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Bell-and-Spigot Joint This joint for underground cast-iron pipe was developed as long ago as 1785. Standard dimensions are shown in Table A2.22. The joint may be made up with lead and oakum, sulfur compounds, or cement. Lead and oakum constitute the prevailing joint sealer for sanitary systems. Bell- and-spigot joints are usually reserved for sanitary sewer systems. These joints are not used in ductile iron pipe. Mechanical (Gland-Type) Joint This modification of the bell-and
Bolting Bolting material for cast-iron flanges is listed in ASME B16.1. Generally, ASTM A307, grade B material is suitable. For steel flanges, acceptable bolting material is listed in ASME B16.5. Threading. Bolts and nuts normally are threaded in accordance with ASME B1.1 Standard for Unified Screw Threads. In diameters 1 in and smaller, Class 2A fits on the bolt or stud and Class 2B on the nut applies with the coarse thread series. In diameters 1¹⁄₈ in and larger, the eight-