{"id":3895,"date":"2026-04-13T10:54:02","date_gmt":"2026-04-13T08:54:02","guid":{"rendered":"https:\/\/fey-lamellenringe.de\/fk-4\/"},"modified":"2026-08-17T13:26:51","modified_gmt":"2026-08-17T11:26:51","slug":"fk-4","status":"publish","type":"page","link":"https:\/\/fey-lamellenringe.de\/en\/laminar-rings\/piston-rings\/fk-4\/","title":{"rendered":"FK 4"},"content":{"rendered":"\t\t
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FK 4<\/strong><\/h1>\n\t\t\n<\/div>\n\n<\/div>\n
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fk 4<\/h2>\n\t\t\t\t\t

Laminar piston rings for Freeform and drop forging \u00ad hammers, presses and control slides<\/p>\n\t\t\n<\/div>\n

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FK 4 Laminar piston rings<\/p>\n\t\t\t\t\t

FK 4 laminar sealing rings for pistons in freeform\/drop forging machines, presses and control slides.<\/p>\n\t\t\t\t\t

Please contact our technical office for information about ring dimensions, ring materialsand groove geometries.<\/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>SPRING RESISTANT UP TO<\/th>HARDNESS VALUE<\/th>SURFACE PROTECTION<\/th>SURFACE COLOUR<\/th><\/tr><\/thead>
C75<\/td>max. +300\u00b0C <\/td>On request1)<\/sup><\/td>Oiled<\/td>Varies 2)<\/sup><\/td><\/tr>
C60S<\/td>max. +300\u00b0C <\/td>On request1)<\/sup><\/td>Oiled<\/td>Varies 2)<\/sup><\/td><\/tr>
51CrV4<\/td>max. +400\u00b0C <\/td>On request1)<\/sup><\/td>Oiled<\/td>Varies 2)<\/sup><\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t

1)<\/sub> 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 thermal treatment from silber\/bluish to brownish\/black.<\/p>\n\t\t\n<\/div>\n

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Freeform\/drop forging machines<\/strong><\/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 desired sealing effects can be achieved.<\/p>\n\t\t\t\t<\/div>\n\t\t

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

Order information:<\/strong>For enquiries and\/or orders for all ring types, the ring diameter specifications must correspond to the housing or shaft diameter exactly.<\/p>\n\t\t\t\t<\/div>\n\t\t

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

<\/p>\n\t\t\t\t<\/div>\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 4 fk 4 Laminar piston rings for Freeform and drop forging \u00ad hammers, presses and control slides FK 4 Laminar piston rings FK 4 laminar sealing rings for pistons in freeform\/drop forging machines, presses and control slides. Please contact our technical office for information about ring dimensions, ring materialsand groove geometries. Fitting Greasing Ring […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":4314,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3895","page","type-page","status-publish","hentry"],"yoast_head":"\nHydraulic Piston Rings FK 4 | Fey Laminar Rings<\/title>\n<meta name=\"description\" content=\"Einfach gewundene Kolbenringe FK 4 f\u00fcr Hydraulikzylinder. Robuste Metall-Lamellenringe f\u00fcr zuverl\u00e4ssige Abdichtung im Maschinenbau. 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