Swagelok SS-400-3-4TMT 316 Stainless Steel Male Run Tee

Swagelok SS-400-3-4TMT is a precision-engineered male run tee fitting designed to create a leak-tight connection in fluid and gas systems. This component features two ports for 1/4-inch tube and one port with 1/4-inch male NPT (National Pipe Taper) threads, allowing seamless transition between tubing and threaded connections.

Manufactured from 316 stainless steel, this fitting combines Swagelok's renowned two-ferrule gripping technology with threaded connectivity, making it ideal for instrumentation, process analyzers, and general industrial applications requiring reliable, leak-free performance.

Key Features & Benefits

OEM Genuine Swagelok Part: Ensures proper fit, material compatibility, and maintains system integrity

316 Stainless Steel Construction: Provides excellent corrosion resistance and durability for harsh industrial environments

Two-Ferrule Mechanical Grip: The patented hinging-colleting back ferrule design separates sealing and gripping functions, ensuring reliable performance even under vibration

Dual 1/4" Tube Connections: Two ports feature Swagelok's gaugeable tube fitting ends for secure tube connections

1/4" Male NPT Thread: One port provides tapered pipe threads for direct connection to threaded components, ports, or equipment

Easy Installation: Pre-assembled ferrule sets simplify installation without transmitting torque to the tubing

Gap Inspection Gauge Compatible: Swagelok's gap inspection gauge ensures proper pull-up during installation

Technical Specifications (SS-400-3-4TMT)

Specification Detail

Manufacturer Swagelok Company

Part Number SS-400-3-4TMT ;

Product Type Male Run Tee (Tapered Thread) - Fractional

Material 316 Stainless Steel

Tube Connection 1/4 in. Tube OD (2 ports)

Thread Connection 1/4 in. Male NPT

Thread Series UNF (tube ends), NPT (pipe end)

Thread Class 3A

Seat Angle 20.0 degrees (tube ends)

Leg Length 0.781 in (tube ends nominal), 0.938 in (pipe end nominal)

Overall Length 1.98 in

Surface Treatment Passivated overall

Included Components

This fitting comes complete with pre-assembled ferrules and coupling nuts for the tube connections:

4 Ferrule Sleeves (front and back ferrules for two tube ends) 

2 Short Coupling Nuts 

Design and Engineering

The SS-400-3-4TMT incorporates Swagelok's advanced hinging-colleting back ation Information

For proper installation, follow the official Swagelok Tube Fitting Installation Guide. Key steps include:

Fully insert the tubing into the fitting

Tighten the nut to the finger-tight position

Mark the nut at the 12 o'clock position

Tighten according to specifications (typically 1-1/4 turns for 1/4 in. fittings)

Verify proper pull-up using a Swagelok gap inspection gauge 

Quality and Compliance

Swagelok fittings are engineered to address critical system concerns including:

Gas-tight sealing to minimize fugitive emissions 

Vibration resistance and tube support 

Thermal shock compensation during system startup and shutdown 

Corrosion resistance for demanding environments 

Ordering Information

The manufacturer part number for this 316 stainless steel male run tee is SS-400-3-4TMT. It is also referenced under NSN (National Stock Number) 4730-00-895-8116.

For purchasing, availability, and pricing, please contact your local authorized Swagelok sales and service center. Note that Swagelok may require end-user information for warranty and distribution tracking purposes.

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