5/16 in. x 1/8 in. Brass Poly-Flo x Female NPT Adapter
5/16 in. x 1/8 in. Brass Poly-Flo x Female NPT Adapter
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The 5/16 in. x 1/8 in. Brass Poly-Flo x Female NPT Adapter is a brass Poly-Flo adapter that creates a leak-tight tube connection without flaring the tube end. A ferrule or cutting ring bites into the tube OD as the nut is tightened — forming a metal-to-metal seal rated for high pressure without any tube preparation beyond a clean, square cut. Flareless fittings are the standard in hydraulic instrumentation lines, high-pressure control systems, and OEM equipment where tube flaring is impractical.
Technical Specifications
| Specification | Value |
|---|---|
| Material | Brass (dezincification-resistant) |
| Connection Type | Flareless (ferrule/bite-type or Poly-Flo) |
| Shape | Adapter |
| End Connections | See product title |
| Application | Instrument tubing, hydraulic, fuel lines |
Key Features
- No tube flaring required — cut tube square and assemble
- Ferrule or cutting ring creates metal-to-metal seal rated for high-pressure service
- Brass construction compatible with copper, brass, and compatible aluminum tubing
- Resists vibration loosening better than soft-ferrule compression fittings on rigid tubing
- Standard in hydraulic instrumentation, fuel systems, and OEM control equipment
Common Applications
Hydraulic instrumentation and gauge lines, fuel injection system tubing, high-pressure instrument air, OEM control panel plumbing, and any high-pressure tubing connection on rigid steel or copper tube where flaring tools are not available.
Technical Resources
- SAE 45° vs. Inverted Flare vs. Flareless — Identification Guide
- Tube OD Sizing Reference
- Brass Fitting Types and Sizes Guide
Cross-References
This part is an equivalent for industry part numbers 02666-0502, 1266x5, 266P0502, 266-P-05x02, 266P-5-2, 266PF-5A, 5053K39, 66P-5-2, 66PF-5-2, 9566-52, AP66-P-5X2, F266-5-2, MP66-52, PG66D. Searching one of those? This is your match.