[TenTec] rohn 25

[Dr. Gerald N. Johnson, electrical engineer]

The original bolts for Rohn 25 according to the NEW sections I have
bought (and I bet it says so in my old Rohn catalog) are 1/4" and 5/16"
bolt diameter with 7/16" and 1/2" heads. Bolts 3/8 and 7/16" diameter
are way larger as if the holes were worn egg shaped from not being
properly tightened and then were drilled out until they are round again.
Now there's a lot less metal in the tower legs, but more bearing area on
the bolts. Probably overall its weaker.

The bolt holes are supposed to be a snug fit on the bolts. Rohn allows
using a tapered punch to align them and to remove excess zinc but
specifically says to never drill them.

73, Jerry, K0CQ

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Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.