1. Scope

1.1 Thsi specification covers black or galvanized welded or seamless threaded steel couplings for use with steel pipe in NPS 1/8 to NPS 20 inclusive (Note 1). Coulings ordered under this specification are internded for the user outlined in the pipe specifications referencing this specification.

Note 1- The dimensionless designator NPS(nominal pipe size)has been substituted in this standard for such tradtional terms as nominal diameter, size, and nominal size.

1.2 The values stated in inch-pound units are to be regarded as standard. The metric values may be approximate.