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Typical USA Flat Washer Dimensions (All dimensions in units of mm unless otherwise specified.)
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Standard
USS Flat Washer
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Standard
SAE Flat Washer
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Flat
Fender Washer, Standard
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Flat
Fender Washer, Wide
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NAS1149
Standard- diameter Flat Washer
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NAS620
Reduced- diameter Flat Washer
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USA Size
Desig- nation
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Inner Diam-
eter,
D1
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Outer Diam-
eter,
D2
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Inner Diam-
eter,
D1
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Outer Diam-
eter,
D2
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Outer Diam-
eter,
D2
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Outer Diam-
eter,
D2
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Inner Diam-
eter,
D1
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Outer Diam-
eter,
D2
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Inner Diam-
eter,
D1
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Outer Diam-
eter,
D2
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0
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1
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2
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6.25
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3
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6.95
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4
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8.00
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3.175
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8.115
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6
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9.90
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7.90
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19.05
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3.785
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9.7155
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8
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11.22
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9.40
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22.10
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10
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12.90
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12.05
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25.30
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31.90
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12
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14.40
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0.2500
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19.05
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15.95
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25.75
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0.3125
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22.60
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17.70
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0.3750
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26.00
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20.90
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0.4375
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26.00
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23.60
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0.5000
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27.05
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0.5625
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30.10
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0.6250
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0.7500
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0.8750
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1.0000
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1.1250
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1.2500
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1.3750
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1.5000
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