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This is the socket member of a spherical joint and conforms to ASTM E677 standard dimensional requirements for interchangeability in spherical ground joints for ordinary laboratory and industrial applications. Like most of the other glassware in our catalog, this part is made from Schott Duran® glass or its equivalent.
The matching ball member and appropriate clamps are also available (see below). For a discussion of ball joint sizing, see the Joints entry in the Glassware Gallery.