ISO 691:2005 PDF

Scope: This International Standard specifies tolerances on wrench and socket openings for screws and nuts (or similar parts) having metric width across flats dimensions, as shown diagrammatically below. It gives, for each dimension, the tolerances for general use, defined by its two deviations, minimum and maximum, with respect to the nominal value. These deviations have been determined in relation to the width across flats tolerances for screws and nuts specified in ISO 4759-1 and with regard to the manufacture of tightening tools.

ISO 691:2005 history

2005 ISO 691:2005 Assembly tools for screws and nuts - Wrench and socket openings - Tolerances for general use
1997 ISO 691:1997 Assembly tools for screws and nuts - Wrench and socket openings - Tolerances for general use
1983 ISO 691:1983 Wrench and socket openings; Metric series; Tolerances for general use
1975 ISO 691:1975 Title missing - Legacy paper document