Precision Twist Drill 5999534 R56 Series 7/8" Reduced Shank Drill Bit HSS

The Precision Twist Drill 5999534 is a Series R56 Reduced Shank Drill Bit engineered for demanding metalworking and machining applications. With a 7/8" cutting diameter and a 1/2" reduced shank, this bit fits into standard 1/2" chucks while still delivering large-diameter hole-making capability — no special chuck required.

Constructed from High-Speed Steel (HSS) with a Black Oxide finish, this drill bit offers excellent heat resistance, wear durability, and lubricity for extended tool life. The 118-degree point angle provides reliable centering and cutting performance across a wide range of materials including mild steel, cast iron, aluminum, and other common metals.

Key Specifications:

• Drill Diameter: 7/8"
• Shank Diameter: 1/2" (Reduced Shank)
• Overall Length (OAL): 6"
• Flute Length: 3"
• Point Angle: 118 degrees
• Flute Type: Straight-Cylindrical
• Cut Direction: Right Hand Cut
• Material: High-Speed Steel (HSS)
• Finish: Black Oxide
• Series: R56

The reduced shank design makes this bit highly versatile, allowing use in standard 1/2" drill chucks found on most bench-top and portable drill presses. Precision Twist Drill is a trusted brand under Dormer Pramet, with a long-standing reputation for precision-engineered cutting tools used in aerospace, automotive, and general manufacturing environments.