FK 7 DSW
ESB / ESW /
DSB / DMS
fk 7 DSW
Double laminar retaining rings for shafts
FK 7 DSW double retaining ring for shaft
The double wound laminar retaining rings “FK 7 DSB” for bores and “FK 7 DSW” for shafts are a valuable addition to the “FK 7 ESB” and “FK 7 ESW” single wound laminar retaining rings. The range of applications for double wound laminar retaining rings for bores/shafts includes practically anywhere where components need to be axially limited, fixed and clamped securely, e.g. in gear manufacturing, in construction and agricultural machinery, for fixing elements in automotive and mechanical engineering, in the roller and plain bearing industry, in shipbuilding and aircraft construction, in conveyor belt systems, winches, pulleys, etc.
Advantages of the double-wound laminar retaining rings:
Roundness of the closed helix over 360° ensures firm contact with the groove base and full circumferential closure
- Uniform dynamic weight during rotation
- Higher axial load capacity compared to the “FK 7 ESB” and “FK 7 ESW” single wound laminar retaining rings
Ring materials
| Steel Grade | Spring resistant up to | Hardness Value | Surface Protection | Surface Colour |
|---|---|---|---|---|
| C75 | max. +300°C | On request1) | Oiled | Varies 2) |
| C60S | max. +300°C | On request1) | Oiled | Varies 2) |
| 51CrV4 | max. +400°C | On request1) | Oiled | Varies 2) |
| 1.4310 | max. +450°C | On request1) | Bright and dry | Varies 2) |
1) Varies depending on the type of thermal treatment! Hardness values depending on ring cross-section, measured in Rockwell HRA or HRC.
2) The surface colour can vary depending on the type of thermal treatment from silver/bluish to brownish/black.
Permissible circumferential speed
Running and assembly tests:
Before our laminar rings are used in series production, running and assembly tests must always be carried out under operating conditions to determine whether the retaining rings can withstand the required stress.
Axial load 3)
Axial load 3):
In order to determine the axial load capacity of the retaining rings, shear tests must be carried out under operating conditions. If there are uncontrollable axial impacts between the surrounding components and the laminar rings during operation (coupling effect) or extreme vibration of the components, the secure position of the retaining rings in the groove cannot be guaranteed.
FK 7 DSW ring 4)
Order information 4):
For enquiries and/or orders, please specify the exact shaft diameter “D1”, the operating temperature and shaft rotation speed!
All dimensions in mm, *reinforced ring design
Note: Please refer to the information on pages 13, 62, 63, 64 and 65 (questionnaire).
All dimensions in mm, *reinforced ring design