A method to accurately determine and assure proper clamping force or bolt tension in fastening systems comprises statistically sampling washer or flanged bolt lots for clamping force versus deflection relationships, encoding the lots and subsequently installing the fasteners to the prescribed deflections...http://www.google.es/patents/US5615575?utm_source=gb-gplus-sharePatente US5615575 - Drive tool with sensor for fastener deflection during tightening and clamping force validator
Drive tool with sensor for fastener deflection during tightening and ...
