Fasteners (Nuts, Bolts etc.)All nuts, bolts or studs etc. shall be manufactured from stainless steel grade 316 S11, (A4) unless otherwise specified, and be of an appropriate grade of strength for the application.Bolts and studs used to connect flanges shall be of the diameter recommended for use with the flange drillings, and be of sufficient length to give full thread engagement of the nut after the inclusion of washers and any auxiliary items e.g. Brackets etc.When connecting pipework to proprietary items the fixings supplied or recommended by the manufacturer shall be used unless otherwise advised.