13/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number CTH3812

Part Number CTH3812

Part Number: 87C300HSBA325G/PT

Size: 1 Ounce

Size #6-36

to 52–56 HRC to make the shank strong without being brittle • Durable

13/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number CTH3812Product Description Counterboring 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