Factory-direct steel gratings & stair treads, shipped worldwide
Technical Resources
Load tables by span and duty, weight tables, span charts and selection guides for steel grating — prepared for your project, shipped with your quote.
Itemized quote within 24 hours · Free drawing review included
The library at a glance
Every reference is prepared per project — there is no generic file to download, and no stale numbers.
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1
Load & span tables
By span and duty class — 19W4 style and custom equivalents
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2
Weight & dimension charts
kg per m² for your exact bar size, spacing and material
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3
Material & process guides
Q235B vs SS304 vs SS316 · welded vs press-locked close mesh
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4
Coating & fixing documents
ASTM A123 / ISO 1461 expectations · clip and fixing layouts
Quote within 24 hours
Itemized, free drawing review included
Certified & tested
Reports on request, MTC with every order
5-stage QC
From MTC verification to coating thickness checks
FOB Tianjin
Shipped worldwide, EXW / CIF negotiable
Load & span data
Load Tables & Span Charts, by Span and Duty
These references are prepared per project rather than published as a generic file. Request load tables with your quote and the relevant sheets ship with it — calculated for your spans, bar spacing and duty class, not for an average panel.
19W4 load table
Loads and clear spans for 19W4-style welded designations — bearing bars on 19/16 in (about 30 mm) centers, cross bars on 4 in (about 100 mm) centers — plus the metric equivalents we produce.
Ships with your quote
Span & deflection charts
Maximum span by bearing bar size and height, with deflection limits for pedestrian and light industrial duty. We mark the governing row for your panel before you order.
Ships with your quote
Duty-class load charts
Pedestrian walkway up to heavy-duty wheel traffic: which bearing bar sizes carry which duty at which span, produced to ANSI/NAAMM MBG 531 reference practice.
Ships with your quote
| Parameter | Production range the tables are built from |
|---|---|
| Bearing bar | 20×3 mm to 100×8 mm, plain or serrated |
| Bar spacing | 30 / 40 / 60 mm centers |
| Close mesh | Down to 11 / 11 mm, press-locked |
| Panel width | Up to 1.25 m |
| Panel length | Up to 6 m |
| Materials | Q235B carbon steel · SS304 / SS316 stainless |
| Surface | Black or hot-dip galvanized (ASTM A123 / ISO 1461) |
| Reference practice | ANSI/NAAMM MBG 531, produced to on our lines |
Working out the numbers yourself?
Our method notes walk through the same steps we use: converting your load case into a bearing bar size, checking deflection against the span, and reading a 19W4 designation against metric spacing.
- How to calculate grating load — step by step
- Bar grating load calculator — inputs and formulas
- Bearing bar options — what each size buys you
Or skip the arithmetic — send spans and loads, and we will mark the table rows for your case inside the 24-hour quote.
Weight & dimensions
Weight Tables & Standard Panel Dimensions
Panel weight follows from bar size, spacing and material — a 25×5 mm configuration and a 60×5 mm one differ by multiples, not percentages. That is why our weight tables are computed for the configuration you are quoting instead of published as one generic sheet.
Weight per m² tables
Unit weight in kg/m² for common bar sizes and spacings — the 25×5 unit-weight question answered for your exact mesh, in carbon or stainless, bare or galvanized.
Prepared on request
Standard sizes sheet
Stock panel dimensions against cut-to-drawing panels: width up to 1.25 m, length up to 6 m, banding and cutout options listed for each format.
Prepared on request
Galvanized weight charts
Hot-dip galvanizing adds zinc mass to every surface. Our charts show bare versus galvanized panel weight so your loading and freight plans stay honest.
Prepared on request
Weight feeds straight into your cost and container plan — ask for the weight tables with your quote and both arrive together.
Selection guides
Material Selection: Q235B vs SS304 vs SS316
The environment decides the grade — not the brochure. This is the comparison we send with every material question, with an honest note on when galvanized carbon steel is simply the better buy.
| Decision factor | Q235B carbon steel | SS304 stainless | SS316 stainless |
|---|---|---|---|
| Best for | Most industrial and outdoor duty | Food, washdown and general chemical areas | Marine, coastal and heavy chloride exposure |
| Corrosion strategy | Hot-dip galvanized to ASTM A123 / ISO 1461 | Inherent — no coating needed | Inherent, highest of the three grades |
| Typical finish | Black or hot-dip galvanized | Pickled or mill finish | Pickled or mill finish |
| Typical applications | Platforms, walkways, trench covers, stair treads | Food plant floors, clean areas, drainage | Docks, desalination and chemical platforms |
| Documentation | MTC to EN 10204 Type 3.1 per heat | MTC to EN 10204 Type 3.1 per heat | MTC to EN 10204 Type 3.1 per heat |
| Honest note | When the environment is dry or sheltered, galvanized Q235B is usually all you need | Paying for 316 without chlorides in play is money misdirected | Worth it exactly where chlorides or strong chemicals are present |
Welded construction
Electro-forged bearing and cross bars, 30 / 40 / 60 mm centers — the default for platforms, walkways and trench covers at any real span. Welded grating →
Press-locked close mesh
Cross bars pressed into notched bearing bars, down to 11 / 11 mm openings — heel-proof floors, trench covers and facades. Close-mesh grating →
Plain vs serrated surface
Serrated bearing bars bite when wet or oily; plain bars are easier to clean and quieter underfoot. Both available in every grade. Serrated options →
Coating & fixings
HDG Coating Expectations & Fixing Layout
What to expect from hot-dip galvanizing
- Coating produced to ASTM A123 / ISO 1461 — a metallurgical zinc bond, not paint that peels
- Thickness checked by sampling on every galvanized batch — stage four of our five-stage QC
- Appearance runs bright to matte gray with steel chemistry; vent and drain marks are normal
- Galvanizing cycle of 2–3 days runs inside your production window, not on top of it
Read more on the HDG grating page and the coating specification page, or compare market rules in the standards hub.
Fixing & clip layout guidance
Clips keep panels quiet, flat and secure — their count and positions follow panel span, traffic and support steel, so we do not publish one generic pattern. What you get instead:
- A fixing layout drawing issued with the installation drawings for every order
- Saddle clips and bolted assembly — no welding on site, no damage to the zinc layer
- Load direction marked on drawings so bearing bars sit across your supports
- Clips supplied as accessories to match your panel specification
Clip types and uses are covered on the clips & fixings page.
Factory-direct quote
Get a Factory Quote — and the Load Tables With It
One form, five fields. Send spans, loads and quantities, and mention which tables you need — the load tables, weight charts and fixing layout ship together with your itemized quote within 24 hours.
- Data prepared for your spans, bar spacing and duty class
- DoC, MTC EN 10204 3.1 and inspection report with every order
- Free drawing review — we flag span or clip issues before production
Prefer to talk? WhatsApp us or sales@dtsteelladder.com
Request load tables with your quote
Five fields — we do the rest.
FAQ
Frequently Asked Questions
How do I get the load tables and weight charts?
Ask in the quote form below — request load tables with your quote and they ship with it, prepared for your spans, bar spacing and duty class. There is no generic download: every table is built for the panel you are actually buying, so the numbers match your project.
Which material should I specify — Q235B, SS304 or SS316?
Q235B carbon steel with hot-dip galvanizing covers most outdoor and industrial floors. SS304 suits food and general washdown areas; SS316 is the choice for marine and heavy chloride exposure. Tell us the environment and we recommend the grade in your 24-hour quote — an MTC to EN 10204 Type 3.1 comes with every shipment.
Can you check spans, deflection and clip layout for my drawings?
Yes — send panel sizes, loads and quantities. Drawing review is free inside the 24-hour quote, and installation drawings with a fixing layout are included with the order. Samples ship in 5–7 working days and production runs 15–25 working days after drawing confirmation.
Related pages
Related Specification Pages
19W4 Steel Grating
Designations decoded: bar pitch, cross bar pitch and metric equivalents.
View page →Grating Load Table
How load tables are read — spans, duty classes and governing rows.
View page →Bearing Bar Grating
Bar sizes from 20×3 to 100×8 mm and what each size carries.
View page →Grating Panel Dimensions
Panel widths to 1.25 m and lengths to 6 m, stock vs cut-to-drawing.
View page →25×5 Grating Unit Weight
The most-requested weight question, answered per configuration.
View page →Bar Grating Load Calculator
Inputs, formulas and limits for checking loads yourself.
View page →All specification grating pages → · Standards hub → · Buying & technical FAQs →