This standard was last reviewed and confirmed in 2022. Therefore this version remains current.
Specifies the basic dimensions for equipment. Gives a list of components; tabulates together with figures: size of drill-steel in bar form; lengths of extension rods; coupling sleeves; bit diameters (four-wing bits); reverse-buttress threads; hollow hexagonal bars for extension rods.
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|std 1 40|
|std 2 40||Paper|
A standard is reviewed every 5 years
Stage: 90.93 (Confirmed)
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