Quick answer
Disc springs in a stack need clearance to move, but the clearance must be controlled. If the gap is too large, the stack can tilt, rub and load unevenly. If the gap is too tight, coating thickness, heat expansion, contamination or surface roughness can make the stack stick.
Guidance can be provided by a center bolt, shaft, pin, sleeve or housing, depending on which diameter is easiest to control in the assembly.
What goes wrong with poor clearance
Large clearance may lead to tilting, eccentric loading, local contact damage and unstable load output. Very small clearance may increase friction, especially when the part has plating, coating, temperature growth or contamination.
For high-load stacks, valve packs and vibration-prone equipment, clearance should be discussed with stack height, surface finish and lubrication rather than treated as a simple drawing note.
Data to send for guidance review
Useful RFQ data includes inner diameter, outside diameter, guide shaft or sleeve size, stack method, installed height, working height, temperature, media and cycle condition.
These details help FeTech judge whether the stack has enough freedom to move while staying aligned under load.
Frequently Asked Questions
Why should disc spring guidance clearance not be too small?
Too little clearance can increase friction and sticking risk, especially with temperature change, coatings or assembly tolerance.
What happens if guidance clearance is too large?
The spring or stack may tilt, wear locally, misalign and produce uneven load.
How do you choose shaft guidance or sleeve guidance?
Use the guidance method that best matches the equipment structure, available space and controlled diameter.
Need FeTech to review your disc spring application?
Send the drawing, stack envelope, load target, temperature, media and quantity. Our team can check material direction, stack logic and quotation readiness.
- DIN 2093 replacement or custom geometry
- Valve, flange, actuator and severe-service stacks
- Material review for stainless, Inconel, Hastelloy, titanium or heat-resistant steel
Final geometry, fatigue life, K4 source, friction and support-face conditions still require engineering confirmation.