Osg 1181300 Straight Flute Tap 3/8-16 Unc Plug Hss

Product Description

The OSG 1181300 is a straight flute hand tap designed to cut 3/8-16 UNC right-hand internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel with a bright, uncoated finish, it features a plug chamfer for general-purpose through-hole and blind-hole tapping. The H5 thread limit holds tight tolerances for a 2B class of fit, making it a reliable choice for production and maintenance work. With three flutes and a 1-1/4-inch thread length, it clears chips effectively in the materials it is rated for. Overall length is 2-15/16 inches.

This tap is suited for threading operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It fits common tapping applications in machining, fabrication, maintenance, and repair environments where a standard 3/8-16 UNC thread form is required. The plug chamfer style makes it appropriate for both hand tapping and machine tapping setups where the tap enters a partially or fully open hole.

Key Features

• 3/8-16 UNC thread form with 2B class of fit and H5 thread limit for consistent tolerance control
• Plug chamfer for versatile use in through holes and deep blind holes
• High-speed steel construction for durability across steel, cast iron, and aluminum workpieces
• Three straight flutes provide chip clearance and stable cutting action
• Bright, uncoated finish - no coating to chip or flake, straightforward resharpening
• Right-hand thread direction; no coolant-through requirement

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. OSG Series 103 straight flute tap designed as an OEM-style replacement or standard tooling option wherever a 3/8-16 UNC plug tap is specified.

Installation Notes

Machinists and maintenance technicians should ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole before beginning the threading operation. Power down any machine tool and verify it is in a safe state before installing or removing the tap from the chuck or holder. Use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Inspect the tap for wear or damage before each use - a dull or chipped tap increases the risk of breakage in the hole.