Value Collection MSC-04470225 Straight Flute Tap 1/4-20 Unc

Product Description

The VALUE COLLECTION MSC-04470225 is a straight flute tap designed to cut 1/4-20 UNC internal threads in a wide range of workpiece materials. It features four flutes ground from high-speed steel with a bright, uncoated finish and a taper chamfer that eases thread entry and reduces starting torque. The H3 thread limit holds tolerances appropriate for a 3B class of fit, making it a standard choice for general-purpose threading in production and maintenance environments. Overall length is 2.5 inches with a 1-inch thread length. Machinists, tool-and-die makers, and maintenance technicians use this tap for hand tapping and machine tapping operations.

This tap is suited for threading through-holes and blind holes in steel, aluminum, cast iron, and similar machinable materials where a 1/4-20 UNC thread form is required. The taper chamfer — typically 8 to 10 threads of lead — makes it the preferred starting tap when beginning a thread in a new hole. It fits standard tap wrenches and machine tap holders designed for the 1/4-20 shank size, and is appropriate for low-volume production runs, repair work, and field maintenance applications.

Key Features

• 1/4-20 UNC thread form with right-hand thread direction
• Taper chamfer for guided thread starting in new holes
• H3 thread limit for consistent 3B class-of-fit tolerances
• Four flutes for balanced cutting action and chip clearance
• High-speed steel construction for durability across common machinable materials
• Bright, uncoated finish — no additional coating buildup on thread flanks

Compatibility

Designed as a standard 1/4-20 UNC straight flute tap compatible with tap wrenches, T-handle tap wrenches, and machine tap holders sized for 1/4-20 tooling.

Installation Notes

Always drill the correct tap drill size before threading; an undersized hole increases torque and risk of tap breakage. Secure the workpiece firmly and align the tap perpendicular to the drilled hole before applying cutting pressure. Use appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. For hand tapping, advance the tap forward then back a quarter turn periodically to break chips and clear the flutes.