NUT/TINNERMAN/#8 screw size, length .530 inch, width .500 inch, panel thickness .040-.051, U shaped. A1786-8Z1D pack of 100U-type Tinnerman Speed Nuts | #8 Screw, 0.040–0.051in PanelsTinnerman U-type nuts snap into position over a panel’s edge and ideal in blind or hard to reach locations witho..