Provides requirements for performance, design, materials, testing and inspection, welding, marking, handling, storing and shipping of drill-through equipment used for drilling for oil and gas. It also defines service conditions in terms of pressure, temperature and wellbore fluids for which the equipment will be designed.

This Standard is applicable to and establishes requirements for the following specific equipment:

ram blowout preventers;
ram blocks, packers and top seals;
annular blowout preventers;
annular packing units;
hydraulic connectors;
drilling spools;
adapters;
loose connections;
clamps.

This International Standard does not apply to field use or field testing of drill-through equipment.

This edition of API Spec 16A is a modified adoption of ISO 13533, Petroleum and natural gas industries-Drilling and production equipment-Drill through equipment.