Value Collection JY4848321 Straight Flute Tap 7/8-32 Uns

Product Description

The VALUE COLLECTION JY4848321 is a straight flute tap designed to cut 7/8-32 UNS internal threads in a range of materials. Built from high-speed steel with a bright/uncoated finish, it delivers reliable thread-cutting performance in both production and maintenance applications. The plug chamfer configuration — typically 3 to 5 chamfered threads — makes this tap well suited for threading through-holes where the tool can be started with moderate alignment pressure. With 4 flutes and an H3 thread limit, it holds tight tolerances for 3B class of fit applications. Overall length is 4-11/16 inches. Right-hand thread direction. Machinists and tool-and-die professionals are the primary users.

This tap is appropriate for use in machine shops, MRO environments, and manufacturing settings where UNS (Unified National Special) thread forms are specified. The 7/8-32 UNS designation indicates a 7/8-inch nominal diameter with 32 threads per inch — a fine-pitch UNS thread used in precision assemblies, instrumentation components, and specialty mechanical applications. The plug chamfer makes it a practical general-purpose choice for most tapping operations, including those performed on drill presses, CNC machining centers, or with a hand tap wrench in manual work.

Key Features

• 7/8-32 UNS thread form — fine-pitch Unified National Special designation for precision applications
• High-speed steel construction provides durability across a broad range of workpiece materials
• Bright/uncoated finish — suitable for general-purpose tapping without coating-related dimensional offset
• Plug chamfer for through-hole tapping with easy starting and consistent thread engagement
• H3 thread limit holds 3B class of fit tolerances for close-tolerance threaded assemblies
• 4-flute design balances chip evacuation and thread form support during cutting

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring a 7/8-32 UNS, 3B class of fit, right-hand thread. Coolant-through is not supported on this tap.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling professional. Power down and lock out any machine tool before securing the tap in the holder or chuck. Use the correct tapping speed and cutting fluid appropriate for the workpiece material to extend tool life and protect thread quality. Do not force the tap if resistance increases unexpectedly — back off to clear chips and re-evaluate cutting conditions.