Ideal Double Nut M8 Zinc Plated 057991

The Ideal 057991 is an M8 double nut with a zinc plated finish, supplied as part of the Ideal Commercial Boiler Spares range. A double nut of this type is used to lock a threaded fixing in position, with the second nut tightened against the first to prevent the assembly working loose under vibration. It is a small but load-bearing fastener, so the thread and plating both matter when a replacement is needed.

• Visible corrosion or white/grey zinc breakdown on the nut faces or thread
• The nut spins freely or will not hold torque, indicating a stripped or worn thread
• Flats rounded off by a previous spanner or socket, making correct tightening impossible
• The joint it secures has worked loose, with movement or weeping at the fixing point
• A nut lost during strip-down that cannot be matched from the van stock

• Confirm the appliance model and, where available, the serial number against the compatibility list before ordering
• Check the existing nut for thread size and pitch, as M8 fasteners are not interchangeable across all fixings
• Note the quantity required, since a double nut fixing uses two nuts per point
• Check whether a washer, gasket or seal is also needed at the same joint before reassembly