- Ideal for drilling in mild steels where extra length for reach is required. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow. Manufactured to National Aerospace Standard 907.
- Ideal for drilling in mild steels where extra length for reach is required. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow. Manufactured to National Aerospace Standard 907.
- Designed for drilling in brick, concrete, and sandstone. They are larger than the nominal drill sizes to provide clearance for installation of anchor screws.
- Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1/8" or less), the operations is usually known as spot-facing (for bolt head or nut). Otherwise, it is called counterboring.
- A countersink is a tapered hole drilled with a wide outer portion. By comparison, a counterbore makes a flat-bottomed hole that might be used with a hex-headed capscrew. A countersink may also be used to remove the burr left from a drilling.
- Designed for drilling hardened steels in the range of 45-65 Rc. Run at 75 to 100 surface feet per minute with steady hand feed. Note: Sizes under 11/64" are solid carbide spade construction.
- Ideal for drilling in tough, high tensile strength materials. They are precision ground for a high degree of concentricity between shank and body diameter. Shank has triangular-shaped design.
- Ideal for drilling in tough, high tensile strength materials. They are precision ground for a high degree of concentricity between shank and body diameter.
- The shorter flute and overall length increase the rigidity, resulting in less deflection, better hole accuracy, and longer tool life. Sizes smaller than 1/16 and larger than 1/2 have the 118º standard point.
- These are made for solid carbide and are designed for drilling abrasive materials or in high temperature applications. Used on cast iron, high silicon aluminum, copper, plastics, bronze, hard rubber, plexiglass, and other similar materials.
