Base Plate A steel plate providing a flat bearing surface with a spigot or screwjack for
distributing the load from posts (standards). It has an integral spigot and fixing holes for
use with sills.
Bearer (Transom) A horizontal transverse scaffold member, that may support platform
units, and which is supported by at least two runners (ledgers) or connected directly to at
least two posts (standards)
Board Bearer (Intermediate Transom) A horizontal transverse scaffold tube upon which
the scaffold platform partially rests. Board bearers are supported by runners (ledgers)
and are not installed near a transverse line of posts (standards)
Body Belt (Safety Belt) A strap with means both for securing it about the waist and for
attaching it (with a lanyard) to a lifeline or anchorage. Used to provide personnel positioning
limits against a fall (i.e., keep wearer away from edge of a roof). Body belts shall not be
used as part of a personal fall arrest system.
Box Tie An assembly of tubes and couplers forming a frame around a column or other
part of a building to provide an anchor point for scaffold tie tubes. Also known as a column
box tie.
Brace A rigid connection of scaffold tubing that holds one scaffold member in a fixed
position with respect to another member to give the scaffold rigidity.
Cross Bracing Two diagonal braces joined at their center to form an “X.” Also
called “X” bracing or cross braces.
Diagonal Brace A scaffold tube placed diagonally with respect to the vertical
and horizontal members of a scaffold and fixed to them to give the scaffold
stability.
Longitudinal (Facade or Sway) Bracing Diagonal braces installed in the
plane of the longer dimension (length) of the scaffold.
Plan Bracing Diagonal braces installed in a horizontal plane, particularly used
in mobile and tower scaffolds.
Transverse (Sectional or Ledger) Bracing Diagonal braces installed in the
plane of the shorter dimension (width) of the scaffold.
Zig-Zag (Dog-leg) Bracing Diagonal braces placed end-to-end and that
alternate back and forth.
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