10-9X2 1/2 6 Lobe Flat Nibs Coarse Thread Type 17 Exterior Screw Partial Thread Zinc Yellow (Pack Qty 1,500) BC-1040DTF17Y

An externally threaded fastener with a countersunk head, six-lobed recess, a single lead thread. The shank has a reduced diameter and a chip cavity cut out where the final several threads end at the tip The deeper thread design offers greater resistance to pull-out forces. The six-lobe recess transmits drive torque with less required downward pressure