BS 6620-2:1991

Committees responsible
National foreword
Guide
0. Introduction
1. Scope and field of application
2. References
3. Definitions
4. Material and design
5. Tolerances
6. Testing
7. Designation and ordering
Annex
Examples
Tables
1. Pitch/hole ratios and related open areas
2. Examples of round hole perforations
3. Examples of square hold perforations
4. Examples of tolerances on pitch
Figures
1. Round holes: 60 deg staggered arrangement
2. Square holes: in-line arrangement
3. Square holes: half-pitch staggered arrangement

Describes three patterns using round and square perforations in plate of less than 3 mm thickness.

This part of ISO 7805 describes three patterns using round (circular) and square perforations in plate of less than 3 mm thickness; the sizes of holes range down to 2 mm for square holes and to 0,5 mm for round holes. Five ratios of pitch to hole are specified which result in nominal open areas ranging from about 60 % to 23 %. Tolerances for both hole and pitch are given.

NOTE Industrial plate screens of thicknesses of 3 mm and above are dealt with in ISO 7805-1, Industrial plate screens – Part 1: Thickness of 3 mm and above.