5/8" X 1/8" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com to ensure the highest standards

to ensure the highest standards of dimensional accuracy and consistency • Corrosion-Resistant – We coat all of our keys with a durable manganese phosphate finish that's resistant to corrosion Clear Markings – With the exception of the smallest sizes

ensuring that it won't slip or skip under stress • Proof Torque – Our ratchets meet (and most far exceed) the industry standard for Proof Torque

Part Number: 75C225HCSSS/316

Tap Drill Size #66

Size: 1/4"

5/8" X 1/8" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com to ensure the highest standardsProduct 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