Steel Bar GratingSteel bar grating is manufactured from ASTM A-1011
mild carbon steel and is available in three distinct products: type
" W" welded bar grating, type " DT" dovetail pressure locked
grating, and type " SL" swage locked grating. All three products
are available with bearing bar spacing ranging from 19/16"
(1-3/16") to 7/16" on center and cross bars at either 4" or 2" on
center. Each product has a standard plain surface or may
be specified with optional serrated or Algrip surfaces. Finish
options include bare steel, painted, hot dip galvanized, or
specialty coatings. The steel bar grating load tables provide
detailed specification information related to these
products. Type "W" Welded Steel GratingOur most economical
steel grating products, type "W" welded steel gratings are
manufactured by forge welding rectangular bearing bars and drawn
cross bars. This welding process provides a positive fused
connection providing years of service under the most demanding
conditions. Type 19-W-4 steel grating is our most popular product
and is recommended for nearly all industrial flooring
applications. With nearly 80% open area, 19-W-4 allows for the
easy passage of dirt, debris, snow, and liquids and is essentially
self-cleaning. Type "W" gratings are available in close mesh, ADA
conforming spacings 11-W-4 and 7-W-4 which are commonly used in
public areas. When specifying type 11-W-4 for ADA applications,
3/16" thick bearing bars must be specified. Type "DT" Dovetail
Pressure Locked Steel Grating Type "DT" steel gratings have
deep rectangular cross bars and are manufactured by inserting
pre-punched bearing bars and cross bars into an "egg-crate"
configuration and deforming the cross bars under intense hydraulic
pressure. The deep cross bars on type "DT" gratings make them
popular for architectural applications such as sun shades and
infill panels with the deeper cross bar serving as a distinct
architectural accent. Type "SL" Swage LockedSteel GratingType
"SL" steel gratings are manufactured by inserting hollow tube cross
bars into pre-punched holes in the bearing bars. The cross bars are
then swaged forming a positive mechanical connection. The
cross bars are recessed below the top surface of the bearing bars
providing a uniform and attractive architectural
appearance. Swage locking is a particularly efficient
process for the production of close mesh gratings. Type 7-SL-4 with
3/16" thick bearing bars provides a net 1/4" clear opening
between the bearing bars. This narrow opening is often preferred in
public areas where concerns of drainage and the presence of high
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