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Here is a view of the two sizes of compression bolts to scale (5/16 on the left; 1/4 on the right) as they appear in the wall.  The difference in size is subtle but noticeable.
Fire Crag also sports dozens of 3/8" externally-threaded sleeve bolts. These bolts actually consist of a 5/16" bolt that is even thinner on the exposed, threaded end of the bolt. The possibility of shearing or pulling one of these bolts is real.
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3/8" externally-threaded sleeve bolt--one of two removed from atop the Rapture at Lower Gibraltar. This bolt is actually only 5/16" in diameter (even less on the threaded portion).  It has functionally little strength in our soft Central Coast sandstone.
Id# 105839591, 467 x 700px View full size
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3/8" externally-threaded sleeve bolt--one of two removed from atop the Rapture at Lower Gibraltar. This bolt is actually only 5/16" in diameter (even less on the threaded portion). It has functionally little strength in our soft Central Coast sandstone.

Submitted By: Matthew Fienup on Jul 7, 2006
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