Centre drills for centre holes without protecting chamfers. Type A1 Scope This International Standard specifies the dimensions of centre drills for centre holes without protecting chamfers (Type A). It covers only metric dimensions, which are regarded as the only recommended dimensions in the future for this type of drill. The flutes may be straight or spiral, depending on the manufacturers discretion. Unless otherwise indicated, these drills will be right hand cutting. Recommended dimensions for Type A centre

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It also describes methods which apply principally to cements

ISO/IEC 10538 applies only to text made up of characters

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This sample can then be used for subsequent detection of moulds by cultivation after suspension

NOTE 1 Historically method A has been used for weathering applications for many years: Method B has been developed recently

ISO 20764 specifies two procedures for the preparation of test portions from petroleum and related products boiling above 200 °C

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Details about performance requirements and markings have also been provided in ISO 4347

profiled glass and glass block products

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This British Standard specifies requirements for five basic series of glass hydrometers of constant mass which are graduated to indicate density (kg/m3 or g/ml) when used at 20 °C