{"product_id":"2-5-mod-spur-gear-10t-40t-flat-gear-45-steel-transmission-gears-od-30-105mm","title":"2.5 Mod Spur Gear 10T - 40T Flat Gear 45 Steel Transmission Gears OD 30-105mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e2.5 Module Spur Gear — Precision 45 Steel Flat Gear for Reliable Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your drive system demands consistent torque transfer and dimensional accuracy, undersized or poorly machined gears become the weakest link. Engineers, robotics builders, and DIY machine makers who need a dependable 2.5 module spur gear will find this range covers the most common tooth counts in a single catalog entry.\u003c\/p\u003e\n\u003cp\u003eThese flat spur gears are machined from 45 carbon steel and are available in tooth counts from 10T to 40T, with corresponding outer diameters ranging from 30mm to 105mm (approximately 1.18 in to 4.13 in). The module is 2.5, giving a consistent pitch that mates with any standard 2.5 Mod gear or rack.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include custom CNC router axis drives, open-frame 3D printer extruder gearboxes, small-batch conveyor reduction stages, and educational robotics platforms requiring a 2.5 mod spur gear with a defined OD for chassis clearance calculations.\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 standard \u003cstrong\u003eModule 2.5\u003c\/strong\u003e gear, rack, or pinion. Verify bore diameter and keyway requirements before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 2.5 Mod 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 Carbon Steel Construction\u003c\/strong\u003e — Machined from 45 steel for solid hardness and wear resistance in continuous-duty transmission applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth Range: 10T – 40T\u003c\/strong\u003e — Covers OD 30mm to 105mm (1.18\"–4.13\") in a single product family, reducing sourcing complexity for multi-stage gearboxes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eStandard 2.5 Module Pitch\u003c\/strong\u003e — Fully interchangeable with any Module 2.5 mating gear, rack, or pinion; no custom tooling required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eFlat Gear Profile\u003c\/strong\u003e — Uniform face width across the tooth range suits parallel-shaft drive layouts in robotics frames, CNC gantries, and conveyor drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eMulti-Pack Quantity Options\u003c\/strong\u003e — Available in 1–5 piece packs per variant, allowing you to order spares or matched gear pairs in a single transaction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eConsistent Dimensional Accuracy\u003c\/strong\u003e — Tooth profile and OD tolerance maintained across the full 10T–40T range for predictable center-distance calculations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 2.5 Module Spur Gear\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10T – 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e30mm – 105mm (1.18\" – 4.13\")\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)\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\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eKeyway\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\u003eAvailable Quantities\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 pcs per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\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\u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the tooth count based on your required gear ratio and available center distance. For a 2.5 module gear pair, the center distance equals (T1 + T2) x 2.5 \/ 2. Use a smaller tooth count (10T–15T) as the pinion and a larger count (20T–40T) as the driven gear to achieve speed reduction.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the pressure angle of these spur gears?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese gears use the standard 20° pressure angle, the most widely adopted profile for industrial and hobbyist spur gears. They will mesh correctly with any other Module 2.5, 20° pressure angle gear or rack.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these gears suitable for outdoor or corrosive environments?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45 carbon steel has moderate corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease coating, or consider a surface treatment such as black oxide or zinc plating after purchase. For highly corrosive conditions, a stainless steel gear may be more appropriate.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill these gears mesh with a Module 2.5 rack or worm gear?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, these spur gears are fully compatible with any standard Module 2.5 rack. They are not designed to mesh with worm gears, which require a matched worm wheel with a specific lead angle. For rack-and-pinion linear motion systems, any tooth count in this range will work as long as the rack is also Module 2.5.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I verify the bore diameter before ordering?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter varies by tooth count and is listed in the variant details or product images. If you need a specific bore size to fit a shaft, check the variant specifications or contact us to confirm before placing your order. Custom bore machining is not included.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat load capacity can these gears handle?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on tooth count, face width, operating speed, and lubrication. 45 carbon steel spur gears in this module range are suitable for light-to-medium duty applications such as robotics, small CNC machines, and educational equipment. For heavy industrial loads or high-cycle fatigue applications, consult a gear engineer to verify the design.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I order a matched gear pair in one transaction?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each variant is sold independently by tooth count and quantity. Add the desired tooth count variants to your cart separately to build a matched pair or multi-stage gear set in a single order.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Teeth-OD and QTY above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right tooth count for my application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Select the tooth count based on your required gear ratio and available center distance. For a 2.5 module gear pair, the center distance equals (T1 + T2) x 2.5 \/ 2.\"}},{\"@type\":\"Question\",\"name\":\"What is the pressure angle of these spur gears?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These gears use the standard 20 degree pressure angle, the most widely adopted profile for industrial and hobbyist spur gears.\"}},{\"@type\":\"Question\",\"name\":\"Are these gears suitable for outdoor or corrosive environments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"45 carbon steel has moderate corrosion resistance. Apply a light machine oil or grease coating for outdoor use.\"}},{\"@type\":\"Question\",\"name\":\"Will these gears mesh with a Module 2.5 rack or worm gear?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, compatible with any standard Module 2.5 rack. Not designed to mesh with worm gears.\"}},{\"@type\":\"Question\",\"name\":\"How do I verify the bore diameter before ordering?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bore diameter varies by tooth count. Check variant specifications or contact us to confirm before ordering.\"}},{\"@type\":\"Question\",\"name\":\"What load capacity can these gears handle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Suitable for light-to-medium duty applications such as robotics, small CNC machines, and educational equipment.\"}},{\"@type\":\"Question\",\"name\":\"Can I order a matched gear pair in one transaction?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. 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