Precision Twist Drill 5997966 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997966 is a taper length, high speed steel drill bit designed for demanding metal-removal applications across a broad range of materials. Built to Series QC91P standards, it features a 135-degree split point that reduces walking and improves self-centering on entry without a center punch. The parabolic flute geometry accelerates chip evacuation and allows faster feed rates compared to standard twist flutes. At 0.1910 inches in diameter (wire size 11) with a 3.625-inch flute length and 6-inch overall length, this bit suits through-hole drilling in medium to thick stock where a jobber-length bit would fall short. Machinists, maintenance mechanics, and fabricators are the primary users.

This drill bit is suited for general-purpose and heavy-duty drilling in a wide range of materials including alloy steel, carbon steel, hardened steel, tempered steel, stainless steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, copper, graphite, magnesium, magnesium alloy, nickel, titanium, and titanium alloy. The taper length body is particularly useful in production environments where deeper hole reach is needed without stepping up to a longer extension setup. The straight shank mounts directly in standard drill chucks or collet systems without adapters.

Key Features

• 135-degree split point for self-centering entry and reduced thrust force
• Parabolic flute profile promotes fast chip evacuation and cleaner holes at higher feed rates
• Web-thinned, tapered web configuration reduces cutting resistance in hard materials
• High speed steel construction provides toughness and heat resistance for general-purpose metal drilling
• Taper length body (6 inches OAL, 3.625-inch flute) reaches deeper than standard jobber bits of the same diameter
• Bright/uncoated finish allows easy visual inspection of wear and edge condition
• Meets ANSI standards; rated heavy-duty grade

Compatibility

Designed as a general-purpose taper length drill bit for use in standard drill chucks and collet holders accepting a 0.1910-inch straight shank. Compatible across CNC machining centers, drill presses, and hand-held drilling equipment configured for straight-shank tooling of this diameter.

Installation Notes

Installed by machinists and maintenance professionals in drill presses, milling machines, or hand drills with a compatible chuck. Ensure the shank is fully seated and the chuck is tightened securely before operation. Power down or de-energize the machine completely before changing or inspecting the bit. Do not exceed the recommended spindle speed for the material being drilled, and apply cutting fluid when drilling hardened steel, stainless steel, or titanium to extend tool life.