what is a fender washer?

wrote in message
ups.com...
what is a fender washer? in which situation is it used?


Common name for a washer larger than an ordinary washer for the same
diameter bolt. It is used for special purposes and to spread the bearing
load, as on a wood or composite bearing surface.

Thus we use "fender washers" or "970's" on a composite bulkhead where we
are fastening a hydraulic accumulator or on a wooden bulkhead so as not to
crush the fibers.

Of course a "fender" washer may not be legal for aircraft use. Always use a
cad-plated AN 970 washer purchased from a reliable source.

groups trimmed