Anika's FAQs

Fully Threaded Bolts & Unthreaded Shanks

When a fully threaded bolt is specified, how much of an unthreaded shank is allowed?

Fully threaded bolts are often referred to as “tap bolts”. The unthreaded portion of a bolt is often referred to as the “grip”. ASME B18.2.1 is the dimensional standard that covers hex, heavy hex, and square head bolts as well as lag screws. This specification states for fully threaded bolts and lag screws that are... Read more