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Double Head Screw types


There are many kinds of anti-theft bolts, but not many are really used in engineering. The anti-theft bolts consist of standard hexagonal screws, standard hexagon nuts, special round nut (outer circle) and pins. The inner side of the nut is axially machined with nails, and a groove matching the pin is axially machined inside the outer round nut.
Use method is:
1) Install a standard hex screw and tighten the standard hex nut with a wrench.
2) Hand-screw the special round nut.
3) Insert the pin between the outer round nut and the screw, and at the same time, break the screw thread through the pin.


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