AS/NZS 4100 specifies conditions for the application of high strength structural bolts in both friction type and bearing type joints
High strength structural bolt has a large bolt head and nut as it is designed to withstand full tensioning
8.8/S High strength structural bolts fully tensioned bolts that are used snug tight
8.8/TF High strength structural bolts fully tensioned friction type joint
8.8/TB High strength structural bolts fully tensioned bearing type joint
8.8/TF & 8.8TB bolts as fully tensioned to the requirements of AS/NZS 4100. Cost of tensioning is an important consideration in the use of these bolting categories