This Section of BS 1560 specifies requirements for circular grey and malleable cast iron flanges having Class 125 and Class 250 designations and ductile cast iron1) flanges having Class 150 and Class 300 designations. The flanges are in the range of nominal sizes ½ in to 24 in and of the type given in Table 1. Table 1 — Types of grey, malleable and ductile cast iron flanges Code no.a Description 205 Blank flange 212 Hubbed slip-on flange for welding 213 Hubbed threaded flange 215 Loose hubbed flange for lapped pipe end 221 Integral flange NOTE 1 Figure 1 illustrates flanges according to description and code numbers. NOTE 2 Flanges may be designated by description or code numbers. a Code numbers have been made non-consecutive to permit possible future additions. This Section of BS 1560 specifies the types of cast iron flanges and their facings, dimensions, bolt sizes, flange face surface finish, marking, materials for bolting and flange materials together with their associated pressure/temperature ratings. NOTE 1 To assist purchasers Appendix A lists information which should be supplied when ordering flanges. NOTE 2 Dimensional details of attachment for welded flanges of ductile cast iron (code 212) and threaded flanges of grey and ductile cast iron (code 213) attached to ductile and grey cast iron pipes to BS 4772 and BS 4622 (see 7.1) and their routine inspection and pressure testing are outside the scope of this Section of BS 1560 but some guidance is given in Appendix B. NOTE 3 The titles of the publications referred to in this standard are listed on page 17.