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McNICHOLS® Quality Grating - Riveted Products

Riveted Grating is one of the most substantial grating products available with high strength, flexibility and excellent lateral stability to handle moving vehicular loads. Riveted grating is constructed using high strength rivets to fasten the reticuline bars to the bearing bars.

Available in six styles, Riveted grating is made in either steel or aluminum. Our stock availability is reflected below, other styles are available by special order.

To place your order, please indicate your quantity in the stock list below.

· Aluminum Load Tables
· Plain Steel Load Tables
· Conversion Calculator

All Product Details

With the truss design, Riveted Grating is particularly suited to walking, working and wheeling in all directions. The depth of the reticuline bars and their tight riveted fit to the load bearing bars provide strong bearing bar stability. No heat is used to assemble riveted grating and the rivets are cold driven under hydraulic pressure. Hence, it is free from stresses that cause warp and joint failures.

Riveted Bar Grating

Riveted Series
McNICHOLS’ Riveted bar grating products are divided into five series: GM, GQ, GO, GR, & GWH. Each series has specific bearing and rivet spacing, bearing bar sizes, weights, load characteristics, fastener requirements, etc. Links to Riveted series information are provided below:

Riveted Series
All Riveted Series	Center to Center Bar Spacing Diagram/Characteristics Fasteners Construction & Spacing Table For All Bar Grating
GM	GQ	GO


Aluminum Load Table	Aluminum Load Table	Aluminum Load Table
Aluminum Weights	Aluminum Weights	Aluminum Weights
Plain Steel Load Table	Plain Steel Load Table	Plain Steel Load Table
Plain & Stainless Steel Weights	Plain & Stainless Steel Weights	Plain & Stainless Steel Weights
Cross-reference Table	Cross-reference Table	Cross-reference Table

GR	GWH


Aluminum Load Table	Aluminum Load Table
Aluminum Weights	Aluminum Weights
Plain Steel Load Table	Plain Steel Load Table
Plain & Stainless Steel Weights	Plain & Stainless Steel Weights
Cross-reference Table	Cross-reference Table

Material Selection -

Construction

With the truss design, Riveted Grating is particularly suited to walking, working and wheeling in all directions. The depth of the reticuline bars and their tight riveted fit to the load bearing bars provide strong bearing bar stability. No heat is used to assemble riveted grating and the rivets are cold driven under hydraulic pressure. Hence, it is free from stresses that cause warp and joint failures.

Riveted Bar Grating - Construction

Bearing Bar Height

The height is measured from the bottom of the bearing bar to the top. Bearing bar heights range from 3/4 inch to 5–3/8 inches.

Riveted Bar Grating - Bearing Bar Height

Bearing Bar Thickness

The bearing bar thickness, also known as bearing bar width, is the measurement of distance between the left surface of the bearing bar to the right surface of the same bearing bar. The standard rectangular bearing bar thickness for riveted grating is 3/16 inch. A 1/8, 1/4, 5/16, or 3/8 inch bearing bar thickness is available by special order.

Riveted Bar Grating - Bearing Bar Thickness

Center to Center Bearing Bar Spacing

Bearing bar spacing is the distance between the center of one bearing bar to the center of the next bearing bar.

Riveted Bar Grating - Center to Center Bearing Bar Spacing

C to C BB Spacing
Series	Spacing
GM	1-1/8 inches
GQ	3/4 inch
GO	1-1/8 inches
GR	3/4 inch
GWH	1-5/8 inches

Rivet Spacing

The rivet spacing is the measurement of distance between the center of one rivet to the center of the next rivet.

Riveted Bar Grating - Rivet Spacing

Rivet Spacing
Series	Spacing
GM	7 inches
GQ	7 inches
GO	3-1/2 inches
GR	3-1/2 inches
GWH	7 inches

Open Space

The open space is the clear spacing between the bearing bars. The open space is the difference between the bearing bar spacing and the bearing bar thickness. With a bearing bar thickness of 3/16 inch, the different series types have the open spacings shown to the right.

Riveted Bar Grating - Open Space

Rivet Open Space
Series	1/8 BB	3/16 BB
GM	1 inch	15/16 inch
GQ	5/8 inch	9/16 inch
GO	1 inch	15/16 inch
GR	5/8 inch	9/16 inch
GWH	1-1/2 inches	1-7/16 inches

Open Area

Open area is the combined area of the space between bearing bars and reticuline bars divided by the total area of the bar grating panel and is expressed as a percent. The larger the open area, the higher the percentage of light, air, or fluid that can pass through the grating.

Rivet Open Area
Series	1/8 BB	3/16 BB
GM	78.6 %	74.5 %
GQ	70.3 %	65.3 %
GO	77.2 %	73.1 %
GR	69.3 %	73.1 %
GWH	83.8 %	80.6 %

Span

The span of the grating is the length of the grating between grating supports. In order to perform in accordance with its design loading characteristics, grating must be installed so that the bearing bars are parallel to the span. This is necessary because bearing bars are the primary elements which support the load applied to the grating.

Riveted Bar Grating - Span

Clear Span

Clear span is the length of unsupported grating. Grating supports typically have a foot or ledge on which the grating rests. The part of the grating resting on the support is not part of the clear span. For example, if a 36-inch long piece of grating rests on two supports, each with a 3-inch ledge, the clear span would be 36 inches minus the part of the grating resting on the ledge (which is a total of 6 inches). In this example, the clear span would be 30 inches.

Riveted Bar Grating - Clear Span

Loading Information

When selecting a specific bar grating, it is important to know how much the grating will deflect (i.e. bend) under load. Deflection is determined by consulting a load table. Click for more information on load tables.

Types of load
Grating applications are subject to two common load types: Uniform and Concentrated.

Uniform Load
Uniform load is applied equally to the full width and span of the grating . It is measured in pounds per square foot.

Concentrated Load
Concentrated load is applied to the full width of the grating at mid-span and is not equally distributed across full length of the span. Concentrated load is measured in pounds per foot.

Grating in some applications may be subjected to a concentrated load over only a portion of its width. This is called a partial load. The deflection in a partial load is determined by the stiffness of both the bearing bars and the cross bars, and varies with the type of grating used. To determine carrying capacity of gratings subject to partial loads, click on live help, email us at internet.sales@mcnichols.com or call McNICHOLS (1-800-237-3820).

Traffic Type

If you don’t know the bearing bar height and thickness you require, the appropriate grating size can be determined from the load the grating is expected to carry. The following information is required.

What type of traffic will the grating support?
If only people are supported, specify pedestrian. If wheel traffic is to be supported, choose between “on-” or “off-road” vehicles. On-road vehicles include trucks, cars or any other vehicles that could be registered and licensed. If the vehicle would not typically be registered, a construction vehicle or forklift, for example, then specify “off-road.”

For Wheel Traffic Only
If the traffic includes off-road vehicles, then it is necessary to know:

· Weight or capacity of the vehicle in pounds
· Wheel diameter in inches
· Width of wheel in inches
· The tire type, either solid or pneumatic (air filled)

Surface

Welded bar grating is available with the following surfaces:

· Smooth - Standard surface.
· Serrated - Serrations are cut into the grating’s bearing bars surface
· Grip Tight^TM - Grit is bonded to the grating surface.

Grip Tight^TM surfaces provide slip resistance and are available by special order.

Riveted Bar Grating - Surface

Banding

Bar grating panels, pieces, or trench grating can be banded to provide strength and to provide a finished look. Banding is the welding of a rectangular metal bar to the ends of the bearing bars. Two banding types are available, based on the placement of the welds.

· Load Banding - The metal bar is welded at every bearing bar. Load banding is commonly used in trench grating applications where high loading requirements exist (i.e. motorized wheel traffic). Note: Aluminum products are not load banded.
· Trim Banding - The metal bar is welded only at every 4th to 6th bearing bar. Trim banding is commonly used for pedestrian traffic applications where loading is not a factor.

Riveted Bar Grating - Banding

Width

The standard panel width is 2 feet or 3 feet. Panels can also be cut-to-size. Cut-to-size widths are shown in the length/width table.

Riveted Bar Grating - Width

Length or Span

The standard panel lengths are 20 feet. Panels can also be cut-to-size.

Riveted Bar Grating - Length or Span

Quantity

Quantity is the number of bar grating pieces you will need. McNICHOLS will quote you on the exact quantity you specify and inform you if minimum quantities apply.

Tolerances

There are standard tolerances for shearing (cutting) heavy weld grating products. If you do not specify a tolerance, the standard tolerance applies. Tolerances can be specified on the quote form.

More information on tolerances.