Osg 1231602 Spiral Point Tap 3/8-16 Unc Hss

Product Description

The OSG 1231602 is a spiral point tap designed for threading 3/8-16 UNC holes in production and maintenance machining environments. It features a plug chamfer, three flutes, and a right-hand thread direction with an H3 thread limit and 3B class of fit. The tap is manufactured from high-speed steel and finished with an elektraLUBE coating, which reduces friction and heat buildup during cutting. The threaded length is 1.25 inches, and the tap carries a Series 105 designation. It is suited for use with standard tapping heads, CNC machining centers, and hand tapping equipment where UNC threads are required.

The OSG 1231602 is intended for through-hole and blind-hole tapping operations across a broad range of workpiece materials. Its material application range includes aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The plug chamfer provides a gradual lead-in suitable for both through holes and deeper blind holes where chip evacuation is manageable. This tap is a common choice in job shops, manufacturing facilities, and maintenance operations requiring consistent 3/8-16 UNC threads.

Key Features

• 3/8-16 UNC thread form with right-hand cutting direction
• H3 thread limit and 3B class of fit for standard tolerance threading
• Three-flute spiral point geometry pushes chips forward ahead of the tap
• Plug chamfer for versatile use in through holes and moderate-depth blind holes
• High-speed steel construction for durability across a wide material range
• elektraLUBE coating reduces friction and extends tool life in dry or minimal-lubrication applications

Compatibility

Compatible with tapping operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces requiring 3/8-16 UNC internal threads.

Installation Notes

This tap should be installed by a machinist or qualified tradesperson using a properly sized tap holder or tapping head rated for the machine spindle in use. Ensure the workpiece is securely fixtured and the tap is aligned on-axis with the drilled pilot hole before engagement. Disconnect power or place the machine in a safe state before manually changing tooling. Follow applicable shop safety procedures and manufacturer feed rate recommendations for the workpiece material.