Located outside the USA?
Please read this important information on buyer responsibilities.


Maximum Torque Values

Ceramco has established (maximum) service torque values for customers whose application(s) may be dependent on specific torque or preload requirements

Read the data…

Solid Ceramic

Flat Washers - British  | → Metric | → U.S. Inch

stock ceramic flat washer - BritishBritish flat washers Our solid ceramic fasteners are production systems ISO 9001-2015 compliant and ideally suited for high temperature and corrosive environments, or where electrical conductivity is a concern.

A product of the United States. In-stock fasteners. Shipped to you immediately.

No Free Samples

*Available sizes, compositions and lengths vary and may be dependent upon material properties and performance characteristics. Please check our website for the most up-to-date information.

Metric flat washer dimensional reference

To order fasteners:find the correct size, then select the composition you require.

    A B C
Size Com­posi­tion Inside Diam­eter Outside Diam­eter Thickness
M2 alumina 2.20 - 2.35 4.70 - 5.00 0.20 - 0.40
M3 alumina 3.20 - 3.40 6.70 - 7.00 0.40 - 0.60
M4 alumina 4.30 - 4.50 8.70 - 9.00 0.70 - 0.90
M5 alumina 5.30 - 5.50 9.70 - 10.00 0.90 - 1.10
M6 alumina 6.40 - 6.70 12.10 - 12.50 1.40 - 1.80
M8 alumina 8.40 - 8.70 16.60 - 17.00 1.40 - 1.80

Dimensions Per BS 4320

Important Information -Please Read

Alumina & zirconia (PSZ) fasteners

  1. The pitch diameter of male threads will not exceed the max allowable according to Class 2. Minimum allowable pitch diameter may be below that of Class 2, conversely for female threads. Due to shrink factor variances, the stack up tolerance cannot be controlled on the pitch. It is recommended that you not engage more than 5 to 10 threads on any male fastener.
  2. No warranty with respect to torque strength and tensile strength is extended or implied. Ceramic materials are inherently brittle and display catastrophic failure if impacted or stressed beyond material limits.

Heat Resistant Corrosion Resistant Non-conductive Non Out-Gassing

Stock ceramic fasteners from Ceramco, Inc. Specializing in custom ceramic parts of complex geometries. Learn More.

Immediate Assistanceis only a phone call away. If you have any questions or require additional information, please call Ceramco at: +1 (603) 447-2090, Monday - Friday, 8:00 am - 4:30 pm, U.S. Eastern.