{"id":16830,"date":"2026-06-15T14:54:02","date_gmt":"2026-06-15T12:54:02","guid":{"rendered":"https:\/\/www.abp-antrieb.de\/?p=16830"},"modified":"2026-06-23T08:58:50","modified_gmt":"2026-06-23T06:58:50","slug":"couplings-torque","status":"publish","type":"post","link":"https:\/\/www.abp-antrieb.de\/en\/blog\/shaft-couplings-3\/couplings-torque\/","title":{"rendered":"Keyway in shaft couplings"},"content":{"rendered":"\t\t
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Knowledge<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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What is a keyway?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A keyway is a longitudinal slot in a shaft or hub in which a key is inserted. The key connects both components in a form-fit way and prevents relative rotation between shaft and hub. <\/p>

A keyway is machined into both the shaft and the hub. Together with the key it forms a form-fit connection with defined clearance for torque transmission. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Typical areas of application<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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  • Shaft couplings<\/li>
  • Gear motors<\/li>
  • Gears<\/li>
  • Pulleys<\/li>
  • Pumps and fans<\/li>
  • Mechanical and plant engineering<\/li><\/ul>


    Standards such as DIN 6885 ensure defined dimensions and high interchangeability.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Keyways<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Keyways \u2013 essential or just an option?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Form-fit connection for torque transmission<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Keyways are a classic shaft-hub connection. The principle is simple and effective:Torque is transmitted in a form-fit way through the side faces of the key between shaft and hub. <\/p>

    The key sits in the keyways of shaft and hub and provides a reliable form-fit connection with defined clearance. In shaft couplings this allows torque transmission even under changing loads. <\/p>

    Simple assembly and reliable functionA keyway connection is easy to assemble and maintain.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Advantages of keyways:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    • fast assembly and disassembly<\/li>
    • standardized design according to DIN<\/li>
    • cost-efficient manufacturing<\/li>
    • easy spare part supply<\/li>
    • reliable torque transmission<\/li><\/ul>


      Especially in service situations components can be replaced quickly without rework<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      Geometry<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      Small geometry high responsibility<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      The performance of a keyway depends on a few critical factors:<\/p>

      • sufficient contact area<\/li>
      • correct surface pressure<\/li>
      • sufficient flank pressure and shear strength of the key<\/li>
      • precise machining of the keyway geometry<\/li><\/ul>


        The keyway is therefore not a minor detail but an important element of torque transmission<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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        Tolerance<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        Which tolerance for keyways?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        The correct tolerance influences function wear and service life of the connection.Too large tolerances cause clearance and micro movements. Too tight fits make assembly difficult.In mechanical engineering keyways are usually manufactured according to DIN 6885. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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        Direction of torque<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        Low backlash reliable proven<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        Properly designed keyway connections offer several advantages in operation:<\/p>

        • less micro movement<\/li>
        • reduced wear<\/li>
        • higher process reliability<\/li>
        • reliable torque transmission<\/li><\/ul>


          This makes them suitable for applications with high requirements on operational safety and stable torque transfer.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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          Table<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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          Keyway table \u2013 dimensions and standards<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          A keyway table is used to select suitable key and keyway sizes.<\/p>

          Typical assignments according to DIN 6885:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          Shaft diameter<\/th>\nKeyway size<\/th>\n<\/tr>\n<\/thead>\n
          6-8 mm<\/td>\n2 x 2 mm<\/td>\n<\/tr>\n
          8-10 mm<\/td>\n3 x 3 mm<\/td>\n<\/tr>\n
          10-12 mm<\/td>\n4 x 4 mm<\/td>\n<\/tr>\n
          12-17 mm<\/td>\n5 x 5 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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          Manufacture<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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          Manufacturing of keyways<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          Keyways are produced using different processes depending on part material and quantity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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          Typical manufacturing methods:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          • milling<\/li>
          • broaching<\/li>
          • shaping<\/li>
          • EDM for hardened materials or difficult geometries<\/li><\/ul>


            The process influences accuracy surface quality and cost efficiency.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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            Tools<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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            Keyway tools<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            Different tools are used for machining keyways:<\/p>

            • disc cutters<\/li>
            • slot milling cutters<\/li>
            • broaching tools<\/li>
            • shaping tools<\/li><\/ul>


              The choice depends on material keyway size and production requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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              Disadvantages<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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              Disadvantages of keys<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              Despite their advantages keys also have design limitations.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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              Possible disadvantages:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              • stress concentration in the shaft<\/li>
              • weakening of the shaft cross-section<\/li>
              • limited load capacity due to surface pressure and shear stress<\/li>
              • wear due to micro movements<\/li>
              • limited suitability for highly dynamic applications<\/li><\/ul>


                For very high loads or reversing directions alternative shaft-hub connections may be used.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                Customization<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                Standard meets customization<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                Even with standardized keyways there are individual requirements:<\/p>

                • different torque levels<\/li>
                • special installation situations<\/li>
                • specific mounting conditions<\/li>
                • customer-specific coupling solutions<\/li><\/ul>


                  Through customized machining of keyways shaft couplings can be adapted precisely to the application.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                  In a nutshell<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  Keyways are a proven and cost-efficient solution for torque transmission in shaft couplings and drive systems.<\/p>

                  They combine:<\/p>

                  • fast assembly<\/li>
                  • high operational reliability<\/li>
                  • standardized interchangeability<\/li>
                  • reliable power transmission<\/li>
                  • robust function in mechanical engineering<\/li><\/ul>


                    Correct design of keyway tolerance and manufacturing process has a major influence on service life and performance of the connection.<\/p>

                    Often the simpler solutions are the more robust ones.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                    Form-fit connection for safe torque transmission<\/b><\/p>\n

                    In gearboxes, motors and shaft couplings the keyway plays an important role wherever torque must be transmitted reliably.
                    It is one of the most proven shaft-to-hub connections in mechanical engineering and ensures safe standardized and cost-efficient power transmission.
                    In drive technology the keyway is widely used because of its simple design high interchangeability and precise function. Despite modern connection technologies it remains a standard solution in many applications. <\/p>\n","protected":false},"author":1,"featured_media":17050,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[106],"tags":[],"class_list":["post-16830","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-shaft-couplings-3"],"acf":[],"yoast_head":"\nKeyway in shaft couplings - abp Antrieb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.abp-antrieb.de\/en\/blog\/shaft-couplings-3\/couplings-torque\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Keyway in shaft couplings - abp Antrieb\" \/>\n<meta property=\"og:description\" content=\"Form-fit connection for safe torque transmission In gearboxes, motors and shaft couplings the keyway plays an important role wherever torque must be transmitted reliably.It is one of the most proven shaft-to-hub connections in mechanical engineering and ensures safe standardized and cost-efficient power transmission.In drive technology the keyway is widely used because of its simple design high interchangeability and precise function. Despite modern connection technologies it remains a standard solution in many applications.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.abp-antrieb.de\/en\/blog\/shaft-couplings-3\/couplings-torque\/\" \/>\n<meta property=\"og:site_name\" content=\"abp Antrieb\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-15T12:54:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-23T06:58:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.abp-antrieb.de\/wp-content\/uploads\/2026\/05\/blog-passfedernut.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"1200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ralf\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ralf\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/\"},\"author\":{\"name\":\"Ralf\",\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/#\\\/schema\\\/person\\\/31a7a081deb7411c667678d64068359c\"},\"headline\":\"Keyway in shaft couplings\",\"datePublished\":\"2026-06-15T12:54:02+00:00\",\"dateModified\":\"2026-06-23T06:58:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/\"},\"wordCount\":620,\"publisher\":{\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.abp-antrieb.de\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/blog-passfedernut.png\",\"articleSection\":[\"Shaft couplings\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/\",\"url\":\"https:\\\/\\\/www.abp-antrieb.de\\\/en\\\/blog\\\/shaft-couplings-3\\\/couplings-torque\\\/\",\"name\":\"Keyway in shaft couplings - 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