{"product_id":"straight-bevel-gear-2-1-ratio-45-steel-90-degree-1-1-5-2-3-mod-transmission-gear","title":"Straight Bevel Gear 2:1 Ratio 45#Steel 90 Degree 1 1.5 2 3 Mod Transmission Gear","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eStraight Bevel Gear 2:1 Ratio — 45# Steel, 90° Shaft Angle for Precision Transmission\u003c\/h2\u003e\n\u003cp\u003eWhen your drivetrain demands a reliable 90-degree power turn without slippage or backlash creep, a mismatched or undersized bevel gear pair becomes the weakest link in the entire system. Makers, robotics engineers, and CNC builders who need a repeatable 2:1 speed reduction at a right-angle junction will find this straight bevel gear set engineered to hold up under real load cycles.\u003c\/p\u003e\n\u003cp\u003eEach set consists of a matched pinion and wheel pair machined from 45# medium-carbon steel — a material known for its balance of tensile strength and machinability. The gear pairs are available in module sizes of 1, 1.5, 2, 2.5, and 3 Mod, with tooth counts ranging from 15T+30T up to 20T+40T depending on the selected variant. Bore diameter and hub dimensions vary by module; refer to variant options for exact measurements.\u003c\/p\u003e\n\u003cp\u003eTypical applications include DIY gearbox builds requiring a 2:1 reduction stage, robotic arm joints needing a compact 90-degree torque transfer, CNC axis drives where a right-angle bevel stage replaces a worm gear for higher efficiency, and small-scale industrial automation prototypes where shaft intersection at 90° is a layout constraint.\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 90° intersecting shaft configurations. Pinion and wheel are sold as a matched pair. Confirm bore diameter and hub length against your shaft spec before ordering — see variant options for module-specific dimensions.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Straight Bevel Gear Sets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003eMatched 2:1 Gear Ratio Pair\u003c\/strong\u003e\n\u003cp\u003ePinion and wheel are machined and paired at the factory to deliver a consistent 2:1 speed reduction, eliminating the guesswork of sourcing and matching individual gears.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e\n\u003cp\u003e45# steel offers a tensile strength of approximately 600–800 MPa, making these gears suitable for moderate-to-heavy torque loads in both continuous and intermittent duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eMulti-Module Selection (1–3 Mod)\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1, 1.5, 2, 2.5, and 3 Mod to match your existing gear train pitch. Larger modules handle higher torque; smaller modules suit compact, high-speed layouts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003e90° Shaft Intersection Geometry\u003c\/strong\u003e\n\u003cp\u003eStraight bevel tooth profile is cut for a precise 90-degree shaft angle, enabling right-angle power transmission without the efficiency losses associated with worm gear drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eMultiple Tooth Count Options\u003c\/strong\u003e\n\u003cp\u003eChoose from 15T+30T, 16T+32T, 18T+36T, or 20T+40T combinations to balance pitch line velocity, torque capacity, and physical envelope for your specific application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eSold as a Matched Pair\u003c\/strong\u003e\n\u003cp\u003eEach order includes one pinion and one wheel, pre-matched for correct tooth engagement. No additional pairing or lapping required before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Straight Bevel Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eGear Type\u003c\/th\u003e\n\u003ctd\u003eStraight Bevel Gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRatio\u003c\/th\u003e\n\u003ctd\u003e2:1\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e1 \/ 1.5 \/ 2 \/ 2.5 \/ 3 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count (Pinion + Wheel)\u003c\/th\u003e\n\u003ctd\u003e15T+30T \/ 16T+32T \/ 18T+36T \/ 20T+40T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20° (standard straight bevel)\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\u003eHub Length\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\u003eNatural steel (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Contents\u003c\/th\u003e\n\u003ctd\u003e1 Matched Pair (1 Pinion + 1 Wheel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Standard\u003c\/th\u003e\n\u003ctd\u003eGB\/T (metric module)\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 module size for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eModule (Mod) determines the tooth size and pitch. A larger module (e.g., 3 Mod) means bigger teeth that can handle more torque but require more space. A smaller module (e.g., 1 Mod) suits compact, higher-speed applications with lower torque. Match the module to your existing gear train or calculate based on the torque and speed requirements of your drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count combination should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll combinations maintain the 2:1 ratio — the difference lies in physical size and pitch line velocity. A 15T+30T pair is more compact; a 20T+40T pair distributes load across more teeth, which can reduce wear under sustained load. Choose based on your available envelope and duty cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these gears under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel has a typical tensile strength of 600–800 MPa and yield strength of approximately 355 MPa. Actual load capacity depends on module size, tooth count, operating speed, lubrication, and duty cycle. For high-cycle or shock-load applications, consider adding a lubricant and verifying the calculated tangential force against the gear's rated capacity for the selected module.\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\u003e45# steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease to the tooth surfaces and bore. If long-term corrosion resistance is required, consider applying a zinc or black oxide coating after installation, or contact us to discuss alternative material options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with helical bevel gears or worm gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo — straight bevel gears must be paired with a matching straight bevel gear of the same module and pressure angle. They are not interchangeable with helical bevel, spiral bevel, or worm gears. The pinion and wheel in each set are factory-matched and should always be used together.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter do these gears have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBore diameter varies by module and tooth count. Please refer to the variant options on this page or contact us with your selected variant (e.g., \"2 Mod 18T+36T\") and we will confirm the exact bore diameter and hub length before you order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need any special tools to install these gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard installation requires a shaft with the correct diameter to match the bore, a keyway or set screw arrangement for shaft retention (depending on your hub design), and a suitable gear housing or bearing support to maintain the 90° shaft alignment. No special tooling beyond common workshop equipment is needed for assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Modulus \u0026amp; Teeth combination above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1.5Mod 15T+30T \/ 1 Pair","offer_id":52439251910930,"sku":"GLFBNHHJGJXCD0043x1","price":48.48,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 16T+32T \/ 1 Pair","offer_id":52439251943698,"sku":"GLFBNHHJGJXCD0044x1","price":111.51,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 18T+36T \/ 1 Pair","offer_id":52439251976466,"sku":"GLFBNHHJGJXCD0045x1","price":73.51,"currency_code":"USD","in_stock":true},{"title":"1.5Mod 20T+40T \/ 1 Pair","offer_id":52439252009234,"sku":"GLFBNHHJGJXCD0046x1","price":66.98,"currency_code":"USD","in_stock":true},{"title":"2Mod 15T+30T \/ 1 Pair","offer_id":52439252042002,"sku":"GLFBNHHJGJXCD0047x1","price":77.91,"currency_code":"USD","in_stock":true},{"title":"2Mod 16T+32T \/ 1 Pair","offer_id":52439252074770,"sku":"GLFBNHHJGJXCD0048x1","price":99.21,"currency_code":"USD","in_stock":true},{"title":"2Mod 18T+36T \/ 1 Pair","offer_id":52439252107538,"sku":"GLFBNHHJGJXCD0049x1","price":131.63,"currency_code":"USD","in_stock":true},{"title":"2Mod 20T+40T \/ 1 Pair","offer_id":52439252140306,"sku":"GLFBNHHJGJXCD0050x1","price":153.26,"currency_code":"USD","in_stock":true},{"title":"2.5Mod 15T+30T \/ 1 Pair","offer_id":52439252173074,"sku":"GLFBNHHJGJXCD0051x1","price":126.06,"currency_code":"USD","in_stock":true},{"title":"2.5Mod 16T+32T \/ 1 Pair","offer_id":52439252205842,"sku":"GLFBNHHJGJXCD0052x1","price":143.33,"currency_code":"USD","in_stock":true},{"title":"2.5Mod 18T+36T \/ 1 Pair","offer_id":52439252238610,"sku":"GLFBNHHJGJXCD0053x1","price":164.55,"currency_code":"USD","in_stock":true},{"title":"2.5Mod 20T+40T \/ 1 Pair","offer_id":52439252271378,"sku":"GLFBNHHJGJXCD0054x1","price":186.85,"currency_code":"USD","in_stock":true},{"title":"3Mod 15T+30T \/ 1 Pair","offer_id":52439252304146,"sku":"GLFBNHHJGJXCD0055x1","price":222.21,"currency_code":"USD","in_stock":true},{"title":"3Mod 18T+36T \/ 1 Pair","offer_id":52439252336914,"sku":"GLFBNHHJGJXCD0056x1","price":321.3,"currency_code":"USD","in_stock":true},{"title":"3Mod 20T+40T \/ 1 Pair","offer_id":52439252369682,"sku":"GLFBNHHJGJXCD0057x1","price":334.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_f4c22a20-451f-4a3c-9cea-409a33cdb443.jpg?v=1782919029","url":"https:\/\/homediyer.com\/products\/straight-bevel-gear-2-1-ratio-45-steel-90-degree-1-1-5-2-3-mod-transmission-gear","provider":"HomeDIYer","version":"1.0","type":"link"}