QB/T 4521-2013 (English Version) PDF

Scope: This standard specifies the tolerance levels and limit deviation values for the untoleranced linear dimensions of watch parts with nominal sizes up to 3 mm. This standard applies to the following linear dimensions without tolerances from the nominal size to 3 mm for metal cutting in watches and other timekeeping instruments. Dimensions processed by non-metallic materials and other processes can also be adopted by reference: a) Linear dimensions (such as external Dimensions, internal dimensions, step dimensions, diameter, radius, dis ance); b) Linear dimensions of machined assemblies. This standard does not apply to the following dimensions: a) linear and angular dimensions involved in other general tolerance standards; b) reference dimensions in brackets; c) theoretically correct dimensions within a rectangular frame.

QB/T 4521-2013 Referenced Document

GB/T 1800.1 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 1: Basis of tolerances, deviations and fits*， 2020-04-28 Update
GB/T 1804 General tolerances Tolerances for linear and angular dimensions without individual tolerance indications

2013 QB/T 4521-2013 Tolerances for watch linear dimensions up to 3 mm without individual tolerance indications