DELPHI FITTINGS
Product Overview
The Delphi Fittings Part 6401 is a straight adapter designed to provide a reliable connection between a female SAE O-Ring Boss (ORB) port and a female NPTF (National Pipe Taper Fuel / Dryseal) port. This fitting features a male SAE O-Ring Boss thread on one end and a male NPTF pipe thread on the other. It is essential for integrating components with ORB connections into systems utilizing NPTF threads, or vice-versa. Manufactured from high-quality carbon steel and zinc-plated for corrosion resistance, the Part 6401 adapter ensures a secure, leak-resistant transition between these two distinct hydraulic connection standards.
Key Features & Specifications
| Material | High-Grade Carbon Steel |
|---|---|
| End 1 Configuration | Male SAE O-Ring Boss (ORB) (per SAE J1926-1 / ISO 11926-1) |
| End 2 Configuration | Male NPTF Pipe (Dryseal) (per ANSI B1.20.3 / SAE J476) |
| Body Style | Straight Adapter with Hex Body for wrench tightening. |
| Sealing Mechanism | ORB End: O-ring seal compressed into the port's boss. NPTF End: Metal-to-metal seal on the tapered Dryseal threads. |
| Primary Function | To connect a female SAE O-Ring Boss port to a female NPTF port. |
| O-Ring Material (for ORB end) | Typically Buna-N (Nitrile) 90 Durometer. Viton® or other materials available upon request. |
| Plating & Finish | Cr3+ Trivalent Zinc Clear (ASTM B117 salt spray tested) |
| Port Standard | SAE J1926-1 / ISO 11926-1 (SAE Straight Thread O-Ring Boss) |
Commonly Available Sizes (Part #6401 Series)
Delphi Fittings manufactures standard and jump port sizes for Part 6401. Thread dimensions, port specifications, and hex sizes for standard production series are detailed below:
| Delphi Part # | End 1 Specification | End 2 Specification | Hex Body Size |
|---|---|---|---|
| 6401-04-02 | -04 (7/16-20) ORB Male | 1/8" NPTF Male | 9/16" |
| 6401-04-04 | -04 (7/16-20) ORB Male | 1/4" NPTF Male | 9/16" |
| 6401-06-04 | -06 (9/16-18) ORB Male | 1/4" NPTF Male | 11/16" |
| 6401-06-06 | -06 (9/16-18) ORB Male | 3/8" NPTF Male | 11/16" |
| 6401-08-06 | -08 (3/4-16) ORB Male | 3/8" NPTF Male | 7/8" |
| 6401-08-08 | -08 (3/4-16) ORB Male | 1/2" NPTF Male | 7/8" |
| 6401-10-08 | -10 (7/8-14) ORB Male | 1/2" NPTF Male | 1" |
| 6401-12-12 | -12 (1-1/16-12) ORB Male | 3/4" NPTF Male | 1-1/4" |
| 6401-16-16 | -16 (1-5/16-12) ORB Male | 1" NPTF Male | 1-1/2" |
Need non-standard dash combinations, jump port sizes, alternative elastomer seal compounds (EPDM / HNBR / Viton® FKM), or custom alloy runs? Delphi manufactures custom hydraulic adapters to customer blueprint.
Specific Applications & Hydraulic Circuit Routing
Part 6401 fittings provide leak-free fluid power conveyance in demanding mobile and stationary equipment circuits:
- Hydraulic Valve Manifolds & Blocks: Provides zero-clearance, leak-tight port connections on mobile and industrial hydraulic manifold blocks utilizing Part 6401.
- Pumps, Motors & Cylinders: Connects fluid power lines directly to SAE straight-thread ORB ports on gear pumps, piston motors, and hydraulic cylinders.
- Thermal Cycling & High Vibration Systems: Elastomeric O-ring maintains full seal integrity where tapered pipe threads might back off or weep under intense machine vibration.
Installation & Assembly Guidance
- O-Ring Lubrication: Always inspect and lightly lubricate the elastomeric O-ring with clean system hydraulic fluid prior to thread engagement to avoid pinching or tearing.
- Straight Fitting Engagement: For straight fittings, hand-thread into the port until the hex shoulder bottoms firmly against the spotface, then torque to SAE J1926 specifications.
- Adjustable Fitting Orientation: For elbows and tees, back off the locknut and washer completely. Thread fitting into port until washer contacts face, then back out counter-clockwise (max 360°) to align, and tighten locknut.
- Dual Wrench Security: Hold the adapter body firmly with a backup wrench while securing mating hose swivel nuts or tube connections.
Why Source Part 6401 from Delphi Fittings?
- SAE J1926 & ISO 11926 Compliance: Precision CNC machined with precise O-ring retaining undercuts to ensure complete interchangeability with North American and European hydraulic equipment.
- ASTM B117 Superior Corrosion Resistance: Heavy trivalent zinc clear finish delivers exceptional protection against white and red rust in demanding outdoor and mobile environments.
- 100% Optical Thread Verification: All male and female threads undergo strict go/no-go optical gauge inspection to guarantee flawless field threading without binding.
- Factory-Direct OEM & Distributor Programs: Manufactured directly at our ISO 9001:2015 certified facility in Yuhuan, China, backed by mill test reports (MTR) and volume distributor pricing.
Get a Quote for Part 6401 - SAE ORB Male x NPTF Pipe Male Adapter
Direct OEM container-load and distributor replenishment pricing, complete material test reports (MTR), and inspection samples available upon inquiry. Connect with our engineering sales team for rapid quotations and delivery schedules.
Complementary & Mating Hydraulic Fittings
Commonly paired with Part 6401 in hydraulic valve manifolds, power units, and industrial fluid power circuits:
