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What is the rotational capacity test?

April 26, 2017rotational Test

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What is the rotational capacity test?

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The rotational capacity test is defined in ASTM A325, Paragraph 6.3. It is a test to determine the efficiency of the lubricant required for both hot dipped and mechanically deposited zinc coated nuts. The test involves full size product. The initial tightening of the nut shall produce a load in the bolt not less than 10% of the specified proof load. The nut is then rotated 240 – 420 , depending upon bolt length. Upon removal of the nut, there shall be no shear failure of the threads, torsional bolt failure, or other signs of failure.