Value Collection JY4838801 Straight Flute Tap 12-56 Uns

Product Description

The VALUE COLLECTION JY4838801 is a straight flute tap designed to cut internal threads in through-holes and shallow blind holes where chip evacuation is straightforward. Built from high-speed steel with a bright, uncoated finish, this tap produces 12-56 UNS right-hand threads to a 3B class of fit. The plug chamfer — typically 3 to 5 threads of lead — makes it suitable for starting in a hole and progressing through most of the threading operation. At 2.375 inches overall length with 4 flutes, it is sized for use in standard tapping chucks, drill presses, and manual tap handles.

This tap is intended for threading operations in metalworking, maintenance, and fabrication environments. The 12-56 UNS designation places it in the Unified National Special thread series, a coarser-than-standard pitch used in applications where a 12-28 or 12-32 pitch is not suitable. Machinists, toolroom technicians, and industrial maintenance professionals typically reach for this tap when working with instrument hardware, specialty fasteners, or repair applications requiring the 12-56 thread form. It is appropriate for use in ferrous and non-ferrous metals within the capacity of the high-speed steel construction.

Key Features

• 12-56 UNS thread form with right-hand direction and 3B class of fit for standard tolerance threading
• Plug chamfer provides a gradual lead-in, suitable for through-hole and moderately deep blind-hole applications
• 4-flute straight design channels chips back along the flutes — best suited for through-holes or materials that produce short chips
• High-speed steel construction withstands the heat generated during threading in steel, aluminum, and similar materials
• Bright, uncoated finish allows easy visual inspection of tool condition and edge wear
• H2 thread limit designates a close-tolerance ground thread for consistent fit with mating 3B components

Compatibility

Designed as a standard-style replacement or stock tap for any application requiring a 12-56 UNS plug tap in high-speed steel with an H2 thread limit and 3B class of fit.

Installation Notes

Tapping operations should be performed by a qualified machinist or toolroom technician following established speeds and feeds for the workpiece material and tap size. Always use an appropriate tapping fluid or cutting oil to extend tool life and produce cleaner threads. Secure the workpiece firmly before starting and ensure the tap is aligned perpendicular to the hole to prevent tap breakage. Back out the tap periodically to clear chips and reduce the risk of jamming, particularly in deeper holes.