Midland Industries SS6408-HH-10 Hollow Hex Plug Orb

Product Description

The MIDLAND INDUSTRIES SS6408-HH-10 is a hollow hex plug with a 5/8-inch Male O-Ring Boss (ORB) connection, manufactured from 316 stainless steel. This fitting is used to cap or plug ORB ports in hydraulic, pneumatic, and fluid-handling systems while maintaining a leak-free seal through the O-ring interface. At 0.649 inches in length and weighing just 0.1 pounds, it is a compact, lightweight component suited to tight-space installations. The 3/8-inch hex drive and 7/8-14 thread pitch make installation straightforward with standard hex tooling. Rated to 1000 degrees F operating temperature, this plug is appropriate for high-temperature service environments. Installation is typically performed by licensed plumbers, pipefitters, or hydraulic system technicians.

This plug fits SAE O-Ring Boss port applications across industrial, hydraulic, and fluid-power systems. It is part of the SS6408-HHP Series of stainless SAE ORB hollow hex plugs and is well suited for use in applications requiring corrosion resistance and elevated temperature performance. Typical install scenarios include capping unused ports on manifolds, valve bodies, and hydraulic cylinders in both stationary and mobile equipment. The 316 stainless steel construction provides strong resistance to corrosion in wet, chemical, or marine-adjacent environments.

Key Features

• 316 stainless steel construction for corrosion resistance in demanding environments
• Male O-Ring Boss connection provides a reliable, leak-free seal without thread sealant
• Rated to 1000 degrees F operating temperature for high-heat service
• 3/8-inch hex drive allows installation with standard hex or socket tooling
• 7/8-14 thread pitch conforms to SAE ORB port standards
• Compact at 0.649 inches in length, suitable for tight port access

Compatibility

Designed as an OEM-style replacement or service plug for SAE O-Ring Boss ports in hydraulic, pneumatic, and fluid-handling systems requiring a 5/8-inch male ORB fitting.

Installation Notes

Installation should be performed by a qualified pipefitter, hydraulic technician, or licensed plumber. Always depressurize and de-energize the system fully before removing or installing any port plug. Use a calibrated torque wrench with the appropriate hex socket to avoid over-tightening, which can damage the O-ring or port threads. Verify O-ring condition and seat cleanliness before torquing to final position.