Hertel 84578277 Jobber Drill Bit Wire 72 0.025 in Hss

Product Description

The HERTEL 84578277 is a jobber-length twist drill bit sized to wire gauge No. 72, equivalent to 0.0250 inches in decimal diameter. Manufactured from high speed steel with a bright, uncoated finish, it features a standard 118-degree split point and a tapered web with web thinning for improved chip evacuation and reduced thrust on entry. The straight-cylindrical shank and regular spiral fluting make it compatible with standard drill chucks. With an overall length of 1.125 inches and a flute length of 0.3125 inches, this is a small-diameter precision bit suited for light-duty drilling in metals, plastics, and soft materials. Machinists, tool-and-die workers, and general metalworking trades are the primary users.

This bit is intended for general-purpose drilling applications where wire-gauge-sized holes are required. Typical uses include pilot hole drilling, precision hole layout in sheet metal, electronics enclosures, instrument panels, and similar light-gauge substrates. The two-flute spiral design handles both hand-held and machine-mounted drill operations. It ships individually but requires a minimum order quantity of 12 units, making it appropriate for shop stock replenishment or production floor use.

Key Features

• Wire gauge No. 72 size — 0.0250 inch decimal diameter for precision small-bore applications
• High speed steel construction rated for general-purpose drilling in metal and non-metal materials
• 118-degree standard point angle with web thinning for reduced entry thrust
• Tapered web configuration supports chip flow in shallow-flute geometry
• Bright uncoated finish — no coating buildup to affect tight-tolerance hole sizing
• Right-hand cut, two-flute spiral for use with standard clockwise-rotation spindles

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks, CNC drilling centers, drill presses, and hand drills accepting straight-cylindrical shanks at the 0.0250 inch diameter.

Installation Notes

Installation is performed by machinists or general metalworking trades using any chuck capable of gripping a 0.0250-inch straight shank. At this diameter, secure, centered chuck engagement is critical — use a precision keyless or keyed chuck rated for small-diameter tooling. Ensure spindle speed is set appropriately for the bit diameter and workpiece material before starting the cut. Do not apply excessive feed pressure, as small-diameter HSS bits are prone to deflection and breakage under lateral load.