Osg 1005602908 Straight Flute Tap 3/4-16 Unf Bottoming Ticn

Product Description

The OSG 1005602908 is a straight flute bottoming tap designed for cutting 3/4-16 UNF right-hand internal threads in aluminum and cast iron. Built from powdered metal and finished with a TiCN coating, this tap delivers extended wear resistance in demanding machine-tapping applications. The bottoming chamfer style allows threading close to the bottom of a blind hole, making it the correct choice when full thread depth near the base is required. With 5 flutes and an H5 thread limit, it holds tight dimensional control suited to 2B class of fit requirements. Licensed machinists and tool-and-die professionals are the primary installers of this tooling.

This tap is intended for use in machine tapping operations on aluminum and cast iron workpieces where a 3/4-16 UNF thread form is specified. The bottoming chamfer makes it appropriate for blind-hole applications where thread engagement must run as deep as possible. The 2B class of fit is standard for most fastener and mechanical assembly applications. It belongs to OSG Series 10056, a line targeted at production and replacement tooling needs.

Key Features

• Bottoming chamfer for threading to the base of blind holes
• TiCN coating increases surface hardness and reduces galling on aluminum and cast iron
• Powdered metal construction provides a uniform grain structure and improved toughness over standard HSS
• 5-flute design distributes cutting load and improves chip management
• H5 thread limit and 2B class of fit for consistent, inspectable thread quality
• Right-hand thread direction compatible with standard machine tapping setups

Compatibility

Designed for machine tapping of 3/4-16 UNF threads in aluminum and cast iron. Suitable for use in CNC machining centers, drill presses, and manual tapping fixtures configured for straight-flute tap tooling of this shank diameter.

Installation Notes

This tap should be installed and operated by a qualified machinist following standard toolroom procedures. Secure the tap in a properly sized tap holder or rigid tapping chuck to prevent runout before engaging the workpiece. Ensure the machine spindle is stopped and the workpiece is firmly fixtured before tool changes. Always verify cutting fluid compatibility with the workpiece material and confirm tap alignment to avoid tap breakage in blind-hole applications.