OPERATOR, UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
This work package provides general torque data to allow you to determine the torque requirements if a specific value is not
listed in the text. Specific values are provided for the most critical requirements. Most threaded fasteners are covered by
specifications that define mechanical properties such as tensile strength, yield strength, proof load and hardness. These
specifications are carefully considered in initial selection of fasteners for a given application. To assure continued
satisfactory performance, replacement fasteners should be of the correct strength, nominal diameter, thread pitch, length and
Most original equipment fasteners (English or metric) are identified with markings or numbers indicating the strength of the
fastener. These markings are identified in the paragraphs that follow. Attention to these markings is important in assuring
that the proper replacement fasteners are used.
BOLT STRENGTH IDENTIFICATION, ENGLISH SYSTEM
Grade 1 or 2
Identification marks correspond to bolt strength - increasing number of slashes represent increasing strength.
BOLT STRENGTH IDENTIFICATION, METRIC SYSTEM
Identification class numbers correspond to bolt strength - increasing numbers represent increasing strength.