Osg 1753708 Spiral Flute Tap 5/8-18 Unf 4 Flute Ticn

Product Description

The OSG 1753708 is a spiral flute tap designed for cutting right-hand internal threads to a 5/8-18 UNF specification in demanding materials. Built from powdered metal and coated with TICN (titanium carbon nitride) for extended tool life, this tap features a modified bottoming chamfer and an H3 thread limit for tight, accurate 3B class of fit threads. With 4 flutes and a 15-degree helix angle, the spiral geometry evacuates chips upward out of the hole, making it well suited to blind-hole tapping operations where chip buildup is a concern. The overall length is 3-13/16 inches and the tap weighs 0.19 pounds.

This tap is intended for machining and manufacturing applications where close-tolerance internal threads are required in difficult-to-machine metals. Rated material applications include alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. The modified bottoming chamfer allows threading close to the bottom of a blind hole. It is typically used in CNC machining centers, manual mills, and drill press setups by machinists and tool-and-die professionals requiring consistent 3B fit results in production or maintenance environments.

Key Features

• 5/8-18 UNF right-hand thread form with H3 thread limit for 3B class of fit tolerance
• TICN coating increases surface hardness and reduces friction for longer tool life in tough alloys
• Powdered metal construction provides enhanced wear resistance over standard HSS
• Modified bottoming chamfer allows threading close to the base of blind holes
• 4-flute spiral design at 15-degree helix angle promotes upward chip evacuation
• No coolant-through feature — suitable for use with external cutting fluid application

Compatibility

Rated for use in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloy workpieces requiring 5/8-18 UNF internal threads to a 3B class of fit.

Installation Notes

Installation and use of this tap should be performed by qualified machinists familiar with tapping feeds, speeds, and cutting fluid requirements for the target workpiece material. Secure the workpiece fully before tapping and ensure the tap is properly aligned to prevent tap breakage. Power down the machine spindle and verify zero motion before changing or inspecting tooling. Follow the machine tool manufacturer's recommended RPM and feed rate for the workpiece material and tap diameter.