{"product_id":"05m-25-28t-spur-gears-45-steel-pinion-transmission-gear","title":"0.5M 25-28T 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 Steel Spur Gears — Precision 45 Steel Pinion Gears for Compact Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a stripped plastic gear or an undersized pinion brings your build to a halt, you need a drop-in metal replacement that holds its pitch under load. These 0.5 module spur gears are designed for makers, RC hobbyists, and small-machine builders who demand consistent tooth engagement and reliable torque transfer in tight spaces.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45 steel (medium carbon steel), offering a good balance of hardness and machinability. The module is 0.5M — meaning a tooth pitch of approximately 1.571 mm (0.062 in) — with tooth counts of 25T, 26T, or 28T and bore diameters of 4 mm (0.157 in), 5 mm (0.197 in), or 6 mm (0.236 in). Overall gear outer diameters range from approximately 13.5 mm to 15 mm (0.53–0.59 in) depending on tooth count.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include 0.5M spur gear replacement for RC car gearboxes, small robot joint drives requiring a 25T–28T steel pinion gear, and DIY automation projects needing a compact metal spur transmission gear with a 4–6 mm shaft bore.\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 (0.5M) gear system. Mates with other 0.5M spur, rack, or pinion components sharing the same module and pressure angle (typically 20°). Verify bore diameter matches your shaft before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 0.5M Steel Spur Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45 Steel Construction\u003c\/strong\u003e — Medium carbon steel provides solid surface hardness and wear resistance for sustained mesh under moderate loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e0.5 Module Precision\u003c\/strong\u003e — Standard 0.5M tooth profile ensures accurate pitch-circle engagement and smooth, low-noise rotation when paired with matching 0.5M components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eThree Tooth Count Options\u003c\/strong\u003e — Choose 25T, 26T, or 28T to dial in your gear ratio without redesigning your drivetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes\u003c\/strong\u003e — Available in 4 mm, 5 mm, and 6 mm bore to fit common motor and shaft diameters used in RC and robotics applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Packs\u003c\/strong\u003e — Order 1, 5, 10, 20, 30, 40, or 50 pieces to match your project scale or stock your workshop for future repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eConsistent Machined Tolerances\u003c\/strong\u003e — Uniform tooth geometry across the batch ensures interchangeability and repeatable assembly in multi-gear drive trains.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 0.5M Steel Spur Gears\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e25T \/ 26T \/ 28T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Options\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003e13.5 mm – 15 mm (0.53–0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard)\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\u003eHub Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 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\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 tooth count — 25T, 26T, or 28T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your gear ratio. A smaller pinion (25T) paired with a larger driven gear gives more torque reduction; a larger pinion (28T) gives a higher output speed for the same driven gear. Calculate your target ratio by dividing the driven gear's tooth count by the pinion tooth count, then select the option that gets you closest to your design goal.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I order for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your motor or drive shaft diameter with calipers. These gears are available in 4 mm, 5 mm, and 6 mm bore. For a secure fit, the bore should match the shaft diameter exactly; you can then use a set screw, adhesive, or press fit depending on your application. If your shaft is between sizes, choose the next size up and use a shaft collar or sleeve.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for RC car drivetrains?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 45 steel offers significantly higher shear strength than the nylon or plastic pinions commonly found in entry-level RC vehicles. They are well-suited for 1:10 to 1:18 scale RC cars, small robot joints, and light industrial automation where moderate torque and continuous rotation are required. For very high-shock or high-RPM applications, consider whether additional surface hardening is needed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears rust or corrode over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45 steel is not stainless and will oxidize if exposed to moisture without protection. For indoor or dry-environment use, a light coat of machine oil or grease on the tooth faces is sufficient. For outdoor or humid environments, apply a corrosion-inhibiting grease regularly, or consider a stainless steel alternative if long-term corrosion resistance is a priority.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat other gears are compatible with these 0.5M spur gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAny gear with a matching 0.5 module and the same pressure angle (20°) will mesh correctly — including other 0.5M spur gears, 0.5M racks, and 0.5M pinions regardless of material. Module and pressure angle must both match; tooth count only affects the gear ratio, not compatibility.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces should I order for a typical project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a single-axis drive with one pinion and one driven gear, a quantity of 1 or 2 is sufficient. For multi-axis robots or production runs, the 10–50 piece packs offer better per-unit value. Workshop builders who perform regular maintenance often stock the 20–30 piece packs to have spares on hand without over-ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears with a 0.5M rack for linear motion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. A 0.5M spur gear meshes directly with a 0.5M rack of the same pressure angle, making these pinion gears suitable for rack-and-pinion linear actuators in small CNC machines, camera sliders, or drawer mechanisms. Ensure the rack's tooth profile and pressure angle match before assembly.\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 count, 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 tooth count — 25T, 26T, or 28T?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines your gear ratio. A smaller pinion (25T) paired with a larger driven gear gives more torque reduction; a larger pinion (28T) gives a higher output speed for the same driven gear. Calculate your target ratio by dividing the driven gear's tooth count by the pinion tooth count, then select the option that gets you closest to your design goal.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I order for my motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your motor or drive shaft diameter with calipers. These gears are available in 4 mm, 5 mm, and 6 mm bore. For a secure fit, the bore should match the shaft diameter exactly; you can then use a set screw, adhesive, or press fit depending on your application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these gears strong enough for RC car drivetrains?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 45 steel offers significantly higher shear strength than nylon or plastic pinions. They are well-suited for 1:10 to 1:18 scale RC cars, small robot joints, and light industrial automation where moderate torque and continuous rotation are required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these gears rust or corrode over time?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"45 steel is not stainless and will oxidize if exposed to moisture without protection. For indoor use, a light coat of machine oil or grease on the tooth faces is sufficient. For outdoor or humid environments, apply a corrosion-inhibiting grease regularly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What other gears are compatible with these 0.5M spur gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Any gear with a matching 0.5 module and the same pressure angle (20°) will mesh correctly — including other 0.5M spur gears, 0.5M racks, and 0.5M pinions regardless of material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for a typical project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a single-axis drive, a quantity of 1 or 2 is sufficient. For multi-axis robots or production runs, the 10–50 piece packs offer better per-unit value. Workshop builders often stock the 20–30 piece packs to have spares on hand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears with a 0.5M rack for linear motion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A 0.5M spur gear meshes directly with a 0.5M rack of the same pressure angle, making these pinion gears suitable for rack-and-pinion linear actuators in small CNC machines, camera sliders, or drawer mechanisms.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"25T \/ 4mm \/ 1","offer_id":52443368489234,"sku":"GLFBMWXGLCDPJ00037x1","price":3.93,"currency_code":"USD","in_stock":true},{"title":"25T \/ 4mm \/ 5","offer_id":52443368522002,"sku":"GLFBMWXGLCDPJ00037x5","price":14.67,"currency_code":"USD","in_stock":true},{"title":"25T \/ 4mm \/ 10","offer_id":52443368554770,"sku":"GLFBMWXGLCDPJ00037x10","price":28.72,"currency_code":"USD","in_stock":true},{"title":"25T \/ 4mm \/ 20","offer_id":52443368587538,"sku":"GLFBMWXGLCDPJ00037x20","price":56.83,"currency_code":"USD","in_stock":true},{"title":"25T \/ 4mm \/ 30","offer_id":52443368620306,"sku":"GLFBMWXGLCDPJ00037x30","price":84.95,"currency_code":"USD","in_stock":true},{"title":"25T \/ 4mm \/ 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