The 100761040 Single-claw Flange Clamp is used to join a size NW400 or NW500 ISO-MF vacuum flange to an M12 tapped flange. Series 76 single claw clamps feature stainless steel bolts and washers with an aluminum flange clamp designed for ISO-MF flanges. ISO flanges and seals are designed to be tightened to metal to metal contact. It is important that the clamps or bolts not be over tightened or warping of the flanges could result. The torque rating for clamps and bolts is 7 to 10 pounds per foot.