Osg 1122100 Straight Flute Tap 7/16-20 Unf Taper Hss

Product Description

The OSG 1122100 is a straight flute hand tap designed to cut 7/16-20 UNF right-hand internal threads in a variety of metals. It features a taper chamfer for easy thread starting and is ground to an H3 thread limit for consistent dimensional control. Manufactured from high-speed steel with a bright uncoated finish, it delivers reliable performance across general-purpose tapping applications. The tap measures 3-5/32 inches overall length with a 1-7/16 inch thread length, making it suited for through-hole and shallow blind-hole work. Machinists, tool-and-die makers, and maintenance technicians commonly use this tap for production and repair operations.

This tap is appropriate for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It fits standard production tapping scenarios in machine shops, fabrication facilities, and maintenance environments. The 4-flute straight flute design is well suited for through-hole applications where chip evacuation is straightforward and consistent thread form is the priority. The taper chamfer style provides gradual engagement, reducing torque requirements on entry.

Key Features

• 7/16-20 UNF thread form, right-hand, H3 thread limit for dimensional consistency
• Taper chamfer for gradual thread engagement and reduced starting torque
• 4 straight flutes optimized for through-hole tapping with clean chip flow
• High-speed steel construction with bright uncoated finish
• No coolant-through requirement - suited for hand tapping and standard machine tapping
• Compatible with aluminum, cast iron, low-, medium-, and high-carbon steel workpieces

Compatibility

Designed as a general-purpose OEM-style straight flute tap for 7/16-20 UNF threading operations across standard production and maintenance applications in compatible metals as noted by the manufacturer.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with tapping procedures. Always secure the workpiece and ensure the tap is properly aligned before engagement to prevent tap breakage. Power down any machine tool and follow lockout/tagout procedures before changing or inspecting taps in a machine setup. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality.