Roll threading is a cold forming process where a blank  having an outside diameter between the major and minor diameters of the finished thread is rolled between hardened steel dies. The dies penetrate the blank to form the thread roots, and displace material radially outward to form the crests.

 Unlike cut threading, metal is neither removed nor wasted, but displaced. The cold forming process strengthens the threads in three ways: tension, shear, and fatigue resistance.

The grain structure of the thread is not cut. (See the below macrograph) Instead it is reformed in continuous unbroken lines following the thread contours. Rolled threads have increased resistance to stripping because  of the improved grain flow.

Cut threading is a process where material is removed  or cut away from a round bar. Cut threading is advantageous for short runs, large diameter bolts, and some special materials. Cut threading has a shorter set-up but longer threading time per bolt. 

Whitelaw Rigging/Anchor Bolt offers roll thread bolts in 5/8”, 3/4”, 1” and 1-1/4” diameters. All standard diameters are available cut thread.  Both cut and roll threaded bolts meet current ASTM standards for non-headed bolts.