I'm a fan of Carroll Smith's book "Nuts, Bolts, Fasteners, And
Plumbing Handbook". His beef with the SAE Grade 5, Grade 8 type hardware
is that they're hard and thus brittle. He recommends AN bolts which will
generally bend rather than snap when overloaded.
A 5/8" bolt is an AN10. It's available in a wide variety of grip
lengths. Grip length is the unthreaded portion under the head. Any
aircraft hardware store will stock them. They'll also have matching
washers and nylock nuts.
Page 59 in the book
(http://books.google.com/books?id=A81HmmRCN7YC&pg=PA59) shows the shear
strength of a AN10 bolt at 23,000 lbs in single shear and thus 46,000 lbs
in double shear.
The key is measuring the grip length you need, including any
washers you'll be using. You definitely do not want load on the threaded
portion, that's asking for trouble.
The previous page in the book has a chart with the grip lengths
available. The "dash" number indicates the length and is added after the
AN10 designation. For example, if you need a grip length of 2 1/16", then
you'd order an AN10-27A part number. The "A" after the dash number
indicates no hole in the head for safety wire. No "A" means it'll have a
safety wire hole.
Todd
Seattle,WA
'86 GTI, Red of course. (exciting racey car) 269,000 miles
'01 Golf TDI, silver. (new work car) 208,000 miles
'87 Golf, Polar Silver. (retired work car) 654,000 miles <- Gone to a new
home :(
http://www.pureluckdesign.com <-Ferrari & VW stuff
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