Milwaukee Tool 49-57-5538 Tap Drill Set 1/4-28 Nf

Product Description

The MILWAUKEE TOOL 49-57-5538 is a 2-piece tap and drill set designed for cutting 1/4-28 NF (National Fine) internal threads in metal workpieces. The set includes one standard hand plug tap and one No. 3 drill bit, giving tradespeople everything needed to drill a pilot hole and tap a clean thread in a single kit. Both the tap and drill bit are manufactured from high carbon steel with an oxide finish on the tap for corrosion resistance and improved chip clearance during tapping operations. This set is suited for machinists, maintenance technicians, electricians, and general trade professionals who need a reliable thread-cutting solution for fine-thread fastener applications.

This set is intended for standard right-hand thread tapping in light- to medium-duty applications involving steel, aluminum, and similar materials. The 1/4-28 NF thread specification is common in precision assemblies, electrical enclosures, instrumentation panels, and mechanical equipment where fine threads are required for greater holding strength or finer adjustment. The No. 3 drill bit is correctly sized for the 1/4-28 NF tap, eliminating the need to cross-reference a separate tap drill chart before starting work.

Key Features

• Includes one 1/4-28 NF plug-style standard hand tap and one No. 3 drill bit
• High carbon steel construction on both tap and drill bit for durability in common metals
• Oxide tap finish for corrosion resistance and reduced friction during cutting
• Right-hand thread direction for standard fastener applications
• Matched drill and tap in one kit eliminates sizing guesswork on the job
• Compact 2-piece set with no case, suited for toolbox carry or pouch storage

Compatibility

Designed for use with standard hand tap wrenches sized for 1/4-28 NF plug taps. The included No. 3 drill bit is the correct pilot drill for the 1/4-28 NF thread specification.

Installation Notes

Thread tapping should be performed by a qualified machinist or trade professional familiar with hand tapping procedures. Always secure the workpiece before drilling and tapping, and apply appropriate cutting fluid to extend tap life and improve thread quality. Follow the drill bit manufacturer guidance for drill speed and feed rate based on material type. Inspect the tap for wear or damage before use — a broken tap in a blind hole requires specialized extraction tools to remove.