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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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TABLE II.
Mechanical property values for bolts, studs and hex cap screws. - Continued
Machined specimens from fasteners or on
Full size fasteners
parent barstock
Heat
Elongation Reduction
treatment Nominal  Tensile
of area,
in 4D
Yield
Proof
Tensile
Yield
diameter strength, strength, stress, Rockwell strength  strength,  percent,  percent,
or
Material condition (inches)
ksi min  ksi min hardness ksi, min  ksi, min
min
min
ksi
316,
All
1
9
Annealed
B95 max
30
75-100
30
20
75
321,
sizes
347,
¾ or
1
8
1
1
65
20
105 -140
105
65
Cold
304,
less
305,  Worked
1
1
1
Over ¾
40
25
90 -140
50
85
384
All
1
5
1
5
1
1
1
10
9
T
95
125 -150
C25 -34
125
95
20
sizes
410,
All
11
11
11
11
11
11
11
416,
I
110-140
90
C20-26
110
90
20
sizes
416Se
All
1
5
1
1
1
5
1
12
12
H
C38 -47
180
135
sizes  180 -220
135
All
9
5
9
1
125-150
H
125
95
C25-34
95
20
sizes
All
11
11
11
11
11
11
11
431
I
110
90
C20-26
110
90
20
sizes
All
9
9
8
9
1
180-220
180
HT
135
C38 -47
135
12
sizes
Annealed
All
630
and age
C28-C38
135
105
16
135-170
105
sizes
hardened
All
1
9
1
1
5
462
25
55 -90
55
20
25
sizes
All
1
1
1
5
1
464 As formed
25
55 -90
55
20
25
sizes
or stress
All
11
11
11
11
11
11
482  relieved
55-90
25
55
20
25
sizes
All
1
1
510
60
35
15
60-90
35
sizes



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© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business

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