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What is a T-nut and how does it work?
How do you fasten ‘Bolt-on’ climbing holds to wood climbing walls?
This guide is intended to be a quick explanation for customers who
have never built a climbing wall before.
Prior to fastening bolt-on style rock climbing holds to wood climbing walls, t-nuts must be installed in the back of the climbing wall. The bolt will go through the rock climbing hold, through the wood, and into the t-nut. A t-nut is basically a nut with a flange on one side. If you need help installing t-nuts check out our installation instructions here:
How to Install T-nuts
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Normally the outer diameter of a 3/8" t-nut is 7/16". The barrel of the t-nut can fit into a
7/16” hole, but the flange is 1” wide so it cannot fit through
the hole. The flange catches the
back of the climbing wall surrounding
the 7/16” hole. The prongs which have penetrated the wood will help keep the t-nut from spinning.
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When fastened properly, the Barrel of the T-nut should be
recessed behind the front surface
of the climbing wall by at least 1/
4”.
Climbing holds must not make direct
contact with the t-nut. If the hold makes direct contact
with the t-nut it will eliminate
the friction between the surface of
the climbing wall and the back of
the climbing hold. Climbing holds
must have good contact with the
climbing wall in order to be secure.
(For the photo on the bottom right, we used a bolt that was too long to illustrate the path of the bolt. When a proper length bolt is used, the end of it will be flush with the back of the t-nut.)
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