9/32" X 3/32" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number KFD3F1-3/32

Part Number KFD3F1-3/32

Part Number DWDRSD12

They have a bright finish

The black oxide finish won't flake or chip off

Thread Length 2-9/16"

9/32" X 3/32" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com Part Number KFD3F1-3/32Product 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