What is steel grating?
Steel grating is an open floor made of parallel load-bearing flat bars (25–50 mm deep, 3–5 mm thick) joined at right angles by cross bars, leaving 60–80 % open area so water, light, snow and dust fall through while people, trolleys and — with heavier bars — vehicles pass over it. Two joining methods exist: press-welded grating, where twisted or square cross bars are resistance-welded into the bearing bars under pressure (the industrial standard, the strongest per kilogram), and press-locked grating, where notched cross bars are pressed into notched bearing bars without welding (a cleaner look for architecture and sun screens). Both are hot-dip galvanized after fabrication, so every cut and weld is zinc-coated. It is the floor of pipe racks, boiler houses, substations, treatment plants, jetties, mezzanines and stair towers, and the cover of trenches and drains.
Types of steel grating we supply
| Type | How it is made | Typical bar / pitch | Use |
|---|---|---|---|
| Press-welded (forge-welded) | Twisted cross bar welded under pressure every 100 mm | 30×3 – 50×5 · 30/100, 34/100 | Platforms, walkways, pipe racks, mezzanines |
| Press-locked | Notched cross bars pressed into bearing bars, no weld | 25×3 – 40×3 · 33/33, 34/38 | Architectural floors, façades, sun screens, drain covers |
| Heavy-duty | Bearing bars 50–100 × 5–10 mm, pitch 30–60 mm | 50×5 – 100×10 | Vehicle areas, loading bays, trench covers under trucks |
| Serrated | Bearing bar top edge notched for grip | any | Oily, wet or icy floors — refineries, food plants, offshore |
| Stair treads | Panel with checker-plate or serrated nosing and end plates | 30×3, 30×5 · 30/100 | Stair towers, tank access, platforms |
| Stainless 304 / 316 | Press-welded or press-locked from stainless flat | 25×3 – 40×5 | Food, pharma, chemical, coastal and pool areas |
| Compound (grating + checker plate) | Grating with a 3–4 mm checker plate welded on top | 30×3 + 3 mm plate | Solid floor with grating stiffness, spill areas |
Bearing bar sizes and weight per m²
| Bearing bar (mm) | Pitch (mm) | Open area | Weight (kg/m²) | Panel 1 000 × 6 000 (kg) |
|---|---|---|---|---|
| 25 × 3 | 30/100 | ≈ 78 % | ≈ 22 | ≈ 132 |
| 25 × 3 | 34/38 | ≈ 75 % | ≈ 24 | ≈ 144 |
| 30 × 3 | 30/100 | ≈ 78 % | ≈ 26 | ≈ 156 |
| 30 × 3 | 34/38 | ≈ 75 % | ≈ 28 | ≈ 168 |
| 30 × 5 | 30/100 | ≈ 72 % | ≈ 39 | ≈ 234 |
| 40 × 3 | 30/100 | ≈ 78 % | ≈ 33 | ≈ 198 |
| 40 × 5 | 30/100 | ≈ 72 % | ≈ 51 | ≈ 306 |
| 50 × 5 | 30/100 | ≈ 72 % | ≈ 62 | ≈ 372 |
| 60 × 5 | 30/100 | ≈ 72 % | ≈ 73 | ≈ 438 |
| 70 × 6 | 40/100 | ≈ 75 % | ≈ 76 | ≈ 456 |
Pitch = bearing-bar centres / cross-bar centres. Other bars (35×3, 40×4, 50×4, 80×6, 100×8) and pitches (25, 40, 60 mm) to order.
Load and span table
| Bearing bar | 600 mm | 800 mm | 1 000 mm | 1 200 mm | 1 500 mm |
|---|---|---|---|---|---|
| 25 × 3 | 8.0 | 4.5 | 2.9 | — | — |
| 30 × 3 | 11.6 | 6.5 | 4.2 | 2.9 | — |
| 30 × 5 | 19.0 | 10.9 | 7.0 | 4.8 | — |
| 40 × 3 | 20.7 | 11.6 | 7.4 | 5.2 | 3.3 |
| 40 × 5 | 34.0 | 19.4 | 12.4 | 8.6 | 5.5 |
| 50 × 5 | — | 30.0 | 19.4 | 13.5 | 8.6 |
| 60 × 5 | — | — | 28.0 | 19.4 | 12.4 |
For orientation only — the bearing bars must span between supports. Walkways to EN ISO 14122-2 need ≥ 2 kN/m² (and a 1.5 kN point load); plant floors 5 kN/m²; trench covers under forklifts need heavy-duty bars sized per axle load. We confirm the section with a DIN 24537 calculation for your span before quoting.
Platforms cut to drawing
Send the platform layout (PDF or DWG) and we cut, notch and band every piece on our own laser and saw lines in Dilovası: cut-outs for columns and pipes with banding bar welded around, toe plates (kick plates) 100 × 5 mm, hinged or lift-out sections, curved pieces, and the fixing-clip count. Each piece is stamped with the drawing position number and the panels are shipped in the erection order, so site work is bolting only. Panels come with the banding bar (end bar) welded on both ends; unbanded cut panels are cheaper for straight runs cut on site.
Stair treads
Grating stair treads are made from the same panel with a serrated or checker-plate nosing welded to the front edge and drilled end plates (carrier plates) for bolting to the stringer. Standard widths 600–1 200 mm, depths 240 and 270 mm, bearing bars 30 × 3 or 30 × 5, in hot-dip galvanized or stainless; two M12 bolt holes per end plate at 40 mm from the edge. We quote treads per piece and can match them to the platform grating in one order.
Finish — hot-dip galvanized, stainless or painted
| Finish | Standard | Coating | Typical life (C3 industrial) |
|---|---|---|---|
| Hot-dip galvanized after fabrication | EN ISO 1461 | ≥ 55 µm (3–6 mm bar), ≥ 70 µm (≥ 6 mm bar) | 25–40 years |
| Black (self-colour) | — | none, mill finish | for painting on site or indoor dry areas |
| Painted / powder-coated on HDG (duplex) | EN ISO 12944 | HDG + 60–80 µm | 40+ years, colour to RAL |
| Stainless 304 (1.4301) | EN 10088-2 | pickled and passivated | indefinite in C3, food and pharma |
| Stainless 316L (1.4404) | EN 10088-2 | pickled and passivated | coastal, chemical, chlorinated water |
Fixing clips and accessories
- Saddle clips (grating clips) type A/B — M8 bolt, for I-beam and angle supports, 4 per panel
- Welding lugs — for permanent platforms
- Toe plates (kick plates) 100 × 5 mm HDG
- Banding / end bars, cut-out banding
- Hinges and lifting handles for removable sections
- Drain-cover frames (L 40 × 40 × 4 and L 50 × 50 × 5) HDG
- Stair-tread nosing strip and end plates
Drain and trench covers
Trench and channel covers are grating panels cut to the channel width plus a galvanized angle frame cast into the concrete. For pedestrian and light-vehicle areas we use 30 × 3 to 40 × 5 press-welded grating at 30 mm pitch; under forklifts and trucks, heavy-duty 50 × 5 to 100 × 10 bars at 30–40 mm pitch, or a compound grating with checker plate. Heel-proof pitch (≤ 12 mm gap) is available in press-locked form for public walkways.
Tolerances and quality
Panels are fabricated to DIN 24537-1: length ±5 mm, width ±3 mm, bearing-bar height ±0.5 mm, flatness ≤ 3 mm per metre; twisted cross bars fully welded at every intersection (press-welded) or fully pressed (press-locked). Galvanizing to EN ISO 1461 with coating thickness measured per lot; stainless grades supplied with EN 10204 3.1 certificates. Every shipment includes the panel list with dimensions, weights and position numbers.
Price
Grating is quoted per m² for standard panels and per piece for cut platforms and treads; the main drivers are the bearing-bar section (steel weight per m²), the pitch, the finish and the amount of cutting. Standard 30 × 3 30/100 HDG panels are the cheapest per m²; cut-to-drawing platforms add the laser and banding work; stainless is priced by weight. Send the m², the section and the drawing for a firm FOB Istanbul quote.
Bands from our weekly export list (September 2026), FOB Istanbul, full-container quantities, excluding freight and certificates. Firm price per project on RFQ within one working day.
Export and packing
Panels are strapped flat on timber skids of 1–1.5 t, stair treads and clips boxed; platform pieces bundled per drawing position. HS code 7308.90. 40' HC takes about 20–24 t of grating (≈ 700–900 m² of 30 × 3), 20' about 10 t.
| Term | Detail |
|---|---|
| MOQ | 50 m² of panels or one platform set |
| Incoterms | FOB Istanbul · CIF / CFR Gulf, East & West Africa · DAP EU, Balkans, Iraq, Caucasus · DAP Aktau |
| Lead time | Standard panels 7–12 working days; cut platforms and treads 2–3 weeks; stainless 3–4 weeks |
| Packing | Panels flat on timber skids 1–1.5 t, strapped; treads and clips in crates or cartons |
| Container / truck | 40' HC ≈ 20–24 t (≈ 700–900 m² of 30×3) · 20' ≈ 10 t |
| Documents | Invoice, packing list, EN 10204 3.1, galvanizing certificate, certificate of origin; SASO / SONCAP on request |
| Payment | 30% advance, balance against B/L copy |
Certificates
EN 10204 3.1 for the flat bar and the stainless material, galvanizing certificate per EN ISO 1461 with coating readings, load calculation per DIN 24537 on request, certificate of origin and chamber-legalised documents for Gulf and African destinations.
How to order
State the bearing bar (e.g. 30 × 3), the pitch (30/100), the finish (HDG / 304 / 316), the panel sizes or the platform drawing, the number of stair treads with width × depth, and the clips. If you only know the span and the load, give those two numbers and we will select the section.
Standards
- EN 10025-2 S235JR bearing bar
- EN ISO 1461 hot-dip galvanizing (≥ 70 µm on ≥ 6 mm, ≥ 55 µm on 3–6 mm)
- DIN 24537-1 / RAL-GZ 638 (load tables, tolerances)
- ANSI/NAAMM MBG 531 (US bar grating)
- EN ISO 14122-2 (working platforms and walkways)
Grades
Grade data sheets (chemistry, mechanicals, equivalents) are on our reference site: S235JR · S275JR · 1.4301 / 304
Frequently asked questions
What is a steel grating?
An open steel floor made of parallel bearing bars (25–50 mm deep, 3–5 mm thick) joined by cross bars, leaving 70–80 % open area; it is hot-dip galvanized after welding and used for platforms, walkways, stair treads and drain covers.
What are the different types of steel grating?
Press-welded (forge-welded) grating with twisted cross bars is the industrial standard; press-locked grating has notched cross bars pressed in without welding for a cleaner look; heavy-duty grating uses 50–100 mm bearing bars for vehicles; serrated grating adds grip; stainless 304/316 for food, chemical and coastal use; compound grating carries a checker plate on top.
What is the main purpose of grating?
A load-bearing floor that lets water, light, air, snow and dust pass through — it drains itself, does not collect spills, weighs a third of a solid plate for the same stiffness and needs no anti-slip treatment.
Which grating size do I need for a walkway?
For a walkway on supports every 800–1 000 mm, 30 × 3 mm bearing bars at 30 mm pitch (30/100) carry the 2 kN/m² required by EN ISO 14122-2 with margin; over 1 200 mm use 30 × 5 or 40 × 3; plant floors at 5 kN/m² need 40 × 3 up to 1 000 mm or 40 × 5 up to 1 200 mm.
How much does steel grating weigh per m²?
About 22 kg/m² for 25 × 3 at 30/100, 26 kg/m² for 30 × 3, 39 kg/m² for 30 × 5, 51 kg/m² for 40 × 5 and 62 kg/m² for 50 × 5, hot-dip galvanized; a 1 000 × 6 000 mm panel of 30 × 3 weighs about 156 kg.
Is the grating galvanized before or after welding?
After — the whole fabricated panel, including cut edges, banding bars and cut-outs, is hot-dip galvanized to EN ISO 1461 (≥ 55 µm on 3–6 mm bars, ≥ 70 µm on thicker bars), which is why it lasts 25–40 years in industrial air without paint.
Can you cut the grating to my platform drawing?
Yes — we cut, notch and band every piece on our own laser and saw lines from your PDF/DWG layout, stamp each piece with its position number, add toe plates and clips, and ship in erection order.
What is the standard panel size?
1 000 × 6 000 mm (bearing bars along the 6 000 mm length) is the mill panel; we also stock 1 000 × 3 000 and cut any size — bearing-bar direction must always run between the supports.
How is steel grating fixed to the steel structure?
With galvanized saddle clips (top clip + M8 bolt + bottom hook, four per panel) on I-beams and angles, or by welding lugs for permanent platforms; stair treads bolt through their end plates with two M12 bolts each.