PurposeTo tighten and torque B183S40, bulkhead fitting, 112W1003, rear spar assembly to 810-1030 in-lbs (ST2580-545-1 or -2 is used before ST2580-546-1 or -2Used WithTorque WrenchWhere UsedBulkhead fittingWrench Size3-1/2Opening Shape6Wrench End TypeSocketWrench Body TypeStraightWrench VariationStandardDrive TypeInternal SquareDrive Size1/2Head Outer Diameter4.75Overall Length1.70Fastener NumberB183S40