Bolt tensioners are devices designed to put in a precise tension to a bolt – a form of threaded fastener. They put in force to maintain or create tension. Bolts are especially beneficial when dealing with larger steel and lumber, due to its wider flexibility of length, strength, and capacity to more or less permanently fasten the joint. Besides the clear strength issue, the problem with screws and nails is the formidable eventuality of them becoming loose after some time, and endangering the strength of joints. This is particularly true if joints are subject to movement and vibration.
http://www.thegreenbook.com/products/bolt-tensioners/
|