[Healeys] 100 Generator Witworth bolt

[warthodson at aol.com]

After our recent discussion about the 5/16" BSW (Witworth) bolt that threads into the aluminum end plate on the generator, I decided to search thru all my ziplock bags of British bolts to see if I could locate that one bolt. My 100 shipped disassembled. First, I separated all the 5/16" X 18tpi (coarse) bolts from the rest. Then I separated all the bolts with heads that fit a 1/2" socket because I understood that the 5/16" BSW bolts have a larger head. I was left with 2 bolts. They are identical, except that one is about 1/2" long & the other is about 7/8" long. Neither has any markings on the head of the bolt. My questions are:
If one is for the generator, where does the other one go?
The hex head on both bolts fit a King Dick socket marked 1/4W. The hex head measures 0.52 across the flats. According the a "Key to Nut & Bolt Sizes" chart I have, this head size should be on a 1/4"W bolt but the bolt is 5/16" diameter X 18TPI. Do you see the contradiction? Also, this chart indicates the hex head should measure 0.60 across the flats for a 5/16" BSW bolt. 
Gary Hodson   
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