Flare to Metric fitting: 6AN to M16 x 1.5MM，the thread size of 6AN is 9/16UNF and that of metric side is M16-1.5mm. Sealing：The AN side of the flare is sealed by a 37 degree angle and the metric thread side is sealed by a NBR rubber o-ring. Maximum Working Pressure: 4000PSI, Working Temperature: - 65 °F to 212 °F.The length from side to side of a hexagon is 0.7inch ,adjustable wrench is highly recommended. Application: This M16 x 1.5 Metric to 6AN male adapter is suitable for connecting oil/fuel/water/fluid/gas hose ends, widely used in oil cooler/Fuel filter/fluid line,etc.