Depending on the kinds of forces that are acting on the joint and how critical it is to prevent any movement or separation, there are three tightening procedures that take advantage of the pin and spring characteristics of bolts. They are snug-tight, pre-tensioned, and slip-critical. Below is a checklist of the information you need to know for all three tightening procedures. Note that some specifications described in the following content may not be the same as the specifications followed by your agency. Always check with your State agency’s standards and specifications when using these guidelines.