Scientific Cutting Tools MS33649-4S Porting Tool 1/4 in Tube

Product Description

The SCIENTIFIC CUTTING TOOLS MS33649-4S is a porting tool designed to machine precision spotface seats on tube port fittings conforming to AS 5202 and MS 33649 standards. It produces a 0.888-inch spotface diameter with a 30-degree seal angle, creating the correct seating surface for UNJF-threaded tube port connections. The plain pilot style locates in the existing port bore during cutting. With 4 straight flutes and a bright, uncoated finish, this tool is used by machinists and maintenance professionals working on hydraulic, pneumatic, and fluid system tubing assemblies. It weighs 0.25 pounds and measures 3.12 inches in overall length.

This porting tool is intended for use with 1/4-inch outside diameter tubing at Tube Dash Number 4. It is applied in the fabrication or repair of tube port fittings where AS 5202 and MS 33649 compliant spotface geometry is required. Typical workpieces are metal tube assemblies found in industrial, aerospace, and fluid power systems. The 1/2-inch shank diameter makes it compatible with standard milling machine and drill press chucks used in shop and field maintenance environments.

Key Features

• 0.888-inch spotface diameter machines AS 5202 and MS 33649 compliant port seats
• 30-degree seal angle ensures correct seating geometry for tube port connections
• Plain pilot style with 0.392-inch minimum and 0.4565-inch maximum pilot diameter for positive bore location
• 4 straight flutes for clean, controlled material removal on tube workpieces
• UNJF thread type compatibility for aerospace and industrial fluid system ports
• 1/2-inch shank diameter and 2.0-inch shank length fit standard machine tool holders

Compatibility

Designed for use with 1/4-inch OD tubing at Tube Dash Number 4, conforming to AS 5202 and MS 33649 port standards. Workpiece compatibility is listed as tubes.

Installation Notes

This tool is installed and operated by machinists or qualified maintenance technicians using a milling machine, drill press, or compatible rotary tool holder. Secure the 1/2-inch shank firmly in the chuck before operation and ensure the workpiece is clamped against movement. Power down and de-energize or depressurize any system before machining existing port fittings. Follow applicable shop safety and fluid system standards when reworking ports on pressurized assemblies.