Osg 1762901 Spiral Flute Tap 3/8-24 Unf Modified Bottoming

Product Description

The OSG 1762901 is a spiral flute tap designed for cutting 3/8-24 UNF internal threads in ferrous materials. It features a 45-degree right-hand helix that pulls chips up and out of the hole, making it well-suited for blind-hole tapping where chip evacuation is critical. The modified bottoming chamfer allows threads to be cut close to the bottom of a hole without sacrificing thread quality. Manufactured from vanadium high-speed steel with a steam oxide coating, this tap offers good lubricity and wear resistance across a range of steel workpiece materials. Class of fit is 2B with an H5 thread limit for consistent, inspectable results.

This tap is intended for use in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel. The modified bottoming design makes it a practical choice in precision machining, maintenance, and repair applications where threads must be formed near the bottom of a blind hole. It is commonly used by machinists, tool-and-die makers, and maintenance professionals working in manufacturing, aerospace, automotive, and general fabrication environments. The 3/8-24 UNF thread form is standard in applications requiring fine-pitch fasteners for higher clamping force or vibration resistance.

Key Features

• 45-degree right-hand spiral flute for efficient chip evacuation in blind holes
• Modified bottoming chamfer cuts threads close to the bottom of a hole
• Vanadium high-speed steel construction for extended tool life in steel materials
• Steam oxide coating improves lubricity and reduces built-up edge
• H5 thread limit and 2B class of fit for dimensionally consistent threads
• Right-hand thread direction, compatible with standard tapping setups

Compatibility

Designed for tapping 3/8-24 UNF threads in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Part of the OSG Series 303 spiral flute tap line.

Installation Notes

This tap should be installed and operated by a qualified machinist or maintenance technician familiar with tapping procedures. Always secure the workpiece and use appropriate cutting fluid or tapping compound for the workpiece material before starting. Ensure the tap is aligned perpendicular to the workpiece surface to prevent tap breakage and thread misalignment. Do not exceed the recommended feed rate for the material being tapped, and back off periodically to break chips if tapping by hand.