Value Collection JY4876009 Hand Tap 1-5/8-5-1/2 Uns

Product Description

The VALUE COLLECTION JY4876009 is a bottoming hand tap designed for cutting internal threads in pre-drilled holes where full thread engagement close to the bottom of a blind hole is required. Manufactured from high speed steel with a bright, uncoated finish, this tap produces 1-5/8-5-1/2 UNS right-hand threads to a 3B class of fit and H4 thread limit. With 6 straight flutes and an overall length of 6-11/16 inches, it is suited for use in manual tapping operations by machinists and maintenance technicians working with larger diameter thread forms.

This tap is intended for hand tapping applications in metalworking, general machining, and maintenance-repair-overhaul environments. Its bottoming chamfer geometry allows threading to within a few threads of the bottom of a blind hole, making it a standard final-step tap in a three-tap sequence. The UNS thread standard accommodates specialty thread forms not covered by standard Unified National Coarse or Fine designations, common in industrial and legacy equipment applications.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• High speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose tapping with cutting fluid
• 6 straight flutes for efficient chip clearance in through and shallow blind holes
• 3B class of fit and H4 thread limit for standard tolerance internal threads
• Right-hand thread direction, 1-5/8-5-1/2 UNS thread form

Compatibility

Designed as an OEM-style replacement or direct-use hand tap for manual tapping operations requiring a 1-5/8-5-1/2 UNS bottoming tap with 3B fit and H4 thread limit.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench sized for the tap shank. Always ensure the pilot hole is drilled to the correct tap drill diameter for a 1-5/8-5-1/2 UNS thread before tapping. Apply appropriate cutting fluid throughout the operation to extend tap life and improve thread quality. Back the tap off periodically to break and clear chips, particularly in blind hole applications.