AS954 Standard for High Strength Tools covers tools that are specifically designed for wrenching of 12-point aerospace fasteners. The key concept embodied in AS954 is the requirement that the wrenching tool contact the 12-point fastener away from the fastener corner, thereby reducing the tendency to round fastener corners.
This discussion explores the technical merits of this feature and explains the other attributes of the wrenching tools such as thin walls and large bolt clearance that relate to their use on aerospace applications. The evolvement of the standard and the current status of a project to increase the scope of tools covered is explained.
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