{"product_id":"0-5-mod-44t-spur-gears-steel-pinion-gears-metal-spur-transmission-gear-45-steel","title":"0.5 Mod 44T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5 Mod Steel Spur Gears — Precision Pinion Gears for Compact Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your RC car, robotic arm, or DIY gearbox demands tight tolerances and reliable torque transfer, undersized or plastic gears become the weakest link in the chain. Makers, hobbyists, and small-shop engineers who need repeatable, metal-on-metal mesh in confined spaces rely on module 0.5 spur gears that hold their geometry under load.\u003c\/p\u003e\n\u003cp\u003eThese 0.5 Mod spur gears are machined from 45 steel — a medium-carbon steel known for its balance of hardness and machinability. Available in 44-tooth (44T) and 42-tooth (42T) configurations with bore diameters of 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in), the gears suit shafts in the most common small-motor and servo ranges. Outer diameter for 44T is approximately 23 mm (~0.906 in); for 42T approximately 22 mm (~0.866 in), based on standard 0.5 module geometry.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include RC vehicle transmission rebuilds requiring a 0.5 mod pinion gear replacement, desktop robotic arm joint drives needing a compact metal spur gear set, and DIY encoder or stepper-motor gearbox projects where a 45-steel transmission gear ensures long service life.\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 0.5 (Mod 0.5) gear systems. Mates with any standard 0.5 module rack, pinion, or mating spur gear. Verify bore diameter matches your shaft before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 0.5 Mod Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e45 Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMedium-carbon 45 steel delivers a tensile strength of approximately 600–800 MPa, resisting deformation under repeated meshing loads far better than plastic or zinc-alloy alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eStandard 0.5 Module Geometry\u003c\/strong\u003e\n\u003cp\u003eMachined to Module 0.5 (m = 0.5 mm) with a 20° pressure angle, ensuring drop-in compatibility with any standard Mod 0.5 mating gear, rack, or pinion in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eMultiple Bore Options\u003c\/strong\u003e\n\u003cp\u003eChoose from 6 mm, 8 mm, or 10 mm bore diameters to match your motor shaft or output shaft without secondary machining in most common small-drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eLow Backlash Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eInvolute tooth form with consistent pitch circle diameter minimizes backlash and noise, critical for position-sensitive robotics and servo-driven mechanisms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Quantity Packs\u003c\/strong\u003e\n\u003cp\u003eOrder 1 to 50 pieces per SKU — ideal for prototyping single units or stocking spares for production runs, with per-unit cost decreasing at higher quantities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eReady-to-Install Design\u003c\/strong\u003e\n\u003cp\u003eFinished bore and face require no additional turning for standard shaft fits. Simply press or key onto your shaft and mesh with a compatible 0.5 mod counterpart.\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 — 0.5 Mod Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5 mm\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\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e44T or 42T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (44T)\u003c\/th\u003e\n\u003ctd\u003e~23 mm (~0.906 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (42T)\u003c\/th\u003e\n\u003ctd\u003e~22 mm (~0.866 in)\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45 Steel (medium-carbon steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal spur gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Form\u003c\/th\u003e\n\u003ctd\u003eInvolute\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 15 \/ 20 \/ 30 \/ 40 \/ 50 pcs\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 between 44T and 42T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your gear ratio. A 44T gear paired with a smaller pinion gives a higher reduction ratio than a 42T in the same pairing. If you need a slightly faster output speed, choose 42T; for more torque reduction, choose 44T. Both are Module 0.5, so they mesh with the same mating gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\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\n\u003cp\u003eMeasure your motor or servo output shaft diameter precisely. Choose 6 mm bore for shafts up to 6 mm, 8 mm for shafts up to 8 mm, and 10 mm for shafts up to 10 mm. If your shaft is slightly undersized, a set screw or key can secure the gear. Contact us to confirm if you are unsure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears compatible with plastic 0.5 mod gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — Module 0.5 is a standardized metric gear specification. These steel spur gears will mesh correctly with any mating gear (plastic, brass, or steel) that is also Module 0.5 with a 20° pressure angle. However, pairing steel with soft plastic may accelerate wear on the plastic gear over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are 45 steel spur gears compared to brass or aluminum?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45 steel has a tensile strength of approximately 600–800 MPa, significantly higher than brass (~350–500 MPa) and aluminum alloys (~200–400 MPa). For high-cycle or high-torque applications — such as RC drivetrains or robotic joints — 45 steel provides superior fatigue resistance and longer service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these gears resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45 steel has moderate corrosion resistance. For indoor or dry environments, the gears perform well without additional treatment. For humid or outdoor applications, applying a light machine oil or grease to the tooth faces will protect against surface oxidation and extend service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I order a mix of tooth counts and bore sizes in one order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach variant (Teeth–Bore combination) is listed separately. Add each variant you need to your cart individually and select the desired quantity pack for each. This lets you build a custom assortment of 44T-6mm, 44T-8mm, and 42T-10mm gears in a single order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat quantity pack is most cost-effective for prototyping?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor initial prototyping, the 1-piece or 5-piece pack lets you validate fit and mesh before committing to larger quantities. Once your design is confirmed, the 20–50 piece packs offer a lower per-unit cost and ensure you have spares on hand for production or repair runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Teeth–Bore combination and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"44T-6mm \/ 1","offer_id":52443374485778,"sku":"GLFBMWXGLCDPJ00077x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 5","offer_id":52443374518546,"sku":"GLFBMWXGLCDPJ00077x5","price":20.92,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 10","offer_id":52443374551314,"sku":"GLFBMWXGLCDPJ00077x10","price":41.22,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 15","offer_id":52443374584082,"sku":"GLFBMWXGLCDPJ00077x15","price":61.53,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 20","offer_id":52443374616850,"sku":"GLFBMWXGLCDPJ00077x20","price":81.82,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 30","offer_id":52443374649618,"sku":"GLFBMWXGLCDPJ00077x30","price":122.43,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 40","offer_id":52443374682386,"sku":"GLFBMWXGLCDPJ00077x40","price":163.02,"currency_code":"USD","in_stock":true},{"title":"44T-6mm \/ 50","offer_id":52443374715154,"sku":"GLFBMWXGLCDPJ00077x50","price":203.63,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 1","offer_id":52443374747922,"sku":"GLFBMWXGLCDPJ00078x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 5","offer_id":52443374780690,"sku":"GLFBMWXGLCDPJ00078x5","price":20.92,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 10","offer_id":52443374813458,"sku":"GLFBMWXGLCDPJ00078x10","price":41.22,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 15","offer_id":52443374846226,"sku":"GLFBMWXGLCDPJ00078x15","price":61.53,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 20","offer_id":52443374878994,"sku":"GLFBMWXGLCDPJ00078x20","price":81.82,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 30","offer_id":52443374911762,"sku":"GLFBMWXGLCDPJ00078x30","price":122.43,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 40","offer_id":52443374944530,"sku":"GLFBMWXGLCDPJ00078x40","price":163.02,"currency_code":"USD","in_stock":true},{"title":"44T-8mm \/ 50","offer_id":52443374977298,"sku":"GLFBMWXGLCDPJ00078x50","price":203.63,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 1","offer_id":52443375010066,"sku":"GLFBMWXGLCDPJ00079x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 5","offer_id":52443375042834,"sku":"GLFBMWXGLCDPJ00079x5","price":20.92,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 10","offer_id":52443375075602,"sku":"GLFBMWXGLCDPJ00079x10","price":41.22,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 15","offer_id":52443375108370,"sku":"GLFBMWXGLCDPJ00079x15","price":61.53,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 20","offer_id":52443375141138,"sku":"GLFBMWXGLCDPJ00079x20","price":81.82,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 30","offer_id":52443375173906,"sku":"GLFBMWXGLCDPJ00079x30","price":122.43,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 40","offer_id":52443375206674,"sku":"GLFBMWXGLCDPJ00079x40","price":163.02,"currency_code":"USD","in_stock":true},{"title":"42T-10mm \/ 50","offer_id":52443375239442,"sku":"GLFBMWXGLCDPJ00079x50","price":203.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture_1_of_7_1.jpg?v=1784113081","url":"https:\/\/homediyer.com\/products\/0-5-mod-44t-spur-gears-steel-pinion-gears-metal-spur-transmission-gear-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}