A close up of aluminium chequered plate with lentil pattern.

The side back of chequered plate with lentil pattern.

Table 1: Base thickness, permissible variation and theoretical weight of the diamond plate
Base thickness
(mm)		 Permissible variation (mm) Theoretical weight (kg/m2)
Diamond pattern Lentil pattern Round projection
2.5 ± 0.3 21.6 21.3 21.1
3.0 ± 0.3 25.6 24.4 24.3
3.5 ± 0.3 29.5 28.4 28.3
4.0 ± 0.4 33.4 32.4 32.3
4.5 ± 0.4 37.3 36.4 36.2
5.0 ＋ 0.4
－ 0.5		 42.3 40.5 40.2
5.5 ＋ 0.4
－ 0.5		 46.2 44.3 44.1
6.0 ＋ 0.5
－ 0.6		 50.1 48.4 48.1
7.0 ＋ 0.6
－ 0.7		 59.0 52.6 52.4
8.0 ＋ 0.6
－ 0.8		 66.8 56.4 56.2