Factory-direct steel gratings & stair treads, shipped worldwide
11W4 Grating
Full 11w4 grating specs and size charts from the factory.
Itemized quote within 24 hours · Free drawing review included
Welded and press-locked lines
Close-pitch equivalents built in-house
Certified & tested
Reports on request, MTC with every order
Samples in 5–7 days
Production in 15–25 working days
FOB Tianjin
Shipped worldwide, EXW / CIF negotiable
Reading the designation
How to Read the 11W4 Grating Designation
11W4 is a NAAMM-style bar grating designation — three parts that tell you the bar depth class, the construction, and the cross-bar pitch before you ever see a drawing. Here is what each part means, and where 11W4 grating sits against its W-series neighbors such as 15W4 grating — often typed 15 w 4 grating — and the heavier 19W4.
11
Bearing-bar depth class
The leading digits place the bearing bar on the W-series depth scale. 11 sits at the light, shallow end — which is exactly why the pattern is specified where people walk, not where wheels roll.
W
Welded construction
The letter marks the joining method: bearing bars and cross bars fused at every intersection. We build the equivalent geometry on our electro-forging line; press-locked construction is the alternative when closer mesh is needed.
4
Cross bars at 4 in centers
The trailing number is the cross-bar spacing: 4 in, about 100 mm. On our metric production this pitch is built to order, quoted with the bar size and mesh that match your floor loading.
| Dimension | 11W4 | 15W4 | 19W4 |
|---|---|---|---|
| Position in the W-series | Light, close-pitch end | One step up in bar depth | The standard workhorse |
| Bearing-bar depth class | Shallow bars, fine footprint | Moderate depth | Deeper bars for longer spans |
| Cross-bar pitch | 4 in (about 100 mm) | 4 in (about 100 mm) | 4 in (about 100 mm) |
| Best duty | Pedestrian and public floors | Light-duty walkways and landings | Platforms, trench covers, wheel traffic |
| Opening behavior | Small openings, comfortable underfoot | Moderate open area | High open area, fast drainage |
| Our equivalent | Close-pitch welded or press-locked metric panels | Metric welded equivalents | Welded 19W4 and custom equivalents |
Need the bearing-bar side of the story — depths, thicknesses and bar counts? See 11W4 bar grating for the bar-spec view, or the spacing-first spelling on our W-19-4 grating page. Not sure which designation your floor needs? Send your drawings — we will spec it inside the 24-hour quote.
Construction options
11W4-Equivalent Panels from Our Own Lines
We do not run a US-gauge stock line — we build the equivalent geometry to order, in the metric sizes our workshop actually makes. Two constructions cover close-pitch duty:
1 · Electro-forged welded
Close-pitch welded panels on our electro-forging line: bearing bars from 20×3 mm, bar centers at 30 / 40 / 60 mm, every intersection pressure-forged in one pass. The direct route to W-series equivalents. See welded steel grating.
2 · Press-locked close mesh
When openings must stay small — school floors, retail thresholds, public concourses — our press-lock machine goes down to 11 / 11 mm mesh with no weld heat, so panels stay perfectly flat. See press-locked grating.
3 · Galvanized or plain finish
Indoor-floors or washdown duty decides the finish: black steel, or hot-dip galvanized to ASTM A123 / ISO 1461 referenced practice at our certified partner near the mill — already counted inside your production window. Close-mesh options on our close-mesh grating page.
Why specify 11W4
Why Buyers Specify 11W4 Grating for Pedestrian Floors
Full 11W4 specs, factory-direct
Specs and size data come from the mill that builds the panels, not a trading desk. Designation reading, mesh options and finish choices in one place — with load tables provided on request.
Close-pitch comfort underfoot
The 11W4 pattern exists for floors where small openings matter: shoes, casters and schoolbags stay on the surface. Our press-locked close mesh reaches 11 / 11 mm openings where the drawing calls for it.
Custom panels, small orders welcome
Custom 11W4 grating cut and banded to your drawings, with samples in 5–7 working days so you can check mesh and finish before committing to the run. Small trial orders are welcome.
Applications
Where 11W4-Style Panels Work
Close-pitch grating is specified wherever the public meets an open mesh floor — drainage still works, but nothing small drops through.
School & campus floors
Entrance mats, covered walkways and plant floors where small openings keep shoes and belongings on the surface.
Retail & public concourses
Mezzanine edges, service floors and thresholds in malls and stations — flat, galvanized, comfortable to cross.
Mezzanines & landings
Light pedestrian duty over plant rooms and storage — close mesh sheds dust and spills while staying walkable.
Sidewalk & trench covers
Public walkway covers with flush tops and heel-safe openings — see our sidewalk grating guide.
Specifications
11W4 Grating Specifications
| Parameter | Range |
|---|---|
| Bearing bar | 20×3 mm to 100×8 mm, plain or serrated |
| Bar spacing, welded line | 30 / 40 / 60 mm centers |
| Close mesh, press-locked | Down to 11 / 11 mm openings |
| Cross-bar pitch (11W4 pattern) | 4 in, about 100 mm, built to order |
| 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) |
| Load and weight tables | Provided with your quote — never guessed |
Materials & test documents
Every heat of Q235B, SS304 or SS316 enters production with its mill test certificate verified at goods-in — the first of our five QC stages. Panels leave with documentation, not promises:
- Mill test certificate to EN 10204 Type 3.1
- Factory inspection report with every shipment
- Declaration of Conformity prepared per order destination
Standards & compliance
Produced to Recognized Standards — Documents on Request
ANSI / NAAMM MBG 531
11W4-pattern panels produced to MBG 531 reference practice, with weld inspection on our five-stage QC plan.
ASTM A123 / ISO 1461 HDG
Galvanized coating thickness checked by sampling on every galvanized batch before panels are released.
CE & SGS tested
Certified & tested, reports on request — we show documents you can verify, not a certificate wall.
Custom made
Custom 11W4 Grating, Cut and Banded to Your Drawings
Send your drawing
Panel sizes, mesh, finish and quantities — or just a sketch marked up with the 11W4 reference. Drawing review is free.
Quote within 24 hours
Itemized, FOB Tianjin as standard — EXW or CIF on request. The exact designation-to-metric bar match is spelled out line by line.
Samples in 5–7 days, production in 15–25
Working days after drawing confirmation, hot-dip galvanizing included. Installation drawings and fixing layout ship with the order.
Factory-direct quote
Get an 11W4 Grating Quote
Send panel sizes and quantities — an itemized quote lands within 24 hours, free drawing review included.
- Five-stage QC, from MTC verification at goods-in to final inspection
- DoC, MTC EN 10204 3.1 and inspection report with every order
- Factory audits welcome — see the lines before you commit
Request the 11W4 grating sheet today — free from the factory, with the full size chart and load tables attached to your quote.
Prefer to talk? WhatsApp us or sales@dtsteelladder.com
Request your quote
Five fields — we do the rest.
FAQ
Frequently Asked Questions
What does 11W4 mean on a grating drawing?
11W4 is a NAAMM-style designation: the leading digits give the bearing-bar depth class, the letter W marks welded construction, and the 4 gives cross bars at 4 in (about 100 mm) centers. 11W4 sits at the light, close-pitch end of the W-series, next to 15W4 grating and below 19W4.
Can you supply 11W4 grating equivalents for public floors?
Yes. We build the equivalent geometry on our own lines: welded panels at 30 / 40 / 60 mm bar centers, or press-locked close mesh down to 11 / 11 mm where heel-safe openings matter. The exact bar depth and thickness match is confirmed in your itemized quote, with load tables provided on request.
What is the lead time for 11W4 grating panels?
Samples ship in 5–7 working days and mass production runs 15–25 working days after drawing confirmation, both including hot-dip galvanizing. Rush production in 10–15 days is possible with a surcharge — ask in your quote.
Related pages
Related Grating Pages
11W4 Bar Grating
The same designation from the bearing-bar side — bar depth, thickness and W-series data.
View page →19W4 Steel Grating
The heavier W-series designation for platforms, walkways and trench covers.
View page →W-19-4 Grating
The spacing-first spelling of the 19W4 designation, explained step by step.
View page →Grating Mesh
Mesh formats across the whole range — welded, press-locked and close mesh.
View page →Sidewalk Grating
Public walkway duty — flush tops, heel-safe framing, galvanized finish.
View page →Grating Panel Dimensions
Panel sizes, spans and how to lay out a floor to our production widths.
View page →