Member postings for Martin Morrison

Here is a list of all the postings Martin Morrison has made in our forums. Click on a thread name to jump to the thread.

Thread: What use is a washer

27/12/2011 08:25:41

Folks,

This was a question that I commonly asked when I was serving my time as a marine engineer,the journeymen told me several answers and all seem very sensible when explained.

One reason as mentioned above was to spread the load of the bolt on the clamped surface. Another reason is that many people use an oversised drill when boring the clearance hole, in this case the raised shoulder under the bolt head was either in the hole or partially over the hole, this caused the sharp edges of the nut to bite the material, when this happens in an application with higher vibration i.e. engines, aircraft's the sharp edge will cause the metal to crack, the washer with the round edge eliminated the chance of cracking, just like a circular saw blade with several slots in it and a bored hole inward of the slot.

Martin.

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