{"product_id":"4-5-6-mod-bevel-gear-15-30-teeth-90-degree-transmission-45-steel","title":"4\/5\/6 Mod Bevel Gear 15-30 Teeth Transmission Gears Bevel Teeth 90° 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4\/5\/6 Mod Bevel Gear for 90° Power Transmission — Precision-Cut 45# Steel\u003c\/h2\u003e\n\u003cp\u003eWhen a drive system demands a reliable 90-degree direction change, a poorly matched bevel gear becomes the weakest link — causing vibration, premature wear, and costly downtime. Engineers, machinists, and serious DIY builders who need a dependable intersecting-axis solution will find this bevel gear set engineered to deliver consistent mesh accuracy across a wide range of torque loads.\u003c\/p\u003e\n\u003cp\u003eEach gear is machined from 45# medium-carbon steel, offering a balanced combination of tensile strength and machinability. Available in three module sizes — Mod 4, Mod 5, and Mod 6 — with tooth counts ranging from 15 to 30 teeth and bore diameters spanning 12 mm (0.47 in) to 35 mm (1.38 in), including keyway variants (6 mm, 8 mm, and 10 mm keyways) for positive shaft locking. The 90° bevel angle enables direct perpendicular shaft coupling without additional gearbox housings.\u003c\/p\u003e\n\u003cp\u003eTypical applications include right-angle power transmission in conveyor drives, CNC router axis changes, agricultural equipment gearboxes, custom robotics joint assemblies, and DIY lathe or mill cross-slide drives — anywhere a compact 90° gear mesh 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 for mating bevel gear pairs at 90° shaft angle. Mod 4 gears mesh only with Mod 4 counterparts; Mod 5 with Mod 5; Mod 6 with Mod 6. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 45# Steel Bevel Gears\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eThree Module Options\u003c\/strong\u003e\n\u003cp\u003eMod 4, Mod 5, and Mod 6 available in a single listing — select the module that matches your mating gear for correct tooth mesh and load rating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003e15 to 30 teeth across variants, allowing gear ratio flexibility from approximately 1:1 to 2:1 when paired with a matching bevel gear of different tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eKeyway Bore Options\u003c\/strong\u003e\n\u003cp\u003ePlain bore (12–22 mm) and keyway bore variants (20 mm\/6 mm key, 22 mm\/6 mm key, 25 mm\/8 mm key, 35 mm\/10 mm key) for positive, slip-free shaft engagement under reversing loads.\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\u003eMachined from 45# steel (equivalent to C45\/1045 grade), delivering tensile strength typically in the 600–800 MPa range — suited for moderate-to-heavy industrial and workshop duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e90° Bevel Angle\u003c\/strong\u003e\n\u003cp\u003eStandard 90-degree pitch cone angle enables direct perpendicular shaft coupling, eliminating the need for worm gear reducers or complex housing adapters in right-angle drive layouts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eSingle-Piece Per Variant\u003c\/strong\u003e\n\u003cp\u003eEach variant ships as 1 PCS — order the exact quantity needed for your build without overstocking. Mix module and tooth count variants in a single order for complete drive assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Bevel Gear\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eBevel Gear (Straight Tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel (C45 \/ 1045 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e15 \/ 16 \/ 17 \/ 18 \/ 19 \/ 20 \/ 21 \/ 22 \/ 23 \/ 24 \/ 25 \/ 26 \/ 28 \/ 30 — see 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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e12 mm – 35 mm (0.47 in – 1.38 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e6 mm \/ 8 mm \/ 10 mm keyway (select variants); plain bore also available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Angle\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 PCS\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 module (Mod 4, 5, or 6) for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe module must match your mating bevel gear exactly — a Mod 4 gear will only mesh correctly with another Mod 4 gear. As a general rule, higher module numbers indicate larger, stronger teeth suited for heavier torque loads. Mod 4 is common in light-to-medium machinery and robotics; Mod 5 and Mod 6 are used in heavier industrial drives. Check your existing gear's module marking or measure tooth pitch to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a Mod 4 gear with a Mod 5 or Mod 6 gear?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. Gears of different modules are not interchangeable and will not mesh correctly. Mixing modules causes tooth interference, rapid wear, and potential gear failure. Always pair gears of the same module number.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the strength of 45# steel, and is it suitable for my load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel (equivalent to C45 or AISI 1045 medium-carbon steel) typically achieves tensile strength in the 600–800 MPa range in the normalized or quenched-and-tempered condition. It is well-suited for moderate-to-heavy duty mechanical drives, conveyor systems, and workshop machinery. For very high-speed or shock-load applications, consider whether additional heat treatment or a higher-alloy steel would be appropriate for your specific torque and RPM requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bevel gears resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# carbon steel has limited inherent corrosion resistance compared to stainless steel. For indoor, dry, or lightly oiled environments these gears perform reliably. For humid, wet, or chemically exposed environments, apply a suitable lubricant or protective coating, or contact us to confirm whether a coated variant is available for your use case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore diameter and keyway size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft's outer diameter precisely with calipers. Select the bore variant that matches your shaft diameter. If your shaft has a keyway slot, choose the corresponding keyway bore option (e.g., 20 mm bore with 6 mm keyway). Plain bore variants are suitable for press-fit, set-screw, or adhesive retention methods. Keyway variants provide positive torque transmission and are recommended for reversing or high-torque loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat gear ratio can I achieve with these bevel gears?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe gear ratio is determined by the tooth count of the two mating gears. For example, pairing a 15-tooth gear with a 30-tooth gear gives a 2:1 reduction ratio. A 20-tooth paired with a 20-tooth gives a 1:1 ratio (speed and torque unchanged, direction changed 90°). Select your driver and driven gear tooth counts based on the speed reduction or increase your application requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs one gear sufficient, or do I need to order two?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach variant ships as 1 PCS (one gear). A functional 90° bevel gear drive requires at least two mating gears — a driver and a driven gear. If you need a matched pair, add two variants to your cart, ensuring both share the same module number. Mix tooth counts to achieve your desired gear ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Modulus, Teeth count, and Bore \u0026amp; Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"4 Modulus \/ 15 Teeth \/ 12mm \u0026 1 PCS","offer_id":52439357063442,"sku":"GYJLTHXCDZH2128x1","price":69.35,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 16 Teeth \/ 12mm \u0026 1 PCS","offer_id":52439357096210,"sku":"GYJLTHXCDZH2129x1","price":84.71,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 17 Teeth \/ 15mm \u0026 1 PCS","offer_id":52439357128978,"sku":"GYJLTHXCDZH2130x1","price":102.07,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 18 Teeth \/ 12mm \u0026 1 PCS","offer_id":52439357161746,"sku":"GYJLTHXCDZH2131x1","price":98.31,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 19 Teeth \/ 15mm \u0026 1 PCS","offer_id":52439357194514,"sku":"GYJLTHXCDZH2132x1","price":130.76,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 20 Teeth \/ 16mm \u0026 1 PCS","offer_id":52439357227282,"sku":"GYJLTHXCDZH2133x1","price":127.77,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 21 Teeth \/ 19mm \u0026 1 PCS","offer_id":52439357260050,"sku":"GYJLTHXCDZH2134x1","price":157.61,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 22 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357292818,"sku":"GYJLTHXCDZH2135x1","price":175.97,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 23 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357325586,"sku":"GYJLTHXCDZH2136x1","price":198.36,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 24 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357358354,"sku":"GYJLTHXCDZH2137x1","price":220.71,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 25 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357391122,"sku":"GYJLTHXCDZH2138x1","price":220.85,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 26 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357423890,"sku":"GYJLTHXCDZH2139x1","price":263.23,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 28 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357456658,"sku":"GYJLTHXCDZH2140x1","price":304.84,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 30 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357489426,"sku":"GYJLTHXCDZH2141x1","price":323.94,"currency_code":"USD","in_stock":true},{"title":"5 Modulus \/ 20 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357522194,"sku":"GYJLTHXCDZH2142x1","price":215.9,"currency_code":"USD","in_stock":true},{"title":"5 Modulus \/ 25 Teeth \/ 20mm \u0026 1 PCS","offer_id":52439357554962,"sku":"GYJLTHXCDZH2143x1","price":364.41,"currency_code":"USD","in_stock":true},{"title":"5 Modulus \/ 30 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357587730,"sku":"GYJLTHXCDZH2144x1","price":488.63,"currency_code":"USD","in_stock":true},{"title":"6 Modulus \/ 20 Teeth \/ 18mm \u0026 1 PCS","offer_id":52439357620498,"sku":"GYJLTHXCDZH2145x1","price":310.47,"currency_code":"USD","in_stock":true},{"title":"6 Modulus \/ 25 Teeth \/ 22mm \u0026 1 PCS","offer_id":52439357653266,"sku":"GYJLTHXCDZH2146x1","price":496.93,"currency_code":"USD","in_stock":true},{"title":"6 Modulus \/ 28 Teeth \/ 22mm \u0026 1 PCS","offer_id":52439357686034,"sku":"GYJLTHXCDZH2147x1","price":646.12,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 20 Teeth \/ 20mm Keyway 6mm \u0026 1 PCS","offer_id":52439357718802,"sku":"GYJLTHXCDZH2148x1","price":131.36,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 20 Teeth \/ 22mm Keyway 6mm \u0026 1 PCS","offer_id":52439357751570,"sku":"GYJLTHXCDZH2149x1","price":131.36,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 20 Teeth \/ 25mm Keyway 8mm \u0026 1 PCS","offer_id":52439357784338,"sku":"GYJLTHXCDZH2150x1","price":131.36,"currency_code":"USD","in_stock":true},{"title":"4 Modulus \/ 20 Teeth \/ 35mm Keyway 10mm \u0026 1 PCS","offer_id":52439357817106,"sku":"GYJLTHXCDZH2151x1","price":131.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-08_98fa6d80-cbf3-4239-8714-d30d47b40869.jpg?v=1783394348","url":"https:\/\/homediyer.com\/products\/4-5-6-mod-bevel-gear-15-30-teeth-90-degree-transmission-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}