The surface area of a fastener which contacts the top surface of the sheet material. See: positive stop.
n: 1. the flat portion machined on the base of the bit shank that meets the shoulder of the drill collar and serves to form a pressure-tight seal between the bit and the drill collar. 2. the portion of the box end or the pin end of a tool joint; the two shoulders meet when the tool joint is connected and form a pressure-tight seal.
A shoulder is an enlarged portion of the body of a threaded fastener or shank of an unthreaded fastener.
The part of the ring that extends from the shank to the center of the setting.
The sides of the ring that extend from the shank to the centrepiece
The part of a ring between the shank and the center of the setting.