steel,mil-s-6758,cond normalized; 0.760 in. min 0.790 in. max lg; 0.340 in. min 0.370 in. max thk; u shaped opening 0.680 in. lg by 0.380 in. min 0.410 in. max w spaced 0.175 in. min 0.205 in. form edge; curved channel in base edge 0.190 in. r; chamfered 0.040 in. by 45.0 deg two corners general characteristics item description