DEFINITIONS
VERTICAL LIFT: The lifting of a single
plate or member in which the lifting
force exerted by the rigging is directly
above and in line with the lifting shackle
as shown in the illustration below.
VERTICAL TURN/LIFT: A vertical turn/
lift clamp is a vertical lifting clamp spe-
cifically intended to turn a single plate or
member thru a ninety degree (90°) arc
and back to vertical thru the same
ninety degree (90°) arc or from horizon-
tal to vertical to horizontal thru a one
hundred and eighty degree (180°) arc.
Refer to Application Section of specific
Turn/Lift clamps for further detail. Dur-
ing the turning operation the edge of the
plate opposite the edge to which the
clamp is attached should always be in
contact with a supporting surface such
as a factory floor and the load on the
clamp not exceed one half rated capac-
ity of clamp—refer to illustrations shown
below.
HORIZONTAL LIFT: Clamps (used in
pairs or multiples) are attached to the
side edges of a plate or bundle of
plates positioned horizontally to the
floor level. The rigging attached to
clamps is generally multi-legged slings
with the connecting point of the slings
being approximately centered between
the distance separating the clamps.
Refer to illustrations shown below.
WARNING: The capacity of all hori-
zontal clamps is based on a sling
angle of sixty degrees (60°). See
illustration below. Sling angles less
than sixty degrees (60°) increase the
load exerted on the clamps, Never
exceed the rated capacity of a single
clamp.
STEEL PLATES: Unless otherwise
specified, lifting clamps are manufac-
tured to handle hot-rolled steel plates
whose Brinell Hardness does not ex-
ceed 300.
WARNING: Do not lift
plates with coatings or mill scale
that prevent the gripping surfaces of
the clamp from making positive con-
tact with the base metal.
For applications not covered by the
above information, secure written rec-
ommendations from RENFROE.
FINISHED AND POLISHED PLATES:
Steel plates in this category have other
than hot-rolled surfaces such as
stainless steel, etc., are generally han-
dled using non-marring clamps incor-
porating smooth gripping surfaces.
WARNING: For applications using
clamps with serrated gripping sur-
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