Osg 2988301 Spiral Flute Tap M6x1.00 Bottoming 6H Hss

Product Description

The OSG 2988301 is a spiral flute bottoming tap designed for cutting M6x1.00 metric coarse internal threads in blind holes. It features a right-hand spiral flute geometry with a 50-degree helix angle that evacuates chips upward out of the hole, making it well suited for through and blind-hole applications where chip packing is a concern. Manufactured from high-speed steel with a steam oxide coating, it carries a 6H class of fit and is built to produce consistent, accurate threads in production and repair environments. The overall length is 2.5 inches with a shank diameter of 0.255 inches.

This tap is intended for use on aluminum and carbon steel workpieces in machining, fabrication, and maintenance settings. The bottoming chamfer allows threading close to the bottom of a blind hole, which is critical when full thread engagement depth is required near a shoulder or a stopped bore. It is sized and configured for use in CNC machining centers, drill presses, and manual tapping operations alike.

Key Features

• M6x1.00 metric coarse thread form with right-hand thread direction
• Bottoming chamfer for threading to the bottom of blind holes
• 50-degree helix angle promotes upward chip evacuation
• High-speed steel construction for durability across aluminum and carbon steel
• Steam oxide coating reduces friction and improves lubrication retention
• 6H class of fit for standard metric thread tolerance applications

Compatibility

Designed as an OEM-style replacement or direct-use spiral flute tap for M6x1.00 metric coarse bottoming applications in aluminum and carbon steel. Suitable for use with standard tap holders and quick-change tapping heads accepting a 0.255-inch shank diameter.

Installation Notes

Installation should be performed by a machinist or qualified technician following applicable shop safety procedures. Ensure the workpiece is properly fixtured and the tap is aligned perpendicular to the drilled hole before engagement. Use a cutting fluid or tapping compound appropriate for the workpiece material to extend tool life and improve thread quality. Do not exceed the recommended speed range for the tap material and workpiece combination.