Aluminum Rectangular Bar Grating SG Series
Catalog Code: 05 53 00/OHI
Sweets BuyLine Number: 2191
1. SG Plain Surface
2. SG Serrated Surface
3. SG Close Mesh
The most widely used aluminum pressure locked grating is the Rectangular Bar SG Series. The square cross bars are assembled through punched diamond shaped holes in rectangular bearing bars, and are permanently locked in place by swaging. Bearing bar sizes range from 1" x 1/8" through 2-1/2" x 3/16" in 1/4" increments. Bearing bar spacings include 1-3/16", 15/16", 11/16", and 7/16" c.c. Cross bar spacings of 4" and 2" are available. A serrated surface can be specified for areas requiring slip resistance due to the presence of moisture. For those areas that receive a great deal of pedestrian traffic, close mesh grating 7SG4 or 7SG2 provides a 1/4" opening, while allowing 50% open area. 7SG and 11SG grating conforms with the spacing requirements of the Americans With Disabilities Act when installed with the elongated opening perpendicular to the dominant direction of travel.
Standard Grating Details
Typical details for grating frames and grating anchorage methods are shown in the CAD details attached to this profile, accessible through the "CAD" button on the interface.
General recommendations for installation include:
1. All gratings should be anchored to their supports by positive means. See the "Grating Anchorage Details" section below.
2. A minimum of 1" bearing shall be provided.
Extruded Aluminum Grating Frames
Available for use with all types of aluminum grating is an extruded frame for embedded concrete applications. This frame features a continuous ledge to accommodate plank fasteners, grating clamps, or self-tapping screws for saddle clips or anchor blocks. This ledge allows the grating to be fastened to the frame without the necessity of pre-drilling into the concrete. The extruded design also incorporates a labor saving continuous anchor. The continuous anchor can be used alone, or in conjunction with supplementary anchor straps.
Angle frame is available fabricated per drawings with mitred corners, or in long lengths with prefabricated corners for installation in the field. Frames can be provided in the mill finished condition or with a coat of bituminous paint on surfaces which will come into contact with concrete.
Grating Anchorage Details
All gratings should be firmly anchored to their supports by positive means. The method of anchorage depends on the circumstances of the application in question. Refer to the CAD details attached to this profile, accessible through the "CAD" button on the interface for isometric details of the following anchorage devices for use with the SG Series:
A saddle clip is a special bent clip fastener available in aluminum, stainless steel and galvanized steel. Saddle clips are the most common anchoring devices used to hold bar grating in place. Saddle clips are generally used in conjunction with self-drilling, self-tapping stainless steel TEK screws, or with a bolt, nut and washer set. (Note: Cross bars may need to be snipped in the field to facilitate placement of saddle clips.)
A grating clamp is a special friction fastener available in aluminum, stainless steel, and galvanized steel. This type of fastener is used to anchor bar grating without penetrating the support with a TEK screw or bolt. Grating clamps are often used in conjunction with the Ohio Gratings extruded embedded grating frame. (Note: Cross bars may need to be snipped in the field to facilitate placement of grating clamps.)
Anchor blocks of 1/4" or 3/8" thick aluminum may be shop welded by the grating manufacturer and used to fasten permanent or removable bar grating panels. Anchor blocks are recessed thus offering a trip-free surface.
For close-mesh aluminum grating (7/16" bearing bar centers), a countersunk land may be drilled by the grating manufacturer for use with a 1/4" diameter TEK screw. This arrangement provides a trip-free surface since the head of the TEK screw sits flush with the grating surface.
The most versatile clip anchor available is the Z clip. These clips are especially helpful for holding down riveted grating. Z clips are manufactured from stainless steel and are available in 1" (for use with 1" and 1-1/4" grating), 1-1/2" (for use with 1-1/2" and 1-3/4" grating) and 2" (for use with 2", 2-1/4" and 2-1/2" grating). Z clips come with a pre-punched hole to accept a 1/4" bolt or TEK screw.
Frame sections can be purchased in stock lengths for customer fabrication, or can be fabricated by Ohio Gratings for immediate installation in the field. The following guidelines apply to fabricated frames:
1. All corners are mitred at 45 degrees and welded on the back side. Welds are not ground.
2. Nominal small frames (i.e., 1'-0" x 1'-0" through 5'-0" x 10'-0") are made in one piece.
3. Extended trench frames are provided with prefabricated end sections and long lengths shipped loose for field butt joining.
4. Stock lengths are 20'-0". Longer lengths are available by request.
Architectural Applications and Tolerances
"Aluminum grating is an industrial footwalk product, intended for use in catwalks, platforms, and stairways, and designed to be installed in a fastened condition. This grating is also subject to manufacturing and fabrication tolerances as dictated by the NAAMM Metal Bar Manual. While these tolerances and the various finishes available are suitable for most industrial applications, they may not be appropriate for some commercial or architectural uses. Please contact the factory for further specification assistance."
SLIP-NOT Safety Surface Available
Rectangular Bar SG Series grating is available with SLIP-NOT Grip Grate safety surface for maximum traction. The SLIP-NOT process provides for the plasma stream deposition of aluminum on aluminum resulting in a random hatch matrix which continuously presents new abrasive faces as the surface slowly wears.
SLIP-NOT exceeds OSHA standards for "Slip Resistance" in dry, wet, and oily conditions.
SLIP-NOT is generally applied after grating fabrication, however, grating treated with
SLIP-NOT can be cut, punched, drilled, or welded in the shop or in the field.
For complete technical information on SLIP-NOT, refer to the Sweets catalog for W.S. Molnar Co., 05542/SLI. SLIP-NOT Grip Grate is a registered trademark of W.S. Molnar Co.
For Guide Specifications which follow the CSI Three-Part Section Format, see our "Aluminum Grating Specifications" accessed through the "3-Part Spec" button on the interface.
Specifying Rectangular Bar SG Series Grating: insert the following under PART 2 - PRODUCT:
2.4 Grating Type
A. Grating to be Aluminum Rectangular Bar SG Series by Ohio Gratings, Inc. or approved equal.
B. Bearing Bars: Rectangular Bar on 1-3/16" centers maximum. (Note: Other spacings may be specified at the discretion of the architect/engineer.)
C. Cross Bars: Locked at right angles to bearing bars at a maximum of 4" on center. (Note: 2" cross bar centers may be specified at the discretion of the architect/engineer.)
D. Surface: Plain. (Note: A serrated surface may be specified for maximum skid resistance.) For those projects requiring embedded grating frames and/or stair treads, refer to "Grating Frames & Standard Details" and "Aluminum Stair Treads" Snapshots.
Specifying Embedded Extruded Aluminum Grating Frames: insert the following under PART 2 - PRODUCT:
2.5 Embedded Grating Frames
A. Grating frames to be of extruded design, alloy 6063-T6, by Ohio Gratings, Inc., or approved equal.
B. Frames shall have mitered corners and welded joints and shall be sized to match grating depth. Welds are not ground.
C. Vertical and horizontal legs of frame shape shall have 1/4" wall thickness. Frame shall be designed to provide a continuous slot to accommodate fasteners, and shall have a continuous extruded anchor. (Note: Additional anchor straps may be specified at the discretion of the architect/engineer.)
D. Surfaces coming into contact with concrete shall be painted with one coat of bituminous paint.
If you have questions about correctly selecting and specifying any Ohio Gratings, Inc. product for your project, call: (800) 321-9800.
Ohio Gratings, Inc.
5299 Southway S.W
Canton, OH 44706
Tel: (330) 477-6707
Fax: (330) 477-7872
Tollfree: (800) 321-9800
Web site: http://www.ohiogratings.com