The diameter of the straight flange shall be more than one third of the diameter of the grinding wheel to be mounted, a clearance be more than 1.5 millimeters and the contact width based on the diameter of the wheel be the value as shown in Attachment table 22.If the flange sets on the cutting-off grinding wheel which has the highest using peripheral velocity below 80 meters per second and which is reinforced by means of glass-cloth material with tensile strength over 71 kilograms or other equivalents, then the diameter of the straight flange for that wheel can be over one fourth of the diameter of that wheel regardless of the provisions in the preceding paragraph.Attachment table 22.pdfAttachment table 22.doc