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Hot Dip Galvanized Steel Grating- GI Steel Grating Specification of Steel Grating: 1. The shape of bearing bar: Plain type (may be omitted in the symbol of steel grating), Serrated type and I-Shape type 2. Bearing bar pitches can be 12.5, 15, 20, 30, 30.16, 32.5, 34.3, 40, 60mm, of which 30mm & 40mmare recommended. 3. Cross bar pitches can be 38, 50, 60,100mm, of which 50mm & 100mm are recommended. 4. Surface treatment: Hot-dip galvanizing, paint or other anti-corrosive coatings are available, of which hot-dip galvanizing is generally recommended. 5. Material: Q235 in line with GB/T700 steel 6. Tolerance The allowed deviation of length is +0/-5mm, while the allowed deviation of width is +/-5 mm. The non-perpendicularity of bearing bar is allowed no more than 10% of width of bearing bar. Cross bar surface should not surpass bearing bar surface 1mm, beginning & end of cross bar should not surpass the end surfaces of two sides of grating 2mm. 7. Standard:   The most popular specifications of steel graing: 1.Steel grating with 30mm bearing bar pitch is the most widely used in industrial area. Among the general series, it maintains the strongest resistance to impulsive force. 2.Steel grating with 40mm bearing bar pitch is one of the most economical & lightest types. It should be the best choice to customer on the occasion when the clear span is small. 3.Steel grating with 60mm bearing bar pitch & 50mm cross bar pitch is developed specially for mining industry. As it can avoid the mineral splashing down on board, its appointed to use in fabrication plant, transfer terminal & other areas of mining. Steel Grating Saddle Clip: Type A saddle clip- composed of a top board with double hooks, a holding down plate with teeth and M8 inner-hexagon-bolt. Type B saddle clip- composed of a top board with double hooks (one of hooks can draw together the two neighboring steel gratings), and a holding down plate with teeth and a M8 inner-hexagon-bolt. Type C saddle clip-composed of a top board with double hooks and a M8 hexagon-bolt can be welded in supporting structure Instruction of Selecting Steel Grating: 1) Light & medium duty  Maximum recommended spans 2) Heavy duty Maximum recommended spans
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