Two Vislok Patent Safety Lock Nuts

Two Vislok Patent Safety Lock Nuts, viz: - (1) 1" No.1 and (2) 3/8" No.5

This lock nut, known as the "Vislok," is in two inseparable parts capable of relative rotation, as patented in 1910 by Mr. W. C. Peters. The upper part of the nut has a conical seating in the lower one, which dove-tails into the undercut edge of the upper part. A line is stamped across the junction of the parts and the whole nut tapped as usual. In screwing on to the bolt, a spanner rotates both parts together in line. To lock the nut, the top half is rotated relative to the lower. Not only does this give the wedging action of ordinary double nuts, but it introduces also a radial pressure due to the wedging of the dovetail; it is claimed that this renders the nut immovable. The thread is not damaged and the nut can be used repeatedly.