Value Collection JY4871091 Hand Tap 1-5/16-12 Uns

Product Description

The VALUE COLLECTION JY4871091 is a bottoming hand tap designed for cutting internal threads in pre-drilled holes where threads must extend to or near the bottom of a blind bore. Manufactured from high speed steel with a bright uncoated finish, this tap handles the demands of general-purpose threading in a shop or field environment. It covers a 1-5/16-12 thread form to the UNS standard and features a right-hand thread direction. With 4 straight flutes and an H4 thread limit, it suits applications requiring consistent thread tolerance in steel, cast iron, aluminum, and similar materials.

This tap is used in machining, maintenance, and fabrication settings where large-diameter UNS threads are required. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading to the bottom of blind holes. It measures 5.75 inches overall length with a 1.5-inch thread length, making it appropriate for moderate-depth threading passes. Machinists, tool-and-die workers, and maintenance technicians in industrial and manufacturing environments are the primary users of this tap.

Key Features

• Bottoming chamfer for threading to the base of blind holes
• 1-5/16-12 UNS thread form, right-hand direction
• H4 thread limit for controlled tolerance fit
• 4 straight flutes for chip clearance in through and blind hole applications
• High speed steel construction provides hardness and wear resistance
• Bright uncoated finish — no coating buildup to affect thread dimensions

Compatibility

Designed as an OEM-style replacement or standard tooling option for any application requiring a 1-5/16-12 UNS bottoming hand tap with an H4 thread limit in a 4-flute straight flute configuration.

Installation Notes

This tap is intended for use by machinists and maintenance technicians using a tap wrench or appropriate machine holder. Ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for a 1-5/16-12 thread before beginning. Apply a suitable cutting fluid for the workpiece material to extend tool life and improve thread quality. Back the tap off periodically to break chips and avoid binding, particularly in blind holes.