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- Recommended spans for 2.5, 3, 4, 5 and 7.5 kPa
- Safe loads U (kPa) and C (kN/m) for spans 600–2000 mm
- Deflection at the design load
- Nominal weights for every type
- Pitch 30, 40 and 60 mm tables
How to use the tables
- Choose the design load (UDL) for the area – 2.5 kPa maintenance platforms up to 7.5 kPa heavy equipment areas.
- Measure the clear span of the bearing bars between supports.
- Pick the lightest WS code whose recommended span is equal to or greater than the clear span, or whose safe load U at that span is at least the design load.
- Check concentrated loads C (kN per metre of panel width) and the deflection limit set by the designer.
- For serrated bars apply the serration factors.
Values are indicative for carbon steel grating (SS400 / A36), single simply-supported panels with banded ends, and are not a substitute for the project design. U = safe uniform load (kPa), C = safe concentrated line load across the panel (kN/m), D = deflection (mm).
Recommended spans – light and medium duty
| WS code | Bar (mm) | Pitch 30 | Pitch 40 | Pitch 60 |
|---|---|---|---|---|
| WS-G203 | 20 × 3 | 1190 / 1060 / 1060 | 1110 / 980 / 980 | 1000 / 890 / 890 |
| WS-G253 | 25 × 3 | 1410 / 1350 / 1250 | 1310 / 1250 / 1170 | 1180 / 1130 / 1050 |
| WS-G323 | 32 × 3 | 1700 / 1620 / 1510 | 1580 / 1510 / 1400 | 1430 / 1350 / 1270 |
| WS-G403 | 40 × 3 | 2010 / 1920 / 1780 | 1870 / 1780 / 1660 | 1690 / 1610 / 1500 |
| WS-G205 | 20 × 5 | 1350 / 1290 / 1200 | 1260 / 1200 / 1120 | 1140 / 1090 / 1010 |
| WS-G255 | 25 × 5 | 1600 / 1530 / 1420 | 1490 / 1420 / 1320 | 1350 / 1290 / 1200 |
| WS-G325 | 32 × 5 | 1930 / 1840 / 1710 | 1790 / 1710 / 1590 | 1620 / 1550 / 1440 |
| WS-G405 | 40 × 5 | 2280 / 2180 / 2030 | 2120 / 2030 / 1890 | 1920 / 1830 / 1700 |
Recommended spans – heavy duty
| WS code | Bar (mm) | Pitch 30 | Pitch 40 | Pitch 60 |
|---|---|---|---|---|
| WS-G255 | 25 × 5 | 1350 / 1220 | 1250 / 1130 | 1130 / 1020 |
| WS-G325 | 32 × 5 | 1620 / 1460 | 1510 / 1360 | 1360 / 1230 |
| WS-G405 | 40 × 5 | 1920 / 1730 | 1780 / 1610 | 1610 / 1460 |
| WS-G455 | 45 × 5 | 2090 / 1890 | 1950 / 1760 | 1760 / 1590 |
| WS-G505 | 50 × 5 | 2270 / 2050 | 2110 / 1910 | 1910 / 1720 |
| WS-G555 | 55 × 5 | 2440 / 2200 | 2270 / 2050 | 2050 / 1850 |
| WS-G655 | 65 × 5 | 2760 / 2490 | 2570 / 2320 | 2320 / 2100 |
| WS-G755 | 75 × 5 | 3080 / 2780 | 2860 / 2590 | 2590 / 2340 |
| WS-G756 | 75 × 6 | 3220 / 2910 | 3000 / 2710 | 2710 / 2440 |
5.0 kPa covers factories, workshops, motor rooms and trolley channels; 7.5 kPa heavy loading areas, boiler and heavy equipment areas.
Safe loads – bearing bars at 30 mm
| Type | Bar (mm) | kg/m² (/50 / /100) | U 600 | U 800 | U 1000 | U 1200 | U 1400 | C 1000 (kN/m) | D 1000 (mm) |
|---|---|---|---|---|---|---|---|---|---|
| WS-G655/30 | 65 × 5 | 103.4 / 100.4 | 443 | 249 | 159 | 110 | 81 | 79 | 2.65 |
| WS-G605/30 | 60 × 5 | 95.9 / 92.9 | 377 | 212 | 136 | 94 | 69 | 68 | 2.89 |
| WS-G555/30 | 55 × 5 | 88.4 / 85.4 | 317 | 178 | 114 | 79 | 58 | 57 | 3.14 |
| WS-G505/30 | 50 × 5 | 80.9 / 77.9 | 262 | 147 | 94 | 65 | 48 | 47 | 3.45 |
| WS-G503/30 | 50 × 3 | 52.6 / 49.6 | 157 | 88 | 56 | 39 | 28 | 28 | 3.43 |
| WS-G455/30 | 45 × 5 | 73.4 / 70.4 | 212 | 119 | 76 | 53 | 39 | 38 | 3.83 |
| WS-G405/30 | 40 × 5 | 65.9 / 62.9 | 167 | 94 | 60 | 41 | 30 | 30 | 4.31 |
| WS-G403/30 | 40 × 3 | 43.3 / 40.3 | 100 | 56 | 36 | 25 | 18 | 18 | 4.32 |
| WS-G355/30 | 35 × 5 | 58.4 / 55.4 | 128 | 72 | 46 | 32 | 23 | 23 | 4.94 |
| WS-G353/30 | 35 × 3 | 38.6 / 35.6 | 77 | 43 | 27 | 19 | 14 | 13 | 4.84 |
| WS-G325/30 | 32 × 5 | 53.9 / 50.9 | 107 | 60 | 38 | 26 | 19 | 19 | 5.35 |
| WS-G323/30 | 32 × 3 | 35.8 / 32.8 | 64 | 36 | 23 | 16 | 11 | 11 | 5.41 |
| WS-G255/30 | 25 × 5 | 43.4 / 40.4 | 65 | 36 | 23 | 16 | 12 | 11 | 6.82 |
| WS-G253/30 | 25 × 3 | 29.3 / 26.3 | 39 | 22 | 14 | 9 | – | 7 | 6.94 |
| WS-G205/30 | 20 × 5 | 36.0 / 33.0 | 41 | 23 | 15 | 10 | – | 7 | 8.73 |
| WS-G203/30 | 20 × 3 | 24.6 / 21.6 | 25 | 14 | 9 | – | – | 4 | 8.76 |
Safe loads – bearing bars at 40 mm
| Type | Bar (mm) | kg/m² (/50 / /100) | U 600 | U 800 | U 1000 | U 1200 | U 1400 | C 1000 (kN/m) |
|---|---|---|---|---|---|---|---|---|
| WS-G655/40 | 65 × 5 | 81.7 / 78.7 | 332 | 187 | 119 | 83 | 61 | 59 |
| WS-G605/40 | 60 × 5 | 75.9 / 72.9 | 283 | 159 | 102 | 70 | 52 | 51 |
| WS-G555/40 | 55 × 5 | 70.1 / 67.1 | 238 | 133 | 85 | 59 | 43 | 42 |
| WS-G505/40 | 50 × 5 | 64.2 / 61.2 | 196 | 110 | 70 | 49 | 36 | 35 |
| WS-G503/40 | 50 × 3 | 42.6 / 39.6 | 118 | 66 | 42 | 29 | 21 | 21 |
| WS-G455/40 | 45 × 5 | 58.4 / 55.4 | 159 | 89 | 57 | 39 | 29 | 28 |
| WS-G405/40 | 40 × 5 | 52.6 / 49.6 | 125 | 70 | 45 | 31 | 23 | 22 |
| WS-G403/40 | 40 × 3 | 35.3 / 32.3 | 75 | 42 | 27 | 18 | 13 | 13 |
| WS-G355/40 | 35 × 5 | 46.8 / 43.8 | 96 | 54 | 34 | 24 | 17 | 17 |
| WS-G353/40 | 35 × 3 | 31.6 / 28.6 | 57 | 32 | 20 | 14 | 10 | 10 |
| WS-G325/40 | 32 × 5 | 43.3 / 40.3 | 80 | 45 | 29 | 20 | 14 | 14 |
| WS-G323/40 | 32 × 3 | 29.4 / 26.4 | 48 | 27 | 17 | 12 | 8 | 8 |
| WS-G255/40 | 25 × 5 | 35.1 / 32.1 | 49 | 27 | 17 | 12 | 9 | 8 |
| WS-G253/40 | 25 × 3 | 24.3 / 21.3 | 29 | 16 | 10 | 7 | – | 5 |
| WS-G205/40 | 20 × 5 | 29.3 / 26.3 | 31 | 17 | 11 | 7 | – | 5 |
| WS-G203/40 | 20 × 3 | 20.6 / 17.6 | 18 | 10 | 6 | – | – | 3 |
Safe loads – bearing bars at 60 mm
| Type | Bar (mm) | kg/m² | U 600 | U 900 | U 1200 | U 1500 | U 1800 | U 2100 | U 2400 |
|---|---|---|---|---|---|---|---|---|---|
| WS-G655/60/50 | 65 × 5 | 53.9 | 214.3 | 95.0 | 53.2 | 33.9 | 23.4 | 17.1 | 13.0 |
| WS-G555/60/50 | 55 × 5 | 46.6 | 153.4 | 67.9 | 38.0 | 24.2 | 16.7 | 12.1 | 9.2 |
| WS-G505/60/50 | 50 × 5 | 42.9 | 126.7 | 56.1 | 31.4 | 20.0 | 13.7 | 10.0 | 7.6 |
| WS-G455/60/50 | 45 × 5 | 40.0 | 102.6 | 45.4 | 25.4 | 16.1 | 11.1 | 8.1 | 6.1 |
| WS-G405/60/50 | 40 × 5 | 35.5 | 81.0 | 35.8 | 20.0 | 12.7 | 8.7 | 6.3 | 4.8 |
| WS-G403/60/50 | 40 × 3 | 23.9 | 48.6 | 21.5 | 12.0 | 7.6 | 5.2 | 3.8 | 2.8 |
| WS-G325/60/50 | 32 × 5 | 29.7 | 51.8 | 22.9 | 12.8 | 8.1 | 5.5 | 4.0 | 3.0 |
| WS-G323/60/50 | 32 × 3 | 20.4 | 31.1 | 13.7 | 7.6 | 4.8 | 3.3 | 2.4 | 1.8 |
| WS-G255/60/50 | 25 × 5 | 27.5 | 31.6 | 13.9 | 7.7 | 4.9 | 3.3 | 2.4 | 1.8 |
| WS-G253/60/50 | 25 × 3 | 17.3 | 18.9 | 8.3 | 4.6 | 2.9 | 2.0 | 1.4 | 1.0 |
| WS-G205/60/50 | 20 × 5 | 21.0 | 20.2 | 8.9 | 4.9 | 3.1 | 2.1 | 1.5 | – |
Pitch 60 grating is used for light covers, screens and maintenance areas. 20 × 5 mm bars at 60 mm pitch are not recommended in serrated form.
시장별 표준 및 요구사항
World Steel이 본 제품의 설계, 제작, 문서화에 적용하는 기준 – 그리고 각 시장의 주요 형상 및 하중 요구사항.
미국
- ANSI/NAAMM MBG 531Metal Bar Grating Manual
- ASCE 7Minimum design loads (Table 4.3-1 floor live loads)
- OSHA 29 CFR 1910 Subpart DWalking-working surfaces
- AWS D1.1Structural welding code – steel
- ASTM A123Zinc (hot-dip galvanized) coatings on iron and steel products
- CSI 05 53 00Metal gratings (MasterFormat section)
- Light manufacturing / light storage live load
- 125 psf (ASCE 7 Table 4.3-1)
- Heavy manufacturing / heavy storage live load
- 250 psf (ASCE 7 Table 4.3-1)
- Toeboard at open edges
- ≥ 3.5 in (90 mm) high (OSHA 1910.29(k))
호주 / 뉴질랜드
- AS 1657-2018Fixed platforms, walkways, stairways and ladders
- AS/NZS 1170.1Structural design actions – imposed actions
- AS 4100Steel structures
- AS/NZS 1554.1Structural steel welding
- AS/NZS 4680Hot-dip galvanized coatings on fabricated ferrous articles
- AS 4586Slip resistance classification of pedestrian surfaces
- Walkway clear width
- ≥ 600 mm (AS 1657)
- Toeboard
- ≥ 100 mm where required (AS 1657)
유럽
- DIN 24537-1Gratings as floor covering – steel gratings
- RAL-GZ 638Gratings – quality assurance
- EN ISO 14122-2Working platforms and walkways
- EN 1991-1-1Imposed loads on buildings
- EN ISO 1461Hot-dip galvanized coatings on fabricated articles
- Walkway clear width
- ≥ 600 mm, preferably 800 mm (EN ISO 14122-2)
- Toe-plate
- ≥ 100 mm high (EN ISO 14122-3)
참고용 요약입니다 – 프로젝트 시방서, 채택된 기준 판본 및 관할 기관의 요구가 우선합니다.
표면 처리
| 표면 처리 | 표준 / 비고 |
|---|---|
| Hot-dip galvanised (G) | ASTM A123 · AS/NZS 4680 · EN ISO 1461 |
| Paint coated (PP) | Blast or pickle + paint system to ISO 12944 / AS/NZS 2312.1 / SSPC |
| Untreated (U) | Black steel for painting or galvanising by others |
| Duplex | Galvanised + paint for colour or C5 environments |
자주 묻는 질문
What do U, C and D mean?
U is the safe uniformly distributed load in kPa, C the safe concentrated load across the panel in kN per metre of width, and D the deflection in mm at that load.
Can I use the tables for design?
They are for selection and budgeting. The project designer confirms loads, spans, deflection limits and the code; our engineers can provide a calculation for the selected panels.
Why are pitch 40 types lighter but weaker?
Fewer bearing bars per metre of width – about 25 % less steel than pitch 30 for the same bar size – so the safe load drops in proportion.
AS/NZS 5131 CC3
EN 1090 EXC3 · CE