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This SAE Metric Aerospace Standard (MA) covers metric double end flare nut wrenches that are designed with the following requirements: a Non-distorting usage. b Possessing the strength, clearances, and internal wrenching design to be used on hydraulic tube fittings that conform to the requirements of SAE J514. c Transmitting torque to tube fittings without bearing on the apex of fitting wrenching points. Inclusion of dimensional data in this document is not intended to imply that all of the products described herein are stock production sizes. Consumers are requested to consult with manufacturers concerning lists of stock production sizes.

This SAE Aerospace Standard (AS) covers open box end flare nut wrenches. These wrenches are designed for nondistorting usage by transmitting torque to tube fittings without bearing on the apex of the fitting wrenching surfaces.