DK-LOK DUR Reducing Union
The DK-LOK DUR is a reducing union twin-ferrule tube fitting that connects two tube lines of different outside diameters in a straight-through configuration. It provides a leak-free double-ferrule seal on both tube ends. Material is not indicated by this base code, so the alloy must be verified by full part number; 316 stainless and brass variants exist.
Key Features
- Reducing union joins two different tube OD sizes
- Twin (double) ferrule compression seal on each end
- Reusable, predictable swaging make-up
- Available in fractional and metric tube OD sizes
- Leak-tight under heavy vibration, vacuum, and impulse service
- Conforms to ASTM F-1387 (twin-ferrule fitting standard)
Technical Specifications
- Brand: DK-LOK
- Part Code: DUR
- Type: Reducing Union (Tube-to-Tube)
- Fitting Type: Reducing Union
- Ferrule Design: Twin / double ferrule
- Body Material: COMING SOON
- Standard: ASTM F-1387
- Example Rating: DUR-12-4-S (3/4 in x 1/4 in, 316 SS) rated up to 5800 psi
- Temperature Rating: 316 SS material rated -425°F to 1200°F (-253°C to 649°C) per DK-LOK; final rating governed by the tubing and service – call for your application
- Tube OD Range: 1/16 in. to 2 in. (fractional); 2 mm to 38 mm (metric)
- Design Standard: Twin-ferrule fitting, tested to ASTM F1387
- Working Pressure: Rated by tube size and wall thickness per the DK-LOK catalog. Call for quote.
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