{"product_id":"0-5m-38t-spur-gears-steel-pinion-gears-metal-transmission-gear","title":"0.5M 38T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e0.5M 38T Steel Spur Gears — Reliable Metal Pinion for Precision Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping plastic gear or an undersized pinion brings your build to a halt, you need a drop-in metal replacement that holds torque without play. Makers, robotics builders, RC hobbyists, and small-machine engineers rely on a consistent, accurately cut spur gear to keep their drive trains running true.\u003c\/p\u003e\n\u003cp\u003eThese 0.5M 38T spur gears are machined from 45# carbon steel, delivering solid rigidity and wear resistance in a compact form factor. The module is 0.5 (metric), tooth count is 38T, and bore options span 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in) to suit a range of shaft diameters. Outer diameter is approximately 19.5 mm (~0.768 in) at this tooth count and module.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY robotic arm joints requiring low-backlash 0.5 module spur gear sets, RC car and truck transmission rebuilds needing steel pinion gear replacements, and compact automation or conveyor mechanisms where metal spur transmission gears outlast plastic alternatives.\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 any 0.5 module gear system. Mates with other 0.5M spur, rack, or pinion gears. Bore must match your shaft diameter — select 6 mm, 8 mm, or 10 mm above.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 0.5M 38T Steel Spur Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from 45# carbon steel for dependable hardness and fatigue resistance under repeated load cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e0.5 Module, 38 Teeth\u003c\/strong\u003e\n\u003cp\u003eStandard metric 0.5M pitch ensures direct interchangeability with any other 0.5 module gear in your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eThree Bore Options\u003c\/strong\u003e\n\u003cp\u003eAvailable with 6 mm, 8 mm, or 10 mm center bore to match common motor and shaft diameters without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eOrder 1 to 50 pieces per pack — ideal for prototyping single units or stocking spares for production runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eLow Backlash Tooth Profile\u003c\/strong\u003e\n\u003cp\u003ePrecision-cut involute tooth form minimizes backlash and noise, supporting smooth, consistent power transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eWide Application Range\u003c\/strong\u003e\n\u003cp\u003eSuited for robotics, RC vehicles, 3D printer extruder drives, small conveyor systems, and DIY automation projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 0.5M Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5M (metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e38T\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 (OD)\u003c\/th\u003e\n\u003ctd\u003eApprox. 19.5 mm (~0.768 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# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel (uncoated)\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\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eExternal Spur Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 10 \/ 15 \/ 20 \/ 30 \/ 50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\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 bore size for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with calipers. Select the bore that matches: 6 mm for small hobby motors, 8 mm for mid-range DC or stepper motors, and 10 mm for larger shafts. The bore should be a snug fit — use a set screw or keyway to secure the gear on the shaft.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears mesh with my existing 0.5 module gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Any two gears with the same module (0.5M) and pressure angle (20°) will mesh correctly regardless of tooth count. These 38T gears will pair with any other 0.5M spur, rack, or pinion gear in your system.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these steel spur gears compared to plastic ones?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel has significantly higher tensile strength and hardness than common engineering plastics such as POM or nylon. For applications with moderate-to-high torque, repeated load cycles, or elevated temperatures, steel gears provide far greater durability and dimensional stability.\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\u003e45# carbon steel is not inherently stainless. For indoor or dry environments, the natural steel finish is adequate. For humid or outdoor applications, apply a light machine oil or anti-rust coating after installation to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the gear ratio I can achieve with a 38T spur gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGear ratio depends on the tooth count of the mating pinion. For example, pairing a 38T gear with a 19T pinion gives a 2:1 reduction ratio. Pair with different tooth counts to achieve your target speed or torque multiplication.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in a 3D printer extruder or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 0.5M spur gears are commonly used in compact extruder drives, axis transmission systems, and small CNC routing heads. Verify that your existing gear train uses 0.5 module and that the bore matches your motor shaft before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhy should I order a multi-pack instead of single pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMulti-packs (3, 5, 10, 20, 30, or 50 pcs) reduce per-unit cost and ensure you have spares on hand for repairs or batch builds. For production runs or classroom robotics kits, bulk packs offer the best value per gear.\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 Teeth - Bore(mm) and Qty(pcs) 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 shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with calipers. Select the bore that matches: 6 mm for small hobby motors, 8 mm for mid-range DC or stepper motors, and 10 mm for larger shafts. The bore should be a snug fit — use a set screw or keyway to secure the gear on the shaft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears mesh with my existing 0.5 module gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Any two gears with the same module (0.5M) and pressure angle (20°) will mesh correctly regardless of tooth count. These 38T gears will pair with any other 0.5M spur, rack, or pinion gear in your system.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these steel spur gears compared to plastic ones?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel has significantly higher tensile strength and hardness than common engineering plastics such as POM or nylon. For applications with moderate-to-high torque, repeated load cycles, or elevated temperatures, steel gears provide far greater durability and dimensional stability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears corrosion resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45# carbon steel is not inherently stainless. For indoor or dry environments, the natural steel finish is adequate. For humid or outdoor applications, apply a light machine oil or anti-rust coating after installation to extend service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the gear ratio I can achieve with a 38T spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Gear ratio depends on the tooth count of the mating pinion. For example, pairing a 38T gear with a 19T pinion gives a 2:1 reduction ratio. Pair with different tooth counts to achieve your target speed or torque multiplication.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these in a 3D printer extruder or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 0.5M spur gears are commonly used in compact extruder drives, axis transmission systems, and small CNC routing heads. Verify that your existing gear train uses 0.5 module and that the bore matches your motor shaft before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why should I order a multi-pack instead of single pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Multi-packs (3, 5, 10, 20, 30, or 50 pcs) reduce per-unit cost and ensure you have spares on hand for repairs or batch builds. For production runs or classroom robotics kits, bulk packs offer the best value per gear.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"38T-6mm \/ 1","offer_id":52443365933330,"sku":"GLFBMWXGLCDPJ00064x1","price":4.31,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 3","offer_id":52443365966098,"sku":"GLFBMWXGLCDPJ00064x3","price":10.74,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 5","offer_id":52443365998866,"sku":"GLFBMWXGLCDPJ00064x5","price":17.49,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 10","offer_id":52443366031634,"sku":"GLFBMWXGLCDPJ00064x10","price":34.37,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 15","offer_id":52443366064402,"sku":"GLFBMWXGLCDPJ00064x15","price":51.23,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 20","offer_id":52443366097170,"sku":"GLFBMWXGLCDPJ00064x20","price":68.11,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 30","offer_id":52443366129938,"sku":"GLFBMWXGLCDPJ00064x30","price":101.85,"currency_code":"USD","in_stock":true},{"title":"38T-6mm \/ 50","offer_id":52443366162706,"sku":"GLFBMWXGLCDPJ00064x50","price":169.35,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 1","offer_id":52443366195474,"sku":"GLFBMWXGLCDPJ00065x1","price":4.31,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 3","offer_id":52443366228242,"sku":"GLFBMWXGLCDPJ00065x3","price":10.74,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 5","offer_id":52443366261010,"sku":"GLFBMWXGLCDPJ00065x5","price":17.49,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 10","offer_id":52443366293778,"sku":"GLFBMWXGLCDPJ00065x10","price":34.37,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 15","offer_id":52443366326546,"sku":"GLFBMWXGLCDPJ00065x15","price":51.23,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 20","offer_id":52443366359314,"sku":"GLFBMWXGLCDPJ00065x20","price":68.11,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 30","offer_id":52443366392082,"sku":"GLFBMWXGLCDPJ00065x30","price":101.85,"currency_code":"USD","in_stock":true},{"title":"38T-8mm \/ 50","offer_id":52443366424850,"sku":"GLFBMWXGLCDPJ00065x50","price":169.35,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 1","offer_id":52443366457618,"sku":"GLFBMWXGLCDPJ00066x1","price":4.31,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 3","offer_id":52443366490386,"sku":"GLFBMWXGLCDPJ00066x3","price":10.74,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 5","offer_id":52443366523154,"sku":"GLFBMWXGLCDPJ00066x5","price":17.49,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 10","offer_id":52443366555922,"sku":"GLFBMWXGLCDPJ00066x10","price":34.37,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 15","offer_id":52443366588690,"sku":"GLFBMWXGLCDPJ00066x15","price":51.23,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 20","offer_id":52443366621458,"sku":"GLFBMWXGLCDPJ00066x20","price":68.11,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 30","offer_id":52443366654226,"sku":"GLFBMWXGLCDPJ00066x30","price":101.85,"currency_code":"USD","in_stock":true},{"title":"38T-10mm \/ 50","offer_id":52443366686994,"sku":"GLFBMWXGLCDPJ00066x50","price":169.35,"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\/0-5m-38t-spur-gears-steel-pinion-gears-metal-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}