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The surface area of a fastener which contacts the top surface of the sheet material. See: positive stop.
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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.
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A shoulder is an enlarged portion of the body of a threaded fastener or shank of an unthreaded fastener.
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The part of the ring that extends from the shank to the center of the setting.
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The sides of the ring that extend from the shank to the centrepiece
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The part of a ring between the shank and the center of the setting.
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