Osg 1122300 Straight Flute Tap 7/16-20 Unf 4 Flute Hss

Product Description

The OSG 1122300 is a straight flute bottoming tap designed for cutting 7/16-20 UNF internal threads in a wide range of metallic workpieces. Built from high-speed steel with a bright, uncoated finish, this tap features a bottoming chamfer that allows threading to the bottom of blind holes with minimal unthreaded depth. It carries an H3 thread limit for consistent tolerance control in production and repair applications. With 4 flutes and right-hand thread direction, it is suited for use in conventional tapping operations on CNC machining centers, drill presses, and manual tapping stands.

This tap is used in machine shops, maintenance facilities, and manufacturing environments where precision UNF threads are required in blind or through-hole applications. The bottoming chamfer style makes it particularly useful as the final tap in a tapping sequence after a taper or plug tap has started the thread. Common material applications include aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High-speed steel construction for durability across a broad range of metals
• H3 thread limit for controlled tolerance in UNF threading applications
• 4 straight flutes for chip management in through-hole and shallow blind-hole work
• Right-hand thread direction, bright uncoated finish, no coolant-through design
• Series 101 designation for straightforward replacement and procurement

Compatibility

Designed for use in standard 7/16-20 UNF tapping applications across aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Compatible with conventional tapping chucks and holders sized for the 0.323-inch shank diameter.

Installation Notes

Installation is performed by machinists and tool-and-die technicians. Secure the tap in a properly sized tapping chuck or holder before use. Always ensure the workpiece is clamped firmly and the spindle is properly aligned to prevent tap breakage. When used as the final tap in a bottoming sequence, confirm the taper and plug taps have been run through the hole first to reduce torque load on the bottoming tap.