This document establishes a Standard Practice for Swaged Nipples and Bull Plugs produced for a number of years by various manufacturers to varying dimensions although basically similar in principle. Users should note Swaged Nipples@ and Bull Plugs furnished from existing stocks may have slightly different dimensions than shown herein. The values stated in either inch units or metric units are to be regarded separately as standard. Within the text@ the metric units are shown in parenthesis. The values stated in each system are not exact equivalents; therefore@ each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Tables 1 through 3 show fittings dimensional requirements in inches. Tables A1 and A2 show the dimensional requirements for millimeter dimensional fittings. This Standard Practice covers dimensions@ finish@ tolerances@ marking and material for carbon steel and alloy steel Swaged Nipples (male end reducing fittings)@ NPS 1/4 through NPS 12 and Bull Plugs (hollow or solid male closures) NPS 1/8 through NPS 12. These fittings are made with ends that are threaded@ beveled@ square cut@ grooved@ or any combination of these. Both concentric and eccentric Swaged Nipples are included. Partial Compliance Fittings - Fittings with special dimensions and fittings made from non-standard materials may be designed and manufactured by agreement between the manufacturer and the purchaser@ provided they are marked in accordance with the requirements for partial compliance fittings of Section 4.1e. Partial Compliance Fittings Fittings with special dimensions and fittings made from non-standard materials may be designed and manufactured by agreement between the manufacturer and the purchaser@ provided they are marked in accordance with the requirements for partial compliance fittings of Section 4.1e.