A Partial Threaded Hex Bolt is a type of fastener that has threading on only a portion of its length, with the unthreaded portion (shank) allowing for additional strength and a stronger grip in the material being fastened. The hexagonal head allows for easy tightening using a wrench or socket. The threaded part of the bolt engages with the nut or threaded hole, while the unthreaded portion provides added stability and resistance to shear forces. ... Partial threaded hex bolts are used in applications where full thread engagement is not necessary but where the benefits of having a strong, stable connection with a portion of the bolt still threaded are desired. They are commonly used in machinery, automotive, construction, and structural applications