DELPHI FITTINGS
Part Number: 6408-SS / 6408H-SS
SAE ORB Hex Head Plug (Stainless Steel)
Product Overview
The Delphi Fittings Part 6408-SS (and its variant 6408H-SS) is an SAE O-Ring Boss (ORB) Hex Head Plug, meticulously manufactured from high-quality stainless steel (typically Grade 316 SS). This plug is specifically designed to effectively seal unused female ORB ports within hydraulic systems, thereby preventing leakage and protecting the system from external contamination. It features a male SAE O-Ring Boss thread with an integrated O-ring groove and an external hexagonal head, allowing for easy and secure installation or removal using a standard wrench. The superior corrosion resistance of stainless steel makes this plug an essential component for applications in demanding environments, such as marine operations, chemical processing plants, food and beverage facilities, or any system where exposure to corrosive media or stringent hygiene standards is a concern.
Key Features & Specifications
| Material | High-Grade Stainless Steel (Typically 316 SS for optimal corrosion resistance) |
|---|---|
| Configuration | Male SAE O-Ring Boss (ORB) Plug (thread and O-ring groove dimensions conforming to SAE J1926-1 / ISO 11926-1) |
| Head Style | External Hexagonal (Hex) Head for straightforward installation and removal with a wrench. |
| Sealing Mechanism | Utilizes an elastomeric O-ring (seated in the groove on the plug body) which compresses against the chamfered boss of the female ORB port to create a highly reliable, leak-proof seal. |
| Corrosion Protection | Inherent to the stainless steel material; may also be passivated to further enhance surface integrity and corrosion resistance. |
| Primary Function | To securely seal and close off unused female SAE O-Ring Boss ports in hydraulic systems, particularly those constructed from or operating in environments requiring stainless steel. |
| Working Pressure | Designed to safely withstand the pressure ratings of the corresponding female ORB ports. Specific ratings are dependent on the size of the plug. |
| O-Ring Material | Viton® (FKM) is strongly recommended for stainless steel applications to ensure broad chemical compatibility and performance across a wide temperature range. The O-ring is typically supplied with the plug. |
| Variants Note | Part number 6408H-SS may denote a specific characteristic, such as a hollow design or different hex dimensions. Please confirm specific features if the 'H' variant is required. This page primarily describes the standard solid plug. |
Commonly Available Sizes (Part #6408-SS / 6408H-SS Series)
Delphi Fittings offers the Stainless Steel SAE ORB Hex Head Plug in a comprehensive range of sizes, denoted by the ORB dash number, which corresponds to the female ORB port it is designed to seal.
Examples include (ORB Plug Size):
- 6408-02-SS: For -02 (5/16-24 UNF) ORB Port
- 6408-03-SS: For -03 (3/8-24 UNF) ORB Port
- 6408-04-SS: For -04 (7/16-20 UNF) ORB Port
- 6408-06-SS: For -06 (9/16-18 UNF) ORB Port
- 6408-08-SS: For -08 (3/4-16 UNF) ORB Port
- 6408-10-SS: For -10 (7/8-14 UNF) ORB Port
- 6408-12-SS: For -12 (1-1/16-12 UNF) ORB Port
- 6408-16-SS: For -16 (1-5/16-12 UNF) ORB Port
- 6408-20-SS: For -20 (1-5/8-12 UNF) ORB Port
- 6408-24-SS: For -24 (1-7/8-12 UNF) ORB Port
Note: Each plug includes an appropriate O-ring (Viton® recommended for stainless steel applications). If the 6408H-SS variant with specific features is needed, please clarify during inquiry. For unlisted sizes or specific requirements, contact our sales team.
Applications
The Part 6408-SS Stainless Steel ORB Hex Head Plug is essential for:
- Securely sealing off unused SAE O-Ring Boss ports in hydraulic manifolds, valves, pumps, cylinders, and other fluid power components within stainless steel systems or corrosive environments.
- Preventing contamination and leakage from open hydraulic circuit ports during system maintenance, modification, storage, or when certain functionalities are not in use.
- Critical applications in industries such as marine and offshore, chemical processing, food and beverage production, pharmaceutical manufacturing, and any area where exposure to corrosive substances or stringent hygiene standards necessitates the use of stainless steel.
- Maintaining system integrity and safety by ensuring all unused ports are properly sealed.
Installation & Usage Guidelines
- Ensure the female ORB port to be sealed and the Part 6408-SS plug (including its threads, O-ring groove, and O-ring) are meticulously clean, undamaged, and entirely free from any contaminants or debris.
- Verify that the O-ring material (Viton® is recommended for stainless steel and demanding applications) is correct for the specific system fluid, temperature, and pressure. Ensure the O-ring is correctly lubricated with a system-compatible fluid or an appropriate O-ring lubricant.
- Carefully install the lubricated O-ring onto the plug, ensuring it is properly and evenly seated in its groove without being twisted, cut, or pinched.
- Thread the ORB plug into the female ORB port by hand until the O-ring makes initial contact with the port's chamfer and the plug shoulder (if present) seats against the port face.
- Use an appropriately sized wrench on the external hex head of the plug to tighten it to the manufacturer's recommended torque specification for the specific ORB size and stainless steel material. This ensures correct O-ring compression and a secure seal.
- When working with stainless steel fittings, applying a suitable thread lubricant or anti-seize compound (compatible with stainless steel) to the plug threads is crucial to prevent galling during assembly and allow for easier removal if necessary.
Why Choose Delphi Fittings Part 6408-SS / 6408H-SS?
- Superior Corrosion Resistance: Manufactured from high-grade stainless steel (typically 316 SS), offering maximum durability and longevity in harsh, corrosive, or sanitary environments.
- High-Integrity ORB Sealing: Utilizes the industry-proven SAE O-Ring Boss sealing mechanism, ensuring a reliable, leak-proof closure of unused hydraulic ports even under high pressure.
- Ease of Installation and Removal: The external hexagonal head allows for straightforward tightening and loosening using standard wrenches.
- Effective System Protection: Prevents contamination of the hydraulic system and loss of fluid from open ORB ports.
- Full Adherence to Industry Standards: Meets SAE J1926 (ORB) specifications for thread and port compatibility, ensuring proper fit and function.
- Quality-Assured Manufacturing: Produced under Delphi Fittings' rigorous ISO 9001:2015 certified quality management system, guaranteeing consistent high quality and dependable performance.
Get a Quote for Part 6408-SS / 6408H-SS - Stainless Steel SAE ORB Hex Head Plug
For secure, corrosion-resistant, and reliable sealing of unused female ORB ports in your critical hydraulic systems, the Part 6408-SS / 6408H-SS stainless steel plug is an essential high-quality component. Contact Delphi Fittings today for wholesale pricing, bulk order information, and expert technical support.
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