Value Collection JY4910204 1/4-20 Unc Straight Flute Tap

Product Description

The VALUE COLLECTION JY4910204 is a straight flute tap designed to cut 1/4-20 UNC internal threads in a left-hand direction. Built from high-speed steel with a bright, uncoated finish, it delivers reliable performance across a range of threading applications. The plug chamfer style provides a balanced lead-in suitable for through holes and moderately deep blind holes. With an H3 thread limit, this tap holds close tolerances appropriate for a 3B class of fit. Overall length is 2.5 inches, making it a compact, easy-to-handle tool for machine shop and maintenance work. Four flutes provide adequate chip clearance for the material types this tool is rated for.

This tap is suited for machinists, maintenance technicians, and tool-and-die professionals working with through-hole or standard blind-hole threading where left-hand thread orientation is required. Left-hand taps are commonly used for applications involving components that experience counterclockwise rotation, preventing self-loosening under operational loads. The 1/4-20 UNC thread form is one of the most common fastener sizes in North American mechanical assemblies, and this tap is appropriate for use in steel, cast iron, and similar ferrous materials within the capacity of high-speed steel tooling.

Key Features

• Left-hand thread direction for counterclockwise thread applications
• H3 thread limit for consistent 3B class of fit tolerances
• Plug chamfer lead-in suitable for through holes and moderate blind holes
• High-speed steel construction for durability across ferrous materials
• Bright, uncoated finish — no coating buildup affecting thread dimensions
• Four flutes for efficient chip evacuation during tapping operations

Compatibility

Designed as a standard replacement or shop-stock tap for 1/4-20 UNC left-hand thread applications where a plug chamfer style and 3B class of fit are specified.

Installation Notes

This tap is intended for use by machinists and maintenance professionals operating drill presses, CNC machines, or hand-tapping setups. Ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter before threading. Apply appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Never force a tap against excessive resistance — back off periodically to break chips and prevent tap breakage.