Osg 1171602 Straight Flute Tap 3/8-24 Unf Hss

Product Description

The OSG 1171602 is a straight flute plug tap designed for cutting internal threads in a wide range of ferrous and non-ferrous metals. Sized at 3/8-24 UNF with three flutes and a plug chamfer, this tap follows the Unified National Fine thread standard and is manufactured from high-speed steel for durability under repeated use. It carries a 3B class of fit and an H3 thread limit, making it suitable for applications where consistent, close-tolerance threading is required. Thread length is 1.25 inches and overall length is 2.9375 inches. Machinists, maintenance technicians, and tool-and-die professionals typically use this tap in manual or machine tapping operations.

This tap is suited for threading aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer style - featuring a moderate lead-in of several tapered threads - makes it appropriate for through-hole and moderately deep blind-hole applications where a starting tap has already been used or where material conditions allow direct engagement. It fits standard tap handles and machine tool collets compatible with the 3/8-24 shank size and is sold individually.

Key Features

• 3/8-24 UNF thread form with 3B class of fit for close-tolerance internal threads
• H3 thread limit for consistent fit across production runs
• Plug chamfer provides a balanced lead-in suitable for through-holes and moderately deep blind holes
• High-speed steel construction handles ferrous and non-ferrous materials including cast iron and various carbon steels
• Right-hand thread direction, the standard orientation for general-purpose threading
• Three flutes promote chip evacuation in short-chipping materials

Compatibility

Designed for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Compatible with standard tap handles and machine tapping setups accepting a 3/8-24 UNF tap. Part of the OSG Series 103 straight flute tap line.

Installation Notes

Machinists and maintenance technicians should ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled hole before engagement. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. For machine tapping, set spindle speed according to material and tap diameter recommendations from the tooling manufacturer. Avoid over-torquing in hand-tapping operations, especially in softer materials like aluminum, to prevent tap breakage.