{"product_id":"1-5-mod-12-teeth-spur-gears-bore-5-8mm-transmission-gear-with-step-45-steel","title":"1.5 Mod 12 Teeth Spur Gears Bore 5-8mm Transmission Gear With Step 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1.5 Mod 12-Tooth Stepped Spur Gear — Precision 45# Steel for DIY Automation Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control project demands consistent torque transfer and tight dimensional tolerances, a poorly fitted gear can derail the entire build. Makers, robotics hobbyists, and small-workshop engineers who need a reliable 1.5 Mod 12-tooth spur gear with a stepped bore will find this component ready to drop into their drivetrain 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 stepped hub design allows the gear to seat securely against a shoulder on the shaft, reducing axial play. Bore options span 5 mm to 8 mm (approximately 0.197 in to 0.315 in), covering the most common shaft diameters used in compact automation and robotics platforms. Overall gear diameter is approximately 19.5 mm (0.77 in) based on the 1.5 module and 12-tooth count (PCD = Module × Teeth = 18 mm).\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY conveyor belt drives using 1.5M timing-adjacent spur stages, small CNC axis gear reduction trains, and educational robotics kits requiring interchangeable stepped-bore gears. The multi-piece packing options (1–10 pcs) make it straightforward to stock spares or build symmetric gear pairs for balanced load distribution.\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 Fits shafts of 5 mm, 6 mm, 6.35 mm (1\/4 in), 7 mm, and 8 mm diameter. Module 1.5 — meshes with any standard Mod 1.5 spur or helical gear of matching pressure angle (typically 20°). Verify shaft diameter and gear mesh clearance before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 1.5 Mod 12-Tooth Stepped Spur Gears\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n      \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eMachined from 45# steel for a reliable combination of surface hardness and core toughness, suitable for moderate-load gear mesh applications in automation and robotics.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n      \u003cstrong\u003eModule 1.5 — 12 Teeth\u003c\/strong\u003e\n      \u003cp\u003eStandard Mod 1.5 tooth profile ensures interchangeability with other Mod 1.5 gears. 12-tooth count delivers a compact pitch circle diameter of 18 mm for space-constrained drivetrains.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n      \u003cstrong\u003eStepped Hub Design\u003c\/strong\u003e\n      \u003cp\u003eThe integrated step on the hub provides a positive axial stop against a shaft shoulder, reducing end-play and keeping the gear positioned accurately under dynamic loads.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n      \u003cstrong\u003eFive Bore Sizes Available\u003c\/strong\u003e\n      \u003cp\u003eChoose from 5 mm, 6 mm, 6.35 mm, 7 mm, or 8 mm bore to match your shaft without sleeve adapters. Select your bore size from the variant options above.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n      \u003cstrong\u003eFlexible Pack Quantities (1–10 pcs)\u003c\/strong\u003e\n      \u003cp\u003eOrder a single gear for a prototype or up to 10 pieces for a full build run. Multi-pack pricing offers better per-unit value for larger projects.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n      \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e\n      \u003cp\u003eSuited for DIY conveyor drives, CNC axis reduction stages, educational robotics kits, and small automation platforms where a compact, stepped-bore spur gear is required.\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 (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\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter (PCD)\u003c\/th\u003e\n\u003ctd\u003e18 mm (0.709 in)\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\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStepped hub\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e5 mm \/ 6 mm \/ 6.35 mm \/ 7 mm \/ 8 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 Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOverall Gear Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Outer Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 \/ 8 \/ 10 pcs\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 shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper. Select the bore that matches exactly — 5 mm, 6 mm, 6.35 mm (common for 1\/4-inch shafts), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small will not fit without machining. Use the Size variant selector above to pick your bore.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Mod 1.5 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any two gears with the same module (1.5) and the same pressure angle (20° standard) will mesh correctly regardless of tooth count. Verify that the center distance between shafts equals (Teeth₁ + Teeth₂) × Module \/ 2 to ensure proper backlash.\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 is widely used for moderate-load gear applications. It offers good tensile strength (typically 600–800 MPa depending on heat treatment) and can be surface-hardened if needed. For very high-torque or high-speed continuous-duty applications, consider whether a hardened or alloy-steel gear would be more appropriate for your load case.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the stepped hub prevent the gear from sliding along the shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe step provides a positive axial stop when the gear seats against a shaft shoulder or retaining feature. For full axial retention, pair it with a set screw, retaining ring, or shaft collar on the opposite side. Check the variant detail for set screw availability on this model.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this gear corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel is not inherently corrosion-resistant. For humid or outdoor environments, apply a light machine oil or grease to the gear surfaces, or consider a protective coating. If long-term corrosion resistance is critical, a stainless-steel or plastic gear may be a better fit for your application.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I order 1 pc to test fit before buying a multi-pack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThat is a practical approach for new builds. Order a single piece first to confirm bore fit, mesh engagement, and hub clearance in your assembly. Once validated, the 5-pack or 10-pack options offer better per-unit value for production runs or spare-parts stocking.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the pitch circle diameter and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pitch circle diameter (PCD) is calculated as Module × Teeth = 1.5 × 12 = 18 mm. This is the theoretical circle at which two meshing gears make contact. You need the PCD of both gears to calculate the correct center-to-center shaft distance for your gearbox or drive stage.\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 size and pack quantity\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 size for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your shaft diameter with a caliper. Select the bore that matches exactly — 5 mm, 6 mm, 6.35 mm (common for 1\/4-inch shafts), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small will not fit without machining.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing Mod 1.5 gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any two gears with the same module (1.5) and the same pressure angle (20° standard) will mesh correctly regardless of tooth count. Verify center distance equals (Teeth₁ + Teeth₂) × Module \/ 2.\"\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 good tensile strength (typically 600–800 MPa) and is suitable for moderate-load gear applications. For very high-torque or continuous-duty use, consider a hardened or alloy-steel gear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the stepped hub prevent the gear from sliding along the shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The step provides a positive axial stop when seated against a shaft shoulder. For full axial retention, pair it with a set screw, retaining ring, or shaft collar on the opposite side.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this gear corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# steel is not inherently corrosion-resistant. Apply machine oil or grease for humid environments, or consider a stainless-steel or plastic gear for long-term corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I order 1 pc to test fit before buying a multi-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, ordering a single piece first to confirm bore fit and mesh engagement is a practical approach. Once validated, the 5-pack or 10-pack options offer better per-unit value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pitch circle diameter and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"PCD = Module × Teeth = 1.5 × 12 = 18 mm. This is the theoretical contact circle used to calculate the correct center-to-center shaft distance when designing a gear stage.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5M 12T, Bore 5mm \/ 1 pcs","offer_id":52443220738322,"sku":"GLFBFHHGLBZSJ057770x1","price":10.58,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T, Bore 6mm \/ 1 pcs","offer_id":52443220771090,"sku":"GLFBFHHGLBZSJ057771x1","price":10.58,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T, Bore 6.35mm \/ 1 pcs","offer_id":52443220803858,"sku":"GLFBFHHGLBZSJ057772x1","price":10.58,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T, Bore 7mm \/ 1 pcs","offer_id":52443220836626,"sku":"GLFBFHHGLBZSJ057773x1","price":10.58,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T, Bore 8mm \/ 1 pcs","offer_id":52443220869394,"sku":"GLFBFHHGLBZSJ057774x1","price":10.58,"currency_code":"USD","in_stock":true},{"title":"1.5M 12T, Bore 5mm \/ 2 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