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 specifi-
cally 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 horizontal 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. During the turn-
ing operation the edge of the plate oppo-
site the edge to which the clamp is at-
tached should always be in contact with
a supporting surface such as a factory
floor and the load on the clamp not ex-
ceed one half rated capacity 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 gener-
ally multi-legged slings with the con-
necting point of the slings being ap-
proximately centered between the dis-
tance separating the clamps. Refer to
illustrations shown below.
WARNING:
The capacity of all horizontal 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 ca-
pacity 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 contact
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 incorpo-
rating smooth gripping surfaces.
WARNING: For applications using
clamps with serrated gripping sur-
faces on finished or polished plates,
secure written recommendations
from RENFROE.
