[TowerTalk] rohn 45 leg bolts

[mahlonhaunschild at cox.net]

The original Rohn joint bolts were Grade 5, galvanized.  That's not something that Lowe's or Home Depot stocks, at least in my experience.  They only carry Grade 3 galvanized.  Ace will have Grad e5 and Grade 8 hardware, but it's unlikely that it will be galvanized.

The last time I bought genuine Rohn joint bolt kits from Texas Towers (ten years ago, admittedly) they weren't galvanized, adn they were NF thread.  Don't know why the change.

I would suggest Grade 8 hardware.  Somewhat more corrosion resistant than the lesser grades.

Main thing about the length is that the bolt must be just the right length so that all of the vertical tower load is borne on the non-threaded portion of the bolt (e.g. no threads bearing on the insides of the bolt holes) but you still need to be able to tighten the nut, so make sure you get the right length.

Remember:  do NOT use a hammer to drive the bolts into or out of the tower legs; that will remove the galvanizing from the insides of the bolt holes, making them susceptible to corrosion.

NC = National Coarse; NF = National Fine.

regards,

Mahlon - K4OQ
> 
> From: "Julio Peralta" <jperalta at tampabay.rr.com>
> Date: 2004/02/05 Thu PM 01:03:18 EST
> To: <TOWERTALK at contesting.com>
> Subject: [TowerTalk] rohn 45 leg bolts
> 
> The Tampa Amateur Radio Club is getting ready to erect a R-45 tower. We need 8 sets of leg bolts. Rohn specs call for 3 each, 5/16" X  2 3/8" NC bolts and 3 each, 7/16 X 2 1/4" NC bolts per section.
> 
> Does any one have any spares on hand?
> 
> What does the NC in the spec stand for?
> 
> I would guess that any commercial fastener vendor would have suitable bolts.
> 
> BTW we also need a rotor shelf for the R-45 to complete the install.
> 
> Julio, W4HY
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>