{"product_id":"mod-1-steel-pinion-gear-spur-gears-12-30-teeth-6-15mm-bore-with-screw-hardened","title":"Mod 1 Steel Pinion Gear Spur Gears 12-30 Teeth 6-15mm Bore With Screw Hardened","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 1 Steel Pinion Spur Gears — Precision Drive Components for Robotics \u0026amp; DIY Builds\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion system demands repeatable, low-backlash power transfer, a poorly matched gear becomes the weakest link in the chain. Engineers, robotics builders, and hands-on makers who need a reliable Mod 1 steel pinion spur gear with a configurable bore will find this component ready to drop into demanding drive trains without compromise.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from hardened steel and follows the Metric Module 1 (Mod 1) standard, with a pitch diameter equal to the number of teeth in millimeters. Available tooth counts run from 12 to 30 teeth, and bore options span 5 mm, 6 mm, 6.35 mm (1\/4 in), 8 mm, 10 mm, 12 mm, 14 mm + 5 mm keyway, and 15 mm — covering the most common motor shaft diameters used in hobby and light-industrial applications. A radial set screw is included to lock the gear securely onto the shaft.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DC motor pinion drives in wheeled robots and rover platforms, lead-screw stage gearing in desktop CNC routers and laser cutters, and reduction stages in 3D-printer extruder or axis drive assemblies where a compact Mod 1 spur gear pair keeps the footprint small.\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 Mod 1 metric standard — meshes with any Mod 1 spur or pinion gear. Verify bore diameter matches your motor or shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Mod 1 Steel Pinion 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\u003eHardened Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eMachined from carbon steel with surface hardening for wear resistance under continuous meshing loads in robotics and automation drives.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eMod 1 Metric Standard\u003c\/strong\u003e\n        \u003cp\u003eStrict Module 1 tooth profile ensures accurate meshing with any Mod 1 counterpart gear — no custom tooling or adaptation required.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Tooth Count Selection (12–30 T)\u003c\/strong\u003e\n        \u003cp\u003eNineteen tooth-count options let you dial in the exact gear ratio your drive system needs without resorting to custom machining.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cstrong\u003eMulti-Bore Options with Set Screw\u003c\/strong\u003e\n        \u003cp\u003eBore sizes from 5 mm to 15 mm (including 6.35 mm \/ 1\/4 in and a 14 mm keyway variant) cover the most common motor shaft standards. Included set screw locks the gear axially.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eSingle or Twin-Pack Quantities\u003c\/strong\u003e\n        \u003cp\u003eOrder 1 PCS for a single-stage drive or 2 PCS to build a matched gear pair in one transaction — both options ship as a single unit.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eLow-Backlash Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003ePrecision-cut involute teeth minimize angular play, making these gears suitable for position-sensitive applications such as CNC axis drives and servo-driven mechanisms.\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 — Mod 1 Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Standard\u003c\/th\u003e\n\u003ctd\u003eMetric Module 1 (Mod 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e12 – 30 Teeth (see variant options)\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 \/ 8 mm \/ 10 mm \/ 12 mm \/ 14 mm + Keyway \/ 15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003eEqual to tooth count in mm (e.g., 20 T = 20 mm PD)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard involute)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHardened carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShaft Locking\u003c\/th\u003e\n\u003ctd\u003eRadial set screw (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e5 mm keyway available on 14 mm bore variant\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS or 2 PCS (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHub Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 tooth count for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio between two meshing Mod 1 spur gears equals the ratio of their tooth counts. For example, pairing a 12-tooth pinion with a 24-tooth gear gives a 2:1 reduction. Choose a smaller tooth count (12–16 T) for higher speed output and a larger count (24–30 T) when you need more torque at lower RPM. Always verify center distance: for Mod 1 gears, center distance = (T1 + T2) \/ 2 mm.\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\u003eMatch the bore to your motor or shaft diameter exactly. Common DC hobby motors use 3 mm, 4 mm, 5 mm, or 6 mm shafts; NEMA 17 stepper motors typically use a 5 mm shaft; larger servo or gearbox outputs often use 6 mm, 8 mm, or 10 mm shafts. The 6.35 mm (1\/4 in) bore suits imperial-standard shafts. If your shaft is 14 mm and requires a key, select the 14 mm + Keyway 5 mm variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gears are machined from carbon steel with surface hardening, giving them significantly higher fatigue strength than brass or plastic alternatives. Exact load ratings depend on operating speed, lubrication, and duty cycle. For continuous high-torque applications, we recommend applying a light gear grease and ensuring proper shaft alignment to maximize service life.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eHardened carbon steel offers good mechanical strength but has limited inherent corrosion resistance. For indoor robotics, CNC, and dry environments these gears perform reliably without additional treatment. In humid or outdoor environments, apply a thin film of anti-rust grease or consider periodic re-lubrication to prevent surface oxidation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these mesh with gears I already have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any Mod 1 spur gear meshes with any other Mod 1 spur gear of the same pressure angle (20°), regardless of tooth count. These gears are not compatible with Mod 0.5, Mod 0.8, Mod 1.5, or DP-standard gears. If you are unsure of your existing gear's module, measure the outer diameter in mm and divide by (tooth count + 2); a result close to 1.0 confirms Mod 1.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 1 PCS and 2 PCS options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth options ship the same gear in the same specification. Selecting 2 PCS means you receive two identical gears in one order — useful when building a matched pinion pair, replacing both gears in a drive stage simultaneously, or keeping a spare on hand. The per-unit price is slightly lower on the 2 PCS option for most configurations.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the set screw require a specific tool?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe radial set screw uses a standard hex (Allen) socket head. A metric hex key in the appropriate size (typically 1.5 mm – 3 mm depending on the screw size) is required. Tighten the set screw firmly against a flat on the shaft where possible to prevent rotation under load.\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 Gear Module, Number of Teeth, and Bore \u0026amp; Amount 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 application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gear ratio between two meshing Mod 1 spur gears equals the ratio of their tooth counts. For example, pairing a 12-tooth pinion with a 24-tooth gear gives a 2:1 reduction. Choose a smaller tooth count (12–16 T) for higher speed output and a larger count (24–30 T) when you need more torque at lower RPM. Center distance for Mod 1 gears = (T1 + T2) \/ 2 mm.\"\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\": \"Match the bore to your motor or shaft diameter exactly. Common DC hobby motors use 3–6 mm shafts; NEMA 17 steppers use 5 mm; larger outputs often use 6–10 mm. The 6.35 mm bore suits 1\/4 in imperial shafts. Select the 14 mm + Keyway 5 mm variant for keyed 14 mm shafts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these gears under load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The gears are machined from hardened carbon steel, giving them significantly higher fatigue strength than brass or plastic alternatives. Apply light gear grease and ensure proper shaft alignment to maximize service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Hardened carbon steel has limited inherent corrosion resistance. For indoor and dry environments these gears perform reliably. In humid or outdoor environments, apply a thin film of anti-rust grease or re-lubricate periodically.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these mesh with gears I already have?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Any Mod 1 spur gear meshes with any other Mod 1 spur gear at 20° pressure angle. These are not compatible with Mod 0.5, Mod 0.8, Mod 1.5, or DP-standard gears. To confirm Mod 1: measure outer diameter in mm and divide by (tooth count + 2); a result near 1.0 confirms Mod 1.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 1 PCS and 2 PCS options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both options ship the same gear. Selecting 2 PCS means you receive two identical gears in one order — useful for matched pinion pairs, replacing both gears in a drive stage, or keeping a spare on hand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the set screw require a specific tool?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The radial set screw uses a standard hex (Allen) socket head. A metric hex key (typically 1.5–3 mm) is required. Tighten against a flat on the shaft where possible to prevent rotation under load.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1 Modulus \/ 12 Teeth \/ 6mm \u0026 1 PCS","offer_id":52442997457170,"sku":"GYJLTHXCDZH0606x1","price":9.51,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 12 Teeth \/ 6.35mm \u0026 1 PCS","offer_id":52442997489938,"sku":"GYJLTHXCDZH0607x1","price":11.36,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 12 Teeth \/ 8mm \u0026 1 PCS","offer_id":52442997522706,"sku":"GYJLTHXCDZH0608x1","price":11.36,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 13 Teeth \/ 6mm \u0026 1 PCS","offer_id":52442997555474,"sku":"GYJLTHXCDZH0609x1","price":10.0,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 13 Teeth \/ 8mm \u0026 1 PCS","offer_id":52442997588242,"sku":"GYJLTHXCDZH0610x1","price":10.0,"currency_code":"USD","in_stock":true},{"title":"1 Modulus \/ 14 Teeth \/ 6mm \u0026 1 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