API Specification 10D provides minimum performance requirements, test procedures and marking requirements for bow-spring casing centralizers for the petroleum and natural gas industries.
The procedures provide verification testing for the manufacturer's design, materials and process specifications, and periodic testing to confirm the consistency of product performance.
API Spec 10D is not applicable to rigid or positive centralizers.

This edition of API Spec 10D is the identical national adoptionof ISO 10427-1:2001, Petroleum and natural gas industries-Casing centralizers-Part 1: Bow-spring casing centralizers. This specification contains the API Monogram Annex as part of the U.S. national adoption.