Value Collection JY4877031 Hand Tap 1-3/4-8 Bottoming Hss

Product Description

The VALUE COLLECTION JY4877031 is a bottoming hand tap designed for cutting full threads to the bottom of blind holes in a wide range of materials. Ground from bright high speed steel (HSS), this tap features a 6-flute straight flute geometry that provides rigid support and clean thread formation. It is configured for right-hand (RH) thread cutting in the 1-3/4-8 UNS thread form and carries an H6 pitch diameter tolerance, making it suitable for applications requiring controlled fit. With an overall length (OAL) of 7 inches and a thread length of 3-9/16 inches, this tap handles production and maintenance threading tasks where depth matters.

This tap is used in machine shops, maintenance facilities, and industrial fabrication environments where UNS (Unified National Special) threads are required. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading as close to the bottom of a blind hole as possible. It is suited for manual tapping operations using a tap wrench or handle, making it a reliable choice for repair work, custom fabrication, and low-volume threading where a tapping machine is not practical.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High speed steel (HSS) construction for durability across a range of work materials
• Bright finish with no coating for straightforward inspection of condition and wear
• 6-flute straight flute design provides added rigidity and support during cutting
• H6 pitch diameter tolerance for controlled thread fit
• 1-3/4-8 UNS thread form for specialized thread applications

Compatibility

Designed as an OEM-style replacement or direct-use hand tap for manual tapping operations requiring a 1-3/4-8 UNS right-hand thread in standard tap wrench setups.

Installation Notes

This tap is installed by a machinist or maintenance technician using a properly sized tap wrench. The workpiece should be securely clamped before tapping begins. Apply cutting fluid appropriate for the workpiece material to reduce heat and extend tap life. Avoid excessive torque or side loading, which can cause tap breakage in blind-hole applications.