A heavy duty aluminium clamp for combinations of aluminium and A.C.S.R. Conductors. The massive design and generous centre spacer provide maximum overload protection. Tapered bell mouths and fee grooves combine to minimise cold flow, eliminate conductor chafing and produce a wiping action with the clamped conductors. Clamp components are cast in high strength aluminium alloy. U-Bolts, nuts and spring washers are stainless steel.