Osg 1115200 Straight Flute Tap 3/4-16 Unf Plug Hss

Product Description

The OSG 1115200 is a straight flute plug tap designed for cutting right-hand internal threads to the 3/4-16 UNF standard. Built from high-speed steel with a bright, uncoated finish, it produces clean threads in a range of ferrous and non-ferrous materials. The plug chamfer provides a moderate lead-in, making it well suited for through-hole applications and blind holes with adequate clearance. At 4.25 inches overall length with a 2-inch thread length and a 0.59-inch shank diameter, this tap fits standard tap holders and machines used in production and repair threading operations. The H2 thread limit ensures consistent dimensional control on the finished thread.

This tap is appropriate for general machining work on aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is commonly used in machine shops, maintenance facilities, and manufacturing lines where 3/4-16 UNF threaded holes are required. The straight flute geometry works best in shorter-chipping materials and through-hole configurations where chip evacuation is not a limiting factor. Machinists and tool-and-die technicians are the typical users of this tool.

Key Features

• 3/4-16 UNF thread form with H2 thread limit for consistent tolerance control
• Plug chamfer provides a moderate lead-in suitable for through-hole and open blind-hole applications
• High-speed steel construction for durability across a broad range of workpiece materials
• 4-flute straight flute design optimized for shorter-chipping materials such as cast iron and aluminum
• Bright, uncoated finish compatible with a wide variety of cutting fluids and lubricants
• Right-hand thread direction, standard for most general-purpose threading applications

Compatibility

Designed as an OEM-style replacement or standard production tap for use in any application requiring 3/4-16 UNF right-hand internal threads in aluminum, cast aluminum, cast iron, and low- to high-carbon steel workpieces.

Installation Notes

This tap is intended for use by qualified machinists in manual or CNC tapping operations. Always ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled pilot hole before engaging the cut. Use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Do not reverse the tap before chips have cleared, particularly in blind-hole applications.