{"product_id":"mod-1-5-bevel-gear-c45-steel-1-1-25-ratio-20-25-tooth-8-16mm-bore-hardened-black","title":"Mod 1.5 Bevel Gear C45 Steel 1:1.25 Ratio 20\/25 Tooth 8-16mm Bore Hardened Black","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eMod 1.5 Bevel Gear — C45 Steel, 1:1.25 Ratio, Hardened Black Finish for Reliable Right-Angle Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen a right-angle drive fails mid-project — whether in a DIY gearbox, a CNC axis, or a custom automation rig — the culprit is almost always an undersized or poorly finished gear. This Mod 1.5 bevel gear is engineered for makers, machinists, and engineers who need a dependable 1:1.25 ratio right-angle transmission component without sourcing from industrial distributors.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from C45 medium-carbon steel and treated with a hardened black oxide finish for improved surface hardness and corrosion resistance. The module is 1.5, with tooth counts of 20 (driver) or 25 (driven) to achieve the 1:1.25 speed reduction ratio. Bore sizes range from 8mm to 16mm (approximately 0.31\" to 0.63\"), accommodating a wide range of shaft diameters. Tooth face width is typically 12–18mm depending on the tooth count variant.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY differential drives and steering mechanisms, small-scale CNC machine axis conversions requiring a 90° power turn, and custom robotics or automation builds where a compact bevel gear pair replaces a worm drive for higher efficiency.\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 for use as a matched 1:1.25 bevel gear pair (20T driver + 25T driven). Both gears share Module 1.5 tooth geometry. Verify bore size matches your shaft diameter before ordering. Keyway machining not included — bore is plain round.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Mod 1.5 Bevel Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eC45 Steel Construction\u003c\/strong\u003e — Medium-carbon steel body delivers the toughness needed for continuous torque loads in mechanical drives and DIY machinery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚫\u003c\/span\u003e\u003cstrong\u003eHardened Black Oxide Finish\u003c\/strong\u003e — Surface hardening improves wear resistance; black oxide coating adds a layer of corrosion protection for workshop and indoor environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eModule 1.5 Tooth Profile\u003c\/strong\u003e — Standard metric module ensures compatibility with other Mod 1.5 gears and allows precise meshing with matched bevel gear pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003e1:1.25 Speed Ratio\u003c\/strong\u003e — 20-tooth driver paired with 25-tooth driven gear delivers a clean 1:1.25 reduction, useful for moderate torque multiplication in right-angle drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eMulti-Bore Options (8–16mm)\u003c\/strong\u003e — Six bore size options (8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16mm) let you match the gear directly to your shaft without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, 3, 4, 5, or 10-piece quantities so you can order exactly what your build requires — single replacement or full project stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Mod 1.5 Bevel Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModule\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Driver)\u003c\/th\u003e\n\u003ctd\u003e20 Tooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Driven)\u003c\/th\u003e\n\u003ctd\u003e25 Tooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRatio\u003c\/th\u003e\n\u003ctd\u003e1:1.25\u003c\/td\u003e\n\u003c\/tr\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 Treatment\u003c\/th\u003e\n\u003ctd\u003eHardened Black Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size\u003c\/th\u003e\n\u003ctd\u003e8 \/ 10 \/ 12 \/ 14 \/ 15 \/ 16mm (See variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003ePlain round (no keyway)\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\u003eShaft Angle\u003c\/th\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Face Width\u003c\/th\u003e\n\u003ctd\u003eTypically 12–18mm (varies by tooth count)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003eSee variant options (1 \/ 2 \/ 3 \/ 4 \/ 5 \/ 10 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\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to buy both the 20-tooth and 25-tooth gears together?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — for a functional 1:1.25 bevel gear pair, you need one 20-tooth (driver) and one 25-tooth (driven) gear. They share the same Module 1.5 tooth geometry and mesh at a 90° shaft angle. If you only need a replacement for one side, you can order a single piece of the required tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a caliper. The bore must match your shaft exactly — a loose bore will cause slippage under load. Available sizes are 8, 10, 12, 14, 15, and 16mm. If your shaft is imperial (e.g., 3\/8\" = 9.5mm), choose the nearest metric bore and use a sleeve bushing or have the bore lightly reamed to fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I add a keyway to the bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore is supplied as a plain round hole with no keyway. If your application requires a keyed connection, a local machine shop can broach or mill a keyway into the bore after purchase. The C45 steel is machinable with standard tooling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the black oxide finish — is it suitable for outdoor use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe hardened black oxide finish improves surface hardness and provides mild corrosion resistance suitable for dry indoor environments and light workshop conditions. It is not recommended for continuous outdoor exposure, high-humidity environments, or direct contact with water without additional lubrication or sealing. For outdoor applications, apply a light coat of grease or anti-rust oil to the gear teeth and bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum torque or RPM these gears can handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eExact torque and RPM ratings depend on the specific bore size, shaft fit, lubrication, and operating conditions. As a conservative guideline for Mod 1.5 C45 steel bevel gears, continuous torque capacity is typically in the range of 5–15 N·m per gear depending on tooth count and load distribution. For high-speed or high-torque applications, contact us to confirm suitability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears sold as a matched pair or individually?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach listing variant represents a single gear type (either 20-tooth or 25-tooth) in your chosen bore size and quantity. To build a complete bevel gear pair, add one 20-tooth variant and one 25-tooth variant to your cart, both with matching bore sizes. Multi-piece quantities (2, 3, 4, 5, 10 pcs) refer to multiples of the same gear, not pairs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this gear mesh with other Mod 1.5 bevel gears from different brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn principle, yes — Module 1.5 is a standardized metric tooth profile, so gears from different manufacturers with the same module and pressure angle (20°) should mesh correctly. However, minor manufacturing tolerances can affect backlash and noise. For critical applications, we recommend using matched pairs from the same production batch for optimal meshing performance.\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 1.5【20 Tooth】 \/ 8mm \/ 1 pcs","offer_id":52439345529106,"sku":"PENGDZ00185x1","price":9.1,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【20 Tooth】 \/ 10mm \/ 1 pcs","offer_id":52439345561874,"sku":"PENGDZ00186x1","price":9.1,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【20 Tooth】 \/ 12mm \/ 1 pcs","offer_id":52439345594642,"sku":"PENGDZ00187x1","price":9.1,"currency_code":"USD","in_stock":true},{"title":"Module 1.5【25 Tooth】 \/ 10mm \/ 1 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