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This detail reveals the significant corrosion of a 25 year old 3/8" stud bolt removed from San Ysidro.  Notice that a significant amount of mass has been eliminated from the part of the bolt that actually expands.
Here is another shot of the failed 1/2" expansion bolt from San Ysidro.  Notice that the expansion clip is missing from the cone at the bottom of the bolt--the expansion clip is still inside the rock where the bolt was originally placed.
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Here is the aforementioned 5/16" compression bolt removed from atop the Nose. It is pictured here alongside a brand new 12mm Fixe Triplex expansion bolt. (A 12mm bolt is only slightly larger than 3/8". The Triplex is actually a 3/8" bolt with a stainless steel sleeve.) <br /> <br />
Id# 105818693, 600 x 600px View full size
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Here is the aforementioned 5/16" compression bolt removed from atop the Nose. It is pictured here alongside a brand new 12mm Fixe Triplex expansion bolt. (A 12mm bolt is only slightly larger than 3/8". The Triplex is actually a 3/8" bolt with a stainless steel sleeve.)

Submitted By: Matthew Fienup on Apr 24, 2006
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