Precision Twist SPS-90 1/2X3 3/4 90 Degree Bright High Speed Steel Spotting Drill 087902

The Precision SPS-90 short-length bit is a round shank, spotting drill bit made of HSS with an uncoated finish and is used for starting a hole. It is suitable for drilling to a depth up to one times the diameter of the drill. The shank diameter is the same as the drill size. It is suitable for drilling to a wide variety of metals and synthetic materials performing best with steel, copper, and aluminum magnesium. The SPS-90 series with a 90-degree conventional point geometry should only be used to start holes; do not go deeper than the diameter of the drill bit. The 90-degree point angle in better suited for softer materials or using a drill with a smaller drill point angle, such as the 118-degree model. The short length offers and the most rigidity for hole-starting. The uncoated finish helps increase chip flow in soft materials. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. Right-hand twist brings chips up and away from the cutting edge.