Factory-direct steel gratings & stair treads, shipped worldwide
Galvanized Steel Slot Drain
Handles storm water and truck wheels alike. Slot Drain built for real sites.
Itemized quote within 24 hours · Free drawing review included
In-house weld & press lines
Channel bodies, frames and gratings under one roof
Certified & tested
Reports on request, batch tested, MTC with every order
Samples in 5–7 days
Production in 15–25 working days
FOB Tianjin
Shipped worldwide, EXW / CIF negotiable
Format comparison
Narrow-Slot Drain vs Open-Grating Channel
A slot drain and a grating-covered channel move the same water — they differ in what stays on top and how you clean the run. This page leads with the slot format; the honest trade-offs are below.
| Dimension | Narrow-Slot DrainThis format | Open-Grating Channel |
|---|---|---|
| Appearance | A single narrow slot in the paving — the drain nearly disappears | A visible open grid running along the channel line |
| Water entry | Water sheets across the surface and drops through the slot | Water falls straight through the full open area |
| Debris handling | Screens out cans, bottles and most litter; fine grit settles in the channel | Large debris enters openly — needs upstream baskets or regular raking |
| Maintenance access | Cleaning through sump and outlet points, or removable slot sections | Lift the grating anywhere along the run for full-width cleaning |
| Load path | Slot top carries wheel loads on a closed steel frame | Bearing bars span the open channel at 30 / 40 / 60 mm centers |
| Best suited | Paved plazas, footpaths, kerb lines with light debris | Heavy debris zones: yards, washdown areas, leafy streets |
Honest note on heavy debris zones
If your drain collects solids — machining chips, washdown grit, heavy leaf loads — a full-grating channel is usually the better tool, because every metre opens for shoveling and flushing. A slot only screens what you then have to flush out from the ends. We supply both formats and will say so in the quote: compare the galvanized channel drain and trench grating lines, or send both layouts and we price them side by side.
Not sure which format fits your site? Send your drawings — we will spec it inside the 24-hour quote.
How the formats are built
One Channel Line, Two Ways to Finish It
1 · The slot format
A closed galvanized channel sits under the paving with only a narrow slot open to the surface. Water sheets across the pavement and drops in; cans, bottles and most litter stay on top.
2 · The open-grating alternative
The same channel line can carry a full-width metal drainage grate instead. Water and debris enter freely — and every metre of the run lifts for shoveling and flushing.
3 · Hot-dip galvanizing
Channel bodies, slot tops and gratings go to our certified galvanizing partner for ASTM A123 / ISO 1461 hot-dip galvanizing — typically 2–3 days, already counted inside your production window.
Why specify slot format
Why Contractors Specify Galvanized Slot Drainage Grating
High flow, truck-wheel strong
One steel system handles storm water and truck wheels alike. Slot tops close the load path over a steel frame; open-grating runs use bearing bars from 20×3 to 100×8 mm, chosen by load class.
Channel, covers and gratings from one factory
Channel bodies, edge frames, slot tops, gratings and covers are fabricated together to your drawings — no mismatched interfaces between three suppliers, one consistent hot-dip galvanized finish.
Any run length, made to spec
Sections up to 6 m joined to your layout, with outlets, end caps and sump positions cut per drawing. Free drawing review inside the 24-hour quote — built to last, batch tested.
Applications
Where the Slot Format Earns Its Place
Slot drains suit paved surfaces and kerb lines — anywhere the drainage should collect water without collecting the site. A metal drainage grate is not the only way to finish a channel; the slot hides the drain in the paving.
Paved plazas & forecourts
Continuous paving with a single slot to catch sheet flow — safe for heels and trolleys, easy to wash down.
Kerb lines & road edges
A linear slot along the kerb intercepts storm water before it crosses the carriageway; tops rated for crossing traffic.
Driveways & parking areas
Wheel-rated galvanized steel where lighter channel materials crack; slot top or open grating chosen by debris load.
Yards & washdown areas — check first
Where solids, chips or washdown grit enter the drain, a removable-grating channel usually beats any slot — full access for cleaning. We supply both and will tell you which fits.
Specifications
Galvanized Slot Drain Specifications
| Parameter | Range |
|---|---|
| Construction | Channel body + edge frame + slot top, or removable-grating runs — to drawings |
| Frame / bearing bar steel | 20×3 mm to 100×8 mm, plain or serrated |
| Bar spacing (grating runs) | 30 / 40 / 60 mm centers |
| Section length | Up to 6 m, joined to your run layout |
| Channel / panel width | Up to 1.25 m |
| Materials | Q235B carbon steel, hot-dip galvanized · SS304 / SS316 optional |
| Surface | Hot-dip galvanized to ASTM A123 / ISO 1461 |
| Accessories | Outlets, end caps, sump boxes and covers per drawing |
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. Drainage lines 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 classes & standards
EN 124 Load Class Guide for Slot Drains
Class names referenced to EN 124, the public standard for gully covers and gratings — a sizing reference for the conversation, not a certification claim.
| EN 124 class | Typical duty | Recommended steel (our range) | Where slot drains fit |
|---|---|---|---|
| A15 | Pedestrian & cycle areas | 20×3 mm frame bars | Plazas, footpaths, forecourts |
| B125 | Kerbside & domestic driveways | 25×3 – 30×3 mm | Kerb lines, parking edges |
| C250 | Commercial kerbs & parking bays | 30×5 – 40×5 mm | Delivery yards, bus stops |
| D400 | Carriageways & loading bays | 50×5 mm up to 100×8 mm | Road-edge slot runs, dock aprons |
Produced to EN 124 classes
Slot tops and gratings produced to the class you specify — final construction confirmed in your itemized quote against the actual wheel loads.
ASTM A123 / ISO 1461 HDG
Galvanized coating thickness checked by sampling on every galvanized batch before channels and tops are released.
CE & SGS tested
Certified & tested, reports on request — we show documents you can verify, not a certificate wall.
Custom made
Slot Drain Lines, Cut and Fabricated to Your Drawings
Send your layout
Run lengths, slot widths, channel depth, outlet positions, wheel loads — or just photos and a sketch. Drawing review is free.
Quote within 24 hours
Itemized, FOB Tianjin as standard — EXW or CIF on request. Small trial orders welcome.
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
Send your slot drain layout for a factory quote — channel runs, slot widths, outlets and wheel loads. We reply within one business day, 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
Prefer to talk? WhatsApp us or sales@dtsteelladder.com
Request your quote
Five fields — we do the rest.
FAQ
Frequently Asked Questions
What is the lead time for a galvanized steel slot drain order?
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.
Slot drain or open-grating channel — which do I need?
Specify a slot drain where the surface should read as continuous paving and debris is mostly leaves and grit: plazas, footpaths and kerb lines. Specify a full-grating channel where heavy debris or washdown solids enter the drain — the removable grating opens every metre for cleaning. Send both layouts in one email and we price them side by side.
How is a galvanized slot drain shipped and priced?
Shipped worldwide from Tianjin Port — FOB Tianjin as standard, EXW or CIF negotiable. Channel bodies, frames, slot tops, gratings and covers are quoted as one itemized package per metre or per m²; we do not publish a fixed price list.
Related pages
Related Drainage Pages
Galvanized Channel Drain
The HDG channel line this slot format is built on.
View page →Galvanized Drainage Channel
Channel + grating + accessories specified as one system.
View page →Galvanized Channel Grating
Open-grating options for the same channel runs.
View page →Slot Drain Stainless Steel
Slot-width selection guide by use, in SS304 / SS316.
View page →Stainless Slot Drain
Stainless slot drains for architectural interiors.
View page →Metal Channel Drain
Channel drain fundamentals and grating options.
View page →