1/2 HEX SOCKET SHOULDER SCREW1/2 HEX SOCKET SHOULDER SCREW 74040,25 PER BOX,2.25"LENGTH UNDER HEAD, 3/8-16, 1/4 HEX KEY 1/2" Nominal Shoulder Dia., 2-1/4" Shoulder Length, .750"-.729" Max/Min Head Dia., .312"-.302" Max/Min Head Hgt., 1/4" Hex Socket Key Size, 3/8-16 Basic Thread Size, .625" Thread Length. These are a socket head shoulder screws, but they are also called shoulder bolts or stripper bolts, and are made to ASME B18.3 Standards. They have a tensile strength of 140,000 PSI minimum in the shoulder and thread neck area. They also have a minimum of 84,000 PSI shear strength in the thread neck area. And they have a broad Rockwell "C" hardness of 32-43 on the surface. These bolts are for rotation or sliding applications, such as pulley shafts, die making, punch design, bearing pins and especially in pivot point area's.
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