Rock drilling — Extension drill-steel equipment for percussive long-hole drilling — Reverse-buttress-threaded equipments 1 1/2 to 2 1/2 in (38 to 64 mm)
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.
Life cycle
NOW
PUBLISHED ISO 1722:1974 90.93
Standard confirmed 29 gush 2017
Pajisje shpimi për gurë - Pajisje për zgjatjen e daltave shpuese për shpime me goditje në vrimë të thellë - Pajisjet e përforcuara me fileto në krah të kundërt 1 I/Z te 2 I/Z në (38 dhe 64 mm)
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