[TowerTalk] Tower Base Anchor Bolts

Gary J - N5BAA qltfnish at omniglobal.net
Sat Nov 9 21:22:16 EST 2013

They are easy to find on EBAY.  Just watch out which connector you need - 
Spline, SDS, SDS-Max.  They are not interchangeable.  Do a search for 
"rotary hammer drill".  I lend my drill and bits out to radio club members 
whenever needed.  It's so rocky here we use the drills to drill holes for 
T-posts and ground rods.

Gary J
HCARC Secretary 2013/14

-----Original Message----- 
From: Mike VE3YF
Sent: Saturday, November 9, 2013 1:37 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Tower Base Anchor Bolts


I have ran into a slight problem and need some help.

I am re-using my tower base for a new tower and the bolts that I
require are 1" x 27" and I have opted for the ASTM F1554 Grade 55, and
to leave 6" above the concrete which means 21" into the concrete.

However in my area all I can find for concrete bits that are 18" long
x 1.125" diameter.

However I can get a 22" bit x 1.250" Diameter

Is better to stay with an 18" x 1.125" hole and cut 3" off the bottom
of the bolt or go with a 22" x 1.250" hole and just add more epoxy.

Any help in this matter is greatly appreciated.


73 De Mike


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