{"product_id":"spiral-bevel-gears-1-5-2-modulus-90-1-1-pairing-with-keyway-left-right-spiral","title":"Spiral Bevel Gears 1.5\/2 Modulus 90° 1:1 Pairing With Keyway,Left + right Spiral","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpiral Bevel Gears — Matched 90° Pairs for Smooth, Quiet Power Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your drivetrain demands a precise 90° direction change without the noise and vibration of straight-cut bevel gears, engineers and makers alike turn to spiral bevel gears. Whether you are building a CNC axis, a robotic joint, or a custom gearbox, mismatched or poorly paired bevel gears cause backlash, premature wear, and frustrating alignment headaches. This listing solves that problem by supplying a factory-matched left-spiral and right-spiral pair, guaranteed to mesh at the correct 90° angle with a 1:1 ratio right out of the box.\u003c\/p\u003e\n\u003cp\u003eEach set consists of two spiral bevel gears machined from alloy steel, featuring a helical tooth profile for gradual engagement and reduced operating noise. Available in 1.5 modulus and 2 modulus configurations, with tooth counts of 20T, 25T, and 30T. Bore diameters range from 10 mm (0.39 in) to 25 mm (0.98 in), and each bore is precision-cut with a standard keyway — 4×2 mm, 5×2.5 mm, 6×3 mm, or 8×3.5 mm depending on the bore size — for positive, slip-free shaft engagement.\u003c\/p\u003e\n\u003cp\u003eTypical applications include 90° right-angle gearboxes for CNC router Z-axes, robotic arm wrist joints requiring compact torque redirection, custom agricultural or industrial machinery where spiral bevel gear sets replace worn OEM components, and DIY power transmission projects demanding low-noise, high-efficiency direction change at a 1:1 speed ratio.\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 Sold as a matched left-spiral + right-spiral pair. Both gears share the same modulus and tooth count. Verify your shaft diameter and keyway dimensions before ordering. Not interchangeable with straight-cut bevel gears of the same modulus.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Spiral Bevel Gears\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eFactory-Matched Pairs\u003c\/strong\u003e — Each set ships as one left-spiral gear and one right-spiral gear pre-selected to mesh correctly at 90°, eliminating the guesswork of sourcing compatible mates separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003ePrecise 1:1 Ratio at 90°\u003c\/strong\u003e — Equal tooth counts on both gears deliver an exact 1:1 speed and torque ratio, making these ideal for direction-change applications where output speed must match input speed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eKeyway Bore for Positive Drive\u003c\/strong\u003e — Every bore is machined with a standard DIN keyway (4×2 mm up to 8×3.5 mm), ensuring a secure, non-slip connection to the shaft without relying on set screws alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eSpiral Tooth Profile for Quiet Operation\u003c\/strong\u003e — The helical spiral tooth geometry distributes load across multiple teeth simultaneously, reducing impact noise and vibration compared to straight-cut bevel gears under the same load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e \u003cstrong\u003eWide Modulus and Bore Selection\u003c\/strong\u003e — Choose from 1.5 or 2 modulus, 20T \/ 25T \/ 30T tooth counts, and bore diameters from 10 mm to 25 mm to match your specific shaft and torque requirements without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003eAlloy Steel Construction\u003c\/strong\u003e — Machined from alloy steel with a natural metallic finish, these gears offer the strength and wear resistance needed for continuous-duty mechanical power transmission in demanding environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Spiral Bevel Gear Pairs\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eSpiral Bevel Gear (Matched Pair)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpiral Direction\u003c\/th\u003e\n\u003ctd\u003eLeft Spiral + Right Spiral (1 set)\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\u003eGear Ratio\u003c\/th\u003e\n\u003ctd\u003e1:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Modulus\u003c\/th\u003e\n\u003ctd\u003e1.5 \/ 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Tooth Count\u003c\/th\u003e\n\u003ctd\u003e20T \/ 25T \/ 30T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e10 mm – 25 mm (0.39 in – 0.98 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Dimensions\u003c\/th\u003e\n\u003ctd\u003e4×2 mm \/ 5×2.5 mm \/ 6×3 mm \/ 8×3.5 mm (varies by bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAlloy Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural Metallic (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eSpiral (Helical Bevel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\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\u003eHow do I choose the right modulus and tooth count for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModulus determines the physical size of each tooth — a higher modulus means larger, stronger teeth capable of transmitting more torque. Choose 1.5 modulus for lighter-duty or space-constrained applications (e.g., small robotics, hobby CNC), and 2 modulus for heavier loads or larger shaft diameters. Tooth count affects the outer diameter of the gear: 20T produces the most compact gear, while 30T gives a larger pitch circle and smoother load distribution. Match the modulus to your existing gearbox design or calculate based on your torque and speed requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter and keyway size should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the bore diameter that matches your shaft diameter exactly. The keyway dimensions are determined by the bore size: 10–12 mm bores use a 4×2 mm keyway, 14–16 mm bores use 5×2.5 mm, 18–20 mm bores use 6×3 mm, and 22–25 mm bores use 8×3.5 mm. These follow standard DIN 6885 keyway dimensions. If your shaft has a pre-cut keyway, verify the width and depth match before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre both gears in the pair identical, or are they different?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe two gears in each set are mirror images of each other — one is left-hand spiral and the other is right-hand spiral. They share the same modulus, tooth count, and outer dimensions, but their tooth helix directions are opposite so they mesh correctly at 90°. Do not attempt to pair two left-spiral or two right-spiral gears, as they will not mesh properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these spiral bevel gears, and what loads can they handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese gears are machined from alloy steel, which provides significantly higher tensile and shear strength compared to carbon steel or cast iron alternatives. The spiral tooth profile distributes load across multiple teeth simultaneously, further increasing load capacity versus straight-cut bevel gears of the same modulus. Exact torque ratings depend on operating speed, lubrication, and mounting precision. For critical load calculations, consult standard gear engineering references using the modulus, tooth count, face width, and material properties.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these gears require lubrication, and how should they be maintained?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, spiral bevel gears require proper lubrication for optimal performance and longevity. For enclosed gearboxes, use a gear oil with viscosity appropriate for your operating speed and load (ISO VG 150–220 is common for moderate-speed applications). For open or semi-open installations, apply a consistent grease such as NLGI #2 lithium-complex grease to the tooth flanks. Inspect and replenish lubrication at regular intervals based on your duty cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these gears to replace worn OEM bevel gears in existing machinery?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, provided the replacement gears match the original modulus, tooth count, bore diameter, and keyway dimensions of the OEM parts. Measure the original gears carefully — modulus can be calculated from the outer diameter and tooth count (OD = modulus × (tooth count + 2) for standard gears). If the original gears are imperial (diametral pitch), note that metric modulus and imperial DP gears are not interchangeable even if they appear similar in size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between spiral bevel gears and straight-cut bevel gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStraight-cut bevel gears have teeth that run straight across the face of the gear cone, causing all tooth contact to occur simultaneously — this produces more noise and vibration, especially at higher speeds. Spiral bevel gears have curved, helical teeth that engage gradually along the tooth length, spreading the load over a larger contact area. The result is quieter operation, higher load capacity for the same gear size, and smoother torque transmission. Spiral bevel gears are the preferred choice for applications where noise, vibration, or continuous-duty performance is a concern.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Types, Bore Diameter, and Keyway \u0026amp; Amount 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 20Tooth \/ 10mm \/ 4*2mm \u0026 1Set(Left Spiral+Right Spiral)","offer_id":52439296835858,"sku":"FXLJGJXCD0801x1","price":49.64,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus 20Tooth \/ 12mm \/ 4*2mm \u0026 1Set(Left Spiral+Right Spiral)","offer_id":52439296868626,"sku":"FXLJGJXCD0802x1","price":49.64,"currency_code":"USD","in_stock":true},{"title":"1.5 Modulus 25Tooth \/ 12mm \/ 4*2mm \u0026 1Set(Left Spiral+Right 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