is supplied as a plain finished bore. If your application requires a keyway or radial set screw for positive shaft locking, you will need to machine or drill these features yourself or have them done by a local machine shop. The 45# steel machines cleanly with standard HSS or carbide tooling.\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 or drive shaft outer diameter (OD) with calipers. Select the bore variant that matches your shaft OD exactly. If you plan to add a keyway or set screw, choose the bore that matches the shaft before modification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the Step dimension mean in the variant name?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Step dimension refers to the total hub depth — the length of the cylindrical boss that extends behind the gear face. A longer step hub provides more shaft engagement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear compatible with a 1.5 Mod gear rack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This gear is machined to standard Mod 1.5 involute tooth geometry with a 20° pressure angle, compatible with Mod 1.5 gear racks and mating pinions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load can this gear handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel spur gears of this size are suited for moderate-to-high torque applications typical of CNC drives, robotics, and automation equipment. Exact load capacity depends on operating speed, lubrication, and duty cycle.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently corrosion-resistant. For indoor or dry environments, periodic light oiling is adequate. For humid environments, apply a rust-inhibiting grease or zinc-phosphate coating.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear with a NEMA 17 stepper motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NEMA 17 motors typically have a 5 mm shaft. This gear's smallest bore is 8 mm, so it will not directly fit without a sleeve adapter. It is better suited for NEMA 23 and NEMA 34 motors, or custom shafts in the 8–25 mm range.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need to add a keyway or set screw myself?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The bore is supplied as a plain finished bore. Keyways or set screws must be machined separately. The 45# steel machines cleanly with standard HSS or carbide tooling.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Mod, 65T \/ 12mm, 8mm (Step 40mm)","offer_id":52442413760786,"sku":"QTLJGFCD05186x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 10mm (Step 30mm)","offer_id":52442413793554,"sku":"QTLJGFCD05187x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 10mm (Step 40mm)","offer_id":52442413826322,"sku":"QTLJGFCD05188x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 12mm (Step 30mm)","offer_id":52442413859090,"sku":"QTLJGFCD05189x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 12mm (Step 40mm)","offer_id":52442413891858,"sku":"QTLJGFCD05190x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 14mm (Step 40mm)","offer_id":52442413924626,"sku":"QTLJGFCD05191x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 15mm (Step 40mm)","offer_id":52442413957394,"sku":"QTLJGFCD05192x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 19mm (Step 40mm)","offer_id":52442413990162,"sku":"QTLJGFCD05193x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 12mm, 20mm (Step 40mm)","offer_id":52442414022930,"sku":"QTLJGFCD05194x1","price":87.83,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 10mm (Step 50mm)","offer_id":52442414055698,"sku":"QTLJGFCD05195x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 12mm (Step 50mm)","offer_id":52442414088466,"sku":"QTLJGFCD05196x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 15mm (Step 50mm)","offer_id":52442414121234,"sku":"QTLJGFCD05197x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 16mm (Step 50mm)","offer_id":52442414154002,"sku":"QTLJGFCD05198x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 17mm (Step 50mm)","offer_id":52442414186770,"sku":"QTLJGFCD05199x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 19mm (Step 50mm)","offer_id":52442414219538,"sku":"QTLJGFCD05200x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 20mm (Step 50mm)","offer_id":52442414252306,"sku":"QTLJGFCD05201x1","price":96.97,"currency_code":"USD","in_stock":true},{"title":"1.5 Mod, 65T \/ 15mm, 25mm (Step 50mm)","offer_id":52442414285074,"sku":"QTLJGFCD05202x1","price":96.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_9a60793f-dc28-4649-9e9a-f7758715dbdf.jpg?v=1783497418","url":"https:\/\/homediyer.com\/products\/1-5mod-45-steel-spur-gear-65-teeth-bore-8-25mm-pinion-gear-with-step-motor-gear","provider":"HomeDIYer","version":"1.0","type":"link"}