Description: Proving Rings are designed for the calibration of concrete testing machines and other types of testing machines with limited daylight openings. These rings are built with forged and machined steel loading ring with a vibrating - reed/micrometer screw deflection measuring apparatus. It conforms precisely to the specifications mentioned by National Institute of Standards and Technology. Proving rings are available for use in compression only or as a combination model for both tension and compression use. The combination model has threaded external bosses for attachable pulling rods to make it easily adaptable for use in tension. The proving rings meet ASTM specifications for calibrating testing machines. The proving rings are available from 500 to 1,000,000 pounds in compression or tension/compression models. The proving rings are used for the calibration of physical testing machines, load cells, rocket thrust stands, weighing systems and other force measurement equipments.
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