WHAT IS A TOLERANCE RING?
WHY USE A TOLERANCE RING?

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Hard Disk Drive - Comparative Solutions

 
Spring Clip
Set Screw
Adhesive
Tolerance Ring
Component Cost
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tick
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Assembly Cost
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tick
cross
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Torque Ripple
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cross
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Resonance
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cross
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Ease of re-work
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cross
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Cleanliness
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Animations / Video

Assembly - Tolerance Ring (Quicktime, 2.4MB)
Assembly - Adhesive (Quick time, 2.8MB)
Resonance - Tolerance Ring vs set screw (Quick time, 6.5MB)
Rework and Disassembly - Tolerance Ring vs adhesive (Quick time, 2.5MB)

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Tolerance Rings are radial spring fasteners
that are press fitted between two mating components. This generates a retention force that fixes those components together, whilst also satisfying other functional requirements such as Torque Drive, Overload Protection, NVH Performance and Differential Thermal Expansion.


Fasten annular components
Reduce noise & vibration
Compensating for thermal expansion
Predictable & repeatable slip
Avoid resonance frequencies
Overload protection