Back-up Washers
Leather back-up washers are engineered support components used in conjunction with primary sealing elements to extend pressure capabilities and prevent extrusion or distortion under load. Monarch-McLaren produces these washers to meet stringent military or industrial specifications, including MIL-W-5521 or KK-L-164 A formats.
Typical Applications
Back-up washers are often used in hydraulic and pneumatic assemblies, valves, and other systems where pressure support or a second line of defense against seal extrusion is required.
Material & Impregnation
Our leather washers can be impregnated with Thiokol, wax, or oil to improve durability, abrasion resistance, and temperature tolerance — ensuring consistent performance even in demanding environments.
Key Benefits
- Custom sizes from 1⁄32″ to 20″ or larger available.
- Enhanced extrustion resistance when paired with primary seals.
- High strength and wear resistance.
Why Leather Matters in Back-Up Washers
Leather’s dimensional stability and toughness make it ideal for backing up primary seals, helping maintain system reliability under sustained loads.
O.D.: Outside Diameter
I.D.: Inside Diameter
T: Thickness of Leather
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Tell us your application details and specifications so we can provide a custom estimate or consult on the right leather packing solution for your needs.
