Value Collection JY4878096 Hand Tap 1-7/8-12 Uns

Product Description

The VALUE COLLECTION JY4878096 is a bottoming hand tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. Ground from high speed steel with a bright, uncoated finish, this tap runs a 1-7/8-12 thread form to the UNS standard with a right-hand thread direction. It carries an H6 thread limit, making it suitable for applications that require tighter tolerance control. The 6-flute straight-flute geometry improves chip load distribution and surface finish on the thread form. Overall length is 5 inches with a thread length of 2 inches.

This tap is suited for production and maintenance shops cutting large-diameter UNS threads in steel, cast iron, and similar ferrous materials. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading to within a short distance of a blind-hole bottom, which is a common requirement in heavy equipment repair, tooling, and fixture work. It is used with a standard tap wrench or machine holder by machinists and maintenance technicians who need reliable thread formation on oversized fastener applications.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 6-flute straight-flute design distributes cutting load and improves thread finish
• H6 thread limit for tighter tolerance control on large-diameter threads
• High speed steel construction handles hardened ferrous materials
• Bright, uncoated finish suitable for use with cutting fluids
• Right-hand thread direction for standard UNS fastener applications

Compatibility

Designed for cutting 1-7/8-12 UNS right-hand internal threads; compatible with standard tap wrenches and machine tap holders sized for large-diameter taps.

Installation Notes

This tap is installed and driven by a licensed machinist or qualified maintenance technician using a tap wrench or appropriate machine holder. Always secure the workpiece and ensure the tap is aligned perpendicular to the hole before beginning the cut. Use a suitable cutting fluid to extend tool life and improve thread finish. Back off periodically to break chips and prevent tap binding or breakage in blind-hole applications.