{"product_id":"bevel-gear-4-module-ratio-1-1-teeth-20-bore-dia-20mm-22mm-24mm-25mm-28mm-40mm","title":"Bevel Gear 4 Module Ratio 1:1 Teeth 20 Bore Dia 20mm 22mm 24mm 25mm 28mm - 40mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e4 Module 20-Tooth Bevel Gear — Precision Right-Angle Power Transmission\u003c\/h2\u003e\n    \u003cp\u003eWhen your drivetrain demands a reliable 90° direction change without sacrificing torque or rotational accuracy, a mismatched or worn bevel gear becomes the weakest link in the entire system. Engineers, robotics builders, and DIY machinery enthusiasts who need a 4 Module 20-tooth bevel gear with a 1:1 ratio will find this component engineered to deliver consistent mesh engagement and minimal backlash across demanding duty cycles.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from carbon steel with a natural metallic finish, offering a balance of hardness and machinability. The 4 Module (Mod 4) tooth profile follows standard metric gear geometry, with an outer diameter typically in the range of 88–92mm (approx. 3.46–3.62 in) depending on bore selection. Bore diameters span 20mm to 40mm (0.79 in to 1.57 in), covering the most common shaft sizes used in metric mechanical assemblies.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include right-angle gearbox assemblies for CNC router axis drives, custom conveyor direction-change modules, and compact robotic joint actuators where a 1:1 bevel gear pair is required for synchronized shaft rotation at 90°. The standardized Mod 4 tooth pitch also makes these gears straightforward to pair with matching bevel pinions sourced from any metric gear supplier.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed to mesh with any Mod 4 (Module 4) bevel gear of matching tooth count and pressure angle. Verify shaft diameter before ordering — bore sizes range from 20mm to 40mm. Keyway or set-screw machining may be required for your specific shaft.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 4 Module Bevel Gears\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e1:1 Ratio, 20 Teeth\u003c\/strong\u003e\u003cbr\u003e\n        Identical tooth count on both mating gears ensures a true 1:1 speed and torque ratio — ideal for direction-change applications where no speed reduction is needed.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eMod 4 Standard Tooth Profile\u003c\/strong\u003e\u003cbr\u003e\n        Follows ISO metric Module 4 geometry for predictable mesh with any compliant Mod 4 bevel pinion, simplifying sourcing and replacement.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n        \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\u003cbr\u003e\n        Machined from carbon steel for a combination of surface hardness and core toughness, resisting wear under sustained rotational loads.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range: 20–40mm\u003c\/strong\u003e\u003cbr\u003e\n        Nine bore size options (20, 22, 24, 25, 28, 30, 32, 35, 40mm) accommodate the most common metric shaft diameters used in industrial and DIY machinery.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\n        \u003cstrong\u003eLow-Backlash Tooth Geometry\u003c\/strong\u003e\u003cbr\u003e\n        Precision-cut tooth flanks minimize angular play between mating gears, supporting accurate positioning in CNC and servo-driven systems.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003e90° Power Transmission\u003c\/strong\u003e\u003cbr\u003e\n        Bevel gear geometry redirects rotational force at a right angle, enabling compact gearbox layouts where parallel shaft arrangements are not feasible.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 4 Bevel Gear\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Mod)\u003c\/th\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e20T\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\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\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e20 \/ 22 \/ 24 \/ 25 \/ 28 \/ 30 \/ 32 \/ 35 \/ 40 mm — See variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eTypically 88–92mm (3.46–3.62 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural metallic (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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        \u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 pc per order (single gear only)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the correct bore size for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your shaft diameter with a caliper and select the matching bore size from the variant dropdown. Available bores are 20, 22, 24, 25, 28, 30, 32, 35, and 40mm. If your shaft requires a keyway or set-screw hole, that machining is typically done after purchase by a local machine shop.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill this gear mesh with my existing Mod 4 bevel pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as your existing pinion is also Mod 4 with 20 teeth and a 20° pressure angle, these gears will mesh correctly. Confirm the module and tooth count on your current gear before ordering. Mixing different modules (e.g., Mod 3 with Mod 4) will result in incorrect mesh and accelerated wear.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load capacity of this bevel gear?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on operating speed, lubrication, and mounting rigidity. Carbon steel Mod 4 bevel gears of this tooth count are suited for light-to-medium duty applications such as robotics joints, small conveyor drives, and CNC auxiliary axes. For heavy industrial loads exceeding continuous high-torque operation, consult an engineer for a formal gear strength calculation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this gear corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear is machined from carbon steel with a natural (uncoated) finish, which offers moderate corrosion resistance in dry indoor environments. For humid, wet, or outdoor applications, apply a light machine oil or grease to the tooth flanks and bore, or consider sourcing a stainless steel variant if your environment demands it.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to buy two gears to make a working bevel gear pair?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Each order contains one gear. For a complete 1:1 bevel gear pair, you need to purchase two gears — one for each shaft. Since the ratio is 1:1 and both gears have 20 teeth, both gears in the pair are identical, so you can simply order two of the same variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat lubrication is recommended for these bevel gears?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA medium-viscosity gear grease (NLGI Grade 1 or 2) applied to the tooth contact faces is recommended for most applications. For high-speed, low-load scenarios, a light machine oil may be sufficient. Re-lubricate periodically based on your duty cycle and operating environment.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this gear in a CNC machine or 3D printer build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Mod 4 bevel gears are commonly used in CNC router axis direction-change assemblies and custom 3D printer extruder gearboxes. Ensure your motor shaft matches one of the available bore sizes, and that your gearbox housing provides adequate support for both shafts to maintain correct center distance and mesh alignment.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your bore diameter and quantity above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"4 Module 20T Bore 20mm \/ 1 pcs","offer_id":52439283433746,"sku":"PHGLFBLTYHXCDZH3421x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 22mm \/ 1 pcs","offer_id":52439283466514,"sku":"PHGLFBLTYHXCDZH3422x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 24mm \/ 1 pcs","offer_id":52439283499282,"sku":"PHGLFBLTYHXCDZH3423x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 25mm \/ 1 pcs","offer_id":52439283532050,"sku":"PHGLFBLTYHXCDZH3424x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 28mm \/ 1 pcs","offer_id":52439283564818,"sku":"PHGLFBLTYHXCDZH3425x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 30mm \/ 1 pcs","offer_id":52439283597586,"sku":"PHGLFBLTYHXCDZH3426x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 32mm \/ 1 pcs","offer_id":52439283630354,"sku":"PHGLFBLTYHXCDZH3427x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 35mm \/ 1 pcs","offer_id":52439283663122,"sku":"PHGLFBLTYHXCDZH3428x1","price":129.91,"currency_code":"USD","in_stock":true},{"title":"4 Module 20T Bore 40mm \/ 1 pcs","offer_id":52439283695890,"sku":"PHGLFBLTYHXCDZH3429x1","price":129.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-07_baf667e1-cf16-42c6-a674-c4dd4450ac8c.jpg?v=1782958874","url":"https:\/\/homediyer.com\/products\/bevel-gear-4-module-ratio-1-1-teeth-20-bore-dia-20mm-22mm-24mm-25mm-28mm-40mm","provider":"HomeDIYer","version":"1.0","type":"link"}