Osg 1233405 Spiral Point Tap 5/8-18 Unf Tin Hss

Product Description

The OSG 1233405 is a spiral point tap designed for cutting internal threads in a wide range of materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, this tap handles 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, making it suited for through-hole threading applications. With 3 flutes and a right-hand thread direction, it produces 5/8-18 UNF threads to a 3B class of fit at an H3 thread limit. Overall length is 3.813 inches with a thread length of 1.91 inches. Licensed machinists and tool-and-die professionals are the primary installers of this tool.

This spiral point tap is used in production and maintenance machining environments where through-hole tapping is required. The 5/8-18 UNF thread form is common in precision mechanical assemblies, hydraulic fittings, and structural fastener applications found in both industrial and commercial settings. The TiN coating extends tool life and reduces friction during cutting, making this tap a reliable choice for high-volume tapping operations or repetitive maintenance work. It is part of OSG Series 105 and is sized for use in standard tap holders and CNC tapping heads that accept a 0.48-inch shank diameter.

Key Features

• 5/8-18 UNF thread form with 3B class of fit and H3 thread limit for precise tolerance control
• High-speed steel construction provides durability across a broad range of workpiece materials
• TiN coating reduces friction, extends tool life, and improves chip flow
• Plug chamfer with 3 flutes optimized for through-hole tapping applications
• Right-hand thread direction, no coolant-through requirement, non-interrupted thread design
• Compact 0.48-inch shank diameter compatible with standard tap holders and CNC setups

Compatibility

Designed for use in standard tap holders, tapping heads, and CNC machining centers that accept a 0.48-inch shank diameter and are configured for 5/8-18 UNF right-hand thread cutting in through-hole applications.

Installation Notes

This tap is installed and operated by qualified machinists in manual or CNC tapping operations. Always secure the workpiece firmly and ensure the tap holder is properly aligned before beginning the threading cycle. Power down or disengage the spindle before changing tooling. Follow standard speeds and feeds for the workpiece material and coating type; refer to OSG Series 105 application guidelines and applicable ANSI standards for thread tolerances.