{"product_id":"30t-mod1-steel-pinion-gear-with-set-screw-5-17mm-bore-straight-tooth-spur-gears","title":"30T Mod1 Steel Pinion Gear With Set Screw 5-17mm Bore Straight Tooth Spur Gears","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e30T Mod1 Steel Pinion Gear — Precision Straight-Tooth Spur Gear for Reliable Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or mismatched gear ruins your build mid-project, the frustration is real — especially for RC hobbyists, robotics engineers, and mechanical DIYers who need exact tooth engagement and a secure shaft fit. These 30T Mod1 steel pinion gears with set screw are engineered for builders who demand dimensional accuracy and repeatable performance across every drive system they assemble.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from carbon steel, featuring 30 teeth at Module 1 (Mod1) pitch. The bore range spans 5 mm to 17 mm (approximately 0.197\" to 0.669\"), with three hub configurations available: standard round bore, key slot bore (for keyed shafts), and D-hole bore (for flat-sided motor shafts). An M3 set screw locks the gear firmly onto the shaft to prevent rotational slip under load.\u003c\/p\u003e\n\u003cp\u003eThese 30T Mod1 spur gears are well-suited for RC car and truck drivetrain upgrades, small servo and stepper motor gearbox assemblies, custom CNC router axis drives, and tabletop robotics platforms where a compact, straight-tooth gear ratio is required. The Mod1 tooth profile also makes them directly interchangeable with other Mod1 gears in mixed-brand gear trains.\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 all Mod1 (Module 1) gear systems. Verify shaft diameter and hub type (Round \/ Key Slot \/ D-Hole) before ordering. Set screw thread: M3.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 30T Mod1 Steel Pinion Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷 \u003cstrong\u003e30 Teeth, Module 1 Pitch\u003c\/strong\u003e\u003cbr\u003eStandard Mod1 tooth profile ensures direct mesh compatibility with any other Mod1 rack, pinion, or spur gear — no custom machining needed.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩 \u003cstrong\u003eM3 Set Screw Included\u003c\/strong\u003e\u003cbr\u003eA recessed M3 grub screw clamps the gear firmly to the shaft, preventing rotational slip under torque without requiring adhesive or press-fit tools.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🕳️ \u003cstrong\u003eThree Hub Configurations\u003c\/strong\u003e\u003cbr\u003eChoose from standard round bore (5–17 mm), key slot bore (for keyed shafts), or D-hole bore (for flat-sided motor shafts) to match your exact drive setup.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧 \u003cstrong\u003eWide Bore Range: 5–17 mm\u003c\/strong\u003e\u003cbr\u003eCovers the most common motor and shaft diameters used in RC vehicles, robotics, and small machinery — from 5 mm (0.197\") up to 17 mm (0.669\").\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️ \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\u003cbr\u003eMachined from carbon steel for solid load-bearing capacity and resistance to deformation under the cyclic stresses of gear-driven applications.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦 \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\u003cbr\u003eAvailable in 1, 2, 5, or 10-piece packs — order a single replacement or stock up for a full build or repair inventory at a lower per-unit cost.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod1 Steel Pinion Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003eMod1 (Module 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eStraight tooth (spur)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eRound bore \/ Key slot bore \/ D-hole bore (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 mm – 17 mm (0.197\" – 0.669\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKey Slot Dimensions\u003c\/th\u003e\n\u003ctd\u003eSee variant options (e.g. 8×3×1.4 mm, 10×3×1.4 mm, 10×4×1.8 mm, 12×4×1.8 mm, 12.7×5×2.3 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eD-Hole Dimensions\u003c\/th\u003e\n\u003ctd\u003eSee variant options (e.g. 6×5 mm, 8×7 mm, 10×9 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw Thread\u003c\/th\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003eSee 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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 PCS (see 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\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 diameter with a caliper. For a round shaft, select the matching round bore (e.g. 6 mm shaft → 6 mm bore). For a shaft with a flat side, choose the D-hole variant whose round dimension matches your shaft. For a keyed shaft, select the key slot variant and confirm the key width and height match your key stock.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is Module 1 (Mod1) and will this gear mesh with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eModule (Mod) is the metric standard for gear tooth size. Mod1 means the pitch diameter in mm equals the number of teeth — so a 30T Mod1 gear has a 30 mm pitch diameter. Any two Mod1 gears will mesh correctly regardless of brand, as long as both are Mod1. Do not mix Mod1 with Mod0.8, Mod1.25, or other modules.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the set screw included, and what tool do I need to tighten it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, an M3 set screw (grub screw) is included with each gear. You will need a 1.5 mm or 2 mm hex key (Allen key) to tighten it. Apply a small amount of thread-locking compound if the gear will experience significant vibration or reversing loads.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is this gear — can it handle the torque of my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears are machined from carbon steel, which provides solid strength for RC drivetrains, robotics, and light-to-medium mechanical drives. The actual torque capacity depends on face width, operating speed, and lubrication. For heavy industrial loads or continuous high-speed operation, contact us to confirm suitability before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear rust or corrode if used outdoors or in humid conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel can oxidize if exposed to moisture without protection. For outdoor or humid environments, apply a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is a primary requirement, consider stainless steel or plastic gear alternatives for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the Round Bore, Key Slot, and D-Hole variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e\u003cstrong\u003eRound Bore:\u003c\/strong\u003e A plain circular hole — the set screw alone holds the gear on the shaft. Suitable for smooth round shafts. \u003cstrong\u003eKey Slot:\u003c\/strong\u003e The bore has a rectangular slot that accepts a standard key, providing positive rotational locking for keyed shafts. \u003cstrong\u003eD-Hole:\u003c\/strong\u003e The bore has one flat side matching a D-shaped motor shaft (common on many DC and stepper motors), preventing rotation without a separate key.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order just one gear, or do I have to buy a pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYou can order as few as 1 piece. Pack options of 1, 2, 5, and 10 pieces are available — multi-pack options offer a lower per-unit cost and are useful for stocking spares or building multiple identical drive stages.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your NO. of Teeth, Hole Size, and Qty 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 diameter with a caliper. For a round shaft, select the matching round bore. For a shaft with a flat side, choose the D-hole variant. For a keyed shaft, select the key slot variant and confirm the key dimensions match your key stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is Module 1 (Mod1) and will this gear mesh with my existing gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Module 1 means the pitch diameter in mm equals the number of teeth. Any two Mod1 gears will mesh correctly regardless of brand. Do not mix Mod1 with other modules such as Mod0.8 or Mod1.25.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the set screw included, and what tool do I need to tighten it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, an M3 set screw is included. You will need a 1.5 mm or 2 mm hex key to tighten it. Apply thread-locking compound if the gear will experience vibration or reversing loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is this gear — can it handle the torque of my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These gears are machined from carbon steel, suitable for RC drivetrains, robotics, and light-to-medium mechanical drives. Actual torque capacity depends on face width, speed, and lubrication. Contact us to confirm suitability for heavy industrial loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear rust or corrode if used outdoors or in humid conditions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel can oxidize without protection. Apply a light machine oil or grease after installation for outdoor or humid environments. Consider stainless steel or plastic alternatives if corrosion resistance is a primary requirement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the Round Bore, Key Slot, and D-Hole variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Round Bore: a plain circular hole held by the set screw. Key Slot: has a rectangular slot for a standard key, providing positive rotational locking. D-Hole: has one flat side matching a D-shaped motor shaft, preventing rotation without a separate key.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order just one gear, or do I have to buy a pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"You can order as few as 1 piece. Pack options of 1, 2, 5, and 10 pieces are available, with multi-pack options offering a lower per-unit cost.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"30T \/ 5mm \/ 1PCS","offer_id":52442345111826,"sku":"TJJTCD00578x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 6mm \/ 1PCS","offer_id":52442345144594,"sku":"TJJTCD00579x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 6.35mm \/ 1PCS","offer_id":52442345177362,"sku":"TJJTCD00580x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 7mm \/ 1PCS","offer_id":52442345210130,"sku":"TJJTCD00581x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 8mm \/ 1PCS","offer_id":52442345242898,"sku":"TJJTCD00582x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 10mm \/ 1PCS","offer_id":52442345275666,"sku":"TJJTCD00583x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"30T \/ 12mm \/ 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