O-ring face seal fittings can, and should, be torqued to the recommended specifications. This is because the connection seal is made by an elastomeric seal against metal. The lack of metal-on-metal contact means that only the O-ring is being deformed in assembly and reassembly. This sealing method is very forgiving and, when assembled to the recommended torque specifications, will create a leak-free seal every.For brass, aluminum (and other soft metals) decrease torque value of the table below by 35%, however F.F.W.R. is the same. time.