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Re: [TowerTalk] Epoxied bolts

To: "Pat Barthelow" <>, <>
Subject: Re: [TowerTalk] Epoxied bolts
From: "Orcena Lyle" <>
Date: Fri, 3 Feb 2006 16:41:29 -0600
List-post: <>
Did it pull wood with it?

  ----- Original Message ----- 
  From: Pat Barthelow 
  Sent: Friday, February 03, 2006 2:51 PM
  Subject: Re: [TowerTalk] Epoxied bolts

  My curiosity and the magic of internet search has found an informative site 
  showing results and techniques for testing of Imbedded bolt shafts in huge 
  wooden sail boats.  They show me that Epoxy, applied by experts, is 
  incredible stuff.  This app does not directly transfer to the strength of 
  the steel rod-epoxy-smooth hole interface in concrete, but is still an eye 
  opener to how strong properly engineered epoxy bonds are.

  They pull tested a 3/4" stainless bolt epoxied, centered,  into a 1" hole 
  for 3" depth into WOOD, and the Tinneus-Olsen puller ripped  it out at 13.9K 
  lbs.   Another test specimen, 9" deep in wood,  x 1.5" dia withstood 55K lbs 
  before failure.   They have good precise descriptions and photos on the test 
  setups which were required to be done  by Lloyds of London, the ship 

  For a good read, see:

  and find the section on Bonded in Fasteners.

  73, DX, de Pat Barthelow AA6EG


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