This type of serrated steel grating welded round bar in the middle of every two flat bars.

Ningbo Jiulong Machinery Manufacturing Co., Ltd is the second largest steel grating manufacturer in China. We have 7 running lines with yearly capacity of 50, 000tons. Jiulong grating has exported to more than 30 countries.

Founded in 1992, covering an area of 25,000 square meters and with workshop area of 18,000 square meters, NJMM has advanced equipments, full-fledged technology as well as rich manufacturing and management experience in press-welded steel grating area for many years. NJMM is among the few leading manufacturers who have the entire production process from bearing bar to galvanized steel grating. Now NJMM has owned six International advanced auto-pressed welding machines, and the annual production capacity of steel grating, stair tread, trench cover, stanchion and guardrail is over 50,000 tons, of which more than 30,000 tons are for export. NJMM markets its products mainly in North America, South America, Europe, Oceania, Middle East , Southeast Asia, etc. Its marketing and service scope has covered all provinces in China and Longta gratings are widely applied to lots of renowned projects at home and abroad, such as sightseeing walkway of Sydney port, .Beijing Olympic Games stadium, Chunxiao oil-gas filed of East China Sea, and Hangzhou bay bridge. 

Being an advanced unit of environmental protection,NJMM had got ISO9001-2000 Quality Management System Certificate in the year 2001 and complete inspection facility.NJMM can provide high-quality products for customers. NJMM always persists the idea of expending scale to reduce the cost and striving for develepmentwith quality these years.Owing to superior location and as the leading role pladed in steel grating area in China.NJMM sincerely promises to all customers at home and abroad,"we will try to satisfy our customers with top quality,good service and most competitive price."
Features:
1) Bearing bar specification: 20 x 3 to 100 x 6

2) Bearing bar pitch: 12.5, 15, 30, 40, 60mm etc, also be according to client's requirement and 30, 40, 60mm are recommended

3) Cross bar pitch: 38, 50, 76, 100mm, also be according to client's requirement and 50, 100mm are recommended

4) Material: Mild steel or stainless steel

5) Surface treatment: Untreated, painted or hot-DIP galvanized

6) Steel Grating Standards:
A) China: YB/T4001-1998
B) USA: ANSI / NAAMM (MBG531-88)
C) UK: BS4592-1987
D) Australia: AS1657-1985