TABLE III.
Mechanical property values for socket head cap screws.
Full-sized
Machined specimens from fasteners or parent
fasteners
barstock
Nominal
Heat
Rockwell
Elongation Reduction
Material
treatment or
diameter
Tensile
Yield hardness
Tensile
Yield
of area
in 4D
condition
(inches)
strength strength
strength
strength
percent
percent
ksi min ksi min
ksi min
ksi min
min
min
1
Hardened and ½ or less
180
155
C39-45
180
155
10
33
A574, 4340
1
Tempered
C37-45
170
153
10
33
Over ½
170
153
3
5
3
4
384, 316,
80
30
10
30
/ or less
80
30
8
2
Annealed
321, 347,
5
4
Over /
70
26
70
26
20
30
304, 305
8
5
5
5
5
5
5
5
T
All sizes
125-150
95
C25-43
125
95
20
5
5
410 ,416 ,
5
5
5
5
5
5
5
H
All sizes
180-220
135
C36-43
180
125
12
5
416Se
5
5
5
5
5
5
5
All sizes
110 MIN
90
C20-26
110
90
20
I
5
5
5
5
5
5
5
H
All sizes
125-150
95
C25-43
125
95
20
5
5
5
5
5
5
5
5
431
HT
All sizes
180-220
135
C36-43
180
125
12
5
5
5
5
5
5
5
All sizes
110 MIN
90
C20-26
110
90
20
I
As Formed or
5
5
5
5
5
5
400
Stress
All sizes
80
40
80
40
20
Relieved
5
5
5
5
5
5
Annealed and Less than 1
130
90
C24-35
130
90
20
5
500
5
5
5
5
5
5
age hardened 1 and over
130
85
C24-35
130
85
20
5
5
5
5
5
5
2¼ or less
120
60
B85-C35
120
60
30
5
625
Annealed
5
5
5
5
5
5
50
B85-C35
110
50
25
Over 2¼
110
Notes:
1 The commercial specification requires a proof test instead of a full size yield strength test.
2 The equivalent commercial condition is "CW."
3 The commercial specification has a higher minimum requirement.
4 The commercial specification does not require this test for some or all of the fasteners.
5 There is no commercial fastener specification for this fastener.
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