Value Collection MSC-04460291 Hand Tap 1/4-28 Unf Bottoming Hss

Product Description

The VALUE COLLECTION MSC-04460291 is a 1/4-28 UNF bottoming hand tap designed for cutting internal threads in pre-drilled holes where threads must extend as close to the bottom as possible. Ground from bright, uncoated high speed steel (HSS) with a 4-flute straight flute geometry, this tap is suited for hand tapping operations in a machine shop or field repair setting. It measures 2.5 inches in overall length with a 1-inch thread length, and the right-hand H2 thread limit ensures close tolerance fits appropriate for standard UNF fastener assemblies.

This tap is used in both production and maintenance applications where a 1/4-28 UNF internal thread is required in a blind hole. The bottoming chamfer — typically 1 to 2 lead threads — allows the tap to cut threads nearly to the bottom of a hole, making it the correct choice when thread engagement depth is critical. It is appropriate for use in steel, aluminum, and other machinable materials when used with proper cutting fluid. Machinists, maintenance technicians, and tool-and-die tradespeople are the primary users of this tap.

Key Features

• Bottoming chamfer allows threading to within 1-2 threads of a blind hole bottom
• H2 thread limit provides close tolerance for standard UNF fastener fits
• 4-flute straight flute design for balanced cutting in through and shallow blind holes
• Bright uncoated HSS construction — easy to inspect for wear and regrind
• Right-hand thread direction matches standard UNF fastener orientation
• Compact 2.5-inch overall length suits confined workpiece access

Compatibility

Designed as a standard replacement or general-use hand tap for any application requiring a 1/4-28 UNF right-hand internal thread in a blind or through hole.

Installation Notes

This tap is intended for hand tapping; use a proper tap wrench sized for the shank to maintain axial alignment and avoid breakage. Always apply an appropriate cutting fluid for the workpiece material before and during tapping. Ensure the pilot hole diameter matches the recommended tap drill size for 1/4-28 UNF before starting. Back the tap off periodically to break chips and prevent binding, especially in deeper blind holes.