Milwaukee Tool 49-57-5120 Straight Flute Tap M4x0.75

Product Description

The MILWAUKEE TOOL 49-57-5120 is a straight flute tap designed to cut M4x0.75 metric internal threads in a variety of materials. Built from high-carbon steel with a black oxide finish, this tap offers adequate hardness and corrosion resistance for shop and field tapping operations. The plug chamfer style provides a moderate lead-in, making it well suited for through-hole and most blind-hole applications. Three flutes channel chips away from the cutting zone during operation. It carries a Class 2B thread fit, which is the standard tolerance class for general-purpose metric fastener assemblies. Licensed machinists, maintenance mechanics, and multi-trade contractors are the primary users.

This tap is intended for cutting M4x0.75 metric threads in ferrous and non-ferrous base materials encountered in light-duty machining, HVAC equipment fabrication, plumbing fixture assembly, and general mechanical maintenance. The straight flute geometry works best in softer materials and short-chipping metals where chip evacuation is not a limiting factor. The plug chamfer provides 3 to 5 lead threads, balancing ease of starting with usable thread depth in through-hole work. It ships individually and is sold as a single unit.

Key Features

• M4x0.75 metric thread size with right-hand thread direction
• Plug chamfer for balanced lead-in in through-hole and shallow blind-hole tapping
• 3-flute straight flute geometry for chip clearance in short-chipping materials
• High-carbon steel construction for hardness in general-purpose tapping
• Black oxide coating for mild corrosion resistance and reduced galling
• Class 2B thread fit tolerance for standard general-purpose metric fastener assemblies

Compatibility

Designed as an OEM-style straight flute tap for general-purpose metric M4x0.75 threading applications in standard tapping chucks and holders accepting the specified shank diameter.

Installation Notes

Tapping operations should be performed by qualified machinists or multi-trade mechanics familiar with cutting speeds, feeds, and proper tapping fluid selection for the base material. Secure the workpiece and align the tap perpendicular to the hole before applying cutting pressure to avoid tap breakage. Apply an appropriate cutting or tapping fluid to extend tap life and improve thread quality. Follow all applicable workplace safety procedures and relevant trade codes when performing machining or threading work.