2.125" center hole diameter a second set of holes; two holes with a 0.250-20unc-3b thru csk 90 degrees plus or minus 10 degrees by 0.28" plus or minus 0.01" 0 anodize surface treated
2.873" center hole diameter two bolt holes with 0.250-20unc-3b thru countersunk 90 degrees plus or minus 10 degrees by 0.28" plus or minus 0.01" diameter anodize surface treated
2.375" center hole diameter a second bolt hole is located on bolt circle 4.250" diameter with a diameter of 0.281" thru 0 phosphate manganese surface treated
1.009" center hole diameter acft model HU25a motor unit assy, includes three slots 0.375 in.lg; dia.1.315 in.; groove around circumference on one end 0.062 in.dia.
