Does the ASTM Require a Rotational Capacity Test for A490 Structural Bolts?
No, ASTM does not require a rotational capacity test for A490 structural bolts. The reason for this is that the purpose of the rotational capacity test per ASTM is to evaluate the presence and efficiency of the lubricant used in a bolt and nut combination. Lubrication is used with galvanized bolts since there is additional friction resulting from the galvanizing of the bolt threads. Therefore, ASTM requires that a rotational capacity test be performed on galvanized A325 structural bolts and not plain finish A325 Structural Bolts. Since A490 heavy hex structural bolts cannot be galvanized, ASTM does not require a rotational capacity test be performed on them.
Update: The newer F3125 structural bolt standard, which combines six bolting standards, A325, A325M, A490, A490M, F1852, and F2280 does layout procedures for rotational capacity testing on A490 bolts. However, the F3125 standard only requires this testing be performed when requested.