Osg 1131702 Straight Flute Bottoming Tap 3/8-24 Unf

Product Description

The OSG 1131702 is a straight flute bottoming tap designed for cutting 3/8-24 UNF internal threads in a wide range of metallic workpieces. Built from high-speed steel, it carries a 2B class of fit and an H4 thread limit, making it suitable for standard tolerance threaded hole applications. The bottoming chamfer geometry allows threading close to the bottom of blind holes, which is critical in close-tolerance assemblies. With 4 flutes and a 1-1/4 inch thread length, this tap is sized for production and maintenance tapping operations across machine shops, fabrication facilities, and field maintenance environments.

This tap is applied in general-purpose tapping where a 3/8-24 UNF right-hand thread is required. It is suited for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Its straight flute design makes it most effective in through-hole and short blind-hole applications where chip control is managed by the operator or setup. It fits standard tap holders and tapping fixtures used in manual, drill press, and CNC tapping operations.

Key Features

• Bottoming chamfer for threading to the base of blind holes
• 3/8-24 UNF thread size with right-hand thread direction
• 4 straight flutes for consistent chip formation in ferrous and non-ferrous materials
• H4 thread limit and 2B class of fit for standard tolerance applications
• High-speed steel construction for durability across multiple material types
• Compact overall length of 2-15/16 inches fits standard tap holders

Compatibility

Designed for use in materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Fits standard 3/8-24 UNF tap holder and drive configurations.

Installation Notes

Tapping operations should be performed by a qualified machinist or maintenance technician familiar with thread-cutting procedures. Secure the workpiece and use appropriate cutting fluid for the material being tapped to extend tool life and maintain thread quality. Ensure the tap is properly aligned with the drilled hole before applying torque to avoid tap breakage. Follow shop safety practices and applicable standards when operating tapping equipment.