Precision Twist Drill 5997921 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997921 is a taper length high speed steel drill bit designed for demanding metal drilling applications across a wide range of materials. Built to DIN 340 standards, it features a 135-degree split point for self-centering entry without a center punch, reducing walking on hard or smooth surfaces. The parabolic flute geometry promotes efficient chip evacuation at deeper penetration depths, keeping heat and friction low. At 0.2362 inches (6 mm) in diameter with a straight shank, this bit seats securely in standard drill chucks and CNC tool holders. Installation is handled by machinists, tool-and-die technicians, HVAC fabricators, and general metalworking trades.

This drill bit is sized at 6 mm (0.2362 inches) diameter and belongs to the QC91PM series, which is optimized for heavy-duty, high-performance drilling. With a flute length of 3-37/64 inches (91 mm) and an overall length of 5-15/32 inches (139 mm), it is suited for taper-length drilling where standard jobber bits lack the reach. The 6xD flute-to-diameter ratio supports deeper holes in a single pass. Applicable materials include alloy steel, carbon steel, stainless steel, cast iron, aluminum, brass, bronze, copper, titanium, nickel, magnesium, graphite, tempered steel, and hardened steel.

Key Features

• 135-degree split point for self-centering, no center punch required
• Parabolic flute design with web thinning for fast chip evacuation and reduced thrust
• High speed steel (HSS) construction rated for heavy-duty, high-performance use
• Taper length body (6xD ratio) provides extended reach over standard jobber bits
• Bright/uncoated finish — compatible with cutting oils and coolants for extended bit life
• Conforms to DIN 340 specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-style taper length drill bit for use in standard straight-shank drill chucks and CNC machining centers requiring a 6 mm (0.2362 inch) diameter bit conforming to DIN 340. Compatible material applications include alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, magnesium alloy, malleable iron, nickel, stainless steel, steel, tempered steel, titanium, and titanium alloy.

Installation Notes

This bit is installed by machinists and metalworking technicians using standard drill presses, lathes, or CNC machining centers. Secure the straight shank fully in the chuck before operation and verify runout before drilling into finished workpieces. No coolant-through capability is present on this model, so apply cutting fluid externally when drilling hardened or stainless steel to manage heat. Always follow shop safety protocols and equipment manufacturer guidelines when operating rotating tooling.