Special Features:

1.125 in. Lg o/a; hex head 0.500 in. Wd across flats, 0.219 in. Thk, head concaved 0.438 in. Wd by 0.125 in. Deep; thd data 0.375-24 unf, 0.500 in. Thd lg, external relieved body 0.188 in. Diameter by 0.156 in. Lg; thd data 0.375-24 unf by 0.250 in. Lg; thd end internally relieved body 0.188 in. Id by 0.188 in. Deep, 0.125 in. Id by 0.500 in. Deep, 0.078 in. Id by 0.250 in. Deep

Properties:

An externally threaded screw-like device with a hexagon, square, slotted or any other type drive end. The other end may have a spherical ball, socket or other type of machined surface. It may have a concentric hole along the longitudinal centerline and a hole perpendicular to the axis joining the concentric hole for lubrication. It is specifically designed to be used as a means for adjusting engine poppet valve tappet clearances and may be furnished with a lock nut.