1-1/8" X 5/16" Pilots for Counterbore - High Performance & Durable Cutting Tool | Drill America Cleaning Supplies Drill America - 11/16-24 UNS

Drill America - 11/16-24 UNS HSS Taper Tap

Choose the Drill America - 5/8-36 UNS HSS Taper Tap for unmatched reliability and performance

Size: 1-1/4"-82

Tap Drill Size: 34

1-1/8" X 5/16" Pilots for Counterbore - High Performance & Durable Cutting Tool | Drill America Cleaning Supplies Drill America - 11/16-24 UNSCounterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and counterbore cutter, and a