Scientific Cutting Tools MS33649-5R Porting Tool Reamer

Product Description

The SCIENTIFIC CUTTING TOOLS MS33649-5R is a porting tool reamer designed to machine precision spotface seats in tube fittings and port connections. It produces a 0.95-inch spotface diameter for 5/16-inch tube outside diameter applications and carries a Tube Dash 5 designation. The reamer pilot ranges from a minimum of 0.455 inches to a maximum of 0.5195 inches, with a pilot length of 0.593 inches, and uses a straight, 4-flute cutting geometry for clean, consistent seat surfaces. Overall tool length is 3.12 inches. This tool is used by aerospace, hydraulic, and precision fluid-system technicians who require conformance to AS 5202 and MS 33649 standards.

This porting tool is suited for spotfacing tube port seats in metallic workpieces where UNJF-threaded fitting connections are required. It is commonly used in aerospace, defense, and industrial hydraulic or pneumatic plumbing applications where MS 33649 port geometry must be held to specification. The 30-degree seal angle matches the standard cone seat geometry used in these systems. The 1/2-inch shank diameter fits standard drill press, CNC, or hand-held toolholders used in maintenance and fabrication environments.

Key Features

• 0.95-inch spotface diameter for accurate seat preparation on 5/16-inch OD tube ports
• 4-flute straight flute design for controlled material removal and clean surface finish
• 30-degree seal angle conforms to MS 33649 and AS 5202 port seat geometry
• UNJF thread type compatibility for aerospace and high-pressure fluid system fittings
• Bright/uncoated finish on a 1/2-inch shank for broad toolholder compatibility
• Compact head length of 1.24 inches allows use in confined port locations

Compatibility

Designed for use on tube port workpieces requiring MS 33649 and AS 5202 spotface geometry, specifically for 5/16-inch OD tube connections with a Tube Dash 5 designation and UNJF thread form.

Installation Notes

This tool is installed by machinists, aerospace maintenance technicians, and hydraulic system fabricators using a drill press, milling machine, or appropriate hand-held power tool. Secure the workpiece firmly before operation and ensure the pilot engages the existing port bore squarely to prevent seat runout. Always follow applicable shop safety procedures and applicable aerospace maintenance manuals when reworking flight-critical port seats. Inspect the finished spotface for concentricity and surface finish before assembly.