### What is Deep Hole Drilling | UNISIG Deep Hole

2001-6-1 · Typically, a deep hole is defined by the ratio of the diameter to depth. Usually a ratio of 5:1 or greater is considered deep-hole drilling. For example, a 5-inch deep by 1-inch diameter hole is considered deep, as is a 0.125-inch diameter hole that is 1 inch deep.

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