M-Series ARO Pneumatic Automatic Female Threaded Coupler. Automatic couplings interchange with ARO 210/310 designs and Hansen Series 210/310 • Manual couplings interchange with Parker 50-Series and Amflo Type 'B'. Rated pressure for connected Steel Coupler & Steel Plug: 300 PSI (20 bar) Maximum Working and 2,600 PSI (179 bar) Burst. Rated pressure for connected Steel Coupler & Brass Plug: 300 PSI (20 bar) Maximum Working and 5,000 PSI (345 bar) Burst. Optional Package/Box Quantity : 10 ; Material : Nickel Plated Brass Body, Steel Sleeve ; Maximum OD : 1.06" ; Thread : NPT ; Body Size : 1/4" ; Temperature Range : -40°F to +250°F (-40°C to +121°C) ; Thread Size : 1/4"; Length : 1.72" ; Hex : 13/16"