9steel astm a108 grade 1018, w/shoulder1.250 in. Diameter 0.380 in. Thk, shank 5.500 in. Lg 0.927 in. Diameter w/0.125 in.Min 0.140 in. Max cotter pin hole 0.380 in. From end of pin, loop 0.188 in.Dia on shoulder of pin, pin connected to pushing knee w/steel chain