Osg 1069402 Straight Flute Bottoming Tap 10-32 Unf Hss

Product Description

The OSG 1069402 is a straight flute bottoming tap designed to cut internal threads in pre-drilled through or blind holes where full thread depth close to the bottom is required. Built from high-speed steel, this tap handles the demands of production tapping and repair threading across a wide range of ferrous and non-ferrous materials. It cuts a 10-32 UNF right-hand thread to a 3B class of fit with an H2 thread limit, delivering consistent tolerance across repeat operations. Thread length is 0.875 inches with an overall length of 2.375 inches. The 2-flute straight flute geometry suits most standard tapping applications in CNC machines, drill presses, and hand tap handles.

This tap is suited for threading operations in general manufacturing, maintenance and repair, and light production environments. The bottoming chamfer allows threading to within a few pitches of the bottom of a blind hole, making it the correct choice when thread engagement near the hole bottom is required. It is appropriate for use in manual tapping and machine tapping setups where coolant-through tooling is not needed.

Key Features

• Bottoming chamfer for full thread depth in blind holes
• 10-32 UNF thread form, right-hand direction
• 3B class of fit with H2 thread limit for consistent tolerance
• High-speed steel construction for durability across common workpiece materials
• 2-flute straight flute design compatible with standard tap holders and tapping heads
• No coolant-through requirement, simplifying setup

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces per manufacturer application data.

Installation Notes

This tap is installed by machinists and maintenance technicians using standard tap wrenches, T-handle tap holders, or machine tapping attachments. Always ensure the pilot hole is drilled to the correct tap drill diameter for a 10-32 UNF thread before tapping. Secure the workpiece fully before applying torque, and back the tap out periodically to clear chips when working in blind holes. Use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality.