Value Collection MSC-04476198 5/8-18 Unf Bottoming Tap Hss

Product Description

The VALUE COLLECTION MSC-04476198 is a straight flute bottoming tap designed for cutting 5/8-18 UNF internal threads in through or blind holes where full thread depth close to the bottom of the hole is required. Built from high-speed steel (HSS) with a bright uncoated finish, this tap delivers reliable performance in a wide range of common shop materials. With 4 flutes and an H3 thread limit, it maintains dimensional accuracy within 3B class of fit tolerances. The overall length is 3-13/16 inches with a 1-13/16 inch thread length, making it a practical choice for machinists, maintenance technicians, and tool-and-die workers handling standard unified fine thread applications.

This tap is suited for use in manual hand tapping operations or low-speed machine tapping setups where a bottoming chamfer is needed to chase threads to the base of a blind hole. The right-hand thread direction and 5/8-18 UNF specification make it appropriate for general fabrication, repair work, and production environments where unified fine thread fastener systems are standard. It is a single-piece unit with no coolant-through capability, intended for conventional cutting fluid application.

Key Features

• Bottoming chamfer allows threading to within 1-2 threads of a blind hole bottom
• 5/8-18 UNF right-hand thread form for unified fine thread applications
• 4-flute straight flute geometry for chip control in through and blind holes
• High-speed steel construction provides durability across common workpiece materials
• H3 thread limit maintains 3B class of fit tolerance for standard fastener compatibility
• Bright uncoated finish suitable for use with cutting oil or tapping fluid

Compatibility

Designed as a standard bottoming tap for 5/8-18 UNF threaded holes in applications requiring 3B class of fit compliance.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench or tapping fixture. Always apply appropriate cutting fluid before and during the tapping operation to reduce heat and extend tool life. Ensure the workpiece is securely clamped and the tap is aligned perpendicular to the hole before beginning the cut. For blind holes, use a plug or taper tap to establish the thread before following with this bottoming tap to complete thread depth.