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BS 4 Series O-Ring Size Charts
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BS 4xx Series
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Nominal Size
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Actual Size
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BS
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Inches
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Inches
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Millimetres
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No
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I.D.
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W
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I.D.
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±
|
W
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±
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I.D.
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±
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W
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±
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425
|
4 1/2
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1/4
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4.475
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0.015
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0.275
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0.006
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113.67
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0.38
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6.99
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0.15
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426
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4 5/8
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1/4
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4.600
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0.015
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0.275
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0.006
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116.84
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0.38
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6.99
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0.15
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427
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4 3/4
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1/4
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4.725
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0.015
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0.275
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0.006
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120.02
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0.38
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6.99
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0.15
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428
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4 7/8
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1/4
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4.850
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0.015
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0.275
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0.006
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123.19
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0.38
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6.99
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0.15
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429
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5
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1/4
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4.975
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0.015
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0.275
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0.006
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126.37
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0.38
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6.99
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0.15
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430
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5 1/8
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1/4
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5.100
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0.023
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0.275
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0.006
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129.54
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0.58
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6.99
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0.15
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431
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5 1/4
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1/4
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5.225
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0.023
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0.275
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0.006
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132.72
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0.58
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6.99
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0.15
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432
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5 3/8
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1/4
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5.350
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0.023
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0.275
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0.006
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135.89
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0.58
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6.99
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0.15
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433
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5 1/2
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1/4
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5.475
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0.023
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0.275
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0.006
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139.07
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0.58
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6.99
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0.15
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434
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5 5/8
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1/4
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5.600
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0.023
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0.275
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0.006
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142.24
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0.58
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6.99
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0.15
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435
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5 3/4
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1/4
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5.725
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0.023
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0.275
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0.006
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145.42
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0.58
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6.99
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0.15
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436
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5 7/8
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1/4
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5.850
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0.023
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0.275
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0.006
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148.59
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0.58
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6.99
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0.15
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437
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6
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1/4
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5.975
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0.023
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0.275
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0.006
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151.77
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0.58
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6.99
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0.15
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438
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6 1/4
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1/4
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6.225
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0.023
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0.275
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0.006
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158.12
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0.58
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6.99
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0.15
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439
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6 1/2
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1/4
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6.475
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0.023
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0.275
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0.006
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164.47
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0.58
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6.99
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0.15
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440
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6 3/4
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1/4
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6.725
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0.023
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0.275
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0.006
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170.82
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0.58
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6.99
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0.15
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441
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7
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1/4
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6.975
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0.023
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0.275
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0.006
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177.17
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0.58
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6.99
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0.15
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442
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7 1/4
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1/4
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7.225
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0.030
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0.275
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0.006
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183.52
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0.76
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6.99
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0.15
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443
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7 1/2
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1/4
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7.475
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0.030
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0.275
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0.006
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189.87
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0.76
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6.99
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0.15
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444
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7 3/4
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1/4
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7.725
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0.030
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0.275
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0.006
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196.22
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0.76
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6.99
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0.15
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445
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8
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1/4
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7.975
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0.030
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0.275
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0.006
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202.57
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0.76
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6.99
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0.15
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446
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8 1/2
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1/4
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8.475
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0.030
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0.275
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0.006
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215.27
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0.76
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6.99
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0.15
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447
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9
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1/4
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8.975
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0.030
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0.275
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0.006
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227.97
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0.76
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6.99
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0.15
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448
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9 1/2
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1/4
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9.475
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0.030
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0.275
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0.006
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240.67
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0.76
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6.99
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0.15
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449
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10
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1/4
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9.975
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0.030
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0.275
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0.006
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253.37
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0.76
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6.99
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0.15
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450
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10 1/2
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1/4
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10.475
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0.030
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0.275
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0.006
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266.07
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0.76
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6.99
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0.15
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451
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11
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1/4
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10.975
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0.030
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0.275
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0.006
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278.77
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0.76
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6.99
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0.15
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452
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11 1/2
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1/4
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11.475
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0.030
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0.275
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0.006
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291.47
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0.76
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6.99
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0.15
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453
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12
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1/4
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11.975
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0.030
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0.275
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0.006
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304.17
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0.76
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6.99
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0.15
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454
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12 1/2
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1/4
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12.475
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0.030
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0.275
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0.006
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316.87
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0.76
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6.99
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0.15
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455
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13
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1/4
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12.975
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0.030
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0.275
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0.006
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329.57
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0.76
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6.99
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0.15
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456
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13 1/2
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1/4
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13.475
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0.030
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0.275
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0.006
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342.27
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0.76
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6.99
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0.15
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457
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14
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1/4
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13.975
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0.030
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0.275
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0.006
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354.97
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0.76
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6.99
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0.15
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458
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14 1/2
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1/4
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14.475
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0.030
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0.275
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0.006
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367.67
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0.76
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6.99
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0.15
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459
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15
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1/4
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14.975
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0.030
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0.275
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0.006
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380.37
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0.76
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6.99
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0.15
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460
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15 1/2
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1/4
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15.475
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0.030
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0.275
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0.006
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393.08
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0.76
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6.99
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0.15
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461
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16
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1/4
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15.955
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0.045
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0.275
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0.006
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405.26
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1.14
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6.99
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0.15
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462
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16 1/2
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1/4
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16.455
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0.045
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0.275
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0.006
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417.96
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1.14
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6.99
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0.15
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463
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17
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1/4
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16.955
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0.045
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0.275
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0.006
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430.66
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1.14
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6.99
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0.15
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464
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17 1/2
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1/4
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17.455
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0.045
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0.275
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0.006
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443.36
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1.14
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6.99
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0.15
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465
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18
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1/4
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17.955
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0.045
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0.275
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0.006
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456.06
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1.14
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6.99
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0.15
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466
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18 1/2
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1/4
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18.455
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0.045
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0.275
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0.006
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468.76
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1.14
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6.99
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0.15
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467
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19
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1/4
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18.955
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0.045
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0.275
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0.006
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481.46
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1.14
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6.99
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0.15
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468
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19 1/2
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1/4
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19.455
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0.045
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0.275
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0.006
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494.16
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1.14
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6.99
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0.15
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469
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20
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1/4
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19.955
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0.045
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0.275
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0.006
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506.86
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1.14
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6.99
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0.15
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470
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21
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1/4
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20.955
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0.045
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0.275
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0.006
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532.26
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1.14
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6.99
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0.15
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471
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22
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1/4
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21.955
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0.045
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0.275
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0.006
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557.66
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1.14
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6.99
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0.15
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472
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23
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1/4
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22.940
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0.060
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0.275
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0.006
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582.70
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1.50
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6.99
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0.15
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473
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24
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1/4
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23.940
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0.060
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0.275
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0.006
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608.10
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1.50
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6.99
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0.15
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474
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25
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1/4
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24.940
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0.060
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0.275
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0.006
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633.50
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1.50
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6.99
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0.15
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|
475
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26
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1/4
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25.940
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0.060
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0.275
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0.006
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658.90
|
1.50
|
6.99
|
0.15
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