Unbrako

Unbrako has developed and maintained certain manufacturing advantages that continue to set them apart from all competition. The SPS Unbrako unique features and benefits such as all of their socket cap screws have forged heads and hex sockets.  Routine specifications mandate cold or hot-formed heads with all socket cap screws. In all sizes, Unbrako hex sockets can be forged or machined. Consequently, all Unbrako socket cap screws heads and their sockets are forged. During the forging process, the flow lines of the material are made stronger, and this results in a better installation ability and a longer product life. 

Furthermore, all Unbrako socket cap screws have rolled threads.  The system standard specifications mandate rolled threads through 5/8 " diameter and for screw lengths through 4", or respectively with metrics requiring roll threads through M24 diameter, and product lengths up to 150 mm inclusive. Unbrako provides that larger products may be rolled, cut, or ground at the option of the manufacturer. Cut threads interrupt the grain flow of the material and can cause weakness. Conversely, roll threading compresses the grain and is a benefit to product strength. Due to these benefits, all Unbrako cap screws are roll threaded.