TM 9--2520--215--34 0086 00--5 TORQUE LIMITS AND STUD SELECTION – CONTINUED 0086 00 FASTENER GRADE In addition to being classified by thread type, threaded fasteners are also classified by material. The most familiar fastener classification system is the SAE grading system (Table 5). TABLE 5 SAE SCREW AND BOLT MARKINGS SCREWS BOLTS SAE GRADE 2 SAE GRADE 6 NOMARKING 4 RADIAL DASHES 90_ APART SAE GRADE 3 2 RADIAL DASHES SAE GRADE 7 180_ APART 5 RADIAL DASHES 72_ APART SAE GRADE 5 32 RADIAL DASHES SAE GRADE 8 120_ APART 6 RADIAL DASHES 60_ APART Markings On Hex Locknuts GRADE A--No Marks GRADE A--No Mark GRADE B--3 Marks GRADE B--Letter B GRADE C--6 Marks GRADE C--Letter C GRADE A--No Notches GRADE B--One Marks GRADE B--Two Marks STUD SELECTION PART NUMBER PITCH DIAMETER RANGE HOLE PITCH DIAMETER STUD RESULTANT INTERFERENCE FIT 8355863 A 0.9536--09541 0.9574--0.9580 0.0034--0.0044 B 0.9542--0.9547 0.9581--0.9586 0.0034--0.0044 8351875 A 0.9548--0.9553 0.9587--0.9593 0.0035--0.0045 B 0.9554--0.9559 0.9594--09599 0.0035--0.0045 8351876 A 0.9560--0.9565 0.9600--09605 0.0034--0.0045 B 0.9566--0.9572 (OVERSIZE) 0.9606--09611 0.0034--0.0045 8351877 A 0.9573--0.9578 0.9612--09617 0.0034--0.0044 8355863 B 0.9579--0.9584 0.9618--09623 0.0034--0.0044