6-13X1 1/4 #2 Square Recess Flat Head No Nibs Deep Thread Type 17 2/3 Thread Zinc (Pack Qty 5,000) BC-0620DQF17NN

The deeper thread design offers greater resistance to pull-out forces. The chip cavity (or auger point) enables the fastener to drive—especially in denser woods—without pre-drilling a pilot hole C1022 case-hardened steel Rockwell C 45 minimim