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MIL-DTL-1222 Studs, Bolts, Screws And Nuts For Applications Where A High Degree Of Reliability Is Required; General Specification ForThis specification covers standard studs, hex cap screws, and heavy hex bolts in nominal standard diameters of 1/4 inch to 4 inches, nuts in nominal standard diameters of 1/4 inch to 3 inches, and socket head cap screws in nominal standard diameters of 1/4 inch to 1 1/2 inches for submarine safety and other applications where a high degree of reliability is required \(see 6.1\).

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MIL-DTL-1222J
A.1.2.7 Field 7  Field 7 represents the n9 minal length of `fasteners in
o
1
/  6ths of an inch.  Use one digit for fasteners /  6 and smaller and 2 digits for
1
1
5
fasteners / inch and larger.  Use "0" to represent a nut.
8
A.1.2.8 Field 8. Field 8 represents the material type and, when there is
more than one condition, the condition.
a)
GA
signifies
grade B7.
b)
GB
signifies
grade B16.
c)
GC
signifies
grade 2.
d)
GD
signifies
grade 2H.
e)
GE
signifies
grade 4.
f)
GF
signifies
grade 5.
g)
GG
signifies
grade 7.
h)
GH
signifies
grade 8.
i)
GI
signifies
grade A574.
j)
GJ
signifies
grade 4340.
k)
SA
signifies
annealed grade 304, 305, or 384.
l)
SB
signifies
cold worked grade 304, 305, or 384.
m)
SC
signifies
annealed grade 316.
n)
SD
signifies
cold worked grade 316.
o)
SE
signifies
annealed grade 321 or 347.
p)
SF
signifies
cold worked grade 321 or 347.
q)
SH
signifies
condition T grade 410, 416, or 416Se.
r)
SI
signifies
condition H grade 410, 416, or 416Se.
s)
SJ
signifies
condition I grade 410, 416, or 416Se.
t)
SK
signifies
condition T grade 431.
u)
SL
signifies
condition H grade 431.
v)
SM
signifies
condition I grade 431.
w)
SN
signifies
grade 630.
x)
CA
signifies
grade 462.
y)
CB
signifies
grade 464.
z)
CC
signifies
grade 482.
aa)
CD
signifies
grade 510.
bb)
CE
signifies
grade 544.
cc)
CF
signifies
grade 632.
dd)
CG
signifies
grade 655.
ee)
CH
signifies
grade 661.
ff)
CI
signifies
grade 670.
gg)
CJ
signifies
grade 675.
hh)
NA
signifies
alloy 400.
ii)
NB
signifies
alloy 405.
jj)
NC
signifies
grade 500.
kk)
ND
signifies
grade 625.
ll)
AA
signifies
grade 2024.
mm)
AB
signifies
grade 6061.
nn)
AC
signifies
grade 7075.
oo)
TA
signifies
grade T7.
A.1.2.9 Field 9.  Field 9 represents option of locking element.
a) "N" signifies no locking element.
b) L signifies a locking element.
48



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