Bolted Type Tension Clamps are used for sub-station and medium voltage transmission systems. Century Extrusions Ltd. Is an ISO 9001-2008 awarded company that manufactures Bolted Type Tension Clamps. The other products manufactured by Century Extrusions Ltd. Include Helical Fittings, LT Connectors, LT Line spacers and Vibration Dampers. Bolted Type Tension Clamps are manufactured from Aluminium alloy by Gravity casting. These are available for various sizes of conductors. `U` Bolts and nuts are made of HDG mild steel. To reduce power losses, the same can also be made from stainless steel.