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)
NORM herausgegeben am 1.9.1974
Designation standards: ISO 1722:1974
Publication date standards: 1.9.1974
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: International technical standard
Kategorie: Technische Normen 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.