Steel Bar Grating

Reading the downloadable reference

Steel grating load-table scope and nominal panel widths

The downloadable Chinese reference is labeled YB/T 4001.1-2007, tables E1-E7, printed pages 26-32. The load symbols and nominal-width data are explained below as product-page text. This historical extract is a different source from the calculated screening tables linked on this website; their editions and assumptions must not be mixed.

Read the load case and deflection together

Match the table to the actual bearing-bar family

Confirm the exact model, material, bearing direction, clear span, support/bearing detail, load type, load area and deflection criterion in the project drawing. Do not transfer a flat-bar result to I-section grating, steel to FRP, or a metric pitch to a different imperial pattern. The original load matrices remain in the download; no additional capacity values are inferred here.

Nominal width by bearing-bar count – source table E7

All 93 bar-count records from E7 are set out below. The dimensional cross-check is nominal width = (bar count – 1) × bearing-bar pitch + bearing-bar thickness. Width is across the bearing bars, not the support span. Banding, installation clearance, edge details and manufacturing tolerances still follow the agreed drawing.

Dimensions are in mm. One inconsistent source field is marked “Confirm drawing” rather than silently corrected or presented as a verified dimension.

Source table E7: 20 mm bearing-bar pitch

Source table E7: 30 mm bearing-bar pitch

Source table E7: 40 mm bearing-bar pitch

11-W-4 project specification and inspection

Source: QY-SG-3PS-11W4-01, Rev. 1.0 / 24 Jul 2026, Section 05 53 00. This editable project reference covers light-duty carbon steel welded grating, bearing bars, cross bars, banding, anchors, clips and accessories. The original PDF download remains available.

Separate product basis: 11-W-4 has 11/16 in nominal bearing-bar centers. It is not 19-W-4, and this specification is not the historical YB/T load matrix or a capacity rating. Blank project fields below require an approved entry; the designation alone does not determine bearing-bar depth or load capacity.

Design inputs and reference editions

• State uniform load in psf or kPa and concentrated load in lb or kN, including its location.
• Record clear span and support width in inches or mm. State the service-deflection limit as the lesser of the specified L/divisor or absolute in/mm limit, unless project criteria differ.
• Select bar depth using evidence for the exact product, span, supports and loads. Do not combine unit systems or reference editions without review.
• Specify the slip-test method, surface condition and acceptance value. A slip claim needs an accepted report for that exact tested surface.

The PDF lists ANSI/NAAMM MBG 531-24; ASTM A1011/A1011M-25 for applicable bearing-bar input; ASTM A510/A510M-25 for applicable cross-bar input; ASTM A123/A123M-24 for specified after-fabrication galvanizing; and ASTM A153/A153M-23 for applicable hardware. These are the source document’s editions, not a claim that every listed standard applies to every item. The contract or authority-adopted edition and project structural, accessibility, slip, fire/life-safety and owner requirements govern.

Where an accessible route is required, review 2010 ADA Sections 302.1 and 302.3 and applicable exceptions: openings must not pass a sphere greater than 1/2 in (13 mm), and elongated openings have their long dimension perpendicular to dominant travel. This is a project check, not blanket ADA certification of a grating designation.

Product selections to put on the approved drawing

Submittals, material control and fabrication

• Submit exact designation, bar dimensions and spacing, cross bars, material, surface and finish; matching load tables/calculations; and drawings showing direction, supports, penetrations, cutouts, banding, joints, anchors and removable sections.
• Supply material, coating, fastener and dimensional records. Required slip or other tests must identify the exact product and test condition.
• Use approved carbon-steel grades and compatible banding, clips and fasteners. Keep heat/lot and component traceability, use qualified fabrication, and resolve drawing/specification conflicts before fabrication.
• Fabricate to the approved layout, bearing direction and tolerances. Detail cutouts, banding and permitted repairs; mark removable panels. Remove sharp projections without reducing required sections.
• Keep fabricated-product galvanizing and hardware requirements distinct. Use the applicable approved process and repair method, with coating-batch identity maintained.
• Specify attachment type, quantity and locations on the drawing; the source leaves the quantity open. Use captive or tamper-resistant details where required, not an assumed universal clip count.

Any substitution must match the technical, dimensional, load, finish and evidence package. Document material grades, and select clips/fasteners for the substrate, exposure and maintenance duty. Supply specified washers and support seats. Bearing bars span between supports; apply adopted ANSI/NAAMM and any tighter project tolerances, and match-mark adjacent panels where required. Compliance with load, slip, accessibility or coating requirements is not established by the product name alone.

Delivery and installation controls

Bundle and mark by area or panel ID. Store dry, ventilated and above ground; avoid wet, unventilated stacking, protect finished surfaces and edges and avoid distorting bundles. Verify support elevations, alignment and bearing before placing panels. Obtain approval before site cutting or alterations. Provide full, even bearing without loose shims, maintain approved openings and trip-edge control, and secure panels without crushing them. Record coating repairs and keep removable sections identifiable and restrained in service.

Installed-panel acceptance records

Clean and protect the installation and prevent construction overloading. Replace damage that cannot be restored by an approved method. Handover includes as-built drawings, material/coating records, accepted deviations, repairs and maintenance information, with the final evidence revision identified.