Part Number: 6408 / 6408H

SAE ORB Hex Head Plug

Product Overview

The Delphi Fittings Part 6408 (and 6408H variant) is an SAE O-Ring Boss (ORB) Hex Head Plug, specifically designed to securely seal unused female SAE ORB ports in hydraulic systems. This plug features a male SAE ORB thread with an integrated O-ring groove for a superior, leak-proof seal against the port's boss. The prominent external hexagonal head allows for easy and robust installation or removal using a standard wrench. Manufactured from high-quality carbon steel and zinc-plated for corrosion resistance, the Part 6408 / 6408H plug provides a reliable solution for terminating ORB connections in various industrial and mobile hydraulic applications.

Key Features & Specifications

Material	High-Grade Carbon Steel
Thread Type	Male SAE O-Ring Boss (ORB) (per SAE J1926-1 / ISO 11926-1)
Drive Style	External Hexagonal Head for wrench tightening.
Sealing Mechanism	O-ring (supplied with the plug) seals against the chamfered boss in the female ORB port.
Corrosion Protection	Standard Zinc Plating for enhanced durability.
Primary Function	To securely seal unused female SAE O-Ring Boss ports.
Working Pressure	Suitable for high-pressure hydraulic applications. Specific ratings vary by size.
O-Ring Material	Typically Buna-N (Nitrile) 90 Durometer. Viton® or other materials available upon request for specific applications.

Commonly Available Sizes (Part #6408 / 6408H Series)

Delphi Fittings offers the SAE ORB Hex Head Plug in a full range of standard ORB sizes to effectively seal various port dimensions. Sizes are typically denoted by ORB dash numbers.

Examples include (Male ORB):

6408-02 / 6408H-02: -02 (5/16-24) ORB Male
6408-03 / 6408H-03: -03 (3/8-24) ORB Male
6408-04 / 6408H-04: -04 (7/16-20) ORB Male
6408-05 / 6408H-05: -05 (1/2-20) ORB Male
6408-06 / 6408H-06: -06 (9/16-18) ORB Male
6408-08 / 6408H-08: -08 (3/4-16) ORB Male
6408-10 / 6408H-10: -10 (7/8-14) ORB Male
6408-12 / 6408H-12: -12 (1-1/16-12) ORB Male
6408-14 / 6408H-14: -14 (1-3/16-12) ORB Male
6408-16 / 6408H-16: -16 (1-5/16-12) ORB Male
6408-20 / 6408H-20: -20 (1-5/8-12) ORB Male
6408-24 / 6408H-24: -24 (1-7/8-12) ORB Male
6408-32 / 6408H-32: -32 (2-1/2-12) ORB Male

Note: The 'H' variant (6408H) may denote specific material grades or design features; always confirm specifications. For unlisted sizes, please contact our sales team.

Applications

The Part 6408 / 6408H SAE ORB Hex Head Plug is widely used for:

Securely sealing unused SAE O-Ring Boss ports on hydraulic manifolds, valves, pumps, cylinders, and filter housings.
Terminating fluid lines or connections during system maintenance, testing, or modification.
Preventing contamination and leakage from open ORB ports.
Use in mobile equipment (construction, agriculture), industrial machinery, and various high-pressure hydraulic systems.

Installation & Usage Guidelines

Ensure the female ORB port (especially the boss sealing surface) and the male threads and O-ring groove of the plug are clean, undamaged, and free from contaminants.
Verify the O-ring is correctly sized for the plug, lubricated with system-compatible fluid (e.g., hydraulic oil), and properly seated in its groove on the plug.
Thread the ORB hex head plug into the female ORB port by hand until the O-ring makes contact with the port's boss and the plug face is snug.
Use a correctly sized wrench on the external hex head to tighten the plug to the manufacturer's recommended torque specification for the ORB size. This ensures proper O-ring compression and a secure seal.
Avoid over-tightening, which can damage the O-ring or the threads.

Why Choose Delphi Fittings Part 6408 / 6408H?

Superior Sealing: The O-ring provides an excellent, high-pressure seal in ORB ports, far exceeding traditional pipe plugs.
Easy Installation/Removal: The external hex head allows for straightforward application of torque with standard wrenches.
Robust and Durable: Manufactured from high-grade carbon steel for reliable performance in demanding environments.
Standard Compliance: Designed to meet SAE J1926 specifications for ORB connections.
Wide Size Range: Available in a comprehensive range of ORB sizes to suit various port requirements.
Quality Manufacturing: Produced under Delphi Fittings' ISO 9001:2015 certified quality management system.

Get a Quote for Part 6408 / 6408H - SAE ORB Hex Head Plug

For reliable sealing of unused SAE O-Ring Boss ports, the Part 6408 / 6408H Hex Head Plug is an industry-standard solution. Contact Delphi Fittings for wholesale pricing, bulk order information, and expert assistance with your hydraulic fitting needs.

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