Precision Twist Drill 5998611 R40 15/16 in HSS Screw Machine Drill Bit

The Precision Twist Drill 5998611 is a 15/16 in (0.9375 in) R40 Series General Purpose Screw Machine Drill Bit crafted from high-speed steel (HSS) with a bright finish. Screw machine length (stub) drill bits are shorter and more rigid than standard jobber-length drills, making them ideal for use in screw machines, CNC equipment, drill presses, and any application requiring reduced flex and improved hole accuracy at larger diameters.

Key Features:

• Drill Size: 15/16 in fractional / 0.9375 in decimal
• Series: R40 General Purpose Screw Machine (Stub) Length
• Material: High-Speed Steel (HSS) for durability across a wide range of materials
• Finish: Bright (uncoated) for general-purpose applications
• Point Angle: 118° conventional point for accurate starting and consistent hole geometry
• Flutes: 2 spiral flutes for efficient chip evacuation
• Shank: Straight shank for use in standard drill chucks
• Cutting Direction: Right-hand cut

Compatible Materials:

• Plain carbon steel and alloy steel
• Structural steel and case-carburizing steel
• Free-machining stainless steel (ferritic and austenitic)
• Graphite and malleable cast iron
• Brass, bronze, and copper
• Titanium and nickel alloys

The R40 screw machine drill's shorter body length provides superior rigidity compared to jobber-length alternatives, reducing deflection and improving precision in production drilling environments. The bright HSS construction offers reliable performance across a broad spectrum of metalworking and fabrication tasks.