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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)
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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)

PUBLISH DATE 1974
ISO 1721:1974

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.
SDO ISO: International Organization for Standardization
Document Number ISO 1721
Publication Date Aug. 15, 1974
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 82
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