To check the integrity of bolted joints the SPC4 load indicating fastener allows constant monitoring of the clamp load, whether static or dynamic. Attaching a probe to the datum disc on the fastener gives a read-out on a hand-held monitor.
Manufacturer Valley Forge & Bolt in Arizona, USA also produces the Maxbolt and Betabolt load indicating fasteners that continually display the amount of tension in a bolt or stud.
