{"product_id":"bevel-gear-c45-steel-mod-2-5-miter-gear-ratio-1-1-20-25-30-tooth-hardened-black","title":"Bevel Gear C45 Steel Mod 2.5 Miter Gear Ratio 1:1 20\/25\/30 Tooth Hardened Black","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 2.5 Bevel Gear — Precision Miter Drive for Demanding Right-Angle Transmissions\u003c\/h2\u003e\n\u003cp\u003eWhen your shaft layout demands a clean 90° power transfer and slop or backlash simply isn't an option, most off-the-shelf gears fall short. Engineers, machine builders, and serious DIYers working on conveyors, robotics, CNC axes, and industrial drives need a bevel gear that holds tight tolerances under load — without corroding or chipping after the first few hundred hours. These Mod 2.5 miter bevel gears are built for exactly that application.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from C45 medium-carbon steel and finished with a hardened black oxide coating for corrosion resistance and reduced surface friction. The module (pitch) is 2.5, with a 1:1 miter ratio (equal tooth count on both mating gears). Available in 20-tooth, 25-tooth, and 30-tooth configurations, with outer diameters ranging approximately 55 mm (2.17 in) to 80 mm (3.15 in) depending on tooth count. Bore sizes span 12 mm to 35 mm (0.47 in – 1.38 in), each paired with a precision-cut keyway for positive shaft engagement.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include right-angle gearbox assemblies for conveyor drive systems, 1:1 speed-ratio axis transfers in CNC router and mill builds, and paired miter gear sets for agricultural or workshop machinery requiring synchronized shaft rotation. The hardened black finish also makes these a clean fit for exposed-mechanism display machines and maker projects where aesthetics matter alongside function.\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 to mate with any Module 2.5 bevel\/miter gear of matching tooth count and pressure angle (typically 20°). Bore sizes with keyways suit standard metric shafts. Confirm shaft diameter and keyway dimensions against your variant selection before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 2.5 Bevel Miter Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eC45 Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from C45 medium-carbon steel — a workhorse material that balances machinability with solid tensile strength, suitable for moderate-to-heavy torque loads in industrial and workshop environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e \u003cstrong\u003eHardened Black Oxide Finish\u003c\/strong\u003e\n\u003cp\u003eThe black oxide surface treatment improves corrosion resistance, reduces light reflection, and lowers surface friction between mating gear faces — extending service life in both dry and lightly lubricated conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eModule 2.5 | 1:1 Miter Ratio\u003c\/strong\u003e\n\u003cp\u003eTrue miter configuration with equal tooth counts on both gears delivers a precise 1:1 speed ratio at 90°. Module 2.5 pitch provides a strong tooth profile capable of handling meaningful torque without stripping.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003ePrecision Keyway Bore\u003c\/strong\u003e\n\u003cp\u003eEvery bore option includes a machined keyway (4 mm, 5 mm, or 8 mm depending on bore size) for positive, slip-free shaft coupling — no set-screw-only connections that can walk under reversing loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSingle or Paired Sets\u003c\/strong\u003e\n\u003cp\u003eOrder as 1 pcs for replacement or prototype use, or select 2 pcs to receive a matched miter pair ready for direct installation into your right-angle drive assembly — saving sourcing time and ensuring tooth compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e \u003cstrong\u003eThree Tooth Count Options\u003c\/strong\u003e\n\u003cp\u003eChoose 20T, 25T, or 30T to match your required pitch circle diameter and available envelope space. Larger tooth counts yield a larger pitch circle and distribute load across more teeth for smoother, quieter operation.\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 — Mod 2.5 Bevel Miter Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eC45 Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eHardened Black Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Ratio\u003c\/th\u003e\n\u003ctd\u003e1:1 (Miter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (typical for Mod 2.5 miter gears)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e20T \/ 25T \/ 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size Range\u003c\/th\u003e\n\u003ctd\u003e12 mm – 35 mm (0.47 in – 1.38 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 5 mm \/ 8 mm (varies by bore — see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eShaft Angle\u003c\/th\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pcs or 2 pcs (select above)\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 20T, 25T, and 30T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pitch circle diameter of the gear. A 20-tooth gear has a smaller outer diameter and is suited for compact assemblies with limited space. A 30-tooth gear has a larger pitch circle, distributes load across more teeth, and typically runs quieter under sustained load. Choose based on your available envelope space and torque requirements. All three options share the same Module 2.5 pitch, so they are not interchangeable with each other — both mating gears in a pair must have the same tooth count for a 1:1 ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to order 2 pcs to get a working miter pair?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — a miter gear drive requires two identical gears (same module, same tooth count) mounted at 90° to each other. If you are building a new assembly, select the \"2 pcs\" amount option to receive a matched pair. If you are replacing a single worn gear in an existing drive, the \"1 pcs\" option is sufficient, provided the existing gear is also Module 2.5 with the same tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size and keyway should I select for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter precisely with calipers. Select the bore size that matches your shaft — for example, if your shaft is 18 mm, choose \"18mm + 6mm Keyway.\" The keyway dimension listed (e.g., 6 mm) refers to the width of the keyway slot. Ensure your shaft has a matching key slot machined to the same width and depth. If your shaft diameter falls between listed bore sizes, do not force a smaller bore — contact us to confirm options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears strong enough for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eC45 steel has a typical tensile strength of approximately 600–800 MPa depending on heat treatment. The hardened black oxide finish adds surface hardness and corrosion resistance. These gears are suitable for moderate-to-heavy industrial and workshop torque loads. For very high-speed or shock-load applications (e.g., impact machinery), consider consulting a mechanical engineer to verify the gear rating against your specific torque and RPM requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears rust or corrode?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe black oxide coating provides a degree of corrosion resistance suitable for indoor workshop and industrial environments. For outdoor or high-humidity applications, periodic lubrication with a gear grease or light oil is recommended to maintain the surface and extend service life. Black oxide is not a substitute for stainless steel in wet or chemically aggressive environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use one of these gears with a different module gear I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. Gears must share the same module to mesh correctly. A Module 2.5 gear will not mesh properly with a Module 2, Module 3, or any other module gear. Additionally, for a miter (1:1) configuration, both gears must have the same tooth count. Using mismatched modules or tooth counts will result in improper meshing, noise, accelerated wear, and potential failure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat lubrication do you recommend for these bevel gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor most applications, a medium-viscosity gear grease (NLGI Grade 1 or 2) applied to the tooth faces at installation is sufficient. For higher-speed applications, a splash or circulating gear oil may be more appropriate. Avoid dry running for extended periods, as it will accelerate tooth wear even on hardened surfaces. Re-lubricate periodically based on your duty cycle and operating environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Models, Bore Size, and Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Module 2.5【20 Tooth】 \/ 12mm + 4mm Keyway \/ 1 pcs","offer_id":52439316726034,"sku":"PENGDZ00125x1","price":43.78,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【20 Tooth】 \/ 14mm + 5mm Keyway \/ 1 pcs","offer_id":52439316758802,"sku":"PENGDZ00126x1","price":43.78,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【20 Tooth】 \/ 15mm + 5mm Keyway \/ 1 pcs","offer_id":52439316791570,"sku":"PENGDZ00127x1","price":43.78,"currency_code":"USD","in_stock":true},{"title":"Module 2.5【20 Tooth】 \/ 16mm + 5mm Keyway \/ 1 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