Reliable Fractional Drill Bit Sets for Shops

A fractional drill bit is sized in inches using fractions, such as 1/16, 1/4, 3/8, or 1/2 inch. These bits are commonly used in U.S. industrial, maintenance, and fabrication settings where drawings, fasteners, and hole specifications call for inch-based dimensions. A fractional set groups multiple common sizes in one indexed case for convenient selection and storage.

Fractional drill bit sets typically include common inch increments ranging from small sizes such as 1/16 inch up to larger sizes such as 1/2 inch, though the exact range and increments vary by set. Sets may advance in 1/64-inch, 1/32-inch, or larger increments. Review the indexed size list before ordering to ensure it covers the hole diameters your shop uses most.

For metal drilling, durability depends on the bit material, coating, geometry, and the metal being drilled. High-speed steel is a common general-purpose choice, while cobalt-bearing bits are often selected for tougher alloys and higher-heat applications. Proper speed, steady pressure, secure workholding, and cutting fluid where appropriate also greatly affect bit life and drilling performance.

Yes. A 1/2-inch drill bit is a standard fractional size and is commonly included in larger fractional drill bit sets. Before using it, confirm that your drill chuck, arbor, or tool setup accepts the bit’s shank diameter. For larger holes in metal, a drill press, secure workholding, appropriate speed, and cutting lubricant can help produce cleaner results.

Start with the materials you drill most often, the hole sizes required by your work, and the capability of your drill equipment. General shop work may call for broad high-speed-steel coverage, while repeated metal fabrication may justify a set designed for greater heat resistance. Also consider case organization, replacement needs, and whether your team regularly uses inch-based specifications.

Many general-purpose fractional drill bits can drill wood and plastic, particularly when clean, accurate holes are the goal. Use a sharp bit and select a speed appropriate to the material; excessive speed can melt some plastics or create rough edges. For specialized woodworking tasks, brad-point, spade, or Forstner bits may provide a better finish than a standard twist bit.

Store bits in their labeled case so sizes remain easy to identify and cutting edges are protected. Wipe away chips, oil, and moisture after use, and replace or resharpen worn bits before they damage workpieces. Avoid forcing a dull bit through material, as heat and excessive pressure can shorten its life and reduce hole accuracy.

Yes. Buster's Industrial Supply supports ongoing industrial purchasing with responsive service, inventory guidance, free stocking programs, and vendor-managed inventory options. These services can help shops maintain access to frequently used drilling supplies and reduce disruptions caused by missing or depleted sizes. The team can also support broader MRO and operational supply needs as your purchasing requirements change.