Parker 4FSC6N-316 Tube Fitting NPT Female Connector A LOK Series Lot of 5 Fittings

Parker A-LOK 316 Stainless Steel Tube Fitting, 1/4 in. Tube OD x 3/8 in. Female NPT Connector (4FSC6N-316) – Lot of 5

The Parker A-LOK 4FSC6N-316 Female NPT Connector is a high-precision, instrument-grade compression fitting engineered for secure, leak-tight connections between fractional tubing and male NPT threaded pipe in critical analytical, chemical, and bioprocessing fluid systems. Built around Parker's proven two-ferrule A-LOK design, this fitting utilizes a precision-machined front ferrule for gas-tight sealing and a geometry-controlled back ferrule for superior mechanical grip without stressing the tubing wall. Constructed from corrosion-resistant 316 stainless steel, the 4FSC6N connector connects a 1/4 inch outer diameter (OD) tube to a 3/8 inch female NPT thread. Supplied as a lot of 5 fittings, this hardware package provides high-reliability fluid containment under extreme pressure, vibration, and thermal cycling conditions.

Technical Performance & Structural Attributes

• Two-Ferrule A-LOK Mechanical Grip: Features a dual-ferrule system that distributes gripping force evenly, providing vibration-resistant hold and zero-leak sealing capability up to the full working pressure rating of the tubing.
• 316 Stainless Steel Construction: Provides high tensile strength and superior corrosion resistance against aggressive chemical media, solvents, and environmental exposure.
• Silver-Plated Nut Threads: Internal nut threads are silver-plated to eliminate thread galling and ensure consistent makeup torque during assembly and remake.
• Precision NPT Thread Profile: Machined with clean, burr-free 3/8" Female NPT threads for reliable sealing when paired with PTFE tape or thread sealant.

Product Specifications

• Catalog / Part Number: 4FSC6N-316
• Primary Manufacturer: Parker Hannifin Corporation (Instrumentation Products Division)
• Product Series: A-LOK Series Compression Tube Fittings
• Fitting Style: Female NPT Tube Connector (Tube to Female Pipe)
• Connection Port 1 (Tube Side): 1/4 in. Outer Diameter (OD) Compression Tube Fitting
• Connection Port 2 (Threaded Side): 3/8 in. Female NPT Thread
• Material Composition: 316 Stainless Steel (ASTM A276 / A479)
• Pressure Rating: Rated to match or exceed maximum allowable working pressure of standard 316SS tubing
• Operating Temperature Range: -325°F to 1200°F (-198°C to 648°C)
• Packaging Configuration: Lot of 5 Fittings

Key Benefits & Applications

• Analytical & Process Instrumentation: Ideal for connecting sample lines, chromatography systems, gas distribution manifolds, and pressure transmitters.
• Bioprocessing & Chemical Transfer: Secures high-purity gas and liquid lines in bioprocessing skids, reactor vessels, and pilot plant installations.
• High-Pressure Gas & Vacuum Lines: Dual-ferrule design prevents tube blow-out under high-pressure gas impulse or deep vacuum applications.
• Reusable Assembly Integrity: Can be disconnected and remade multiple times without compromising seal tightness or structural integrity.

All product names, logos, and brands are property of their respective owners. Parker and A-LOK are registered trademarks of Parker Hannifin Corporation.