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)
NORMA vydána dne 1.9.1974
Označení normy: ISO 1722:1974
Datum vydání normy: 1.9.1974
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO
Description / Abstract: 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.