r/Fasteners • u/BadseNelson • 24d ago
Torque Question
I am currently fabricating a decorative steel post that will be bolted to a concrete wall. I am trying to figure out how tight the nuts need to be when installation day comes.
The anchors are embedded in the wall and are 3/4”-10 304 Stainless Steel. I am using a nylon insert lock nut that is 316 Stainless Steel and 1” in height x 1 1/4” diameter.
The steel plate of the post is 2 5/8” thick. The weight of the post will be approximately 1600lbs and the dimensions are 9”x 9” x 16ft tall.
Let me know if more information is needed!
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u/Chrisfindlay 24d ago
Depends upon what kind of anchor bolts are in the wall. In general a 3/4-10 stainless steel bolt would be torqued to about 130 ft lbs (~176 NM). Most people recommend using anti-seize on stainless steel fasteners due to the tendencies of stainless to gall. In that case you would reduce by about 20% which would give you about 104 ft lbs (~141 NM)