Value Collection MSC-04540225 Spiral Point Tap 1/4-20 Unc

Product Description

The VALUE COLLECTION MSC-04540225 is a spiral point tap designed to cut internal threads in through-hole applications. Built from high speed steel (HSS) with a bright uncoated finish, this tap uses a plug chamfer and a spiral point geometry that pushes chips forward ahead of the cutting action, keeping flute channels clear during the threading process. It cuts 1/4-20 UNC threads to a 3B class of fit with an H3 thread limit, making it well suited for applications requiring standard tolerance internal threads. It weighs 0.05 pounds and delivers a thread length of 1 inch.

This tap is intended for threading through-holes in steel, aluminum, brass, and similar machinable materials at the 1/4-20 UNC specification. The plug chamfer configuration is the most common general-purpose style, requiring the hole to pass fully through the workpiece so chips can exit from the far end. It is used in machine shops, production environments, and maintenance operations where standard UNC thread cutting is required. The right-hand thread direction matches standard fastener orientation.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• 1/4-20 UNC thread form with 3B class of fit for standard tolerance internal threads
• H3 thread limit provides controlled oversize tolerance suitable for most production threading
• High speed steel construction offers durability across a range of common workpiece materials
• Bright uncoated finish — no coolant-through requirement, suitable for use with cutting fluid applied externally
• 3-flute design balances chip evacuation with cutting stability in the 1/4-20 size range

Compatibility

Designed as a standard replacement or production spiral point tap for through-hole 1/4-20 UNC threading operations. Compatible with tap handles, tapping heads, and CNC machine tool holders sized for this shank diameter and thread specification.

Installation Notes

This tap is installed and operated by machinists and maintenance technicians using hand tap wrenches, tapping attachments, or CNC spindles with appropriate tap holders. Always ensure the pilot hole is drilled to the correct tap drill size for 1/4-20 UNC before tapping. Apply a suitable cutting fluid or tapping compound to extend tool life and improve thread finish. For through-hole use only — do not use a plug-chamfer tap to cut blind holes to full thread depth.