GB/T 25318-2019 Locking devices for ball and socket couplings of string insulator units—Dimensions and tests

Scope

This standard specifies the shape and standard dimensions of locking pins, test methods, judgment criteria, and other dimensions provided solely as a guide for manufacturing.
This standard applies to the ball-and-socket connections of insulator string components in GB/T 4056 and the locking pins supplied separately with corresponding metal accessories. When these locking pins are supplied together with insulators or metal accessories, they shall be considered an integral part of the insulators or metal accessories. In this case, the relevant tests should be included in GB/T 1001.1. When required, a certificate of conformity should be provided to prove that the locking pins have been tested in accordance with the provisions of this standard. Locking pins are usually supplied together with insulators or corresponding metal accessories.
This standard does not include technical requirements for materials, but it is recommended that the surface of the materials should not have an anti-corrosion layer. In addition, the materials should not cause significant contact corrosion (chemical reaction) between the locking pins and the ball-and-socket connections.

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