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METAL SEALS
Ultra Seal offers a range of Metal O and Metal C seals for use in severe environments, for instance where high pressure and temperature have to be supported simultaneously.
When choosing a particular metal seal design, the following considerations should be made to ensure the best possible sealing integrity
- The load should be applied as close as possible to the sealing line of the seal
- Seating load is dependant upon cross section/material thickness/heat treatment/groove depth and material. A guide to typical loads are shown in the tables for O or C seals
- Surface finishes should be as noted for the sealed medium and the preparation of the surface finishes should be considered prior to manufacture
- Choice of a plating/coating will improve sealing as this helps fill any small surface irregularities in the hardware. Silver is the most widely used plating.
Metal O seals are manufactured from hollow tubes and can be pressure filled if required.
Metal O Seal – Internal Pressure.
All dimensions are in mm and prior to plating/coating.
For plated or coated seals, increase the cavity O.D. by 2x the plating/coating thickness.
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SEAL
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CAVITY
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Free Height
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I.D.
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Cavity O.D.
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I.D. Max.
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Depth
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W
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R
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Seal O.D Minus
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Seal O.D Plus
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Tol
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Seal I.D. Minus
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Min/Max
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Min
|
Max
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0,89
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2,30
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0,13
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+0,13
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2,29
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0,64/0,70
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1,40
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0,25
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1,58
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3,43
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0,13
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+0,13
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3,81
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1,20/1,27
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2,29
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0,38
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2,39
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5,08
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0,25
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+0,13
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5,59
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1,95/2,00
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3,18
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0,51
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3,18
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6,86
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0,25
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+0,13
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7,37
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2,50/2,67
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4,06
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0,76
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3,96
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8,38
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0,40
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+0,13
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9,53
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3,20/3,30
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5,08
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1,27
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4,78
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10,16
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0,40
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+0,13
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11,43
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3,80/3,94
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6,35
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1,52
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6,35
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13,46
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0,50
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+0,20
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15,24
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5,10/5,20
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8,89
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1,52
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Metal O Seal – External Pressure.
All dimensions are in mm and prior to plating/coating.
For plated or coated seals, decrease the cavity I.D. by 2x the plating/coating thickness
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SEAL
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CAVITY
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Free Height
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O.D.
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Cavity I.D.
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O.D. Min.
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Depth
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W
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R
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Seal I.D. Plus
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Seal I.D. Minus
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Tol
+0,000
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Seal I.D. Plus
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Min/Max
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Min
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Max
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0,89
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2,03
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0,00
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-0,13
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2,29
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0,64/0,70
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1,40
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0,25
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1,58
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3,43
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0,00
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-0,13
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3,881
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1,20/1,27
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2,29
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0,38
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2,39
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5,08
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0,13
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-0,13
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5,59
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1,95/2,00
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3,18
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0,51
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3,18
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6,86
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0,13
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-0,13
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7,37
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2,50/2,67
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4,06
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0,76
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3,96
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8,38
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0,25
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-0,13
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9,53
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3,20/3,30
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5,08
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1,27
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4,78
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10,16
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0,25
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-0,13
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11,43
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3,80/3,94
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6,35
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1,52
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6,35
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13,46
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0,25
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-0,20
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15,24
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5,10/5,20
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8,89
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1,52
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Metal C Seals
Metal C seals are die formed from strip material and are probably the most widely used metal resilient seal. They offer lower seating loads and higher degrees of springback than metal O seals.
Metal C Seals - Internal Pressure
All dimensions are in mm and prior to plating/coating.
For plated or coated seals, increase the cavity O.D. by 2x the plating/coating thickness.
Both seal designs can be manufactured in non-circular shapes.
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SEAL
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CAVITY
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Free Height
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O.D
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Cavity I.D.
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O.D. Min.
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Depth
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W
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L
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Seal I.D. Plus
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Seal ID Minus
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Tol
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Seal I.D. Plus
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Min/Max
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Min
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Max
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1,57
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2,67
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0,25
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See Table
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3,12
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1,295/1,245
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1,65
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0,508
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2,39
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3,92
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0,25
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See Table
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4,44
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1,956/1,854
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2,41
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0,762
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3,18
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5,08
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0,25
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See Table
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5,59
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2,642/2,525
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3,18
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1,143
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4,78
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7,62
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0,25
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See Table
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8,13
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3,937/3,875
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4,83
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1,778
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6,35
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10,16
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0,25
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See Table
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10,66
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5,207/5,055
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6,35
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2,286
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Metal C Seals – External Pressure
All dimensions are in mm and prior to plating/coating.
For plated or coated seals, decrease the cavity I.D. by 2x the plating/coating thickness
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SEAL
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CAVITY
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Free Height
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O.D
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Cavity I.D.
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O.D. Min.
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Depth
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W
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L
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Seal I.D. Plus
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Seal ID Minus
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Tol
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Seal I.D. Plus
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Min/Max
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Min
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Max
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1,57
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2,67
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0,30
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See Table
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2,95
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1,295/1,245
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1,65
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0,508
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2,39
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4,06
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0,30
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See Table
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4,44
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1,956/1,854
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2,41
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0,762
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3,18
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5,08
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0,30
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See Table
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5,97
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2,642/2,525
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3,18
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1,143
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4,78
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7,65
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0,40
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See Table
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8,97
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3,937/3,875
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4,83
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1,788
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6,35
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10,21
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0,40
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See Table
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11,99
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5,207/5,055
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6,35
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2,286
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Cavity Tolerance Range for Metal C Seals Internal and External Pressure
For plated or coated seals, increase the tolerance by 2x the plating/coating thickness. Do not adjust the cavity depth
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CAVITY OD
RANGE
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INTERNAL PRESSURE
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CAVITY ID
RANGE
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EXTERNAL PRESSURE
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UP TO 23
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-0,00/+0,025
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UP TO 23
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+0,00/-0,025
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24-52
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-0,00/+0,051
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24-52
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+0,00/-0,051
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53-95
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-0,00/+0,076
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53-76
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-0,00/-0,076
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96-139
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-0,00/+0,102
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77-127
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-0,00/-0,102
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140-190
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-0,00/+0,152
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128-178
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-0,00/-0,152
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191-266
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-0,00/+0,203
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179-254
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-0,00/-0,203
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267-393
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-0,00/+0,305
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255-381
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-0,00/-0,305
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394-517
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-0,00/+0,381
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382-505
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-0,00/-0,381
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Metal C Seal OD and ID Tolerances
For plated or coated seals, increase the tolerance by 2x the plating/coating thickness.
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CAVITY OD
RANGE
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INTERNAL PRESSURE
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CAVITY ID
RANGE
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EXTERNAL PRESSURE
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UP TO 52
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+0,00/+0,051
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UP TO 52
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+0,51/-0,00
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53-95
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+0,00/+0,076
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53-76
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+0,76/-0,00
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96-139
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+0,00/+0,102
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77-127
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-0,00/-0,00
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140-190
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+0,00/+0,152
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128-178
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-0,00/-0,00
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191-266
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+0,00/+0,203
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179-254
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-0,00/-0,00
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267-393
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+0,00/+0,305
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255-381
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-0,00/-0,00
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394-517
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+0,00/+0,381
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382-505
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-0,00/-0,00
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