• TightFit® threaded shank drill bits are made of M2 or M7 high-speed steel, for drilling hard, tough materials.
• With a 135 degree split-point, 1/4-28 threaded shank and a 5/16″ hex adapter for easy removal.
• TightFit® threaded shank drill bits are black oxided to add lubricity, prevent corrosion while enhancing appearance.
• These drill bits comply with National Aerospace Standards.

Five aircraft quality precision twist drill bits in the following drill diameters: 3/32, 1/8, 5/32, 3/16 & 1/4 inches. The overall length, not including the threads, is 1/2 – 5/8″. All TightFit® threaded shank drill bits are black oxided to add lubricity, prevent corrosion while enhancing appearance.

The drill bits comply with National Aerospace Standards. The Standard provides the following description, “A special short flute, heavy duty drill designed for drilling the hard, high strength alloys used in aircraft manufacturing.” The drill bits are made from M2 or M7 tool steel with self-centering, 135 degree, P3 split points and a Rockwell C scale hardness of 63.5 to 66. They are manufactured as right-hand tools with 5/16″ hex wrench flats and 1/4-28 UNF-2A threads. TightFit® threaded shank drill bits are concentric, self-tightening, non-slipping, long life tools designed for work in limited space situations.

TightFit® threaded shank drill bits WORK EQUALLY WELL IN METAL, WOOD OR PLASTIC.