Value Collection MSC-04472189 Straight Flute Tap 3/8-16 Unc

Product Description

The VALUE COLLECTION MSC-04472189 is a straight flute tap designed to cut internal threads in ferrous metals, cast iron, and similar materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it produces 3/8-16 UNC threads to a 3B class of fit using a taper chamfer entry. The taper chamfer distributes cutting load gradually across the leading threads, making this tap well suited for through-hole applications where alignment is straightforward. With a thread limit of H3 and four flutes, it delivers consistent thread geometry across production and maintenance work. The overall length is 2-15/16 inches with a 1-1/4 inch thread length, and the tool weighs 0.09 pounds.

This tap is used in general machining, fabrication shops, and maintenance environments where 3/8-16 UNC threads are required. Typical applications include threading through-holes in structural steel, machine frames, brackets, and equipment housings. The right-hand thread direction is standard for the vast majority of fastener applications. It is sized for use in a standard tap handle or machine tapping setup and is appropriate for both manual and low-speed machine tapping operations.

Key Features

• 3/8-16 UNC thread size with 3B class of fit for standard tolerance internal threads
• Taper chamfer distributes cutting force gradually, ideal for through-hole tapping
• High-speed steel construction provides durability across a range of ferrous workpiece materials
• H3 thread limit ensures consistent fit with standard 3/8-16 UNC fasteners
• Four-flute design offers chip clearance and stable cutting geometry
• Right-hand thread direction, bright uncoated finish, no coolant-through requirement

Compatibility

Designed as an OEM-style replacement or standard service tap for any application requiring 3/8-16 UNC internal threads; fits standard tap handles and collet-style machine tap holders sized for 3/8 inch shank taps.

Installation Notes

Machinists and maintenance technicians should secure the workpiece firmly before tapping to prevent movement during thread cutting. Apply cutting fluid appropriate for the workpiece material to reduce heat and extend tool life. Use a calibrated tap handle or tapping head to maintain axial alignment and avoid tap breakage. Back off periodically to clear chips, especially in deeper holes, and never force the tap against hard resistance.