TM 9--2350--292--20--20720 00--5TORQUE LIMITS -- CONTINUED0720 00FASTENER GRADEIn addition to being classified by thread type, threaded fasteners are also classified by material. The most familiarfastener classification system is the SAE grading system (Table 5).Table 5. SAE Screw and Bolt MarkingsSCREWSBOLTSSAE GRADE 2NO MARKINGSAE GRADE 64 RADIAL DASHES90APARTSAE GRADE 32 RADIAL DASHES180APARTSAE GRADE 75 RADIAL DASHES72APARTSAE GRADE 53 RADIAL DASHES120APARTSAE GRADE 86 RADIAL DASHES60APARTMarkings On Hex LocknutsGRADE A -- No MarksGRADE B -- 3 MarksGRADE C -- 6 MarksGRADE A -- No NotchesGRADE B -- One NotchGRADE C -- Two NotchesGRADE A -- No MarkGRADE B -- Letter BGRADE C -- Letter CTORQUE LIMITS FOR ENGINEThe following tables list lubricants and torques for fasteners used on the AVDS--1790--8CR Engine.HOW TO USE TORQUE TABLESa. Measure the diameter of the screw, stud, nut, or pipe plug you are installing.b. Use the appropriate table for nuts and bolts (Table 6), pipe plugs (Table 7) or studs (Table 8).c. Under the heading SIZE, look down the left hand column until you find the diameter of the screw, stud, nut or pipeplug you are installing, then read across the table to find the proper torque.
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