Hertel 88558242 No. 27 Threaded Shank Drill Bit Hss

Product Description

The HERTEL 88558242 is a short-length threaded shank drill bit designed for precision drilling in low-tensile strength materials. It accepts a 1/4-28 hex shank thread and delivers consistent performance in applications where secure shank engagement is required. The bit measures 0.1440 inches in diameter (No. 27 wire size) with an overall length of 1.25 inches and a flute length of 0.5625 inches. The 135-degree split point reduces walking on entry and cuts right-hand with a regular spiral flute pattern. An oxide coating provides corrosion resistance during storage and light-duty service. This bit is typically installed by HVAC technicians, sheet metal workers, and maintenance professionals who require a threaded-shank format for use with tapping attachments or specialized drill holders.

This bit fits applications involving light-gauge metal, plastics, and other low-tensile strength materials where a short drill geometry is preferred. The web-thinned, tapered web construction reduces cutting resistance and improves chip evacuation in shallow-hole work. It conforms to NAS 965 Type B specification, making it suitable for production environments with standardized tooling requirements. The 1/4-28 threaded shank format is common in quick-change and tapping head systems used across HVAC fabrication, mechanical maintenance, and light manufacturing.

Key Features

• No. 27 wire size, 0.1440-inch diameter for precise hole sizing
• 135-degree split point reduces drill walking and entry force
• 1/4-28 hex threaded shank for secure engagement in tapping heads and quick-change holders
• Web-thinned tapered web construction improves chip flow and reduces cutting resistance
• Oxide-coated high speed steel construction for general-purpose durability
• Meets NAS 965 Type B specification for production and standardized tooling use

Compatibility

Designed as an OEM-style replacement for threaded shank drill bits meeting NAS 965 Type B specification; compatible with 1/4-28 threaded quick-change and tapping attachment systems.

Installation Notes

Installation and use should be performed by qualified technicians familiar with drill press, hand drill, or tapping head operation. Ensure the drill holder or tapping attachment is fully powered down and secured before inserting or removing the bit. Verify that the 1/4-28 threaded shank is fully engaged and torqued according to the tool manufacturer guidelines before operation. Use appropriate cutting fluid for the material being drilled to extend tool life and maintain hole quality.