This SAE Standard covers specifications and performance requirements for 37??nd 45??ingle and double flares for tube ends intended for use with SAE J512@ SAE J513@ SAE J514@ and ISO 8434-2 connectors. The flares described in this document are intended for use with SAE metallic tube materials. Considerations such as the effects of wall thickness selection for specific working pressures@ identifying appropriate length of thread engagements for specific applications with mating connectors and other associated criteria@ shall be the responsibility of the user. For applicable nominal reference working pressures for hydraulic tubing@ see SAE J1065 and ISO 10763 In an effort to standardize within a global marketplace and ensuring that companies can remain competitive in an international market@ it is the intent of this document to promote the use of metric tube and connector sizes which will lead to one global system guide users to a preferred system reduce complexity eliminate inventory duplications Relationship of SAE Standard to ISO Standard Flares as described in this updated document are compatible with ISO 8434-2 - Metallic tube connections for fluid power and general use - Part 2: 37??lared connectors