Value Collection JY66556168 Straight Flute Tap 1/2-27 Uns

Product Description

The VALUE COLLECTION JY66556168 is a straight flute tap designed for threading 1/2-27 UNS internal threads in a wide range of metalworking and fabrication applications. Built from high-speed steel (HSS) with a bright/uncoated finish, this tap features a bottoming chamfer that allows threading close to the bottom of a blind hole. It carries a 3B class of fit and an H3 thread limit, making it appropriate for standard-tolerance internal thread production. The 4-flute design provides balanced cutting action and adequate chip clearance for most ferrous and non-ferrous materials. Overall length is 3-3/8 inches with a thread length of 1-21/32 inches.

This tap is suited for machine shops, maintenance facilities, and field service environments where 1/2-27 UNS threads are required. The UNS (Unified National Special) thread form is used in applications where standard UN thread pitches do not meet design requirements, making this tap a specialty tool for specific mechanical assemblies and repair work. Right-hand thread direction is standard for the majority of fastening applications. The bottoming chamfer is particularly useful when full thread engagement close to the hole bottom is necessary.

Key Features

• Bottoming chamfer for threading to near the bottom of blind holes
• 4 flutes for balanced cutting and chip evacuation
• High-speed steel (HSS) construction for durability in general machining
• Bright/uncoated finish suitable for use with cutting fluids
• 3B class of fit with H3 thread limit for standard internal thread tolerances
• Right-hand thread direction

Compatibility

Designed for cutting 1/2-27 UNS right-hand internal threads; intended for use in standard tap holders and machine tapping setups compatible with this shank size and thread form.

Installation Notes

This tap is installed and operated by a qualified machinist or toolroom technician using appropriate tap holders, drill presses, mills, or CNC equipment. Ensure the pilot hole is drilled to the correct tap drill size for a 1/2-27 UNS thread before tapping. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Never force a tap; back off periodically to break chips and prevent tap breakage.