TM-9-2520-215-34
CROSS-DRIVE TRANSMISSION ASSEMBLY
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 2005
TM-9-2520-215-34 - Page 477 of 508
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
NO MARKING
4 RADIAL DASHES
90
_
APART
SAE GRADE 3
2 RADIAL DASHES
SAE GRADE 7
180
_
APART
5 RADIAL DASHES
72
_
APART
SAE GRADE 5
3 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 Mark
GRADE B--Two Marks
Table 6. 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
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