Value Collection MSC-04489506 Straight Flute Tap 1-3/8-6 Unc

Product Description

The VALUE COLLECTION MSC-04489506 is a straight flute tap designed to cut internal threads in through-holes and open-ended blind holes. It is manufactured from high-speed steel with a bright, uncoated finish and produces 1-3/8-6 UNC right-hand threads to a 3B class of fit. The plug chamfer — typically 3 to 5 threads — makes this tap a general-purpose choice for starting in a pre-drilled hole or continuing a thread started by a taper tap. With a thread length of 3 inches and an overall length of 6-1/16 inches, this tap fits standard tap wrenches and machine setups used by machinists, maintenance technicians, and tool-and-die workers.

This tap is suited for production and maintenance machining applications where UNC coarse-pitch threads are required in ferrous and non-ferrous materials. The straight flute geometry works best in through-hole applications or shallow blind holes where chips can be cleared from the flutes without being packed into the bottom of the bore. It is a standard choice for repair threading, fixture fabrication, and general-purpose machine shop use in both manual and low-speed machine tapping operations.

Key Features

• 1-3/8-6 UNC thread form with 3B class of fit for standard tolerance internal threads
• 4 straight flutes provide rigidity and chip clearance in through-hole applications
• Plug chamfer — approximately 3 to 5 leading threads — for general-purpose hand and machine tapping
• High-speed steel construction for durability across a wide range of work materials
• Bright, uncoated finish suitable for use with cutting fluid in most standard threading operations
• H4 thread limit for consistent fit within the 3B tolerance range
• Right-hand thread direction, compatible with standard tap wrenches and tapping heads

Compatibility

Designed as an OEM-style replacement or standard tooling option for any application requiring 1-3/8-6 UNC internal threads. Compatible with standard tap wrenches, T-handle wrenches, and machine tapping heads that accept this shank size and overall length.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench or machine tapping setup. Always drill the correct tap drill size for 1-3/8-6 UNC threads before tapping, and use an appropriate cutting fluid for the work material to extend tap life and improve thread quality. Apply steady, even torque and back off periodically to break chips and prevent tap binding. Never force a tap against resistance — a seized tap in a workpiece is difficult to remove without damaging the part.