Careful attention is given to selecting the correct flange and gasket, whilst selection of the correct fasteners is often neglected. All elements of a flange assembly must be suitable if a leak free joint is to be obtained and maintained; bolts, studs, and nuts, are the fasteners that allow this to occur. This section deals with bolts, studs, screws, nuts, washers, bolting procedure, and their importance with relation to flanges.
Bolting Criteria
Bolting criteria for a given flange is determined by the associated standard. For example, a flange of a certain size and class may have the following pre-defined factors:
Number of bolts required.
Length of bolt required.
Diameter of bolt required.
Material of bolt required.
Position of bolts on the flange blade.
The number of bolts required will always be a multiple of 4 e.g. 4, 8, 12, 16 etc. As the size and class of a flange increases, so too does the number of bolts required and their diameter.
50nb (2") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
65nb (2.1/2") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
80nb (3") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
100nb (4") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
125nb (5") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
150nb (6") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
200nb (8") PN6 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
50nb (2") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
65nb (2.1/2") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
80nb (3") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
100nb (4") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
125nb (5") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
150nb (6") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
200nb (8") PN16 CORE Flange Pack contains all the components necessary for flange sealing. Each kit comprises of a WRAS Approved BS7531 Grade X Gasket (1.5mm thick) and a full set of bolts, nuts and washers, Bright Zinc Plated (BZP) as standard. Maximum Working temperature 250°C
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