· Steel Grating Installation Tolerances

All dimensions are maximum permissible tolerances

Installation Note:

Minimum support dimension: A minimum of 25mm for bearing bars up to 50mm deep and a minimum of 50mm for bearing bars>50mm deep.

We recommend that the land on the support should be equal to the height of the bearing bar.

Grating Cantilevers: Grating cantilevers up to 250mm in the bearing bar direction are acceptable as long as the grating is securely anchored to the support(not clips).

Cantilevers in the cross bar direction are not acceptable.

· Industry Terminologies of Steel Gratings

· Steel Grating Manufacturing Tolerances

1. Overall Dimensions and Squareness

Standard Fabrication Welding

Edge bars and attachments are welded with a minimum 3mm fllet weld to one side of:

Every 5th load bar on Series 30 Grating

Every 4th load bar on Series 40 Grating

Every 3rd load bar on Series 50 Grating

Optional Welding

Full Weld: Weld one side of every load bar.

Seal Weld: Weld both sides of every load bar

2. Cross Bar Alignment Spacing

3. Longitudinal and Transverse Bow

4. Cross Bar Location and Load bar lean

5. Stair Tread Tolerances