683546

Shoulder eyebolt is a #½-13 x 3.9687 in 1030 carbon steel, self-colored, fully thread UNC/UNF 2 and it is used for direct drive ventilation units. For domestic, shoulder eyebolt tapped holes are to have a threaded length which allows for full length of shank engagement and clearance for the unthreaded portion of shank, shoulder eyebolts must be firmly seated and flush against the mating surface, otherwise, the rated capacity is reduced significantly which meets ASTM-a489;ANSI b18.15.