Osg 1651502608 Spiral Point Tap 3/8-24 Unf Ticn

Product Description

The OSG 1651502608 is a high-performance spiral point tap designed to cut 3/8-24 UNF internal threads in a wide range of ferrous and non-ferrous materials. It features a plug chamfer for through-hole applications and carries a 2B class of fit for standard tolerance threading. Built from powdered metal (grade PMT15) and finished with a TiCN coating, it delivers extended tool life in demanding production environments. The spiral point geometry pushes chips forward ahead of the cutting zone, keeping flutes clear and reducing the risk of chip packing. Machinists, tool-and-die workers, and maintenance technicians use this tap in CNC and manual tapping operations.

This tap is suited for through-hole tapping in materials including alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, and die steel. With an overall length of 3.543 inches and a thread length of 0.751 inches, it fits standard tap holders and extension holders used in vertical machining centers, drill presses, and hand-tapping setups. The H4 thread limit accommodates coated fasteners and applications requiring a slightly looser thread tolerance.

Key Features

• 3/8-24 UNF thread size with 2B class of fit for standard tolerance through-hole threading
• Plug chamfer (approximately 3-5 lead threads) optimized for through-hole applications
• Powdered metal (PMT15) substrate provides higher wear resistance compared to standard HSS
• TiCN coating reduces friction and extends tool life in ferrous and stainless materials
• 3-flute spiral point geometry pushes chips forward to prevent packing in through-holes
• H4 thread limit suitable for use with coated threads and standard tolerance assemblies
• Right-hand thread direction, no coolant-through, non-interrupted thread form

Compatibility

Designed for through-hole tapping in alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, and die steel. Fits standard 3/8-inch tap holders compatible with OSG Series 16515 tooling.

Installation Notes

This tap should be installed by a qualified machinist or tooling technician. Always secure the workpiece and ensure the tapping axis is properly aligned before engaging the tap to prevent tool breakage. Use an appropriate cutting fluid or tapping compound for the specific workpiece material, as dry tapping in steel or stainless steel significantly shortens tool life. Follow applicable shop safety procedures and machine guarding requirements when operating tapping equipment.