Value Collection JY4840401 Straight Flute Tap 1/4-40

Product Description

The VALUE COLLECTION JY4840401 is a straight flute tap designed to cut 1/4-40 UNS internal threads in a wide range of materials. Built from high-speed steel with a bright, uncoated finish, this tap delivers reliable thread-forming performance in production and maintenance machining environments. The plug chamfer — typically 3 to 5 threads — makes it suited for through-hole tapping where the tool can advance past the threaded section. Overall length is 2.5 inches, and the H2 thread limit provides a controlled fit tolerance for standard fastener applications. Machinists and maintenance technicians are the primary users of this tool.

This tap is used in general machining, tool-and-die, and industrial maintenance applications where 1/4-40 UNS thread form is required. The UNS (Unified National Special) thread standard is commonly specified in precision instrument components, specialty fasteners, and legacy mechanical assemblies. The straight flute design performs well in through-hole applications and in materials that produce short, breakable chips such as cast iron, brass, and free-machining steels.

Key Features

• 1/4-40 UNS thread form, right-hand thread direction
• 4 straight flutes for stable cutting action in through-hole applications
• Plug chamfer for general-purpose through-hole tapping
• High-speed steel construction for durability across a range of workpiece materials
• H2 thread limit for controlled fit tolerance
• Bright, uncoated finish — suitable for use with cutting fluids

Compatibility

Designed as an OEM-style replacement or general-use tap for applications requiring a 1/4-40 UNS straight flute plug tap in standard tap holder and machine spindle setups.

Installation Notes

This tap is installed and operated by qualified machinists using standard tap holders, tapping heads, or CNC rigid-tapping spindles. Always select the correct drill size for the 1/4-40 UNS thread prior to tapping, and apply an appropriate cutting fluid to extend tool life and improve thread quality. Secure the workpiece fully before engaging the tap, and back off periodically when hand-tapping to break chips. Do not force a tap that has stalled — reverse and clear chips before continuing to avoid breakage.