Value Collection JY4912242 3/8-24 Unf Straight Flute Tap

Product Description

The VALUE COLLECTION JY4912242 is a straight flute tap designed to cut 3/8-24 UNF internal left-hand threads in pre-drilled holes. Built from high-speed steel with a bright uncoated finish, this plug-chamfer tap features four flutes and an H3 thread limit, making it suitable for through-hole tapping applications where chip evacuation is managed manually. It carries a 3B class of fit, which is the standard tolerance class for general-purpose inch-series threaded assemblies. Machinists and tool-and-die professionals reach for this tap when a left-hand thread is required for reverse-torque or counter-rotation fastening situations.

This tap is used in machining and fabrication environments where 3/8-24 UNF left-hand internal threads are needed. The plug chamfer — typically 3 to 5 threads of lead-in — makes it appropriate for through holes or holes with adequate thread runout. It is a single-piece hand or machine tap suited for job shops, maintenance and repair operations, and production machining on materials where high-speed steel provides adequate tool life.

Key Features

• Left-hand thread direction for reverse-torque and counter-rotation fastening applications
• 3/8-24 UNF thread form with 3B class of fit for standard general-purpose tolerance
• H3 thread limit for controlled oversize fit on tapped threads
• Plug chamfer provides 3 to 5 threads of lead-in for through-hole or deep blind-hole use
• Four-flute straight flute geometry for use in hand tapping or rigid machine tapping setups
• High-speed steel construction with bright uncoated finish

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 3/8-24 UNF left-hand internal thread with a 3B class of fit.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid tap cycle. Always ensure the pilot hole is drilled to the correct tap drill diameter for 3/8-24 UNF before threading. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Because this is a left-hand tap, rotation direction must be reversed from standard tapping procedure.