Osg 1068502 Straight Flute Bottoming Tap 8-32 Unc

Product Description

The OSG 1068502 is a straight flute bottoming tap designed to cut internal threads in pre-drilled holes where full thread depth close to the bottom of a blind hole is required. Manufactured from high-speed steel, this tap produces 8-32 UNC right-hand threads with a 3B class of fit and an H2 thread limit, delivering the precision and consistency demanded in production and maintenance machining work. With 2 flutes and a bottoming chamfer, it clears chips efficiently in short, confined holes. Overall length is 2.125 inches with a thread length of 0.75 inches. This tool is typically run by machinists, tool-and-die technicians, and maintenance mechanics.

The 1068502 is well suited for tapping operations in both manual and CNC machine tool setups. The bottoming chamfer style makes it the right choice when thread engagement must extend to near the bottom of a blind hole, common in fixture plates, machine frames, and component assemblies. Rated for use across a broad range of workpiece materials, this tap handles aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is sold individually and is appropriate for job shop, production floor, and field maintenance use.

Key Features

• Bottoming chamfer allows threading close to the bottom of blind holes
• 8-32 UNC thread form with right-hand thread direction
• 3B class of fit and H2 thread limit for precise, interchangeable thread production
• High-speed steel construction provides wear resistance across a range of workpiece materials
• 2-flute straight flute design aids chip evacuation in short holes
• Compact overall length of 2.125 inches suits confined workpiece access

Compatibility

Designed as a standard 8-32 UNC bottoming tap compatible with drill presses, CNC machining centers, tapping heads, and manual tap handles configured for straight shank taps. Suitable for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance mechanics familiar with tapping operations and machine tool safety. Secure the workpiece fully before tapping and ensure the pilot hole diameter conforms to the recommended tap drill size for 8-32 UNC threads. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Never force a tap against resistance; back off periodically to break chips and prevent tap breakage.