{"product_id":"spur-gears-pinion-gear-5-mod-transmission-gear-10-46-teeth-45-steel-flat-gear","title":"Spur Gears Pinion Gear 5 Mod Transmission Gear 10~46 Teeth 45# Steel Flat Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpur Gears Pinion Gear 5 Mod — Reliable Flat Gear Transmission for DIY Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your drive system demands consistent torque transfer and precise tooth engagement, a poorly matched gear becomes the weakest link in your build. Whether you are a maker assembling a custom conveyor, a hobbyist building a motorized platform, or a small workshop engineer prototyping a reduction drive, these 5 mod spur gears pinion gears give you the dimensional accuracy and material strength to keep your project running without slop or premature wear.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# carbon steel, a medium-carbon alloy known for its balanced hardness and machinability. The module (mod) is 5, meaning each tooth pitch diameter equals 5 mm per tooth — so a 20-tooth gear has a pitch diameter of 100 mm (3.94 in). The tooth count range spans 10 to 46 teeth, covering pitch diameters from approximately 50 mm (1.97 in) up to 230 mm (9.06 in). The flat gear profile ensures straightforward parallel-shaft meshing with no helical offset.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY CNC axis drives where a pinion gear meshes with a rack for linear motion, rotary indexing tables in small machine shops, and motorized gate or winch reduction stages where a compact spur gear set replaces a bulkier gearbox. The 5 mod standard also makes these gears interchangeable with other metric module-5 components widely used in automation hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with any metric \u003cstrong\u003eModule 5 (Mod 5)\u003c\/strong\u003e rack, pinion, or mating spur gear. Designed for parallel-shaft drives with standard 20° pressure angle.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Spur Gears Pinion Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\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 for a strong balance of hardness, toughness, and machinability — suited for sustained rotational loads in mechanical drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eModule 5 Standard Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eStrict Mod 5 geometry ensures accurate meshing with any compatible module-5 rack or mating gear, minimizing backlash and noise in your drive train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Selection (10–46 Teeth)\u003c\/strong\u003e\n\u003cp\u003eChoose from 10 to 46 teeth to dial in your gear ratio. More teeth mean a larger pitch diameter and smoother load distribution; fewer teeth give a more compact pinion for tight spaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eFlat Gear Profile for Parallel Shafts\u003c\/strong\u003e\n\u003cp\u003eThe straight-cut flat gear design transmits power efficiently between parallel shafts with no axial thrust load, simplifying bearing selection and housing design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eTransmission-Ready Pinion Gear\u003c\/strong\u003e\n\u003cp\u003eEngineered as a transmission gear for use in reduction stages, rack-and-pinion linear drives, and rotary indexing systems where repeatable positioning matters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e \u003cstrong\u003eDIY and Workshop Compatible\u003c\/strong\u003e\n\u003cp\u003eStandard metric module sizing makes these gears easy to source, replace, and integrate into existing Mod 5 gear trains without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Spur Gear Pinion\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\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 – 46 Teeth (see variant options)\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\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 (Flat \/ Straight-Cut)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter Range\u003c\/th\u003e\n\u003ctd\u003e50 mm – 230 mm (1.97 in – 9.06 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\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\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\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 application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the tooth count based on your required gear ratio and available space. Divide the driven gear teeth by the driving pinion teeth to get the ratio. For example, pairing a 10-tooth pinion with a 30-tooth gear gives a 3:1 reduction. A larger tooth count also increases the pitch diameter, which can help distribute load over more teeth for heavier-duty drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does Module 5 (Mod 5) mean, and will it mesh with my existing gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModule is the ratio of pitch diameter to tooth count. A Mod 5 gear has a pitch diameter of 5 mm per tooth — so a 20-tooth Mod 5 gear has a 100 mm pitch diameter. These gears will mesh correctly with any other metric Mod 5 spur gear or rack that uses a standard 20° pressure angle. Always verify both the module and pressure angle match before pairing gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel offers a tensile strength typically in the range of 600–750 MPa, making it well-suited for moderate-to-heavy mechanical drives. Actual load capacity depends on tooth count, face width, rotational speed, and lubrication. For high-cycle or shock-load applications, consider adding a lubricant to the mesh contact zone to extend service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel is not inherently corrosion resistant. For indoor or dry environments, the bare steel surface is adequate with periodic light lubrication. For humid or outdoor environments, applying a rust-inhibiting grease or coating to the gear teeth and bore is recommended to prevent surface oxidation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as a rack-and-pinion drive for linear motion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pinion gears are commonly paired with a Mod 5 gear rack for linear CNC axis drives, motorized gates, and sliding mechanisms. Ensure the rack also uses Module 5 with a 20° pressure angle. The pinion is mounted on the motor shaft and rolls along the rack to convert rotary motion into linear displacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size and keyway options are available?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter and keyway dimensions vary by tooth count and gear size. Please refer to the variant options or contact us to confirm the bore size for your selected tooth count before ordering, especially if you need to match a specific motor shaft diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine which tooth count gives me the pitch diameter I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse the formula: Pitch Diameter (mm) = Module × Tooth Count. For Mod 5 gears, simply multiply 5 by your chosen tooth count. For example, 5 × 25 = 125 mm pitch diameter. This makes it straightforward to calculate center distances and gear ratios for your drive layout.\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 (Size) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"5 Mod, 10 Teeth","offer_id":52443068956946,"sku":"GLFBBYWGLBZSJ058301x1","price":103.22,"currency_code":"USD","in_stock":true},{"title":"5 Mod, 11 Teeth","offer_id":52443068989714,"sku":"GLFBBYWGLBZSJ058302x1","price":113.4,"currency_code":"USD","in_stock":true},{"title":"5 Mod, 12 Teeth","offer_id":52443069022482,"sku":"GLFBBYWGLBZSJ058303x1","price":123.3,"currency_code":"USD","in_stock":true},{"title":"5 Mod, 13 Teeth","offer_id":52443069055250,"sku":"GLFBBYWGLBZSJ058304x1","price":133.09,"currency_code":"USD","in_stock":true},{"title":"5 Mod, 14 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