Value Collection JY4878211 Hand Tap 1-7/8-20 Uns Bottoming Hss

Product Description

The VALUE COLLECTION JY4878211 is a straight-flute hand tap designed for cutting 1-7/8-20 UNS internal threads in a wide range of materials. Built from high speed steel (HSS) with a bright, uncoated finish, this tap delivers consistent thread geometry and durability across production and maintenance applications. The bottoming chamfer configuration allows threading to run close to the bottom of blind holes, making it the correct choice when full thread depth is required near the base of a bore. Overall length is 5 inches. Machinists, tool and die makers, and maintenance technicians are the primary users.

This tap is suited for threading operations in machine shops, maintenance facilities, and manufacturing environments where UNS thread forms are specified. The 1-7/8-20 thread size places it in heavy industrial and precision mechanical applications. The 3B class of fit indicates a standard tolerance for general-purpose threaded assemblies. With six flutes and a straight-flute design, it is intended for use in through-hole and shallow blind-hole applications where chip evacuation can be managed manually or with appropriate cutting fluid.

Key Features

• Bottoming chamfer for threading to the base of blind holes
• High speed steel construction for wear resistance across a range of workpiece materials
• Bright (uncoated) finish — compatible with standard cutting oils and fluids
• Six-flute straight-flute design for controlled chip formation
• H6 thread limit for consistent tolerance control in 3B-class assemblies
• Right-hand thread direction — standard for most UNS threaded applications

Compatibility

Designed as an OEM-style hand tap for cutting 1-7/8-20 UNS right-hand internal threads in metalworking and machining operations where a bottoming chamfer and 3B class of fit are required.

Installation Notes

This tap is installed by machinists or qualified maintenance personnel using a standard tap wrench or suitable holding fixture. The workpiece should be securely fixtured and the pilot hole drilled to the correct tap drill diameter for a 1-7/8-20 thread before use. Apply appropriate cutting fluid throughout the tapping operation to extend tool life and improve thread finish. For blind holes, clear chips frequently to prevent tap breakage and ensure full thread depth is achieved safely.