1. 8264. Which statement regarding aircraft bolts is correct? A. When tightening castellated nuts on drilled bolts, if the cotter pin holes do not line up, it is permissible to overtighten the nut to permit alignment of the next slot with the cotter pin hole. B. In general, bolt grip lengths should equal the material thickness. C. Alloy steel bolts smaller than 1/4-inch diameter should not be used in primary structure.