{"product_id":"1-5-modulus-metal-bevel-gear-20t-40t-90-degree-pairing-bore-8-20mm","title":"1.5 Modulus Metal Umbrella Gear 20\/40T 90° 1:2 Pairing Bevel Gear Bore 8-20mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e1.5 Modulus Bevel Gear Pair — Precision 90° Power Transmission for Makers and Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen your drivetrain needs to change direction without losing torque, a mismatched or imprecise bevel gear set becomes the weakest link in your build. Whether you are designing a CNC axis, a robotic joint, or a custom mechanical assembly, these 1.5 modulus metal umbrella bevel gears give you a matched 20T\/40T pair engineered to mesh at exactly 90° with a 1:2 speed ratio — so your motion stays smooth and your tolerances stay tight.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from metal alloy (typically carbon steel or alloy steel) with a 1.5 modulus tooth profile. The 20-tooth pinion and 40-tooth wheel are available as individual selections from a matched pairing set. Bore sizes range from 8 mm (0.31 in) to 20 mm (0.79 in), with optional keyway cuts of 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm to suit standard shaft-key configurations. Outer diameter varies by tooth count — typically 33 mm (1.30 in) for the 20T gear and 63 mm (2.48 in) for the 40T gear.\u003c\/p\u003e\n\u003cp\u003eThese bevel gears are well suited for DIY gearbox builds requiring a 2:1 reduction, robotics arm joints where a 90° direction change is needed, CNC router Z-axis or rotary axis drives, and small automation prototypes where a compact right-angle drive is required.\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 pair as a matched 20T + 40T set at 90° mesh angle. Bore options 8–20 mm fit standard metric shafts. Keyway dimensions follow DIN 6885 \/ ISO 773 standards for common shaft-key fits.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 1.5 Modulus Bevel Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eMatched 20T\/40T Pairing\u003c\/strong\u003e\n\u003cp\u003eSold as individually selectable gears from a pre-matched set engineered to mesh together at a 1:2 ratio, eliminating the guesswork of sourcing compatible gears separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003ePrecise 90° Mesh Angle\u003c\/strong\u003e\n\u003cp\u003eThe umbrella bevel tooth geometry delivers a true 90° power transmission axis, ideal for right-angle gearbox designs and direction-change drivetrains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Bore Range: 8–20 mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in 11 bore sizes from 8 mm to 20 mm to fit a broad range of metric shafts used in robotics, automation, and DIY mechanical projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eOptional Keyway Configurations\u003c\/strong\u003e\n\u003cp\u003eChoose from No Keyway, 4×1.8 mm, 5×2.3 mm, or 6×2.8 mm keyway cuts to match your shaft-key standard and ensure positive torque transmission without slippage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eMetal Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined from carbon or alloy steel with consistent tooth geometry across the full face width, providing reliable load-bearing capacity for continuous-duty applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003e1.5 Modulus Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe 1.5 modulus standard ensures interchangeability with other 1.5M bevel gear components and predictable contact ratios for smooth, low-noise 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 — 1.5 Modulus Bevel Gear\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModulus\u003c\/th\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Numbers (Pairing Set)\u003c\/th\u003e\n\u003ctd\u003e20T (pinion) + 40T (wheel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMesh Angle\u003c\/th\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed Ratio\u003c\/th\u003e\n\u003ctd\u003e1:2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e8 mm – 20 mm (0.31 in – 0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003eNo Keyway \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (20T)\u003c\/th\u003e\n\u003ctd\u003eTypically ~33 mm (1.30 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (40T)\u003c\/th\u003e\n\u003ctd\u003eTypically ~63 mm (2.48 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel \/ alloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile Standard\u003c\/th\u003e\n\u003ctd\u003e1.5 Modulus bevel (umbrella type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 Pc (single gear per variant)\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\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 the 20T and 40T gears separately, or do they come as a pair?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach listing variant represents a single gear. To build a complete 90° 1:2 bevel gear set, you need to select and purchase both the 20T pinion and the 40T wheel. Make sure both gears share the same modulus (1.5) and that your bore sizes match your shaft diameters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bore size for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a caliper and select the matching bore size from the dropdown. Available bores are 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, and 20 mm. If your shaft is imperial (e.g., 1\/2 in = 12.7 mm), the 12.7 mm bore option is available for a direct fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat keyway size should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway dimensions follow standard shaft-key fits. As a general guide: 4×1.8 mm keyways suit shafts in the 10–12 mm range, 5×2.3 mm suits 14–15 mm shafts, and 6×2.8 mm suits 16–20 mm shafts. If your shaft has no keyway slot, select No Keyway and secure the gear with a set screw or interference fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these bevel gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese gears are machined from metal alloy and are suitable for moderate-duty applications such as robotics, CNC auxiliary axes, and DIY gearboxes. Exact load ratings depend on operating speed, lubrication, and shaft alignment. For heavy industrial loads or continuous high-torque applications, confirm your torque requirements against the gear face width and material grade before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these gears corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe base material is carbon or alloy steel, which offers good mechanical strength but moderate corrosion resistance. For environments with moisture or mild chemicals, apply a light machine oil or grease to the tooth faces and bore. For highly corrosive environments, consider stainless steel alternatives or apply a protective coating after installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these gears work with other 1.5 modulus bevel gears I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — as long as the mating gear shares the same 1.5 modulus and is designed for a 90° mesh angle, these gears will be geometrically compatible. Always verify the pressure angle (typically 20°) matches between mating gears to ensure correct tooth contact and avoid premature wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I purchase just one gear (20T or 40T) without buying both?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. You can purchase either gear individually by selecting the tooth number and bore size from the variant options. This is useful if you need a replacement for a worn gear in an existing assembly, or if you are building a custom ratio using a different mating gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Tooth Number, Bore size, and Keyway option above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1.5 Modulus-40T \/ 12mm \/ No Keyway \u0026 1Pcs","offer_id":52439285137682,"sku":"FXL782-0","price":15.9,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus-40T \/ 12.7mm \/ No Keyway \u0026 1Pcs","offer_id":52439285170450,"sku":"FXL782-1","price":15.9,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus-40T \/ 14mm \/ No Keyway \u0026 1Pcs","offer_id":52439285203218,"sku":"FXL782-2","price":15.9,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus-40T \/ 15mm \/ No Keyway \u0026 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