Value Collection MSC-04619425 3/8-16 Unc Spiral Flute Tap

Product Description

The VALUE COLLECTION MSC-04619425 is a spiral flute bottoming tap designed for cutting 3/8-16 UNC internal threads in blind holes. It features a 45-degree helix angle that pulls chips up and out of the hole during tapping, reducing clogging in deeper bores. Made from high-speed steel with a bright uncoated finish, this tap is suited for general-purpose threading in a range of ferrous and non-ferrous materials. The H3 thread limit and 3B class of fit make it appropriate for standard tolerance applications. Overall length is 2-15/16 inches, and the tool runs right-hand thread direction on both the flute and thread.

This tap is intended for use in machine shops, maintenance and repair operations, and production environments where 3/8-16 UNC bottoming threads are required in blind holes. The fast flute style and spiral geometry aid chip evacuation in materials such as mild steel, aluminum, and plastics. It is typically run in a tapping head, CNC machining center, or drill press with appropriate tapping fluid. Coolant-through is not supported on this tap.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• 45-degree helix angle promotes upward chip evacuation
• H3 thread limit holds 3B class of fit tolerances for standard fastener applications
• High-speed steel construction provides durability across a range of workpiece materials
• Bright uncoated finish suitable for use with cutting oils and tapping fluids
• Right-hand thread and right-hand flute direction for conventional tapping setups

Compatibility

Designed as a standard 3/8-16 UNC bottoming tap for use in any setup requiring a 3B class of fit internal thread with an H3 thread limit.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with tapping procedures and tooling selection. Always ensure the workpiece is securely fixtured and the spindle is properly aligned before engaging the tap. Use an appropriate cutting fluid or tapping oil for the workpiece material to reduce tool wear and improve thread finish. For blind hole applications, verify hole depth provides adequate clearance beyond the required thread depth before starting.