Osg 1013000 Straight Flute Tap 5-40 Unc Taper Hss

Product Description

The OSG 1013000 is a straight flute tap designed to cut 5-40 UNC internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, it features 3 flutes and a taper chamfer that guides the tap into the workpiece gradually, reducing the torque required to start the cut. The H2 thread limit provides a controlled fit for 2B and 3B class-of-fit applications. Overall length is 1-15/16 inches with a thread length of 5/8 inches. Straight flute geometry makes this tap well suited for through-hole and short blind-hole applications where chip evacuation is manageable with standard technique.

This tap is intended for tapping applications in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is a standard production tap used in machine shops, maintenance environments, and field repair work wherever 5-40 UNC threads are required. The taper chamfer style makes it appropriate for through-holes or for starting threads in blind holes before following with a plug or bottoming tap.

Key Features

• 5-40 UNC thread form with right-hand thread direction
• Taper chamfer for guided entry and reduced starting torque
• 3 straight flutes sized for general-purpose chip handling
• H2 thread limit for 2B and 3B class-of-fit tolerance control
• High-speed steel construction for wear resistance across multiple materials
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or production tap for 5-40 UNC thread cutting in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Always ensure the hole is drilled to the correct tap drill size for 5-40 UNC before tapping. Apply appropriate cutting fluid for the workpiece material to reduce friction and extend tool life. For blind-hole applications, take care not to bottom the tap against the hole floor, which can cause tap breakage.