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McNICHOLS® Bar Grating

Press-Locked, Rectangular Bar, GCM-1-100 - CLOSE MESH, ADA, 7-P-4 Spacing, Carbon Steel, Hot Rolled, 1" x 3/16" Rectangular Bar, Smooth Surface, 55% Open Area
McNICHOLS® Bar Grating, Press-Locked, Rectangular Bar, GCM-1-100 - CLOSE MESH, ADA Compliant, 7-P-4 Spacing, Carbon Steel, Hot Rolled, Mill Finish, 1" Height x 3/16" Thick Rectangular Bearing Bars, Spaced 7/16" on Center with 1/4" Clear Space Between Bearing Bars, Smooth Surface, (ADA Compliant Product When Direction of Bearing Bars (Span) Installed Perpendicular to Dominant Direction of Travel), Bearing Bars Run Parallel to Length of Panel, Cross Bars Spaced 4" on Center, Cross Bars Tack Welded to Inside Edge of Outside Bearing Bars on Both Sides of Panel Length, 55% Open Area

ITEM 6601319999 - 36.063" x 144" In-Stock!

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Item Number 6601319999
Product Line Bar Grating
Construction Type Press-Locked
Bearing Bar Shape Rectangular Bar
Series Type & Name GCM-1-100 - CLOSE MESH (7-P-4) - ADA
Product Spacing 7-P-4
Primary Material Carbon Steel (CS)
Alloy, Grade or Type Hot Rolled (HR)
Material Finish Mill Finish
Bearing Bar Size & Shape 1" Height x 3/16" Thick Rectangular Bar
Bearing Bar Height 1"
Bearing Bar Thickness 3/16"
Bearing Bar Spacing 7/16" on Center
Clear Space Between Bearing Bars 1/4"
Product Surface Smooth
ADA Compliant ADA Compliant Product When Direction of Bearing Bars (Span) Installed Perpendicular to Dominant Direction of Travel
Bearing Bar Direction (Span) Parallel to Length of Panel
Cross Bar Size & Shape 1/8" Width x 7/8" Height Rectangular Bar
Cross Bar Spacing 4" on Center
Percent Open Area 55%
Weight 18.10 Lbs./Square Foot
Product Form Panel
Drawings CAD Drawing - PDF
CAD Drawing - DWG
Sizes (Width x Length)
36.063" x 144"
Load Table View


McNICHOLS® Bar Grating brings safety, strength, durability, and character when installed in either industrial or architectural applications. Common applications include catwalks, factory floors, platforms, railing infill panels, and Stair Treads. A series of bearing bars are welded, swaged and locked, or pressure-locked with perpendicular crossbars to form Grating panels. Bar Grating is a rugged, high-performance, low-maintenance, and slip-resistant product capable of handling pedestrian and vehicular loads.


The information provided below is your guide for choosing the right McNICHOLS® Bar Grating product for your project. Ordering information for McNICHOLS® Bar Grating Stair Treads is available by selecting the following link: Specifying & Ordering Bar Grating Stair Treads



Consider Bar Grating uses and physical requirements for your interior or exterior application. Loading, span, and support needs as well as traffic requirements such as pedestrian, hand cart, and vehicular are important considerations. Several Bar Grating products comply with the Americans with Disabilities Act (ADA) when installed to written standards. We invite you to browse Bar Grating applications in our Product and Application Gallery.


Construction Type

Choose from Welded, Heavy-Duty Welded, Swage-Locked, Press-Locked, or Clinched construction types.


Series Type & Name

Determine the series type and name (GW-100, GHB-150, GAL-125, etc.) of the Bar Grating product for your project. If applicable, items that comply with the Americans with Disabilities Act (ADA) standard will have this language indicated in the product's description and item specifications of the applicable product.


Product Spacing

Select the product spacing (the measurement from the center of one bearing bar to the center of an adjacent bearing bar) of the Bar Grating item. Product Spacing (e.g. 19-W-4) refers to the industry specification for Bar Grating products. For example, the first number refers to the bearing bar spacing measured on center (19 = 19/16" or 1-3/16"), the letter refers to the construction type (W = welded), and the last number references the cross bar spacing measured on center (4 = 4").


Primary Material / Product Finish

Select the primary material type including Aluminum, Carbon Steel, Carbon Steel - Painted Black, Galvanized Steel, or Stainless Steel. Inventory is typically "mill finish" for Aluminum, Carbon Steel and Stainless Steel. Hot-Dipped Galvanized, Painted Black, or Painted Gray finishes are available for some Carbon Steel items. We provide more information on Primary Material Types and Product Finishes in the links provided in the Overview section on the Bar Grating Resources landing page.


Bar Size & Shape

Choose the bearing bar height and thickness (e.g. 1-1/4" Height x 3/16" Thick) and the shape (Rectangular Bar, I-Bar or T-Bar).


Product Surface

Determine if your application requires a smooth, serrated, or grooved product surface.


Percent Open Area

Choose the percentage of open area desired in the panel or pieces of Bar Grating.



Choose the direction the bearing bars need to run to support the application load. Bearing bar direction is often referred to as span. Clear Span refers to the distance between Bar Grating supports. Bearing bar direction is an important installation consideration.


Product Size, Form & Quantity

Identify the number of panels (width and length) and/or sizes (cut-to-size pieces, areas, stair treads) and cut types (random, uniform, equal stub). Areas exceeding standard panel widths are provided in multiple pieces to width.


Special Requirements

Specify any requirements such as fabrication, banding, notching, cut-outs, toeboards, Stair Treads, non-standard tolerances, etc.



Determine if Bar Grating Accessories like Clips or Fasteners/Hardware, Carrier Plates, etc. are needed for your project or application.


Helpful McNICHOLS® Bar Grating load tables to save, print, or share!

Welded - Carbon Steel & Galvanized Steel