Osg 1065202 Straight Flute Tap 2-56 Unc Bottoming Hss

Product Description

The OSG 1065202 is a straight flute bottoming tap designed for threading operations in a wide range of ferrous and non-ferrous materials. It cuts a 2-56 UNC right-hand thread with a 2B class of fit, making it suitable for close-tolerance tapping work. Manufactured from high-speed steel, this tap offers good wear resistance for general-purpose machine and hand tapping. With 2 flutes and an H2 thread limit, it is sized for producing threads in blind holes where full thread depth close to the bottom is required. Overall length is 1.75 inches with a thread length of 0.4375 inches.

This tap is suited for use in light machining, fabrication, and maintenance environments where 2-56 UNC threads are required. Its bottoming chamfer style makes it the correct choice when threading must extend as close as possible to the bottom of a blind hole. Typical applications include machine shops, toolrooms, and field repair operations working with small fastener threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 2-flute straight flute geometry suited for short-chip materials
• High-speed steel construction for wear resistance in general-purpose tapping
• H2 thread limit for controlled 2B class of fit tolerances
• Right-hand thread direction, 2-56 UNC standard
• No coolant-through design - compatible with standard cutting fluid application

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Designed as a standard replacement or stock tap for any application requiring a 2-56 UNC bottoming tap with a 2B class of fit.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping head, or CNC machine tool. Before tapping, ensure the correct tap drill size for a 2-56 UNC thread is used and the workpiece is securely fixtured. Apply cutting fluid or tapping compound appropriate for the workpiece material to extend tool life and improve thread quality. Do not force the tap if resistance increases - back off to clear chips and prevent breakage.