Drainage cover grating is widely used in city construction projects due to its protection
from thieves. Its frame is made up of angle steel, and it has embedded parts to
prolong its service life. The frame connects to steel grating with hinges, and
has the advantages of being easy to open and pickproof. We can make products of
detailed sizes as our customers need.

Ningbo Jiulong Machinery Manufacturing Co.,Ltd is the second largest steel grating manufacturer in China whose capacity is 50000 tons one year!! Our products are a part of construction.

We produce steel grating, stair tread, fence,clips, chench cover, handrail stanchion, walkway, steel ladder and so on. These products are widely used on mine, factory plant, Oil industry,shipbuilding, marine engineering, airport project, construction industry and so on.

Standard descriptions:

1. Bearing bar(load bar):20x3 ..... 75x10 mm.

2. Bearing bar pitch: 12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 32.5, 35, 40mm. US standard: 1"x3/16", 1 1/4"x3/16", 1 1/2"x3/16",  1"x 1/4", 1 1/4"x 1/4", 1 1/2"x 1/4" etc.

3. Cross bar pitch: 38,50,76,100,101.6mm

4. Material: Q235, Stainless 304

5. Surface treatment: black, galvanized, paint

6.Standards:

1).China: YB/T 4001.1-2007

2).USA: ANSI/NAAMM(MBG531-88)

3).UK: BS4592-1987

4).Australia: AS1657-1985