{"product_id":"1-5-mod-spur-gear-45-steel-12t-35t-bore-5-6-8mm","title":"1.5 Mod 12T-35T 45# Steel Spur Gear Common Bore 5 6 8mm With Fixing Screw X 1Pcs","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e1.5 Module 45# Steel Spur Gear — Precision-Cut Drive Gear for DIY \u0026amp; Mechanical Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen your build demands a reliable, metal-tooth gear that won't strip under load, finding the right module and bore combination can be frustrating. Whether you're a robotics hobbyist, RC vehicle builder, or mechanical engineer prototyping a drive train, this 1.5 Mod 45# steel spur gear gives you a ready-to-mount solution with a pre-drilled bore and a fixing screw included — no extra machining required.\u003c\/p\u003e\n    \u003cp\u003eEach gear is CNC-machined from 45# medium-carbon steel, offering a good balance of hardness and toughness. Available tooth counts range from 12T to 35T, with bore options of 5mm (~0.197\"), 6mm (~0.236\"), and 8mm (~0.315\"). The 1.5 module pitch means the gear pitch diameter ranges from approximately 18mm (12T) to 52.5mm (35T), keeping the footprint compact for space-constrained assemblies.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY gearbox assemblies for tabletop robots and automation rigs, replacement drive gears for RC cars and crawlers needing a 1.5 mod mesh, and custom torque-reduction stages in maker projects such as motorized camera sliders or conveyor prototypes.\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 pinion gear. Verify bore diameter matches your shaft before ordering. Fixing screw included for shaft retention.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 1.5 Mod 45# 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\n        \u003cp\u003eMachined from 45# steel for a solid combination of wear resistance and impact toughness — suitable for moderate-to-high torque drive applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e1.5 Module Standard Pitch\u003c\/strong\u003e\n        \u003cp\u003eConforms to the 1.5 Mod gear standard, ensuring direct mesh compatibility with any other 1.5 Module gear in your drivetrain without custom adaptation.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Tooth Count Options (12T – 35T)\u003c\/strong\u003e\n        \u003cp\u003eSix tooth count variants let you dial in your gear ratio precisely — from the compact 12T pinion up to the 35T wheel for torque multiplication.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eCommon Bore Sizes: 5mm, 6mm, 8mm\u003c\/strong\u003e\n        \u003cp\u003eThree bore options cover the most widely used shaft diameters in hobby motors, stepper motors, and DC gearmotor outputs — no reaming needed for standard shafts.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🪛\u003c\/span\u003e\n        \u003cstrong\u003eFixing Screw Included\u003c\/strong\u003e\n        \u003cp\u003eEach gear ships with a set screw for secure shaft retention, so you can mount and lock the gear immediately without sourcing additional hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003eCNC-Machined Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eTeeth are CNC-cut to involute profile tolerances, delivering smooth mesh engagement, reduced backlash, and consistent performance across the full tooth count range.\u003c\/p\u003e\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\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count (T)\u003c\/th\u003e\n\u003ctd\u003e12T \/ 15T \/ 20T \/ 25T \/ 30T \/ 35T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5mm \/ 6mm \/ 8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e18mm – 52.5mm (0.71\" – 2.07\")\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute, CNC-machined\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\u003eHub \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFixing Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel \/ lightly oiled\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\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 tooth count for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYour gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 12T pinion with a 30T wheel gives a 2.5:1 reduction. Choose a higher tooth count on the output gear for more torque, or a lower count for more speed. If you're replacing an existing gear, match the tooth count exactly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size should I select for my motor shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or shaft diameter with calipers before ordering. Common hobby motor output shafts are 5mm or 6mm; many NEMA 17 stepper motors use a 5mm shaft; larger DC gearmotors often use 8mm. The bore must match your shaft diameter — the included set screw handles retention but cannot compensate for a mismatched bore.\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 gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any two gears of the same module (1.5 Mod) and the same pressure angle (20°) will mesh correctly regardless of tooth count. Confirm that your existing gear is marked or specified as Module 1.5 \/ Mod 1.5 before purchasing.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is 45# steel compared to aluminum or plastic gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# medium-carbon steel is significantly harder and more wear-resistant than aluminum alloy gears, and far stronger than nylon or POM plastic gears. It is well-suited for moderate-to-high torque applications. For very high-speed, low-load applications where noise reduction matters, plastic gears may be preferred; for durability under load, steel is the better choice.\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 limited inherent corrosion resistance compared to stainless steel. For indoor or dry-environment use, the light oil finish provides adequate short-term protection. For outdoor or humid environments, we recommend applying a thin coat of grease or anti-rust oil after installation 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 in a high-speed application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are suitable for moderate-speed applications typical of robotics, RC vehicles, and DIY automation (generally up to a few hundred RPM at the gear). For very high-speed industrial applications, consult the specific load and speed ratings with an engineer, as surface finish and lubrication become critical factors.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the listing price cover one gear or a set?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach listing is for 1 piece (x1 gear) plus the included fixing set screw. If you need multiple gears or a matched pair, simply adjust the quantity at checkout or add multiple variants to your cart.\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 tooth count (Types) and bore diameter 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 tooth count for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Your gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 12T pinion with a 30T wheel gives a 2.5:1 reduction. Choose a higher tooth count on the output gear for more torque, or a lower count for more speed. If you're replacing an existing gear, match the tooth count exactly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or shaft diameter with calipers before ordering. Common hobby motor output shafts are 5mm or 6mm; many NEMA 17 stepper motors use a 5mm shaft; larger DC gearmotors often use 8mm. The bore must match your shaft diameter — the included set screw handles retention but cannot compensate for a mismatched bore.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with my existing 1.5 Mod gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two gears of the same module (1.5 Mod) and the same pressure angle (20°) will mesh correctly regardless of tooth count. 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For outdoor or humid environments, apply a thin coat of grease or anti-rust oil after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this gear in a high-speed application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are suitable for moderate-speed applications typical of robotics, RC vehicles, and DIY automation. For very high-speed industrial applications, consult specific load and speed ratings with an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the listing price cover one gear or a set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each listing is for 1 piece (x1 gear) plus the included fixing set screw. If you need multiple gears, adjust the quantity at checkout or add multiple variants to your cart.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.5Mod 12T \/ 5mm","offer_id":52442058785042,"sku":"GF0001","price":11.19,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 12T \/ 8mm","offer_id":52442058817810,"sku":"GF0002","price":11.19,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 15T \/ 5mm","offer_id":52442058850578,"sku":"GF0003","price":12.55,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 20T \/ 8mm","offer_id":52442058883346,"sku":"GF0004","price":13.03,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 25T \/ 8mm","offer_id":52442058916114,"sku":"GF0005","price":16.02,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 30T \/ 6mm","offer_id":52442058948882,"sku":"GF0006","price":23.26,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 30T \/ 8mm","offer_id":52442058981650,"sku":"GF0007","price":20.1,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 35T \/ 6mm","offer_id":52442059014418,"sku":"GF0008","price":24.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_662ef5bb-a122-47e6-8f47-7f3a2dd7180d.jpg?v=1783406877","url":"https:\/\/homediyer.com\/products\/1-5-mod-spur-gear-45-steel-12t-35t-bore-5-6-8mm","provider":"HomeDIYer","version":"1.0","type":"link"}