11: CARSTONE STEEL COMPOSITION
Carstone certifies all steel used in
the structure of its chairs to conform
to ASTM A-513 grade C-1010 steel. This
is a significantly stronger and higher
quality steel than that used by our
competitors. We don’t need to make up
for lesser steel by using a heavier
gage and heavier weight.
(An example of
poor steel is shown. This competitor’s
chair leg was broken by bare hands,
CARSTONE STEEL SIZE
Our 1” square steel tubing equals a full
33% greater wall support. Our 13/16” square
steel tubing equals 8.5% greater wall
steel size is typically 3/4” square steel
Carstone welds on both the top and bottom
of the leg to back loop bars. This prevents
the joint from becoming a hinge point
under stress. In addition, we have extra
welds on the seat bar/back loop/leg junction.
joint can flex and open under stress.
There are no top welds to lock the frame.
Our welds are highlighted.)