Osg 1123102 Straight Flute Tap 9/16-12 Unc Plug Hss

Product Description

The OSG 1123102 is a straight flute plug tap designed for cutting internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel, it produces a 9/16-12 UNC right-hand thread with a plug chamfer, making it well suited for through-hole and blind-hole applications where a moderate lead-in is needed. The tap features 4 flutes and carries an H3 thread limit for close-tolerance work. Overall length is 3-19/32 inches with a thread length of 1-21/32 inches. It is intended for use by machinists, maintenance technicians, and fabricators working in job shops, manufacturing facilities, or field maintenance environments.

This tap is used in production and maintenance tapping applications across a broad range of material types. Its straight flute geometry is effective in shorter chipping materials such as cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, aluminum, and cast aluminum. It fits standard tap handles and tapping heads sized for the 9/16-12 shank. The plug chamfer style with a moderate lead-in is a common choice for general-purpose tapping where full thread depth is needed through or into a workpiece.

Key Features

• 9/16-12 UNC right-hand thread form for standard unified coarse-thread applications
• Plug chamfer provides a moderate lead-in suitable for through-hole and most blind-hole work
• High-speed steel construction withstands the heat and wear of production tapping
• H3 thread limit supports close-tolerance fits in a variety of materials
• 4 straight flutes promote chip clearance in short-chipping materials
• No coolant-through requirement simplifies tooling setup

Compatibility

Compatible with materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Fits standard tap wrenches and machine tapping heads sized for the 9/16 shank. Part of OSG Series 101.

Installation Notes

Secure the tap in a properly sized tap wrench or tapping head before use. Ensure the workpiece is clamped securely and the pilot hole is drilled to the correct tap drill diameter for a 9/16-12 thread before beginning the tapping operation. Apply a suitable cutting fluid for the material being tapped to extend tool life and improve thread quality. Never force a tap against resistance; back off periodically to break chips and clear flutes.