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7/8" X 1/4" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Tap Drill Size 3-1/4"

SKU 39717880613
4.6
Description

Tap Drill Size 3-1/4"

non-ferrous alloys

The BoltsandNuts

Part Number DWC5-530-501

7/8" X 1/4" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Tap Drill Size 3-1/4"Product 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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