The Parker Hex Coupling 316 Stainless Steel is a hex bore coupling made of 316 stainless steel. It has a 1-1/16" nominal size, 1-1/8" outside diameter, 15/16" bore diameter, and 1/2" length. This general purpose hex coupling is rated for pressures up to 5000 psi and temperatures up to 800°F. It has a zinc yellow chromate plating and meets military specification MIL-C-81562. The hex coupling creates a rigid connection between two male threaded ends.