Which statement will not prevent tap breakage?

In the context of reducing the likelihood of tap breakage, the statement that the tap drill creates a 95% thread and that the hole is drilled to full thread depth does not contribute to preventing breakage. When a tap drill size is too large, leading to a 95% thread engagement, it increases the potential for insufficient material support, which can create excessive stress on the tap during cutting. Additionally, drilling to full thread depth does not facilitate chip clearance. Proper chip clearance is important because it allows for better flow of the material being cut, reducing the chance of clogged chips which can add stress to the tap and increase the risk of breakage.

Conversely, creating a 75% thread engagement, providing adequate lubrication, and drilling deeper for chip accumulation are methods that help manage cutting conditions. A 75% thread engagement allows for better support of the tap, lubrication reduces friction and wear, and drilling deeper enables chips to be removed efficiently. Hence, the factors mentioned in the correct answer are more aligned with practices that help minimize the risk of tap breakage.