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Seal Master Washers

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Seal Master Product Series

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Seal Master is Estco's own unique rubber to metal bonded washer that are designed to create a permanent seal in or seal out in any operating environment, whether natural or industrial. Seal Master is ideal for cushioning and vibration control applications as well as sealing.

Typical sealing applications for Estco's Seal Master washers include:

  • Metal roofs and siding where the expansion and contraction of metal require a permanent resilient seal.
  • Dishwashers - to avoid leaks
  • Marine - structural and electronic
  • Air Filters - dust control
  • Automotive - air cleaner assemblies, engine block heater, emission control equipment, body sealing


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Item #

Item Name

Screw and Bolt Size (mm)

Screw and Bolt Size (U.S. Standard)

Backing Inner Diameter (mm)

Backing Inner Diameter (Decimal)

Outer Diameter (mm)

Outer Diameter(inch)

E-ESPM0001 Seal Master Washers 2.9 No. 4 3.3 .120 6.3 1/4
E-ESPM0002 Seal Master Washers 2.9 No. 4 3.3 .120 9.5 3/8
E-ESPM0003 Seal Master Washers 2.9 No. 4 3.3 .120 11 7/16
E-ESPM0004 Seal Master Washers 2.9 No. 4 3.3 .120 12 15/32
E-ESPM0005 Seal Master Washers 2.9 No. 4 3.3 .120 13 1/2
E-ESPM0006 Seal Master Washers 2.9 No. 4 3.3 .120 14 35/64
E-ESPM0007 Seal Master Washers 2.9 No. 4 3.3 .120 14 9/16
E-ESPM0008 Seal Master Washers 2.9 No. 4 3.3 .120 15 19/32
E-ESPM0009 Seal Master Washers 2.9 No. 4 3.3 .120 16 5/8
E-ESPM0010 Seal Master Washers 2.9 No. 4 3.3 .120 17.5 11/16
E-ESPM0011 Seal Master Washers 2.9 No. 4 3.3 .120 18.3 23/32
E-ESPM0012 Seal Master Washers 2.9 No. 4 3.3 .120 19 3/4
E-ESPM0013 Seal Master Washers 2.9 No. 4 3.3 .120 20 25/32
E-ESPM0014 Seal Master Washers 2.9 No. 4 3.3 .120 22 7/8
E-ESPM0015 Seal Master Washers 2.9 No. 4 3.3 .120 25 1
E-ESPM0016 Seal Master Washers 2.9 No. 4 3.3 .120 28 1 1/8
E-ESPM0017 Seal Master Washers 2.9 No. 4 3.3 .120 30 1 3/16
E-ESPM0018 Seal Master Washers 2.9 No. 4 3.3 .120 32 1 1/4
E-ESPM0019 Seal Master Washers 2.9 No. 4 3.3 .120 35 1 3/8
E-ESPM0020 Seal Master Washers 2.9 No. 4 3.3 .120 38 1 1/2
E-ESPM0021 Seal Master Washers 2.9 No. 4 3.3 .120 41.3 1 5/8
E-ESPM0022 Seal Master Washers 2.9 No. 4 3.3 .120 44.5 1 3/4
E-ESPM0023 Seal Master Washers 2.9 No. 4 3.3 .120 47.6 1 7/8
E-ESPM0024 Seal Master Washers 2.9 No. 4 3.3 .120 51 2
E-ESPM0025 Seal Master Washers 2.9 No. 4 3.3 .120 57 2 1/4
  Results 1 - 25 of 445 1 2 3 4 5 »