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System of Measurement
Inch
Metric
Screw Size
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Material
Aluminum
Brass
Cast Iron
Stainless Steel
Steel
Washer Type
Beveled
Clipped
Dished
Flat
Split
Thickness
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Finish
Black Oxide
Corrosion-Resistant Coated
Dyed
Galvanized
Nickel Plated
Zinc Plated
Zinc Yellow-Chromate Plated
Washer Designation
General Purpose
Oversized
Undersized
USS
Performance
Corrosion Resistant
High Strength
Lightweight
Fastener Strength Grade/Class
ISO Class 8.8
ISO Class 10.9
SAE Grade 8
Hardness
B
r
i
n
e
l
l
3
2
B
r
i
n
e
l
l
9
5
B
r
i
n
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l
l
1
2
0
R
o
c
k
w
e
l
l
B
4
0
R
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c
k
w
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l
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B
5
0
R
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l
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B
5
2
R
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B
5
3
R
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l
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B
5
5
R
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k
w
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l
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B
5
6
R
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c
k
w
e
l
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B
6
0
R
o
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k
w
e
l
l
B
6
8
R
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c
k
w
e
l
l
B
7
5
R
o
c
k
w
e
l
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B
7
6
R
o
c
k
w
e
l
l
B
8
3
R
o
c
k
w
e
l
l
B
8
4
Color
Black
Blue
Specifications Met
ASME B18.21.1
ASTM B36
DIN Standard
ISO Standard
Overall Height
0.135"
0.167"
0.187"
0.197"
DFARS Specialty Metals
Compliant
Exempt
Not Compliant
RoHS
Compliant
Compliant with Exemptions
Not Compliant
REACH
Compliant
Not Compliant
Export Control Classification Number (ECCN)
EAR99
Diameter
0.250"
0.300"
0.355"
0.375"
0.438"
0.468"
0.500"
0.531"
0.562"
0.625"
0.728"
0.750"
0.812"
0.987"
1.000"
1.015"
1.219"
1.593"
Fastener Strength Rating
Medium
High
Clipped Width
0.312"
0.359"
0.360"
0.430"
0.446"
0.450"
0.460"
0.484"
0.609"
0.610"
0.630"
0.648"
0.702"
0.740"
0.757"
0.797"
0.820"
0.850"
0.860"
0.952"
1.040"
1.070"
1.075"
1.203"
1.265"
1.275"
1.360"
1.422"
1.485"
1.594"
1.703"
1.922"
2.093"
2.140"
14.4 mm
14.9 mm
18.2 mm
19.4 mm
23.3 mm
23.6 mm
28.2 mm
29.5 mm
Top OD
1.375"
1.625"
1.875"
2.000"
2.250"
2.275"
2.500"
Number of Pieces
386
620
Container Features
Compartmented
Lid Chart
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