Hertel C.401.0025 Jobber Drill Bit 0.25 Mm Hss

Product Description

The HERTEL C.401.0025 is a high speed steel jobber-length drill bit designed for precision drilling in metal, plastic, and general-purpose shop materials. Sized at 0.25 mm (0.0098 inches) in diameter with a standard 118-degree point angle, this bit is engineered for right-hand cutting with a spiral flute geometry that efficiently clears chips during through-hole and blind-hole operations. The bright, uncoated finish maintains consistent dimensional tolerances right out of the package. A straight-cylindrical shank ensures positive chuck engagement in standard keyless and keyed drill chucks used across machine shop and maintenance environments.

This bit is suited for precision drilling applications where extremely small-diameter holes are required. At 0.25 mm diameter and 19 mm overall length, it fits micro-drilling tasks in light manufacturing, electronics assembly, tooling, and maintenance repair operations. The two-flute spiral configuration supports clean entry and controlled chip evacuation, which is critical at this scale to prevent bit walk and breakage. Machinists and maintenance technicians working with precision fixtures, thin-gauge sheet metal, or circuit board substrates will find this bit appropriate for controlled, low-feed drilling setups.

Key Features

• 0.25 mm (0.0098 inches) diameter for micro-precision drilling
• 118-degree standard point angle for general-purpose material entry
• High speed steel construction provides durability across a broad material range
• Bright/uncoated finish maintains close dimensional accuracy
• Right-hand spiral flute design promotes efficient chip clearance
• Straight-cylindrical shank compatible with standard drill chucks

Compatibility

Designed as a general-purpose jobber drill bit suitable for use in standard drill chucks, drill presses, CNC drilling centers, and hand-held drilling equipment accepting straight-cylindrical shanks in the micro-diameter range.

Installation Notes

Installation of micro-diameter drill bits should be performed by a qualified machinist or maintenance technician. Ensure the drill chuck is clean and fully seated before tightening to prevent runout that can snap bits at this diameter. Use the lowest feed rate and appropriate spindle speed for the material being drilled. At 0.25 mm, bit breakage risk increases significantly with lateral force or misalignment, so a drill press or guided setup is strongly preferred over freehand operation.