1.1/2" OD Steel Tube Ferrule - 2018-6508 Data: 1" O.D. 690 bar (10,000 psi) hydraulic or 345 bar (5,000 psi). 1.1/4" O.D. 552 bar (8,000 psi) hydraulic or 276 bar (4,000 psi). N.B. Couplings are suitable for the following pressures, up to and including: 3/4" N.B. 690 bar (10,000 psi) hydraulic or 345 bar (5,000 psi) gas. 1" N.B. 552 bar (8,000 psi) hydraulic or 276 bar (4,000 psi) gas. 1.1/2" N.B. 345 bar (5,000 psi) hydraulic or 173 bar (2,500 psi) gas.