Value Collection JY4872206 Hand Tap 1-3/8-20 Uns

Product Description

The VALUE COLLECTION JY4872206 is a straight-flute hand tap designed for cutting 1-3/8-20 UNS internal threads in metalworking applications. Machined from high speed steel with a bright, uncoated finish, this tap features a plug chamfer entry — typically 3 to 5 threads of lead — that makes it suitable for through-hole and deeper blind-hole threading operations. With 6 flutes and a Class 3B fit tolerance, it produces tight, accurate threads appropriate for precision mechanical assemblies. The H4 thread limit indicates a controlled oversize grind that accommodates tap wear and plating allowances. Overall length is 4 inches. Licensed machinists and toolroom technicians are the primary users of this tool.

This tap is intended for hand-tapping or machine-tapping operations where a UNS (Unified National Special) 1-3/8-20 thread form is required. It is well suited for low-volume production, maintenance, repair, and overhaul work across industrial, aerospace, and general machining environments. The 6-flute geometry improves thread surface finish and distributes cutting load in applications where chip clearance is manageable. Right-hand thread direction matches the standard fastener convention for this thread size.

Key Features

• 1-3/8-20 UNS thread form with right-hand direction for standard fastener compatibility
• Plug chamfer provides gradual thread engagement, suitable for through-holes and deep blind holes
• 6-flute design improves surface finish and distributes cutting forces across the tap body
• H4 thread limit with Class 3B fit ensures controlled tolerance output for precision assemblies
• High speed steel construction offers good wear resistance across a range of workpiece materials
• Bright, uncoated finish — no coating buildup to affect thread tolerance or dimensional accuracy

Compatibility

Designed for use in any application requiring a 1-3/8-20 UNS right-hand internal thread with a Class 3B fit. Compatible with standard tap handles and machine tap holders sized for this shank diameter.

Installation Notes

This tap should be installed and operated by qualified machinists or maintenance technicians familiar with thread-cutting procedures. Always secure the workpiece and use appropriate cutting fluid for the base material being tapped. For hand tapping, use a properly sized tap wrench and advance the tap in partial-turn increments, backing off periodically to break chips. Inspect the tap for wear or chipping before each use — a damaged tap can result in broken tooling or out-of-tolerance threads.