Abstract: A disc pack includes stacked disc plates defining a first side and second side of the disc pack. Bolt holes extend through the sides of the disc pack and define a bolt circle. Bushings extend through the bolt holes. Each bushing includes a head at a first end bearing against the first side of the disc pack and a second end that extends axially outside the bolt hole. A washer surrounds at least a portion of the second end and bears against the second side of the disc pack to hold the disc plates together. The disc pack is configured to increase from a first diameter defined by the bolt circle to a second diameter defined by the bolt circle that is at least 0.37% greater than the first diameter when the disc pack is pre-stretched.

Abstract: A disc pack includes stacked disc plates defining a first side and second side of the disc pack. Bolt holes extend through the sides of the disc pack and define a bolt circle. Bushings extend through the bolt holes. Each bushing includes a head at a first end bearing against the first side of the disc pack and a second end that extends axially outside the bolt hole. A washer surrounds at least a portion of the second end and bears against the second side of the disc pack to hold the disc plates together. The disc pack is configured to increase from a first diameter defined by the bolt circle to a second diameter defined by the bolt circle that is at least 0.37% greater than the first diameter when the disc pack is pre-stretched.