The AMERICAN mechanical joint, furnished in pipe sizes 4” to 12” and in fitting sizes 4” to 48”, is a flexible stuffing box type connection used primarily in underground service.
The AMERICAN mechanical joint was developed by the American Cast Iron Pipe Company and first marketed in 1929. Since that time, millions of feet of AMERICAN pipe equipped with this joint have been installed to give dependable service across the nation and in many foreign countries. The joint is designed with a stuffing box into which a rubber gasket is compressed by a ductile iron gland drawn up with low-alloy steel bolts. It affords liberal deflection before joint compression and allows expansion and contraction of the line without leakage. It is rated for a water working pressure of up to 350 psi.
Originally designed to meet the rigid requirements of the gas industry for a pressure-tight joint, the AMERICAN mechanical joint was instrumental in starting a nationwide trend toward rubber-packed joints for water service as well as gas service. Its design was widely accepted and it soon became the standard joint of the iron pipe industry.
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