Precision Twist Drill 5998671 1 Inch Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998671 is a 1-inch diameter screw machine length drill bit engineered for high-performance metal drilling applications. Built from high speed steel with a coated finish, this bit features a 118-degree standard point angle, web-thinned tapered web construction, and a regular spiral flute for efficient chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 6 inches overall length with a 4-inch flute, this screw machine format delivers rigidity and reduced deflection compared to jobber-length bits, making it a reliable choice for production drilling in tight setups.

The 5998671 is designed for drilling titanium and similar demanding workpiece materials where tool integrity and cutting geometry are critical. The Series R40 classification places this bit in a high-performance tier suitable for shops and field techs requiring consistent results in short-length, high-torque drilling scenarios. Typical applications include production machining, fabrication shops, and maintenance environments where stub-length bits are preferred for improved control and reduced chatter. The flute-to-diameter ratio of 2.5xD supports chip clearance without sacrificing rigidity.

Key Features

• 1-inch diameter with 118-degree standard point angle for general-purpose entry and centering
• Web-thinned tapered web reduces thrust and improves penetration in hard materials
• High speed steel construction with coated finish for extended tool life
• Screw machine length (6 inches overall, 4-inch flute) for improved rigidity and reduced deflection
• Right-hand spiral flute cut for standard drill chuck compatibility
• Meets ANSI standards; Series R40 high-performance designation

Compatibility

Designed for use with standard drill chucks accepting a straight-cylindrical shank. Rated for drilling titanium and comparable hard metals. Fits any setup requiring a 1-inch diameter screw machine length bit with a straight shank.

Installation Notes

This bit is installed by a machinist or qualified technician into a drill press, milling machine, or heavy-duty hand drill with a compatible chuck size. Ensure the machine is fully powered down and the chuck is released before seating or removing the bit. Use appropriate cutting fluid or coolant when drilling titanium or hard alloys to prevent heat buildup and premature edge wear. Secure the workpiece firmly before engaging the drill to avoid bit deflection or breakage.