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Why is there are difference between smooth shaft and screw jack (ACME screw) shafts?

Supplier: Bellowflex Australia
30 September, 2009

For smooth shaft applications the inside diameter of the bellow can be 1 or 2mm larger than the shaft diameter.

For the screw jack application you require a larger clearance between the shaft and the inside diameter of the bellow,
(generally we would allow 6mm) as the bellow may get caught on the thread of the screw and hence damaging the bellow or the equipment.