Factory-direct steel gratings & stair treads, shipped worldwide
11W4 Bar Grating
11W4 and 19W4 bar grating models, welded and cut to size.
Itemized quote within 24 hours · Free drawing review included
Welded & press-locked lines
11W4/19W4 equivalents produced to your spec
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
Designation decoded
11W4 vs 19W4 vs Metric G-Series — Reading the Codes
US-style bar grating designations compress three decisions into one code: how close the bearing bars stand, how the panel is joined, and how far apart the cross rods run. Here is what each code means — and how it maps onto the metric builds our mill actually produces.
| How it reads | 11W4 | 19W4 | Metric G-series |
|---|---|---|---|
| First number | Bearing bar pitch in 1/16 in steps — 11 means 11/16 in, about 17.5 mm centers | 19 means 19/16 in, about 30 mm centers | Stated directly in mm, e.g. a 30 mm pitch |
| Letter | W = welded at every bearing bar / cross rod intersection | W = welded, same electro-forged joint | Set by the drawing — welded or press-locked |
| Last number | Cross-rod pitch in inches — 4 in, about 100 mm centers | 4 in, about 100 mm centers | Third field in mm, 100 mm typical |
| Duty it suits | Close-pitch pedestrian duty — foot traffic, heels, small debris | General platform and walkway duty | Whatever pitch and depth you specify |
| Our mill match | Quoted as a custom-pitch welded build; press-locked close mesh down to 11/11 mm is the nearest standard close build | Direct match — our welded 30 mm pitch is the 19W4 equivalent | Built to drawing from the same lines |
| Real range behind it | Bearing bars 20×3 to 100×8 mm, panels up to 1.25 m × 6 m | Same range, same panel limits | Same range, same panel limits |
Buyers who search a 19 4 grating or a 19 4 bar grating are almost always describing the same 19W4 panel — the letter W simply got dropped between the numbers. This page decodes the designation itself: pitch numbers, process letter and the duty they imply. If your question is instead how these panels frame into walkways and platforms, that grating-level view lives on the 11W4 grating page; the full welded model family starts at bar grating.
Not sure how your drawing reads? Send your drawings — we'll spec it inside the 24-hour quote.
Anatomy of the code
How to Read a US Bar Grating Designation
1 · First number — bar pitch
Counted in sixteenths of an inch. 11 reads as 11/16 in, about 17.5 mm center-to-center — a deliberately close stance, which is why 11W4-pattern panels land on pedestrian floors rather than wheel loads.
2 · The letter — how it is joined
W stands for welded: every bearing bar / cross rod crossing is resistance-forged in one pass on our electro-forging line, so nothing can work loose under foot traffic.
3 · Last number — cross-rod pitch
Read in whole inches: 4 in, about 100 mm centers. The rods carry no load in the span direction — they lock bar spacing and give the panel its transverse stiffness.
Why ask for 11W4 by name
Why Buyers Specify 11W4 and 19W4 Bar Grating Models
Specs decoded, not guessed
Free 11W4/19W4 grating help from the mill: send the code from your drawing and we translate it into a metric build — pitch, rod centers, bar depth and thickness — before quoting.
Custom pitch, any quantity
Custom 11W4 bar grating means a custom-pitch welded panel — cut and banded to your drawings, in any quantity. Small trial orders are welcome before you commit to a full program.
A123 galvanized, samples in 5–7 days
11W4 grating with ASTM A123 / ISO 1461 hot-dip galvanizing for exterior and wash-down exposure — samples ship in 5–7 working days with the coating already on.
Applications
Where 11W4-Pattern Close Pitch Earns Its Keep
A close bearing bar pitch costs more steel per square metre, so it is worth specifying only where feet — not wheels — are the load. These are the positions where 11W4-pattern panels are the right call.
Pedestrian platforms
Close pitch under steady foot traffic — access platforms and plant floors where people stand and walk all shift.
Mezzanine & catwalk floors
Comfortable underfoot on elevated walkways; small openings that shed debris while feeling like a solid floor.
Pedestrian trench covers
Walk-over drainage in yards and around process floors — close bars keep heels out of the channel.
Stair treads
Close-pitch treads for escape and access stairs — plain or serrated top, banded ends and a nosing to your drawing.
Specifications
11W4 / 19W4 Specification Ranges at Our Mill
| Parameter | Range |
|---|---|
| Bearing bar | 20×3 mm to 100×8 mm, plain or serrated |
| Standard welded pitch | 30 / 40 / 60 mm centers — 30 mm is the direct 19W4 equivalent |
| 11W4-pattern pitch | 11/16 in ≈ 17.5 mm — quoted as a custom-pitch welded build |
| Close-mesh option | Press-locked down to 11/11 mm, the nearest standard close build |
| Cross-rod pitch | 4 in ≈ 100 mm typical, set to your drawing |
| Panel width / length | Up to 1.25 m wide, up to 6 m long |
| Materials | Q235B carbon steel · SS304 / SS316 stainless |
| Surface | Black or hot-dip galvanized (ASTM A123 / ISO 1461) |
Materials, tables & documents
Designation codes fix the pitch, not the load — that depends on bar depth, thickness and span. Load and deflection tables for each pitch and depth are provided with your quote rather than guessed at here. What you can count on:
- 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
Designation-equivalent welded panels produced to MBG 531 reference practice, with weld checks on our five-stage QC plan.
ASTM A123 / ISO 1461 HDG
Galvanized coating thickness checked by sampling on every galvanized batch before designation-equivalent panels are released.
CE & SGS tested
Certified & tested, reports on request — we show documents you can verify, not a certificate wall.
Custom made
Designation-Equivalent Panels, Cut and Banded to Your Drawings
Send the code or the drawing
An 11W4 or 19W4 call-out, a G-series spec, or a full panel drawing — plus spans and loads. Drawing review is free.
Metric build confirmed within 24 hours
We reply with the decoded pitch, bar size and rod centers as an itemized quote — FOB Tianjin as standard, EXW or CIF on request.
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 a Factory Quote
Ask for the 11W4/19W4 spec sheet — send the code and your spans, and an itemized quote lands within 24 hours with the metric build spelled out.
- 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
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 bar grating drawing?
In the US designation convention the first number gives the bearing bar pitch in sixteenths of an inch, the letter gives the process (W = welded), and the last number gives the cross-rod pitch in inches. So 11W4 is a welded panel with bearing bars about 11/16 in (roughly 17.5 mm) apart and cross rods on 4 in (about 100 mm) centers — a close pitch intended for pedestrian duty.
Do you manufacture 11W4 bar grating at your mill?
We are a metric-spec mill, so we quote 11W4 and 19W4 as designation equivalents produced to your spec. The 19/16 in pitch of 19W4 maps directly onto our 30 mm welded pitch; the closer 11/16 in pitch is quoted as a custom-pitch welded build, with press-locked close mesh down to 11/11 mm available as the nearest standard close option.
What are the lead times and documents for an order?
An itemized quote lands within 24 hours, samples ship in 5–7 working days and mass production runs 15–25 working days after drawing confirmation. Every order leaves with an MTC to EN 10204 Type 3.1, a factory inspection report and a Declaration of Conformity — certified and tested, reports on request.
Related pages
Related Specification Pages
11W4 Grating
The grating-level view — how 11W4-pattern panels frame into floors.
View page →19W4 Steel Grating
The wider-pitch sibling designation, mapped to our 30 mm build.
View page →W 19 4 Grating
The spaced-out spelling of the same 19W4 code, explained.
View page →19W4 Load Table
How to check loads for a designation panel — method and spans.
View page →Bar Grating
The full welded bar grating line — models, sizes and finishes.
View page →Grating Load Bar
The bearing bar itself — depth and thickness choices that set capacity.
View page →