Value Collection MSC-04913216 Hand Tap 7/16-20 Unf

Product Description

The VALUE COLLECTION MSC-04913216 is a 7/16-20 UNF straight-flute hand tap designed for bottoming operations in left-hand threaded applications. Ground from high speed steel with a bright uncoated finish, it cuts clean threads to the bottom of a blind hole where standard taper or plug taps cannot reach. The 4-flute geometry provides chip control and thread accuracy in a wide range of ferrous and non-ferrous materials. Overall length is 3-5/32 inches with a thread length of 1-7/16 inches. This tap is installed by hand with a tap wrench and is suited for tool rooms, maintenance shops, and production environments where left-hand thread repairs or new thread cutting are required.

This hand tap is used when a bottoming chamfer is required in blind holes on left-hand threaded fastener applications. The H3 thread limit provides a controlled fit tolerance that is appropriate for standard UNF class 3B internal threads. Typical applications include machinery repair, custom fabrication, and replacement thread work on left-hand threaded shafts, spindles, or fixtures where precision fit is critical. The bright finish suits general-purpose cutting without specialized coolant delivery, as coolant-through is not incorporated in this design.

Key Features

• Bottoming chamfer allows threading to the base of blind holes
• Left-hand thread direction for reverse-threaded applications
• H3 thread limit for controlled UNF class 3B fit tolerance
• 4-flute straight flute design for chip management and thread accuracy
• High speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish suitable for general-purpose cutting with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or direct-use hand tap for 7/16-20 UNF left-hand bottoming thread applications in standard tap wrench tooling.

Installation Notes

This tap is used by licensed machinists and maintenance technicians with a standard tap wrench sized for the square drive. Secure the workpiece before tapping and apply appropriate cutting fluid to reduce friction and extend tool life. Advance the tap gradually and back off periodically to break chips and prevent tap breakage. Do not force the tap against the bottom of a blind hole without confirming adequate thread depth allowance.