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Technische Handelsonderneming Nederland b.v.

Postbus 390
7500 AJ Enschede
T. +31 (0)53 432 34 46
F. +31 (0)53 430 71 58
Technische Handelsonderneming Nederland b.v.

Postbus 390
7500 AJ Enschede
The Netherlands
T. +31 (0)53 432 34 46
F. +31 (0)53 430 71 58
E. info@thn.nl

Office:
H. ter Kuilestraat 30
7547 BD Enschede
The Netherlands

FK7 - Single- and double-wound laminar retainer rings


FK7 Applications

Fey FK7 rings are steel retainer rings/locking rings. They are available both as single-wound and double-wound versions. The rings are used for securing components axially for transmission systems, agricultural implements and for securing parts in the automotive industry. They are also used in roller bearings for the shipping and aviation industry, and for winches.

For installation purposes, different versions are available with straight butt, oblique butt or recess.

Advantages of the double-wound types

Advantages of the double-wound types include:


Types

Implementation Description
FK7 ESB Single-wound retainer ring for bores (externally tensioned)
FK7 ESW Single-wound retainer ring for shafts (internally tensioned)
FK7 DSB Double-wound retainer ring for bores (externally tensioned)
FK7 DSW Double-wound retainer ring for shafts (internally tensioned)
FK7 DMS Double-wound retainer ring for shafts with centrifugal force protection (internally tensioned)

FK7-ESB Detail FK7-ESW Detail FK7-DSB Detail FK7-DSW Detail FK7-DMS Detail
FK7-ESB FK7-ESW FK7-DSB FK7-DSW FK7-DMS

Materials

Material Temperature Surface treatment Colour
C75S DIN 1.0605 max. +300°C oiled varying ¹)
C60E DIN 1.1221 max. +300°C oiled varying ¹)
50CrV4 DIN 1.8159 max. +400°C oiled varying ¹)
CrNi DIN 1.4310 max. +450°C bright and dry varying ¹)

¹) The colour of the laminar rings may vary between silver, light brown and black as a result of the heat treatment.

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