Purpose:

This standard specifies the areas to be used in calculating stress or load values to be used in externally and internally threaded fastener procurement specifications for bolts, screws, nuts, and studs and for the information of designers.

Application:

Areas for the UNJ screw thread series per AS8879 normally used for aerospace fasteners (see AS1132) are established for the following conditions:

Bolts, Screws, and Studs:

a. Areas for minimum ultimate shear or load in unthreaded shank.

b. Areas for minimum ultimate tensile stress or load in thread.

c. Areas for stress durability test load in thread.

d. Areas for stress rupture test load at elevated temperature.

e. Areas for tension-tension fatigue test load.

Nuts: Areas for minimum ultimate tensile stress in companion bolt thread.