Value Collection MSC-04470308 Straight Flute Tap 1/4-28 Unf

Product Description

The VALUE COLLECTION MSC-04470308 is a straight flute tap designed for cutting internal threads in through-holes and open-work applications. Built from high-speed steel with a bright, uncoated finish, this tap produces 1/4-28 UNF right-hand threads to a 3B class of fit, making it suitable for general-purpose threading in ferrous and non-ferrous materials. The taper chamfer distributes cutting load gradually across the leading threads, reducing startup force and improving thread accuracy. With an H3 thread limit, it holds tight tolerances appropriate for standard fastener applications. Machinists and maintenance technicians install this tap by hand or with a tapping head on a drill press or CNC machine.

This tap is suited for production and maintenance threading work in shops, fabrication facilities, and field repair settings. The 1/4-28 UNF thread form is widely used in precision mechanical assemblies, instrumentation, and fastener applications requiring fine thread engagement. The taper chamfer makes it appropriate for through-holes where a starting lead is needed. It is used across metalworking, mechanical assembly, and general machining environments where controlled internal thread cutting is required.

Key Features

• 1/4-28 UNF thread form for fine-pitch internal threading
• Taper chamfer distributes cutting force across multiple leading threads for easier starts
• High-speed steel construction provides hardness and wear resistance across a range of workpiece materials
• Bright, uncoated finish suitable for use with standard cutting fluids
• H3 thread limit for consistent 3B class-of-fit results
• 4 flutes with right-hand thread direction for standard tapping operations

Compatibility

Designed as a standard 1/4-28 UNF straight flute tap compatible with conventional tap wrenches, tapping heads, and machine spindles accepting standard shank tap tooling.

Installation Notes

Secure the workpiece firmly and ensure the tap is aligned perpendicular to the hole surface before starting. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Advance the tap in measured increments and back off periodically to break chips and prevent binding. Inspect the tap for wear or damage before each use, as a worn or chipped tap can produce out-of-tolerance threads or break in the hole.