Bearing area under a washer
Bearing area under a washer
(OP)
When calculating the bearing area under a washer, I was taught to assume that the washer extends the diameter of the bearing surface past the diameter of the fastener head by twice the thickness of a washer (i.e. a 45 degree cone extending from the OD of the fastener head through the thickness of the washer). I was taught that this approach applies if the washer is 3/16 or less in thickness, but if it exceeds 3/16, you can assume that the OD of the washer is the OD of the bearing surface. Does anyone else use this method? Do you have a reference for this method (I can't find one)? Do you use a different method?
Thanks!
Andrew
Thanks!
Andrew





RE: Bearing area under a washer
RE: Bearing area under a washer
RE: Bearing area under a washer
RE: Bearing area under a washer
Thus, a thin washer will bend (a little bit) under the center load from the bolt, but that outside ring of the washer will deform the base metal very little. A thick washer will try to "cut" the ring that it touches of the base metal, and so there is no justification for the 45 degree cone of extra area.
RE: Bearing area under a washer
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JHG