Value Collection JY4807145 Hand Pulley Tap 1-8 Unc

Product Description

The VALUE COLLECTION JY4807145 is a plug-chamfer hand pulley tap designed for cutting 1-8 UNC internal threads in through-holes and blind holes with adequate clearance. Manufactured from high-speed steel with a bright finish, this tap delivers reliable cutting performance across a range of workpiece materials including mild steel, aluminum, and plastics. The plug chamfer distributes cutting load across 3 to 5 leading threads, making it well suited for general-purpose tapping where a starter tap has already been used or the hole is pre-chamfered. At 10 inches overall length, the extended reach makes it practical for deep or restricted-access holes. Machinists, tool-and-die technicians, and maintenance mechanics are the primary users of this tool.

This tap is used in machine shops, maintenance facilities, and fabrication environments where 1-inch coarse-thread fasteners are assembled. The 1-8 UNC thread profile is a standard coarse-pitch designation common in structural, mechanical, and heavy-equipment assembly applications. The H3 thread limit produces a tolerance class appropriate for standard fit conditions with most commercial 1-8 UNC fasteners and hardware. The bright (uncoated) finish is suitable for use with conventional cutting fluids and tapping compounds during hand or slow-speed machine tapping operations.

Key Features

• 1-8 UNC thread form for standard coarse-pitch internal thread cutting
• Plug chamfer with 3-5 leading threads for versatile starting and through-hole tapping
• 4-flute geometry provides balanced cutting action and chip clearance
• High-speed steel construction for durability across a broad range of materials
• H3 thread limit for standard tolerance fit with commercial 1-8 UNC fasteners
• 10 inches overall length for extended reach in deep or obstructed applications

Compatibility

Designed as a standard-fit replacement or direct-use hand pulley tap for any application requiring 1-8 UNC internal threads cut to H3 tolerance.

Installation Notes

This tap is intended for use by machinists or qualified maintenance technicians familiar with thread-cutting operations. Always secure the workpiece before tapping and apply appropriate cutting fluid to extend tool life and improve thread quality. Back the tap off periodically during hand tapping to break chips and prevent binding. Inspect the tap for wear or chipping before each use, as a damaged tap can ruin a threaded hole or break off inside the workpiece.