Factory-direct steel gratings & stair treads, shipped worldwide
19W4 Serrated Grating
19W4 serrated teeth bite wet or oily soles. Fewer slips on site.
Serrated or plain tops · Itemized quote within 24 hours · Free drawing review included
19W4 serrated, made in-house
Serrated or plain tops on our own weld and press lines
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 × surface
One Mesh, Two Tops: 19W4 Serrated vs 19W4 Plain
19W4 serrated grating is a combination specification, not a separate product. The 19W4 mesh stays exactly as the designation reads — bearing bars on 19/16 in (about 30 mm) centers, W for welded, cross bars on 4 in (about 100 mm) — and the top of every bearing bar carries sheared teeth instead of a smooth edge. Here is where that combination earns its place.
| Dimension | 19W4 Serrated | 19W4 Plain | Serrated Bar Grating |
|---|---|---|---|
| Mesh geometry | 19/16 in (≈30 mm) bar centers · W welded · 4 in (≈100 mm) cross bars | Identical mesh — only the top differs | Same teeth on 40 / 60 mm pitches or heavier bars |
| Top profile | Teeth sheared along the top edge of every bearing bar | Smooth, flat bearing-bar tops | Same tooth pattern across the full bar range |
| Underfoot behavior | Tooth edges meet the sole at an angle — geometry designed to bite wet or oily soles | Dependable footing on dry, clean floors | Same tooth action; wider openings change the walk feel |
| Default where | Outdoor industrial platforms, oily plants, wash bays, ramps and stairs | Dry plant floors, hygiene zones, stainless interiors | Trench covers and heavy-duty decks needing bigger bars |
| Materials & finish | Q235B · SS304 / SS316 · black or HDG (ASTM A123 / ISO 1461) | Same materials and finishes | Same — including galvanized serrated bar grating |
| Our supply | In-house — serrated tops on our electro-forging line | In-house — same lines, smooth tops | In-house — full 20×3 to 100×8 mm bar range |
Not sure whether your floors need teeth? Send your drawings — we will spec it inside the 24-hour quote.
How the serration works
Serration Mechanics, Described as Geometry
1 · Teeth on every bearing bar
Serration is a cutting step, not a coating: the top edge of each flat bar is sheared into a repeated tooth profile before the panel is welded. Every bar that crosses the walking direction therefore carries the same row of small ramps.
2 · How the teeth meet a sole
On a wet or oily floor, a thin liquid film can separate a smooth bar from footwear. Tooth edges run at an angle to the sole, so the tread pattern catches on them in series along the walking direction while the open mesh lets the liquid fall away.
3 · Why the 19W4 pitch suits it
At about 30 mm bar centers, each footfall crosses several toothed bars in the walking direction, and the mesh stays open enough to shed water, oil and debris. That balance is why the 19W4 pattern with serrated tops is the default industrial outdoor spec.
The honest alternative: on dry, clean or washdown floors the smooth top of plain grating sweeps and hoses down faster, with no crevices to hold soil — check it before you over-specify teeth.
Why specify 19W4 serrated
Why Buyers Specify 19W4 Serrated Grating From the Mill
From the mill, no middlemen
19W4 serrated panels leave our own workshop — quotes and engineering answers come from the people who run the weld line. Factory-direct pricing, FOB Tianjin, itemized quote on request.
Custom serrated sizes, small MOQ
The stock 19W4 pattern or fully custom pitches, panel sizes and notches — cut and banded to your drawings with the surface you mark. Small trial orders are welcome; drawing review is free.
Serrated or plain, with papers
Both surfaces come from one panel range with one paper trail: certified & tested, reports on request, mill test certificate to EN 10204 Type 3.1 with every order.
Applications
Where the 19W4 Serrated Combo Is the Default
Whenever the walking surface stays wet, oily or weather-exposed, buyers stop asking "serrated or plain?" and start asking "which pitch?" — the teeth are assumed. These are the zones where that assumption is standard practice.
Outdoor platforms & walkways
Rain, frost and morning dew sit on every outdoor steel floor — the serrated 19W4 pattern is the conventional default for plant exteriors.
Oily plants & wash bays
Machining lines, food washdown and grease pits: open mesh drains the film downward so the teeth meet the sole, not a puddle.
Ramps, stairs & escape routes
Slopes and treads ask the most of footwear grip; serrated tops with nosing on treads are the usual pairing on industrial stairs.
Wet utility & sump decks
Water-treatment galleries, pump rooms and drainage walkways stand over standing water — toothed bars and free-draining mesh carry the duty.
Specifications
19W4 Serrated Grating Specifications
| Parameter | Range |
|---|---|
| Designation | 19W4 — bearing bars 19/16 in (≈30 mm) centers · W = welded · cross bars 4 in (≈100 mm) |
| Bearing bar | 20×3 mm to 100×8 mm, serrated top |
| Bar spacing | 30 mm centers in the 19W4 pattern; 40 / 60 mm equivalents on request |
| Cross bar | Twisted square or round, per specification |
| Panel width | Up to 1.25 m |
| Panel length | Up to 6 m |
| Materials | Q235B serrated carbon steel bar grating · SS304 / SS316 stainless |
| Surface | Serrated teeth, black or hot-dip galvanized (ASTM A123 / ISO 1461); plain top optional |
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
Load tables & calculators → · 19W4 designation page — loads & weights →
Standards & compliance
What We Can Document — and What We Will Not Claim
ANSI / NAAMM MBG 531
Serrated welded panels produced to MBG 531 reference practice, with joint inspection on our five-stage QC plan.
ASTM A123 / ISO 1461 HDG
Galvanized serrated bar grating gets coating-thickness checks by sampling on every galvanized batch before release.
CE & SGS tested
Certified & tested, reports on request — material, weld and coating documents you can verify, not a certificate wall.
On anti-slip, stated plainly: slip behavior depends on your contaminant, your footwear and your site, so we make no slip-test or anti-slip certification claims. What we specify and check is the geometry — teeth on every bar, at the 19W4 pitch — and the paper trail behind the steel. Standards hub — market-by-market comparison →
Custom made
Custom Serrated Panels, Cut and Banded to Your Drawings
Send your drawing
Panel sizes, loads, quantities — or just photos and a sketch. Mark which zones need serrated tops and which can stay plain. Drawing review is free.
Quote within 24 hours
Itemized, FOB Tianjin as standard — EXW or CIF on request. Small trial orders welcome, so one platform can prove the surface before a full order.
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
Ask for a 19W4 Serrated Quote Today
Ask for a 19W4 Serrated quote today — an itemized offer lands within 24 hours, free drawing review included, and samples are ready in 5–7 working days.
- 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 19W4 mean on a serrated grating?
19W4 is a stock bar-grating designation: bearing bars on 19/16 in (about 30 mm) centers, W for welded construction, and cross bars on 4 in (about 100 mm) centers. The serrated version keeps that exact mesh and swaps the smooth top of each bearing bar for sheared teeth.
When should I choose serrated instead of plain tops?
Choose serrated where the walking surface runs wet, oily or weather-exposed — outdoor platforms, wash bays, oily plants, ramps and stairs. Choose plain tops on dry, clean or hygiene floors, where the smooth surface sweeps and hoses down faster. We supply both from the same 19W4 panel range.
Do you slip-test your serrated grating?
No — we make no slip-test claims. We specify geometry instead: teeth sheared along the top of every bearing bar, on 30 mm centers, with open mesh that drains water and oil away from the sole. Conditions differ site by site, so evaluate the surface in your own conditions; samples ship in 5–7 working days.
Related pages
Related Safety Grating Pages
Serrated Grating
Serration fundamentals — how the tooth itself works, at any pitch.
View page →Serrated Bar Grating
Serration across the whole bar-grating range — 30, 40 and 60 mm centers.
View page →Galvanized Serrated Grating
The serrated + hot-dip galvanized combination for permanent outdoor duty.
View page →Serrated Steel Bar
The serrated bearing bar itself — sizes, profiles and material options.
View page →Grating Plain
The honest smooth-top alternative for dry, clean and hygiene floors.
View page →19W4 Steel Grating
The designation page — loads, weights and panel dimensions of the 19W4 family.
View page →