| 摘要 |
A method for the preparation of hexagonal nuts by cold forming wherein a blank is shaped and formed to a hexagonal configuration wherein the distances across the flats of the hexagon are greater than in the finished nut, and thereafter the rough nut is forced into a shaping die and over a punch concentric therewith, whereby the punch forms the central opening in the nut and the shaping die reduces the distances across the flats of the hexagon to that of the final nut size.
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