International Organization for Standardization (ISO)
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ISO 7805-1:1984
Scope
Describes three patterns using round (circular) and square perforations in low carbon steel plate of 3 mm thickness and above. The sizes of holes range from 125 to 3.15 mm inclusive. Five ratios of pitch to hole are prescribed which result in nominal open areas ranging from about 64 to 23 %.
ISO 7805-1:1984 history
1984ISO 7805-1:1984 Industrial plate screens; Part 1 : Thickness of 3 mm and above