Hertel 48538177 No. 20 Wire Size Threaded Shank Drill Bit

Product Description

The HERTEL 48538177 is a threaded shank drill bit designed for precision drilling in low-tensile strength materials. It carries a No. 20 wire gauge size with a decimal equivalent of 0.1610 inches and features a 135-degree split point for self-centering entry with reduced walking at startup. The shank threads to a 1/4-28 specification for secure chuck engagement. Constructed from high speed steel with an oxide coating, this bit delivers dependable performance in general-purpose applications. The web-thinned, tapered web configuration reduces thrust requirements and improves chip evacuation. Licensed HVAC technicians, plumbers, electricians, and general trade professionals will find this bit suited to repetitive close-tolerance drilling tasks.

This bit is built to NAS 965 specification, making it appropriate for aerospace-adjacent and industrial trade applications where dimensional accuracy and material consistency are required. With an overall length of 2.125 inches and a right-hand spiral flute length of 1.125 inches, it is sized for controlled drilling in confined spaces or tight assemblies. Typical use includes sheet metal work, bracket fabrication, and fastener hole preparation in low-tensile strength materials such as aluminum, mild steel, and similar substrates commonly encountered in mechanical trade installations.

Key Features

• No. 20 wire size, 0.1610 inches decimal equivalent for precise hole sizing
• 135-degree split point with web thinning for self-centering starts and reduced thrust
• 1/4-28 threaded hex shank for secure chuck seating and minimal runout
• High speed steel construction with oxide coating for wear resistance
• NAS 965 specification compliance for dimensional consistency
• Right-hand spiral flute, regular spiral type for efficient chip removal

Compatibility

Designed as a general-purpose replacement or stock bit for use with 1/4-28 threaded shank drill chucks and compatible quick-change systems accepting that thread specification.

Installation Notes

Installation and use of this bit should be performed by a qualified tradesperson familiar with proper drilling technique and machine safety. Ensure the drill or driver is fully powered down and the chuck is secure before inserting or removing the bit. Verify chuck thread compatibility before installation to prevent cross-threading or shank damage. Always wear appropriate eye protection and secure the workpiece before drilling.