Trench Covers & Channel Gratings — Heavy Duty Access Solutions
Every drainage channel, cable trench, and service duct on a site needs a cover that carries the traffic above it, drains the water below it, and lifts out when crews need access. GoGrating fabricates trench covers and channel gratings to order from our works in Anping, Hebei — the wire-mesh and grating production hub that supplies the majority of China's output, with 800+ fabrication plants within 30 km. Because every trench is different, we do not sell standard panels off the shelf: each cover is cut, banded, and framed to your channel width, length, and duty rating.
Our trench covers ship to EPC contractors, importers, and distributors across the Middle East, Southeast Asia, Europe, Australia, and Latin America, with our FRP grating line also serving US buyers. Fabrication follows YB/T 4001.1 and ANSI/NAAMM MBG 531, with hot-dip galvanizing to ASTM A123, under an ISO 9001 quality system with CE documentation for export.
What Are Trench Covers?
A trench cover is a removable grating panel that spans a linear opening in a floor or pavement — typically a drainage channel, cable run, pipe trench, or utility duct. Unlike solid plate, an open-bar grating cover lets surface water pass straight through into the channel while providing a slip-resistant walking or driving surface above. Panels are usually seated in an embedded angle frame cast into the concrete, so covers sit flush with the finished surface and can be lifted individually for cleaning and maintenance.
You will find trench gratings in wastewater treatment plants, highways and car parks, food and beverage facilities, substations, refineries, ports, and airports — anywhere services run below grade. Selecting the right cover comes down to three questions: what loads cross it, what environment surrounds it, and how often it must be lifted. See our applications overview for sector-specific guidance.
Types of Trench Covers
Welded steel trench covers are the workhorse for vehicular and industrial duty. Built from our standard welded steel grating with bearing bars from 20×3 mm up to 100×9 mm, they handle everything from footpath channels to heavy plant crossings. Hot-dip galvanizing to ASTM A123 is the default finish for outdoor and drainage service; untreated (for site painting or embedding) and painted finishes are also available.
Stainless steel trench covers in grade 304 or 316 suit food processing, pharmaceutical, marine, and chemical environments where hygiene or corrosion resistance rules out galvanized carbon steel. FRP trench covers — molded or pultruded, in orthophthalic, isophthalic, or vinyl ester resins — offer full corrosion immunity, electrical non-conductivity, and light weight that lets one worker lift a panel by hand. Covered (gritted solid-top) FRP panels are available where small-object fallthrough must be prevented.
For frequent-access trenches we can supply covers with angle-frame edging, hinged sections, lifting holes, or bolt-down locking devices — specify these requirements at the quotation stage.
Trench Cover Specifications
Trench covers are engineered items, and the correct bearing bar section depends on your clear span, load class, and safety factor. As a rule, light pedestrian channels use shallow bars at the lower end of the range, while F900-class covers for ports and airfields require deep, heavy-section bars, close pitch, and reinforced framing — often with banded ends and full perimeter frames. We size each cover against the relevant standard rather than quoting generic capacities; contact us for engineered load tables matched to your span and duty class.
Pitch options follow the 19-space and 15-space series, with cross bars typically at 50 mm or 100 mm centers, and serrated bearing bars available for slip-critical surfaces. Panel lengths and widths are cut to your trench schedule, so there is no fixed panel size — send dimensioned drawings or CAD files and we will return a fabrication drawing for approval before production. Request a quote with your trench dimensions, load class, and environment, and our engineers will respond with a full specification.
| Bearing bar size | 20×3 mm to 100×9 mm (flat or serrated) |
| Bearing bar pitch | 19-space and 15-space series (≈30 mm / ≈40 mm centers) |
| Cross bar pitch | 50 mm or 100 mm typical; others to order |
| Load classes | Designed to EN 124 A15 through F900 (engineered per span) |
| Panel dimensions | Cut to trench schedule — no fixed stock sizes |
| Steel materials | Carbon steel Q235/Q345; stainless 304 / 316 |
| FRP options | Molded, pultruded, covered; ortho, iso, vinyl ester resins |
| Surface treatment | Hot-dip galvanized (ASTM A123), untreated, painted |
| Accessories | Embedded angle frames, hinges, lifting holes, locking clips |
| Standards | YB/T 4001.1, ANSI/NAAMM MBG 531, ISO 9001, CE |
- Made to order — no stock SKUs, panels cut to your channel dimensions
- Steel, hot-dip galvanized, stainless 304/316, or FRP construction
- Designed around EN 124 load classes A15 through F900
- Angle-frame edging, hinges, and locking devices available
- Fabricated to YB/T 4001.1 and ANSI/NAAMM MBG 531
- ISO 9001 factory with CE-marked export documentation
Frequently Asked Questions
Can you fabricate trench covers to our project drawings?
Yes — custom fabrication is our standard model, not the exception. Send dimensioned drawings, CAD files (DWG/DXF/STEP), or a simple trench schedule with widths, lengths, and load class. Our engineers return a fabrication drawing for your approval before production begins, including frame details, banding, and any hinges or locking devices.
What load class should I specify for my trench covers?
Load class depends on the traffic crossing the trench: EN 124 defines A15 for pedestrian areas through F900 for airport pavements and docks. We do not publish generic load numbers because capacity depends on clear span and bar section together. Tell us your span and duty, and we will provide engineered load tables for the specific configuration.
What is the MOQ and typical lead time for export orders?
Minimum order quantities are flexible and assessed per project — trial orders and mixed-specification containers are common for new distributors. Production lead time depends on quantity, finish, and current schedule; galvanized steel covers and FRP panels run on separate lines. Request a quote with your bill of quantities and we will confirm a firm production and shipping schedule.
Should I choose steel or FRP trench covers?
Choose hot-dip galvanized steel for vehicular loads, heavy industry, and the lowest cost per load class. Choose stainless 304/316 for hygiene-critical or corrosive food, pharmaceutical, and marine settings. Choose FRP where chemical exposure, electrical conductivity, or manual lifting weight are the deciding factors — FRP panels are roughly a quarter the weight of comparable steel.