Value Collection MSC-04489027 Straight Flute Tap 1-8 Unc

Product Description

The VALUE COLLECTION MSC-04489027 is a straight flute bottoming tap designed for cutting 1-8 UNC internal threads in through-holes and blind holes where full thread depth close to the bottom is required. Built from high-speed steel with a bright, uncoated finish, it delivers reliable cutting performance across a range of workpiece materials. The tap features 4 flutes, an H4 thread limit, and a 3B class of fit, making it well suited for precision threading applications where controlled tolerance is necessary. Overall length is 5.125 inches, with a thread length of 2.5 inches. Right-hand thread direction. Weighing 0.75 pounds, it is a solid, full-size tap appropriate for production and maintenance machining environments.

This tap is intended for use in machine shop and maintenance repair environments where 1-8 UNC bottoming threads are specified. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading as close to the bottom of a blind hole as the flute geometry permits. It is suitable for use in drill press, CNC, or tapping machine setups. Machinists and tool and die technicians working in manufacturing, industrial maintenance, and job shop settings are the primary users of this size and style of tap.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High-speed steel construction for durability across common workpiece materials
• 4-flute design provides chip clearance and cutting stability
• H4 thread limit and 3B class of fit for controlled threading tolerance
• Bright, uncoated finish — compatible with standard cutting fluids
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring 1-8 UNC internal threads with a bottoming chamfer and 3B class of fit.

Installation Notes

Installation is performed by qualified machinists using appropriate tapping equipment such as a drill press, lathe, or CNC machining center. Always ensure the tap is properly aligned with the pre-drilled hole before engagement to avoid tap breakage. Use a cutting fluid appropriate to the workpiece material to extend tap life and improve thread quality. Follow applicable shop safety procedures and manufacturer guidelines when selecting drill size for the specified thread fit.