Milwaukee Tool 49-57-5127 Straight Flute Tap 10-32 Unf

Product Description

The MILWAUKEE TOOL 49-57-5127 is a straight flute tap designed for cutting 10-32 UNF internal threads in through-holes and blind holes where chip ejection is managed manually or with coolant flush. Built from high-carbon steel with a black oxide finish, this tap resists corrosion and reduces friction during the threading operation. The plug chamfer — typically 3 to 5 threads of lead — makes it suitable for starting in a pre-drilled hole and is the most common general-purpose chamfer style used in production and maintenance work. It features 3 flutes and cuts right-hand threads to a Class 2B fit, which is the standard tolerance class for most threaded fastener applications in metalworking and light fabrication.

This tap is used in residential and commercial maintenance, electrical panel work, HVAC equipment assembly, and general metalworking where 10-32 UNF threads are required. The 10-32 thread size is common in instrument mounting, electrical enclosures, and small-gauge fastener applications. It is installed by hand with a tap wrench or by machine in a drill press or tapping fixture. The overall length of 2.25 inches accommodates standard tap wrench chucks without adapters.

Key Features

• 10-32 UNF thread form, Class 2B fit for standard fastener tolerance
• Straight flute geometry suited for through-holes and short blind holes in softer materials
• Plug chamfer with 3-flute configuration for general-purpose threading
• High-carbon steel construction for durability in light to medium-duty tapping
• Black oxide coating reduces surface friction and provides mild corrosion resistance
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed as a general-purpose straight flute tap for use in any standard tap wrench, T-handle, or machine tapping setup that accepts a tap with a 2.25-inch overall length and standard 10-32 shank sizing.

Installation Notes

A licensed machinist, electrician, or trained maintenance technician typically installs tapped threads using this tool. Always drill the correct tap drill size for 10-32 UNF before tapping, and ensure the workpiece is securely fixtured. Apply cutting oil or tapping fluid appropriate for the base material to extend tap life and improve thread quality. Reverse the tap periodically during hand tapping to break chips and prevent binding or breakage.