An improved clamp for hoses and other tubular members includes two rigid clamping members having semi-circular recesses, one or more annular wedge-shaped grooves in the recesses, and fasteners. An elastomeric insert, or a pair of inserts, has one or more ribs shaped to fit the groove or grooves. The rib height is less than the groove depth leaving an annular gap to improve the clamping action. Inserts of different thickness can be provided to accommodate hoses of different dimensions.