Value Collection JY4845301 Straight Flute Tap 9/16-28 Uns

Product Description

The VALUE COLLECTION JY4845301 is a straight flute bottoming tap designed for cutting 9/16-28 UNS internal threads in pre-drilled holes. Made from high-speed steel with a bright, uncoated finish, this tap is built for threading operations that require the thread to run close to the bottom of a blind hole. The bottoming chamfer provides minimal lead-in, allowing full thread engagement near the base of the bore. With 4 flutes and an H3 thread limit, it suits applications calling for a 3B class of fit. Overall length is 3-19/32 inches, and thread direction is right hand.

This tap is suited for machinists, tool-and-die makers, and maintenance technicians working on precision threading jobs in ferrous and non-ferrous materials. The UNS (Unified National Special) 9/16-28 thread form is used in specialized mechanical assemblies where standard thread pitches do not apply. The bottoming configuration makes it the correct choice when a plug or taper tap has already started the thread and full-depth threading to the bottom of a blind hole is required.

Key Features

• Bottoming chamfer allows threading to the base of blind holes after pre-threading with a plug or taper tap
• 4-flute straight flute design provides rigidity and clean chip management in through and blind hole applications
• High-speed steel construction offers durability across a range of workpiece materials
• H3 thread limit and 3B class of fit ensure consistent, standards-compliant thread tolerance
• Bright/uncoated finish suits general-purpose threading without added coating friction considerations
• Right hand thread direction for standard threading operations

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring a 9/16-28 UNS bottoming tap with a 3B class of fit and H3 thread limit in straight flute configuration.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a tap wrench, tapping fixture, or machine spindle appropriate for the workpiece setup. Always ensure the hole is pre-drilled to the correct tap drill diameter for a 9/16-28 UNS thread before beginning. Power down and secure the workpiece before tapping. Use cutting fluid appropriate for the workpiece material to reduce tool wear and improve thread finish.