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BS 1726-3
BS 1726-3
BS 1726-3 is a British Standard issued by the British Standards Institution (BSI) giving guidance to specification, tolerancing, and mechanical testing of cylindrical helical torsion springs made from round wire and bars. This 3rd part of the BS 1726 series pertains to parallel-aged helical torsion springs, which are commonly used in mechanical assemblies in automotive, aerospace, electronics, and industrial equipment. The standard replaces BS 1726-3 and continues to be a reference standard in the UK for the evaluation of torsion springs. As a world-renowned precision testing instrument manufacturer, Presto possesses torque measurement solutions that resonate well with the testing requirements stipulated in this standard.
Significance
Torsion springs play a vital role in mechanical applications, storing and releasing rotational energy in various devices, including hinges, latches, levers, and actuators. It is imperative that these springs meet specific torque, dimensional, and tolerance specifications for proper and consistent operation and assembly life expectancy of the systems in which they are used. The standard BS 1726-3 gives a standardized approach that connects the engineering design intent to the product that is manufactured so that quality can be verified, suppliers communicated with exactly, and the product's functionality can be dependable in many different engineering applications. BS 1726-3 covers parallel-sided helical torsion springs using round wire or bar and includes two groups of springs: Group A springs may or may not have stress relieved after forming, and Group B springs have a different structure of material after the forming process due to heat treatment. The standard offers two methods for specifying springs for general purposes and one defined method for mechanical testing. It encompasses dimensional tolerances, form tolerances, ordering information, and torque testing procedures, providing manufacturers and purchasers with a comprehensive reference for quality assurance and procurement specifications.Scope