This International Standard describes an inspection procedure to be used by the purchaser where no prior agreement exists. It also describes a reference acceptance procedure for acceptance or rejection of an inspection lot, when no agreement can be reached between the purchaser and the supplier, or where conformance to specification is disputed. It applies to inspection lots of bolts, screws, studs, nuts, pins, washers, rivets and other related fasteners. For in-process control procedure or inspection during manufacturing or sorting, see ISO 16426.