Home | Mica Flat Washers - High-Temperature Electrical Insulation Washers

Mica Flat Washers - High-Temperature Electrical Insulation Washers

Mica flat washers offer outstanding electrical insulation and thermal resistance, maintaining performance at temperatures up to 600°C or higher. They are used in heating elements, electrical equipment, motors, and high-temperature industrial applications where both heat resistance and electrical isolation are essential.

Superior Washer & Gasket Corp manufactures mica washers in standard and custom sizes with ISO 9001:2015 certified quality management. Our high-performance insulating washer capabilities include mica, Kapton, fiberglass, and phenolic options-all made in the U.S.A. to your precise dimensional requirements.

  • High-temperature electrical insulation up to 600°C+
  • Natural mica material for consistent thermal performance
  • Standard and custom mica washer configurations
  • ISO 9001:2015 certified manufacturing
  • Made in the U.S.A.

Showing 51–78 of 78 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

750-35-010

ID 0.25
OD 0.5
Thickness 0.01
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-35-010t

ID
OD
Thickness 0.01
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-36-016

ID 0.257
OD 0.62
Thickness 0.016
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-36-016t

ID
OD
Thickness 0.016
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-37-003

ID 0.26
OD 0.875
Thickness 0.003
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-37-003t

ID
OD
Thickness 0.003
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-38-005

ID 0.261
OD 0.75
Thickness 0.005
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-38-005t

ID
OD
Thickness 0.005
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-39-003

ID 0.265
OD 0.625
Thickness 0.003
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-39-003t

ID
OD
Thickness 0.003
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-40-002

ID 0.265
OD 0.843
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-40-002t

ID
OD
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-42-002

ID 0.321
OD 0.88
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-42-002t

ID
OD
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-43-002

ID 0.325
OD 0.812
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-43-002t

ID
OD
Thickness 0.002
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-44-062

ID 0.395
OD 1.0
Thickness 0.062
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-44-062t

ID
OD
Thickness 0.062
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-45-010

ID 0.5
OD 1.375
Thickness 0.01
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-45-010t

ID
OD
Thickness 0.01
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-46-062

ID 0.5
OD 1.5
Thickness 0.062
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-46-062t

ID
OD
Thickness 0.062
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-48-031

ID 0.796
OD 1.5
Thickness 0.031
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-48-031t

ID
OD
Thickness 0.031
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-49-030

ID 0.191
OD 0.755
Thickness 0.03
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-49-030t

ID
OD
Thickness 0.03
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-49-040

ID 0.25
OD 1.25
Thickness 0.04
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

750-49-040t

ID
OD
Thickness 0.04
Material Mica
ID TOL +-.005
OD TOL +-.005
Quantity

Mica Flat Washer Frequently Asked Questions

Below are answers to some of the most common questions about mica flat washers.

What are mica flat washers?
Mica flat washers are manufactured from natural or synthetic mica, a crystalline mineral with outstanding electrical insulation properties and exceptional thermal resistance. Mica washers are used in high-temperature electrical insulation applications including heating elements, power resistors, capacitors, and motor components where other insulating materials cannot withstand the operating conditions.

What temperature can mica washers withstand?
Mica is one of the most thermally stable electrical insulating materials available. Muscovite mica retains its insulating properties up to approximately 1000 degrees F (540 degrees C), and phlogopite mica is rated to approximately 1800 degrees F (980 degrees C). This makes mica washers suitable for applications that exceed the capability of plastics and most other non-metallic insulators.

What are the main applications for mica washers?
Mica washers are used as electrical insulators and heat shields in power resistors, ceramic heating elements, TO-3 and TO-220 transistor mounting, thyristors, industrial heating equipment, and other high-temperature electronic and electrical assemblies.

Can you make custom mica flat washers?
Yes. Superior Washer manufactures custom mica washers to your OD, ID, and thickness specifications. Contact us via the Quick Quote form or by phone to discuss your requirements.

Are your mica flat washers made in the USA?
Yes. All mica flat washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.

Mica is one of several high-temperature insulating materials in our catalog. See the complete flat washers lineup to compare all available options.