Beam Lifting Clamp Clamp Type Beam Flange Clamp Material Steel Maximum Jaw Opening 12 in Minimum Jaw Opening 4 in Working Load Limit 20 000 lb Attachment Type Shaft Maximum Beam Thickness 1 in Compatible Beam Shape Flat Minimum Beam Thickness 4 in Attachment Diameter 1 1/4 in Beam Mount Location Bottom Top Maximum Beam Width 12 in Minimum Beam Width 4 in Overall Depth 4 1/4 in Overall Width 19 3/4 in Standards ASME B30.16 ASME B30.20 ASME BTH-1