{"product_id":"1-mod-small-gear-10t-12t-14t-16t-spur-gear-with-screw-45-steel-4-5-6-7mm-bore","title":"1 Mod Small Gear 10T 12T 14T 16T Spur Gear With Screw 45# Steel 4\/5\/6\/7mm Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 1 Small Spur Gears — Set-Screw Secured 45# Steel Pinion for Miniature Drives\u003c\/h2\u003e\n\u003cp\u003eFinding a compact, shaft-ready Mod 1 spur gear that actually fits a standard motor shaft without custom machining is a recurring headache for RC builders, robotics hobbyists, and miniature automation designers. These Mod 1 small spur gears ship with a set-screw already tapped into the hub, so you can lock the gear onto your shaft in seconds — no press-fit tools, no keyway cutting, no waiting on a machine shop.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# carbon steel for a reliable balance of surface hardness and core toughness. The Mod 1 tooth profile covers three tooth counts — 10T, 12T, and 14T — with outside diameters of 12 mm (≈0.47 in), 14 mm (≈0.55 in), and 16 mm (≈0.63 in) respectively. Bore options span 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), and 7 mm, covering the most common DC motor and stepper shaft diameters used in small-scale builds.\u003c\/p\u003e\n\u003cp\u003eTypical applications include RC car differential and steering drives where a Mod 1 pinion gear pairs with a plastic or steel rack; compact robotic joint actuators where a small-module spur gear set delivers precise angular positioning; and DIY pen plotters or mini CNC machines where a 10T–14T Mod 1 gear meshes with a matching rack or idler to move a lightweight carriage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for Module 1 (Mod 1) gear systems with a 20° pressure angle. Mates with any standard Mod 1 spur gear, rack, or pinion. Confirm your shaft diameter matches the selected bore before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 1 Small Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eSet-Screw Hub — Shaft-Ready Out of the Box\u003c\/strong\u003e\n\u003cp\u003eA pre-tapped set-screw hole in the hub lets you secure the gear directly onto your motor or drive shaft without press-fitting or keyway machining — ideal for rapid prototyping and field repairs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# medium-carbon steel, these gears offer a reliable combination of tooth-surface hardness and core toughness, resisting deformation under the cyclic loads typical of small-motor drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eModule 1 Standard — Three Tooth Counts\u003c\/strong\u003e\n\u003cp\u003eAvailable in 10T (OD 12 mm), 12T (OD 14 mm), and 14T (OD 16 mm), giving you precise gear-ratio control across a compact outside-diameter range of 12–16 mm (0.47–0.63 in).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eWide Bore Selection — 4 to 7 mm\u003c\/strong\u003e\n\u003cp\u003eFive bore options — 4 mm, 5 mm, 6 mm, 6.35 mm (1\/4 in), and 7 mm — cover the most common DC motor, stepper, and servo shaft diameters used in RC, robotics, and miniature CNC builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪶\u003c\/span\u003e \u003cstrong\u003eCompact Flat-Body Profile\u003c\/strong\u003e\n\u003cp\u003eThe slim gear body keeps axial length to a minimum, making these pinions suitable for space-constrained assemblies where a bulky hubbed gear would interfere with adjacent components or frame walls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eMachined Involute Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe precision-cut involute teeth ensure consistent mesh with any standard Mod 1 mating gear or rack, delivering smooth torque transfer and low backlash in miniature drive trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod 1 Small Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e10T \/ 12T \/ 14T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e12 mm \/ 14 mm \/ 16 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm \/ 6.35 mm \/ 7 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear with Set-Screw Hub\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eInvolute\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\u003eShaft Fixing Method\u003c\/th\u003e\n\u003ctd\u003eSet-screw (pre-tapped)\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\u003eMachined steel, light oxidation treatment\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\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eRC drives, robotics joints, mini CNC, pen plotters, miniature automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\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 tooth count for my build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect your tooth count based on the gear ratio you need and the space available. A 10T pinion paired with a 20T gear gives a 2:1 reduction; a 14T pinion with a 28T gear gives the same ratio with a larger pitch diameter. Also check that the outside diameter (12–16 mm for this Mod 1 series) clears your housing walls and adjacent components before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I choose for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bore to your motor or drive shaft diameter. Common pairings: 4 mm or 5 mm for small DC hobby motors and micro steppers; 6 mm for standard NEMA 17 stepper shafts; 6.35 mm (1\/4 in) for imperial-shaft motors common in RC and power-tool applications; 7 mm for larger DC motors. Measure your shaft with a calliper before selecting — a bore that is even 0.1 mm too small will not fit without machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"Module 1\" mean, and will this gear mesh with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModule (Mod) is the standardised metric tooth-size system. Mod 1 means the pitch diameter equals 1 × number of teeth (in mm). These gears mesh correctly with any standard Mod 1 spur gear, rack, or pinion with a matching 20° pressure angle. They are not compatible with Mod 0.5, Mod 1.5, Mod 2, or imperial DP gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set-screw connection? Will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe set-screw provides adequate holding force for the light-to-moderate torque levels typical of RC, robotics, and miniature CNC applications. For best results, ensure the shaft surface is clean and free of oil before tightening, and use a thread-locking compound (e.g. Loctite 243) on the set-screw threads. For high-torque or high-vibration environments, a flat on the shaft aligned with the set-screw significantly improves grip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe machined 45# steel surface has a light protective treatment suitable for typical indoor workshop and RC environments. For outdoor use or high-humidity conditions, apply a light gear grease or anti-corrosion spray. If long-term outdoor exposure is required, consider stainless steel or engineering-plastic gear alternatives for your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this gear with a Mod 1 rack for linear motion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — any of these Mod 1 spur gears will drive a standard Mod 1 rack to convert rotary motion into linear motion. This is a common setup for pen plotters, mini CNC axis drives, and small linear actuators. Ensure the rack’s pressure angle matches (20°) and that the gear’s outside diameter clears the rack mounting surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs one piece included per order, or can I buy multiple?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach order includes 1 piece. If you need a matched gear pair or multiple gears for a gear train, simply increase the quantity at checkout or place separate orders for different tooth counts and bore sizes to build your complete drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count, outside diameter, and bore diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1-10T \/ 12mm \/ 4mm \u0026 1pcs","offer_id":52443118960914,"sku":"XFHK-KCSJ2676x1","price":16.27,"currency_code":"USD","in_stock":true},{"title":"1-10T \/ 12mm \/ 5mm \u0026 1pcs","offer_id":52443118993682,"sku":"XFHK-KCSJ2677x1","price":15.72,"currency_code":"USD","in_stock":true},{"title":"1-12T \/ 14mm \/ 4mm \u0026 1pcs","offer_id":52443119026450,"sku":"XFHK-KCSJ2678x1","price":13.87,"currency_code":"USD","in_stock":true},{"title":"1-12T \/ 14mm \/ 5mm \u0026 1pcs","offer_id":52443119059218,"sku":"XFHK-KCSJ2679x1","price":13.87,"currency_code":"USD","in_stock":true},{"title":"1-12T \/ 14mm \/ 6mm \u0026 1pcs","offer_id":52443119091986,"sku":"XFHK-KCSJ2680x1","price":13.87,"currency_code":"USD","in_stock":true},{"title":"1-12T \/ 14mm \/ 6.35mm \u0026 1pcs","offer_id":52443119124754,"sku":"XFHK-KCSJ2681x1","price":15.72,"currency_code":"USD","in_stock":true},{"title":"1-12T \/ 14mm \/ 7mm \u0026 1pcs","offer_id":52443119157522,"sku":"XFHK-KCSJ2682x1","price":15.72,"currency_code":"USD","in_stock":true},{"title":"1-14T \/ 16mm \/ 4mm \u0026 1pcs","offer_id":52443119190290,"sku":"XFHK-KCSJ2683x1","price":16.27,"currency_code":"USD","in_stock":true},{"title":"1-14T \/ 16mm \/ 5mm \u0026 1pcs","offer_id":52443119223058,"sku":"XFHK-KCSJ2684x1","price":16.27,"currency_code":"USD","in_stock":true},{"title":"1-14T \/ 16mm \/ 6mm \u0026 1pcs","offer_id":52443119255826,"sku":"XFHK-KCSJ2685x1","price":16.27,"currency_code":"USD","in_stock":true},{"title":"1-14T \/ 16mm \/ 6.35mm \u0026 1pcs","offer_id":52443119288594,"sku":"XFHK-KCSJ2686x1","price":16.27,"currency_code":"USD","in_stock":true},{"title":"1-14T \/ 16mm \/ 7mm \u0026 1pcs","offer_id":52443119321362,"sku":"XFHK-KCSJ2687x1","price":16.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-07_32457a20-97cc-44f4-ad2c-cfec0fcc9514.jpg?v=1784017356","url":"https:\/\/homediyer.com\/products\/1-mod-small-gear-10t-12t-14t-16t-spur-gear-with-screw-45-steel-4-5-6-7mm-bore","provider":"HomeDIYer","version":"1.0","type":"link"}