{"product_id":"0-5-mod-24-teeth-pinion-spur-gear-bore-4-5-6mm-id-13mm-black-oxide-steel","title":"0.5 Mod 24 Teeth Pinion Spur Gear Bore 4\/5\/6mm ID 13mm Black Oxide Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e0.5 Mod 24-Tooth Pinion Spur Gear — Precision Black Oxide Steel for Compact Drive Systems\u003c\/h2\u003e\n    \u003cp\u003eWhen a stripped or undersized gear stalls your build, every millimeter of bore tolerance matters. Makers, robotics engineers, and RC hobbyists working with compact 0.5-module drive trains need a pinion gear that fits precisely, transmits torque cleanly, and resists wear over thousands of cycles — without corroding in mixed-environment use.\u003c\/p\u003e\n    \u003cp\u003eThis 0.5 Mod 24-tooth spur gear is machined from steel with a black oxide surface treatment. The outer diameter measures 13mm (approx. 0.51 in), and bore options of 4mm, 5mm, and 6mm (approx. 0.157–0.236 in) cover the most common motor shaft sizes in this module class. Tooth count is fixed at 24T with a 0.5 module pitch, giving a pitch diameter of 12mm (0.472 in).\u003c\/p\u003e\n    \u003cp\u003eTypical applications include RC car pinion-to-spur mesh assemblies, small robotic joint actuators requiring a 0.5-module gear ratio stage, and compact automation mechanisms where a 13mm OD steel spur gear with a defined bore is required for shaft-to-gear coupling without set screws.\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    Compatible with 0.5 module spur and pinion gear systems — verify bore diameter matches your motor or drive shaft before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 0.5 Mod 24T Pinion Spur Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eThree Bore Options\u003c\/strong\u003e\n        \u003cp\u003eAvailable in 4mm, 5mm, and 6mm bore diameters to match common motor shaft sizes in 0.5-module drive systems — select your exact bore above.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚫\u003c\/span\u003e\n        \u003cstrong\u003eBlack Oxide Steel Construction\u003c\/strong\u003e\n        \u003cp\u003eSteel body with black oxide finish provides corrosion resistance and reduces surface friction compared to bare steel, extending service life in mixed-humidity environments.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003ePrecise 0.5 Module, 24-Tooth Profile\u003c\/strong\u003e\n        \u003cp\u003eMachined to 0.5 module standard with 24 teeth, yielding a 12mm pitch diameter and 13mm outer diameter — dimensionally consistent for repeatable gear mesh.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eSmooth Torque Transmission\u003c\/strong\u003e\n        \u003cp\u003eUniform tooth spacing and steel rigidity support consistent torque transfer in high-cycle applications such as robotics joints and RC drivetrain assemblies.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n        \u003cp\u003eAvailable in 1, 3, 5, or 10-piece quantities — order a single replacement or stock multiples for prototyping, repair kits, or production runs.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e\n        \u003cp\u003e13mm OD and standard 0.5-module tooth form make this gear a direct dimensional replacement for worn pinion gears in compatible 0.5-module gear trains.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — 0.5 Mod Pinion Spur Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e24T\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Diameter\u003c\/th\u003e\n\u003ctd\u003e12mm (0.472 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e13mm (0.512 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4mm \/ 5mm \/ 6mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpur Gear (Pinion)\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\u003eHub \/ Face Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 10 pcs (See 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 — 4mm, 5mm, or 6mm?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the outer diameter of your motor or drive shaft with calipers. The bore must match your shaft diameter exactly for a secure fit. A 4mm bore suits most small DC and stepper motor shafts in micro robotics; 5mm and 6mm are common in larger RC car motors and servo-driven mechanisms. If your shaft uses a set screw or keyway, confirm the hub depth accommodates it.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the pressure angle of this gear, and does it matter for meshing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis gear uses the standard 20° pressure angle. For proper meshing, both the pinion and the mating spur gear must share the same module (0.5) and pressure angle (20°). Mixing pressure angles — even at the same module — will cause poor tooth contact, noise, and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs black oxide a strong corrosion barrier for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides mild corrosion resistance and reduces surface friction, but it is not equivalent to zinc plating or stainless steel for prolonged outdoor or wet exposure. For occasional humidity or indoor use it performs well. In continuously wet or salt-spray environments, consider applying a light machine oil to the gear surface periodically to maintain protection.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with plastic spur gears of the same module?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any 0.5-module, 20° pressure angle spur gear will mesh with this steel pinion regardless of material, provided the center distance is set correctly. Steel-on-plastic pairings are common in RC and robotics applications where the plastic gear acts as the sacrificial wear component, protecting the motor shaft from shock loads.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the correct center distance when pairing this gear with another spur gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCenter distance = (Pinion pitch diameter + Mating gear pitch diameter) ÷ 2. For this 24T gear, pitch diameter = 12mm. If your mating gear is, for example, a 0.5 Mod 48T gear (pitch diameter 24mm), center distance = (12 + 24) ÷ 2 = 18mm. Always verify with calipers after assembly to ensure smooth, backlash-controlled mesh.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these gears in a multi-stage gear reduction system?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This 0.5 Mod 24T pinion is well-suited as the input stage in a multi-stage reduction, driving a larger spur gear on an intermediate shaft. Ensure each stage uses matched 0.5-module gears and that shaft alignment is maintained across stages to prevent binding and uneven tooth load.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat quantity should I order for a prototype vs. a production run?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor initial prototyping or a single build, the 1-piece option lets you validate fit and mesh before committing. The 3-piece or 5-piece packs are practical for iterative testing or small batch builds. The 10-piece pack offers the best per-unit value for production runs, repair stock, or team builds where multiple assemblies share the same gear specification.\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 Gear Size (bore diameter) and quantity 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 — 4mm, 5mm, or 6mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of your motor or drive shaft with calipers. The bore must match your shaft diameter exactly for a secure fit. A 4mm bore suits most small DC and stepper motor shafts in micro robotics; 5mm and 6mm are common in larger RC car motors and servo-driven mechanisms.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the pressure angle of this gear, and does it matter for meshing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This gear uses the standard 20° pressure angle. For proper meshing, both the pinion and the mating spur gear must share the same module (0.5) and pressure angle (20°). Mixing pressure angles will cause poor tooth contact, noise, and accelerated wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is black oxide a strong corrosion barrier for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides mild corrosion resistance and reduces surface friction, but is not equivalent to zinc plating or stainless steel for prolonged outdoor or wet exposure. Apply a light machine oil periodically in continuously wet environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this gear mesh with plastic spur gears of the same module?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — any 0.5-module, 20° pressure angle spur gear will mesh with this steel pinion regardless of material, provided the center distance is set correctly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the correct center distance when pairing this gear with another spur gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Center distance = (Pinion pitch diameter + Mating gear pitch diameter) ÷ 2. For this 24T gear, pitch diameter = 12mm. Example: pairing with a 48T gear (PD 24mm) gives a center distance of 18mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these gears in a multi-stage gear reduction system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. This 0.5 Mod 24T pinion is well-suited as the input stage in a multi-stage reduction. Ensure each stage uses matched 0.5-module gears and that shaft alignment is maintained across stages.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What quantity should I order for a prototype vs. a production run?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For prototyping, the 1-piece option lets you validate fit before committing. The 3 or 5-piece packs suit iterative testing. The 10-piece pack offers the best per-unit value for production runs or repair stock.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.5Mod 24T Bore 4mm \/ 1pcs","offer_id":52441948553490,"sku":"GLFBNHHGLCDPJ00034x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 5mm \/ 1pcs","offer_id":52441948586258,"sku":"GLFBNHHGLCDPJ00035x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 6mm \/ 1pcs","offer_id":52441948619026,"sku":"GLFBNHHGLCDPJ00036x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 4mm \/ 3pcs","offer_id":52441948651794,"sku":"GLFBNHHGLCDPJ00034x3","price":15.98,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 5mm \/ 3pcs","offer_id":52441948684562,"sku":"GLFBNHHGLCDPJ00035x3","price":15.98,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 6mm \/ 3pcs","offer_id":52441948717330,"sku":"GLFBNHHGLCDPJ00036x3","price":15.98,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 4mm \/ 5pcs","offer_id":52441948750098,"sku":"GLFBNHHGLCDPJ00034x5","price":25.91,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 5mm \/ 5pcs","offer_id":52441948782866,"sku":"GLFBNHHGLCDPJ00035x5","price":25.91,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 6mm \/ 5pcs","offer_id":52441948815634,"sku":"GLFBNHHGLCDPJ00036x5","price":25.91,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 4mm \/ 10pcs","offer_id":52441948848402,"sku":"GLFBNHHGLCDPJ00034x10","price":50.58,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 5mm \/ 10pcs","offer_id":52441948881170,"sku":"GLFBNHHGLCDPJ00035x10","price":50.58,"currency_code":"USD","in_stock":true},{"title":"0.5Mod 24T Bore 6mm \/ 10pcs","offer_id":52441948913938,"sku":"GLFBNHHGLCDPJ00036x10","price":50.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of9_ff69c5e3-11c9-48a0-85b7-6e43017f2539.jpg?v=1783585346","url":"https:\/\/homediyer.com\/products\/0-5-mod-24-teeth-pinion-spur-gear-bore-4-5-6mm-id-13mm-black-oxide-steel","provider":"HomeDIYer","version":"1.0","type":"link"}