Precision Twist Drill 5995472 Jobber Drill Bit 19/64

Product Description

The PRECISION TWIST DRILL 5995472 is a jobber-length drill bit designed for general-purpose drilling in steel and cast iron. It is machined from high-speed steel (HSS) with a bright, uncoated finish and a standard 118-degree point angle. The left-hand cutting direction makes this bit particularly useful for removing broken fasteners and reverse-extraction applications. With a straight shank measuring 19/64 inch in diameter and an overall length of 4.375 inches, it fits standard drill chucks and is part of the Series L10 general-purpose line. Licensed tradespeople and machinists in HVAC, plumbing, and mechanical service work commonly reach for this bit when drilling into ferrous base materials.

This bit is suited for drilling operations in steel and cast iron workpieces across residential and commercial service applications. The left-hand spiral flute aids in chip evacuation during reverse-rotation drilling, which is the primary reason technicians select this configuration when extracting seized or broken bolts. The 10xD flute-to-diameter ratio and tapered web configuration with web thinning support cleaner entry and reduced thrust requirements in typical shop and field use.

Key Features

• Left-hand cut direction for broken fastener extraction and reverse-rotation drilling
• 118-degree standard point angle for use in steel and cast iron
• HSS construction with bright uncoated finish for general-purpose durability
• Web-thinned, tapered web design reduces drilling thrust and improves chip flow
• Regular spiral flute with 2-flute configuration for balanced chip evacuation
• Straight shank fits standard drill chucks without adapters

Compatibility

Designed for general-purpose drilling in steel and cast iron workpieces. Compatible with standard straight-shank drill chucks. Primary workpiece material codes P, M, K, N, and S are supported per the manufacturer specification.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and licensed tradespeople using standard keyed or keyless drill chucks. Secure the shank fully in the chuck before operation and verify the drill is set to reverse rotation when using the left-hand cut for fastener extraction. Keep cutting speeds appropriate for HSS tooling in ferrous materials to avoid overheating, which can soften the tool steel. No coolant-through capability is present on this bit, so external lubrication is recommended when drilling deeper holes in steel.