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System
of
Measurement
Inch
Metric
Thread
Size
0
0
0
0
-
1
6
0
0
0
0
-
1
2
0
0
0
-
9
0
0
0
-
9
6
0
-
8
0
1
-
6
4
1
-
7
2
2
-
5
6
2
-
6
4
3
-
4
8
3
-
5
6
4
-
4
0
4
-
4
8
5
-
4
0
5
-
4
4
Length
0
.
0
3
9
"
0
.
0
4
"
0
.
0
5
9
"
1
/
1
6
"
5
/
6
4
"
0
.
0
7
9
"
3
/
3
2
"
0
.
0
9
8
"
7
/
6
4
"
0
.
1
1
8
"
1
/
8
"
5
/
3
2
"
3
/
1
6
"
7
/
3
2
"
1
/
4
"
Material
See all
S
t
a
i
n
l
e
s
s
S
t
e
e
l
1
7
-
4
P
H
S
t
a
i
n
l
e
s
s
S
t
e
e
l
1
8
-
8
S
t
a
i
n
l
e
s
s
S
t
e
e
l
3
0
0
S
e
r
i
e
s
S
t
a
i
n
l
e
s
s
S
t
e
e
l
3
0
2
S
t
a
i
n
l
e
s
s
S
t
e
e
l
3
0
3
S
t
a
i
n
l
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s
s
S
t
e
e
l
3
0
4
S
t
a
i
n
l
e
s
s
S
t
e
e
l
3
1
6
S
t
a
i
n
l
e
s
s
S
t
e
e
l
3
1
6
L
S
t
a
i
n
l
e
s
s
S
t
e
e
l
4
0
0
S
e
r
i
e
s
S
t
a
i
n
l
e
s
s
S
t
e
e
l
4
1
0
S
t
a
i
n
l
e
s
s
S
t
e
e
l
4
1
6
S
t
a
i
n
l
e
s
s
S
t
e
e
l
4
3
0
S
t
a
i
n
l
e
s
s
S
t
e
e
l
4
5
0
S
t
a
i
n
l
e
s
s
S
t
e
e
l
A
2
8
6
S
t
a
i
n
l
e
s
s
S
t
e
e
l
A
l
l
o
y
2
0
S
t
a
i
n
l
e
s
s
S
t
e
e
l
B
u
m
a
x
8
8
S
t
a
i
n
l
e
s
s
S
t
e
e
l
S
t
a
i
n
l
e
s
s
S
t
e
e
l
Fastener
Head
Type
12
-
Point
Domed
Eye
Flat
Headless
Hex
Oval
Pentagon
Rounded
Socket
Square
Thumb
T
-
Slot
Drive
Style
Asymmetrical
Drilled
Spanner
External
12
-
Point
External
Hex
External
Pentagon
External
Square
Hex
Hex
with
Pilot
Recess
JIS
One
Way
Phillips
Slotted
Square
Tamper
-
Resistant
Hex
Tamper
-
Resistant
Torx
Tamper
-
Resistant
Torx
Plus
Torx
Torx
Plus
Tri
-
Wing®
Wrench
Flats
Threading
Fully
Threaded
Partially
Threaded
Threaded
on
Both
Ends
Threaded
on
One
End
Unthreaded
Head
Diameter
0
.
0
3
8
"
0
.
0
4
0
"
0
.
0
5
6
"
0
.
0
6
1
"
0
.
0
6
5
"
0
.
0
7
1
"
0
.
0
7
9
"
0
.
0
8
2
"
0
.
0
8
9
"
0
.
0
9
"
3
/
3
2
"
0
.
0
9
6
"
0
.
1
1
"
0
.
1
1
2
"
0
.
1
1
3
"
Socket
Head
Profile
High
Low
Standard
Ultra
Low
Head
Height
0
.
0
0
8
"
0
.
0
1
1
"
0
.
0
1
6
"
0
.
0
1
8
"
0
.
0
2
5
"
0
.
0
2
6
"
0
.
0
2
8
"
0
.
0
3
1
"
1
/
3
2
"
0
.
0
3
2
"
0
.
0
3
3
"
0
.
0
3
5
"
0
.
0
3
6
"
0
.
0
3
7
"
0
.
0
3
8
"
Rounded
Head
Style
Binding
Button
Carriage
Cheese
Fillister
Pan
Round
Truss
Finish
Black
Oxide
Chrome
Plated
Corrosion
-
Resistant
Coated
Galvanic
Barrier
Coated
Passivated
PTFE
Coated
Rubber
Coated
Silver
Plated
Tin
Plated
Titanium
Carbon
Nitride
(TiCN)
Coated
Zinc
Plated
Thread
Pitch
0
.
1
2
5
m
m
0
.
2
m
m
0
.
2
2
5
m
m
0
.
2
5
m
m
0
.
3
m
m
0
.
3
5
m
m
0
.
4
m
m
0
.
4
5
m
m
0
.
5
m
m
0
.
6
m
m
0
.
7
m
m
0
.
7
5
m
m
0
.
8
m
m
1
m
m
1
.
2
5
m
m
Screw
Size
N
o
.
0
0
N
o
.
0
N
o
.
1
N
o
.
2
N
o
.
3
N
o
.
4
N
o
.
5
N
o
.
6
N
o
.
7
N
o
.
8
N
o
.
9
N
o
.
1
0
N
o
.
1
2
N
o
.
1
4
N
o
.
1
7
Thread
Type
A
c
m
e
B
a
l
l
B
S
P
P
B
S
P
T
M
e
t
r
i
c
M
e
t
r
i
c
R
o
u
n
d
e
d
T
r
a
p
e
z
o
i
d
a
l
N
P
T
N
P
T
F
R
o
u
n
d
e
d
A
c
m
e
U
N
U
N
C
U
N
E
F
U
N
F
U
n
i
v
e
r
s
a
l
U
N
R
C
Thread
Direction
Left
Hand
Right
Hand
Right
Hand
and
Left
Hand
Drive
Size
0
.
0
2
8
"
0
.
0
3
5
"
0
.
0
5
0
"
1
/
1
6
"
5
/
6
4
"
3
/
3
2
"
7
/
6
4
"
1
/
8
"
9
/
6
4
"
0
.
1
5
6
"
5
/
3
2
"
3
/
1
6
"
7
/
3
2
"
1
/
4
"
9
/
3
2
"
Specifications
Met
ASME
Standard
ASTM
Standard
DIN
Standard
Federal
Specification
IEC
61340
-
5
-
1
IFI
Standard
ISO
Standard
NAS
SAE
Standard
Thread
Spacing
Coarse
Fine
Extra
Fine
Ultra
Fine
Countersink
Angle
69°
82°
88°
90°
100°
Flat
Head
Profile
Narrow
Standard
Undercut
Wide
Tip
Type
Ball
Blunt
Cone
Cup
Drilling
Extended
Flat
Oval
Pointed
Soft
Swivel
Tensile
Strength
30,000
psi
to
99,999
psi
100,000
psi
or
greater
Not
Rated
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35,565 Products
Fastening and Joining
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5,885 products
Socket Head Screws
With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold
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Fit in countersunk holes for a flush finish
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Used with nuts to create a stronger joint than flat and rounded screws
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Rotate parts around the cylinder under the head to guide and align them during installation
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Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads
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Tighten and loosen by hand without the need for tools
872 products
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A smooth head provides a finished look while a square neck keeps the bolt in place when using a nut
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