The strain clamp is tension hardware that used for completing the tensional connection on a conductor or cable, and it provides mechanical support to the insulator and conductor. It is usually used with fitting like clevis and socket eye on the overhead transmission lines or distribution lines.

Bolted type strain clamp is also called dead end strain clamp or quadrant strain clamp.

Depending on the material, it can be divided into two series:  NLL series strain clamp is made of aluminum alloy, while the NLD series is made of malleable iron.

NLL strain clamp can be classified by the conductor diameter, there are NLL-1, NLL-2, NLL-3, NLL-4, NLL-5 (the same for the NLD series).

Strain Clamps are recommended for ACSR or all aluminum conductor. The clamp bodies and keepers are manufactured from lightweight, high strength A356-T6 aluminum alloy. U-Bolts, nuts, lock washers and clevis pins are hot dip galvanized steel. Humpback cotter keys are stainless steel.