Foreword: As a matter of information@ and for the guidance of manufacturers and users who may require these data@ this bulletin gives minimum performance properties on proposed high-strength casing joint@ as developed by the API committee on Standardization of Oil Country Tubular Goods@ in the course of a study of internal-upset casing sizes and related data. At the 1946 meeting the committee authorized publication of the data herein as an informational bulletin (not as an API standard).