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ISO 1721:1974

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)

Standard Details

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.

General Information

Status : Published
Standard Type: Main
Document No: ISO 1721:1974
Document Year: 1974
Pages: 6
Edition: 1
  • ICS:
  • 73.100.30 Equipment for drilling and mine excavation

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ISO 1721:1974
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