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Load Indicating Washers.

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I'm sure this topic was discussed in the past, however, a search of the archives didn't find the answer.  I'll keep looking, it's possible that my search query on "washers" & "DTI washers" is wrong.
I need to clamp a bracket (to be used for a friction grip), and I need a washer/other that will indicate when I have reached the clamping force.
I have access to beveled (Belleville) washers that give a clamp force of 2373 lb (max P = 3078 lb).  I need 3400 lb.  Would  putting 2 washers of 1700 lb on one side give me the load I need.
Methinks that it doesn't add that simply?

Thor A Tandy P.Eng
Victoria BC
e-mail: vicpeng(--nospam--at)