Osg 1125200 Straight Flute Tap 3/4-16 Unf Hss Plug

Product Description

The OSG 1125200 is a straight flute tap designed for cutting 3/4-16 UNF right-hand internal threads in a range of ferrous and non-ferrous metals. Built from high-speed steel (HSS) with a bright/uncoated finish, it features a plug chamfer style with 4 flutes and a 3B class of fit with H3 thread limit. Overall length is 4-1/4 inches, thread length is 2 inches, and the shank diameter measures 0.59 inches. The plug chamfer provides a moderate lead-in, making it suitable for through-hole tapping applications. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.

This tap is intended for tapping through holes in materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It performs in standard production and maintenance environments where a 3/4-16 UNF thread form is required. The 4-flute straight flute geometry works well in shorter-chipping materials and provides good thread quality at moderate feed rates. It is part of the OSG Series 101 line of standard hand and machine taps.

Key Features

• 3/4-16 UNF thread size with right-hand thread direction
• 4 straight flutes for stable chip control in shorter-chipping metals
• Plug chamfer style for through-hole tapping with moderate lead-in
• H3 thread limit and 3B class of fit for standard tolerance threading
• High-speed steel construction with bright/uncoated finish
• No coolant-through requirement - compatible with standard flood or manual lubrication

Compatibility

Designed for use in standard tap holders, tapping heads, and CNC machine tool spindles accepting the appropriate shank diameter. Compatible with materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel per OSG Series 101 application data.

Installation Notes

Secure the tap in a properly sized tap holder or chuck before operation; never run a tap in a loose or undersized holder. Ensure the workpiece is firmly fixtured and the pilot hole is drilled to the correct tap drill diameter for a 3/4-16 UNF thread before tapping. Apply appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Follow shop safety practices and applicable OSHA standards when operating drilling and tapping equipment.