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16/02/2019 - API SPEC 7-1 (R2015) ADDENDUM 4

Specification for Rotary Drill Stem Elements Addendum 4 of API 7-1 (R2015) - Specification for Rotary Drill Stem Elements has been published on February 1st, 2019. Main changes/sections amended are: - §7.10 Marking of Lift Subs (Figure 6 - type D) - Table 11 minimum surface hardness of dimension DR of type B Drill Stem Subs - Table 12 dimension of lift-subs upper lift diameters (link to table 7 of API 8C) - Table 12A dimension data for lift sub upper lift diameter (link to table 7 of API 8C) - Table C.1 mechanical properties and tests for heavy section tools

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