{"product_id":"1-5-mod-70-teeth-spur-gears-transmission-gear-with-step-45-steel-blackening","title":"1.5 Mod 70 Teeth Spur Gears Transmission Gear With Step 45# Steel Blackening","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1.5 Mod 70-Tooth Spur Gear with Step Hub — Reliable Transmission for DIY Automation Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control project demands a gear that fits precisely, holds torque without slipping, and resists wear over thousands of cycles, a poorly dimensioned or soft-metal gear becomes the weakest link in the drivetrain. Makers, hobbyists, and small-workshop engineers building CNC machines, conveyor systems, or custom automation rigs need a 1.5 Mod 70-tooth spur gear they can trust to stay true under load.\u003c\/p\u003e\n    \u003cp\u003eThis 1.5 Module 70-tooth spur gear is machined from 45# medium-carbon steel and finished with a blackening (black oxide) surface treatment for corrosion resistance and reduced light reflection. The stepped hub design (Step 50, Tooth Thickness 15 mm) provides a positive axial shoulder for secure shaft positioning. Available bore diameters range from 10 mm (≈0.39 in) to 25 mm (≈0.98 in), covering the most common shaft sizes used in DIY and light-industrial drives.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include: open-loop stepper-motor geartrains for desktop CNC routers and laser engravers; rack-and-pinion linear drives on 3D printer gantries and pick-and-place fixtures; and speed-reduction stages in small conveyor or rotary-indexing systems where a 1.5 Mod 70-tooth spur gear pairs with a matching pinion for a clean, low-backlash mesh.\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 Meshes with any 1.5 Module (Mod 1.5) spur or helical gear of the same module. Verify bore diameter matches your shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1.5 Mod 70-Tooth 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 the toughness needed for sustained torque transmission in mechanical drives without the brittleness of cast alternatives.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\u003cstrong\u003eBlackening Surface Treatment\u003c\/strong\u003e — Black oxide finish adds a layer of corrosion resistance and reduces surface friction at the tooth flanks, extending service life in lightly oiled or dry-run environments.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e — The integrated step (Step 50, Tooth Thickness 15 mm) creates a positive axial stop, making shaft alignment repeatable and eliminating the need for additional spacers in most assemblies.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e — Choose from 10, 12, 15, 16, 17, 19, 20, or 25 mm bore diameters to match your motor or drive shaft directly, minimizing adapter hardware.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eStandard 1.5 Module Tooth Profile\u003c\/strong\u003e — Conforms to the ISO\/DIN Module 1.5 standard, ensuring interchangeability with off-the-shelf pinions, racks, and mating gears from any compliant supplier.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eVersatile Drivetrain Applications\u003c\/strong\u003e — Suited for CNC gantries, rotary indexers, conveyor drives, and custom automation rigs where a 70-tooth count provides a useful reduction ratio when paired with a smaller pinion.\u003c\/li\u003e\n    \u003c\/ul\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\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Thickness\u003c\/th\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStep (Hub Length)\u003c\/th\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e105 mm (≈4.13 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e108 mm (≈4.25 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (10 \/ 12 \/ 15 \/ 16 \/ 17 \/ 19 \/ 20 \/ 25 mm)\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\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eBlackening (Black Oxide)\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\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc per order\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 diameter for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly — for example, a 20 mm shaft requires the 20 mm bore variant. If your shaft is slightly undersized, a keyway and set-screw arrangement can compensate, but the bore should never be larger than the shaft diameter.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does \"1.5 Module\" mean, and will this gear mesh with my existing gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the ISO standard unit describing tooth size — specifically the pitch diameter divided by the number of teeth. Two gears mesh correctly only when they share the same module and pressure angle. This gear is Mod 1.5 with a 20° pressure angle, so it will mesh with any other Mod 1.5 \/ 20° spur or helical gear, regardless of tooth count.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is this gear, and what torque can it handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 45# steel body provides a tensile strength of approximately 600–800 MPa depending on heat treatment. Allowable torque depends on operating speed, lubrication, and duty cycle. For light-to-medium DIY automation loads (stepper motors up to a few Nm), this gear is well within its design envelope. For heavy industrial loads, consult a gear-strength calculation using AGMA or ISO 6336 standards.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the blackening finish protect against rust in humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides mild corrosion resistance and is best suited for indoor or lightly controlled environments. For high-humidity or outdoor applications, apply a light coat of machine oil or grease to the gear surface periodically. The finish is not a substitute for stainless steel or zinc plating in harsh wet conditions.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the purpose of the stepped hub, and do I need it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step (shoulder) on the hub acts as a built-in axial locator — it seats against a bearing face or housing wall so the gear sits at a precise position along the shaft without needing a separate spacer. If your design already uses shaft collars or other locating features, the step simply adds redundancy. It does not interfere with standard mounting.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat pinion tooth count should I pair with this 70-tooth gear for a specific reduction ratio?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDivide 70 by your desired ratio to find the pinion tooth count. For example: a 7:1 reduction needs a 10-tooth pinion; a 3.5:1 reduction needs a 20-tooth pinion. All mating pinions must be Mod 1.5 with a 20° pressure angle. Center distance = (70 + pinion teeth) × 1.5 \/ 2 mm.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs lubrication required, and what type is recommended?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLubrication is strongly recommended for continuous-duty operation. A light machine oil (ISO VG 46–68) or open-gear grease applied to the tooth flanks will significantly reduce wear and noise. For intermittent or low-speed hobby use, a thin film of white lithium grease is a practical choice.\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 \u003cstrong\u003ebore diameter and model\u003c\/strong\u003e 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 diameter for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly. The bore should never be larger than the shaft diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does '1.5 Module' mean, and will this gear mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module (Mod) is the ISO standard unit describing tooth size. This gear is Mod 1.5 with a 20° pressure angle, so it will mesh with any other Mod 1.5 \/ 20° spur or helical gear, regardless of tooth count.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is this gear, and what torque can it handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 45# steel body provides a tensile strength of approximately 600–800 MPa. For light-to-medium DIY automation loads (stepper motors up to a few Nm), this gear is well within its design envelope.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the blackening finish protect against rust in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides mild corrosion resistance suited for indoor environments. For high-humidity applications, apply a light coat of machine oil or grease periodically.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the purpose of the stepped hub, and do I need it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step (shoulder) on the hub acts as a built-in axial locator, seating against a bearing face or housing wall so the gear sits at a precise position along the shaft without needing a separate spacer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What pinion tooth count should I pair with this 70-tooth gear for a specific reduction ratio?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide 70 by your desired ratio to find the pinion tooth count. For example: a 7:1 reduction needs a 10-tooth pinion. All mating pinions must be Mod 1.5 with a 20° pressure angle. Center distance = (70 + pinion teeth) × 1.5 \/ 2 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is lubrication required, and what type is recommended?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Lubrication is strongly recommended for continuous-duty operation. A light machine oil (ISO VG 46–68) or open-gear grease applied to the tooth flanks will significantly reduce wear and noise.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 10mm \/ 1 pcs","offer_id":52443230077202,"sku":"GLFBFHHGLBZSJ058010x1","price":154.03,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 12mm \/ 1 pcs","offer_id":52443230109970,"sku":"GLFBFHHGLBZSJ058011x1","price":154.03,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 15mm \/ 1 pcs","offer_id":52443230142738,"sku":"GLFBFHHGLBZSJ058012x1","price":154.03,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 16mm \/ 1 pcs","offer_id":52443230175506,"sku":"GLFBFHHGLBZSJ058013x1","price":154.03,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 17mm \/ 1 pcs","offer_id":52443230208274,"sku":"GLFBFHHGLBZSJ058014x1","price":154.39,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 19mm \/ 1 pcs","offer_id":52443230241042,"sku":"GLFBFHHGLBZSJ058015x1","price":154.39,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 20mm \/ 1 pcs","offer_id":52443230273810,"sku":"GLFBFHHGLBZSJ058016x1","price":154.39,"currency_code":"USD","in_stock":true},{"title":"1.5M 70T, Step 50, Tooth Thickness 15 \/ 25mm \/ 1 pcs","offer_id":52443230306578,"sku":"GLFBFHHGLBZSJ058017x1","price":154.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-05_8bce57b3-752e-48e3-a786-329667f523e2.jpg?v=1784040034","url":"https:\/\/homediyer.com\/products\/1-5-mod-70-teeth-spur-gears-transmission-gear-with-step-45-steel-blackening","provider":"HomeDIYer","version":"1.0","type":"link"}