EnZar®

Steel Bar Grating Manufacturing Tolerance

All steel gratings are produced in accordance with manufacturing tolerances as set forth by NAAMM. And all dimensions given are maximum permissible tolerances.

Bearing Bar & Cross Rod Tolerances

Cross Rod Spacing and Alignment. Cross rods should not vary more than 1/8 in 12 in either direction from perpendicular alignment with bearing bars.

The tolerance of the cross bar spacing for 5'0" in length is ±1/4".

A drawing shows cross rod spacing and alignment of steel bar grating.

Cross rod spacing and alignment

Cross rod Position. The top of cross rod should not project more than 1/16" above the top of the bearing bars for standard grating (1/8" for heavy duty) and should not extend more than 1/8" from side of bearing bars.

A drawing shows cross rod and bearing bars position of steel bar grating.

Cross rod position

Bearing Bar Lean. Bearing bar lean must not exceed a slope of 1-1/4 to 12.

A drawing shows bearing bar lean of steel bar grating.

Bearing bar lean

Cross Bar Lean. Cross bar lean must not exceed a slope of 2-1/2 to 12.

A drawing shows cross bar lean of steel bar grating.

Cross bar lean

Panel Tolerance

Longitudinal Bow. Longitudinal bow should be less than 1/200 of the length for standard grating (1/240 for Heavy-Duty).

A drawing shows longitudinal bow of steel bar grating.

Longitudinal bow

Transverse Bow. Before banding, the transverse bow should be less than 1/8" per foot of width.

A drawing shows transverse bow of steel bar grating.

Transverse bow

Overall Dimensions and Squareness

  • D = Overall diagonal dimension
  • W = Length of cross rods including extensions outside of bearing bars
  • L = Length of bearing bars
A drawing shows overall dimensions and squareness of steel bar grating.

Overall Dimensions and Squareness