2-1/4" X 1/2" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Part Number D/ASTCO31/64
Description
Part Number D/ASTCO31/64
The blades are hardened to 58 - 64 HRC
Part Number DWDA/CX1229/64
Part Number DWTSH2-1/4-8
3/8 inch to 1/4 inch drive reducer
2-1/4" X 1/2" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com Part Number D/ASTCO31/64Product 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
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