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Suspension of Light Fixture

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To All,
 
I am designing the overhead support of a surgical light in an existing hospital, (California OSHPD). For vertical loads I would like to use a HSS vertical attached to a pair of horizontal angles. Loads are light and I would like to use 1- 5/8" diam. thru-bolt thru the HSS and "L" each side, but I somehow remember that someplace, (AISC?), you cannot use a one machine bolt connection. Any adivce as to whether this is true?
 
Thanks in Advance,
 
Larry Hauer S.E.


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