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RE: Leveling Nuts

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You can use an FEA program and spend a couple of thousand dollars, or you can use the old rule of thumb.

The Rule of Thumb for plate washer thickness for:
36 ksi anchor rod material 1/3 x bolt diameter.
55 ksi anchor rod material 0.4 x bolt diameter
105 ksi anchor rod material 0.7 x bolt diameter.

I can not remember the source of this rule of thumb.

Harold Sprague

From: "James Getaz" <jamesgetaz3(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: RE: Leveling Nuts
Date: Sat, 17 Sep 2005 09:03:01 -0400

Harold, you say "a properly designed plate washer should make that issue moot." Please help me with a reference or procedure for properly designing a plate washer. Our design criterion has been to feel sure that the nut cannot pull through the washer. While this has worked, it is not easily defended if it failed.
  Thank you.
  Jim Getaz
  Winchester, Virginia

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