Value Collection JY4840419 Straight Flute Tap 1/4-40 Uns

Product Description

The VALUE COLLECTION JY4840419 is a straight flute bottoming tap designed for cutting internal threads in blind holes where full thread depth close to the bottom of the bore is required. Manufactured from high-speed steel with a bright, uncoated finish, this tap handles 1/4-40 UNS right-hand threads and carries a 4-flute configuration that provides balanced chip evacuation and cutting stability. The H2 thread limit designation indicates a tight tolerance ground thread, appropriate for precision threading applications. Overall length is 2.5 inches. Machinists, toolroom technicians, and maintenance professionals use this tap in both manual and machine tapping operations.

This tap is suited for threading blind holes in ferrous and non-ferrous metals, plastics, and similar materials where a bottoming chamfer is needed to produce usable threads as close to the bottom of the hole as possible. The 1/4-40 UNS thread form is common in instrument, optical, and precision mechanical applications. It is appropriate for use on manual taps, tapping arms, or CNC rigid tapping setups where right-hand thread direction is required. The bright finish makes it a general-purpose option for lower-speed tapping and job shop environments.

Key Features

• Bottoming chamfer allows threading to within 1-2 thread pitches of the bottom of a blind hole
• 4-flute design provides cutting stability and balanced load distribution
• High-speed steel construction offers good toughness for hand and machine tapping
• H2 thread limit ensures tight, consistent thread tolerance for precision fits
• Bright/uncoated finish suitable for general-purpose threading across a wide range of materials
• Right-hand thread direction, standard for the majority of threading applications

Compatibility

Designed as a standard replacement or stock tap for any application requiring a 1/4-40 UNS internal thread in a bottoming configuration. Compatible with standard tap holders, T-handle wrenches, and tapping chucks that accept the appropriate shank diameter for this tap size.

Installation Notes

Tapping operations should be performed by qualified machinists or maintenance technicians familiar with thread cutting procedures. Ensure the workpiece is securely clamped and the tap is started square to the hole to avoid thread misalignment or tap breakage. Use an appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Back the tap out periodically when hand tapping to break chips and clear the flutes.