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Standard USA Bolt Hex Head and Hex Nut Dimensions
(All dimensions in units of mm unless otherwise specified.)
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Hex
Head
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Standard
Hex Nut
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Heavy
Hex Nut
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Reduced
Standard Hex Nut
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MS21043
Reduced Hex Nut
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USA
Size Desig- nation
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Standard
Hex Head Socket Size
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Width
Across Flats,
W
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Width
Across Corners,
C
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Nut
Socket Size (inch)
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Nut
Height, H
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Width
Across Flats, W
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Width
Across Corners, C
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Socket
Size (inch)
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Socket
Size (inch)
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Nut
Socket Size (inch)
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Nut
Height, H
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Width
Across Flats, W
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Width
Across Corners, C
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Washer
Face Diameter,
Dw
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0
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not
app.
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1
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not
app.
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2
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not
app.
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0.1875
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1.65
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4.65
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5.18
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3
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not
app.
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0.1875
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1.85
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4.70
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5.10
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4
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not
app.
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0.2500
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2.25
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6.25
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7.05
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0.15625
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2.96
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4.343
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5.233
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6
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not
app.
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0.3125
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2.85
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7.85
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8.95
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0.2500
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0.18750
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3.36
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5.258
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6.198
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8
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0.2500
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6.30
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7.10
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0.34375
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3.05
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8.50
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9.80
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0.21875
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4.24
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6.198
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7.366
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10
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0.3125
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7.80
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8.85
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0.3750
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3.10
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9.10
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11.70
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0.25000
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4.49
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7.036
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8.382
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12
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0.2500
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0.4375
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11.00
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12.40
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0.4375
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5.60
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11.00
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12.60
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0.5000
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0.31250
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5.44
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8.814
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10.668
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0.3125
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0.5000
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12.30
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14.10
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0.5000
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6.85
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12.30
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14.25
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0.5625
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0.37500
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6.63
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10.643
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13.208
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0.3750
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0.5625
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14.10
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16.10
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0.5625
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8.15
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14.10
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16.10
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0.6875
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0.43750
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15.748
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0.4375
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0.6250
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15.95
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18.05
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0.6875
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9.25
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17.20
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19.80
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0.5000
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0.7500
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0.7500
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0.8750
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0.5625
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0.8750
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0.8750
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0.6250
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0.9375
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0.9375
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1.0625
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0.7500
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1.1250
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1.1250
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1.2500
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0.8750
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1.3125
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1.3125
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1.4375
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1.0000
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1.5000
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1.5000
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1.6250
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1.1250
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1.6875
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1.6875
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1.8125
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1.2500
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1.8750
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1.8750
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2.0000
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1.3750
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2.0625
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2.0625
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2.1875
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1.5000
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2.2500
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2.2500
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2.3750
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For a hexagon with non-rounded corners, C = W / cos(30°); and C = 2a, where a is length of hexagon side.
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