nose bit

A nose bit is a drilling tool with a flat, angled cutting surface on one side of its tip, designed to bore holes and cut a shoulder or undercut within the hole. Unlike a standard twist bit that spirals to the center point, a nose bit has a pronounced asymmetrical tip: one side is sharp and beveled, while the other side extends slightly longer. This geometry lets it cut perpendicular to the hole axis, useful for creating step drills, recesses, or blind pockets where a shoulder must be cut at a precise depth.

The tool is driven by a brace or hand drill in traditional carpentry, or by a drill press for production work. The operator positions the bit to the required depth, and the side cutting edge shears wood fibers parallel to the bore axis as the bit rotates. The design makes it particularly valuable for creating the recessed holes needed for wood screws with cup washers, or for undercutting around a dowel hole to create a mechanical lock.

Common forms and limitations

Nose bits are typically made with a steel shank and cutting edges hardened to between 45 and 55 HRC. Sizes range from about 1/4 inch to 1 inch in diameter. The tool requires steady hand control or rigid machine mounting, as the off-center cutting action can produce torque that twists the work if held loosely. Feed pressure must be consistent to avoid tearout on the side cut, especially in figured or cross-grain timber.

The nose bit has declined in general use since the rise of forstner bits, which offer better control and cleaner flat-bottomed holes. However, it remains useful in situations where undercutting or a specific shoulder profile is needed, and where the expense or size of a forstner bit is unwarranted. The term appears less often in modern manuals but is still recognized among hand-tool carpenters and those working with vintage equipment.