Common use of NUTS, BOLTS AND STUDS Clause in Contracts

NUTS, BOLTS AND STUDS. All nuts, bolts, etc. shall be to an approved standard. Bolts or studs which are subject to high temperature and pressure shall be to an approved material specification with nuts of similar material. All fasteners shall be suitably protected from corrosion at all stages until finish painting is carried out. Bolts and studs for electrical connections shall preferably be of brass M6 size. Alternatively size M5 may be used, but these must be of stainless steel, phosphor bronze or high tensile brass. Nuts and pins shall be locked in position with lock nuts or lock washers, or other devices, if approved. Lock washers shall not be used above M24 size except when a spring type is specially approved. No bolt or stud shall project through its nut by more than approximately 10 mm or four threads whichever is the less, except for terminals and relay stems. Bolts, nuts and washers on outdoor equipment shall be of non- corroding material where they are in contact with non-ferrous parts in conductor clamps and fittings and elsewhere if specially required. Suitable special spanners shall be provided for bolts and nuts which are not properly accessible by means of an ordinary spanner.