Value Collection JY4838298 Hand Tap 10-28 Uns Bottoming Hss

Product Description

The VALUE COLLECTION JY4838298 is a 10-28 UNS bottoming hand tap designed to cut full threads to the bottom of a blind hole. Manufactured from high speed steel (HSS) with a bright, uncoated finish, it features a 4-flute straight flute geometry and a right-hand thread direction. The H3 thread limit ensures consistent Class 3B tolerance fits for close-tolerance fastener applications. With an overall length of 2.375 inches, this tap is suited for hand-tapping operations in machine shops, maintenance environments, and production work where controlled thread depth at the bottom of a hole is required.

This tap is intended for use in threading operations on ferrous and non-ferrous materials where a UNS 10-28 thread form is specified. The bottoming chamfer style — typically 1 to 2 threads of lead — allows the tap to thread as close to the bottom of a blind hole as possible, making it appropriate for applications where thread engagement depth is limited. It is commonly used by machinists, toolmakers, and maintenance technicians working with small fastener assemblies in light-duty mechanical and structural components.

Key Features

• Bottoming chamfer cuts full threads to the bottom of blind holes
• High speed steel construction provides hardness and wear resistance for hand-tapping
• 4-flute straight flute design for chip control in through and blind hole applications
• Bright uncoated finish suitable for use with cutting fluids across a range of materials
• H3 thread limit maintains Class 3B tolerance for close-tolerance thread fits
• Right-hand thread direction matches standard fastener orientation

Compatibility

Designed for use with standard tap wrenches and T-handle drivers sized for small-shank hand taps. Cuts 10-28 UNS thread form per applicable UNS thread standards.

Installation Notes

This tap is intended for hand-tapping operations performed by machinists or maintenance technicians. Before tapping, ensure the correct drill size for a 10-28 thread has been used and the workpiece is securely fixtured. Apply an appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. Use a bottoming tap only as the final step in a tapping sequence — complete threading with a taper or plug tap first when working in blind holes.