Osg 1100100 Straight Flute Tap 1/4-20 Unc Plug Hss

Product Description

The OSG 1100100 is a straight flute plug tap designed for cutting internal threads in a variety of ferrous and non-ferrous materials. Built from high-speed steel with a bright/uncoated finish, it produces 1/4-20 UNC right-hand threads with a standard H1 thread limit for consistent dimensional accuracy. The plug chamfer - typically 3 to 5 threads - makes it suitable for through-holes and most general-purpose tapping applications. With four flutes and a 2.5-inch overall length, this tap is a standard hand and machine tap used by machinists, pipefitters, and maintenance technicians across industrial and commercial settings.

This tap is used for tapping 1/4-20 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It fits standard tap handle drives and compatible machine spindles. The Series 101 designation places it within OSG's standard straight flute tap line, making it a reliable choice for production runs and maintenance repair work where a consistent thread profile is required.

Key Features

• 1/4-20 UNC thread form with right-hand thread direction
• Plug chamfer for general-purpose through-hole and open-bottom tapping
• 4-flute straight flute design for chip control in a wide range of materials
• H1 thread limit for close-tolerance thread production
• High-speed steel construction - no coolant-through required
• Bright/uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as an OEM-style straight flute plug tap for general-purpose 1/4-20 UNC tapping applications in aluminum, cast iron, and carbon steel workpieces using standard tap handles or machine tap holders.

Installation Notes

This tap is installed by licensed machinists or qualified maintenance technicians using a calibrated tap handle, tapping head, or CNC spindle with appropriate chuck. Always secure the workpiece and ensure the tap is started perpendicular to the hole to prevent thread damage or tap breakage. Apply a suitable cutting fluid for the workpiece material before and during tapping. Follow applicable shop safety standards and equipment manufacturer guidelines when operating tapping machines.