Value Collection JY4840377 1/4-36 Uns Bottoming Tap

Product Description

The VALUE COLLECTION JY4840377 is a straight flute bottoming tap designed for cutting internal threads in pre-drilled holes where thread engagement must extend close to the bottom of a blind hole. Built from high-speed steel with a bright, uncoated finish, this tap handles 1/4-36 UNS thread specifications across a range of ferrous and non-ferrous workpiece materials. With 4 flutes and an H2 thread limit, it produces accurate, consistent threads suited to production and maintenance threading tasks. Overall length is 2.5 inches, and the tap weighs approximately 0.17 pounds.

This tap is used in machine shops, maintenance facilities, and manufacturing environments where UNS fine-pitch threads are required. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading to within one or two pitches of the bottom of a blind hole, making it the final tap in a plug-and-bottoming sequence. It is installed in tap handles, tapping heads, or CNC toolholders and is suited for right-hand threaded applications. Licensed machinists, tool-and-die makers, and maintenance technicians commonly use this type of tap during repair and fabrication work.

Key Features

• 1/4-36 UNS thread form for fine-pitch unified national special applications
• Bottoming chamfer enables full threading depth in blind holes
• 4-flute straight flute design for controlled chip management in through and blind holes
• High-speed steel construction provides durability across a range of workpiece materials
• H2 thread limit for consistent tolerance control in standard threading operations
• Bright/uncoated finish — no additional coating variables to account for during tool selection

Compatibility

Designed as an OEM-style cutting tool replacement for 1/4-36 UNS bottoming tap applications in standard tap handles, tapping heads, and compatible toolholding systems.

Installation Notes

Secure the workpiece and ensure the tap is properly aligned with the pre-drilled pilot hole before applying torque to prevent tap breakage. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. In a bottoming sequence, always precede this tap with a taper or plug tap to establish the thread form before finishing with the bottoming tap. Replace worn taps promptly — continuing to use a dull tap increases the risk of breakage and out-of-tolerance threads.