{"id":3948,"date":"2026-04-14T10:26:05","date_gmt":"2026-04-14T08:26:05","guid":{"rendered":"https:\/\/fey-lamellenringe.de\/fk-9\/"},"modified":"2026-08-17T13:45:43","modified_gmt":"2026-08-17T11:45:43","slug":"fk-9","status":"publish","type":"page","link":"https:\/\/fey-lamellenringe.de\/en\/laminar-rings\/wave-springs\/fk-9\/","title":{"rendered":"FK 9"},"content":{"rendered":"\t\t
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FK 9 WF<\/strong><\/h1>\n\t\t\n<\/div>\n\n<\/div>\n
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fk 9 WF<\/h2>\n\t\t\t\t\t

Wave spring as an axial length compensator (axial spring) for static applications<\/p>\n\t\t\n<\/div>\n

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FK 9 wave spring<\/p>\n\t\t\t\t\t

The wave spring is a compact axial spring that gets its spring properties from its wave shape.<\/p>\n\t\t\t\t\t

The FK 9 wave spring is primarily used for tensioning and adjustment in applications with high temperatures. This makes it suitable for use in exhaust gas connectors, for example. An FK 5 HFL Fey laminar ring can be clamped in place here to cover the sealing gap of the plug-in connector. The resulting double sealing line can reduce leakage. <\/p>\n\t\t\t\t\t

The FK 9 wave spring is primarily used for tensioning and adjustment in applications with high temperatures. This makes it suitable for use in exhaust gas connectors, for example. An FK 5-HFL Fey laminar ring can be clamped in place here to cover the sealing gap of the plug-in connector. The resulting double sealing line can reduce leakage <\/p>\n\t\t\n<\/div>\n

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tFitting<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/path><\/path><\/path><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tGreasing<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n
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Ring materials<\/h2>\n\t\t\t\t
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STEEL GRADE<\/th>\nSPRING RESISTANT UP TO<\/th>\nHARDNESS VALUE<\/th>\nSURFACE PROTECTION<\/th>\nSURFACE COLOUR<\/th>\n <\/tr>\n <\/thead>\n
C75<\/td>\n max. +300\u00b0C <\/td>\n On request1)<\/sup><\/td>\n Oiled<\/td>\n Varies 2)<\/sup><\/td>\n <\/tr>\n
1.4310<\/td>\n max. +450\u00b0C <\/td>\n On request1)<\/sup><\/td>\n Dry<\/td>\n Varies 2)<\/sup><\/td>\n <\/tr>\n
1.4571<\/td>\n max. +500\u00b0C <\/td>\n On request1)<\/sup><\/td>\n Dry<\/td>\n Varies 2)<\/sup><\/td>\n <\/tr>\n
1.4980<\/td>\n max. +700\u00b0C <\/td>\n On request1)<\/sup><\/td>\n Dry<\/td>\n Varies 2)<\/sup><\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t

1<\/sup>) Varies depending on the type of thermal treatment! Hardness values depending on ring cross-section measured in Rockwell HRA or HRC.
2<\/sub><\/sup>) The surface colour can vary depending on the type of heat treatment from bright silver\/bluish colour to brownish\/black.<\/p>\n\t\t\n<\/div>\n

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Sample applications:<\/strong>Please note:<\/strong> The use of FK 9 wave springs is limited to static applications only!<\/p>\n\t\t\t\t\t\"\"\/\t\t\t\t\t

Run and installation tests:<\/strong>Run and installation tests under operating conditions must be performed in each case before standard production of our laminar rings can begin to determine whether the selected installation space is sufficiently large, based on the assumed thermal expansion.<\/p>\n\t\t\t\t<\/div>\n\t\t

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 <\/strong><\/p>\n\t\t\t\t\t\"\"\/\t\t\t\t\t

Thermal expansions:<\/strong>Temperature and material-dependent thermal expansions and, in some cases, geometric deformations of the components must be taken into account and included in the design. These values must be known in order to prevent the parts from blocking during operation. For more information, please contact our technical office. <\/p>\n\t\t\t\t<\/div>\n\t\t

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 <\/strong><\/p>\n\t\t\t\t\t\"\"\/\t\t\t\t\t

Order information:<\/strong>For enquiries and\/or orders, the ring diameter specification must correspond to the housing or bore diameter \u201cD\u2081\u201d exactly. Sealing units each consist of an FK 9 wave spring and a sealing ring (e.g. 1 piece FK 9 WF + 1 piece FK 5-HFL ASD). <\/p>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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All dimensions in mm<\/strong>
Note:<\/strong> Please refer to the information on pages 55, 62, 63, 64 and 65 (questionnaire). For enquiries and\/or orders, please specify the exact bore or housing diameter! <\/p>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

FK 9 WF fk 9 WF Wave spring as an axial length compensator (axial spring) for static applications FK 9 wave spring The wave spring is a compact axial spring that gets its spring properties from its wave shape. The FK 9 wave spring is primarily used for tensioning and adjustment in applications with high […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":4322,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3948","page","type-page","status-publish","hentry"],"yoast_head":"\nWave Washers FK 9 | Fey Laminar Rings<\/title>\n<meta name=\"description\" content=\"Precision FK 9 wave washers for axial play compensation and bearing preload. Reduce mechanical noise and vibration in rotating systems. 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