Rock drilling — Extension drill-steel equipment for percussive long-hole drilling — Reverse-buttress-threaded equipments 1 1/16 and 1 1/4 in (27 and 32 mm) ISO 1721:1974
73.100.30
Equipment for drilling and mine excavation
Buying
Published
Scope
Specifies the basic dimensions for equipment. Gives a list of components; tabulates together with figures: shank adapters for central flushing, hexagon type and lug-shank type; extension rods; coupling sleeves; four-wing bits; reverse-buttress threads; hollow hexagonal bars for extension rods; hexagonal drill-steels.
Life cycle
NOW
PUBLISHED ISO 1721:1974 90.93
Standard confirmed Dec 6, 2022