NTERNATIONAL STANDARD (TSO 1721 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPTAHM3ALIWA HO CTAHIAPTH3AIWH.ORGANISATION INTERNATIONALE DE NORMALISATION 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) Forage des roches -- Materiels pour forage percutant de longs trous -- Equipements a filetage a butée inverse 1 1/16 et 1 1/4 in (27 et 32 mm) First edition - 1974-08-15 UDC 622.233.5 Ref. No. ISO 1721-1974 (E) Descriptors : mining, drilling equipment, percussion drilling. Price based on 6 pages Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through isO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. Prior to 1972, the results of the work of the Technical Committees were published as Iso Recommendations; these documents are now in the process of being Committee iSO/TC 82 has reviewed ISO Recommendation R 1721 and found it suitable for transformation. International Standard ISO 1721 therefore replaces ISO Recommendation R 1721-1970. ISO Recommendation R 1721 was approved by the Member Bodies of the following countries : Austria Hungary Poland Beigium India South Africa, Rep. of Canada Iran Spain Czechoslovakia Israel Sweden Italy Egypt, Arab Rep. of Thailand France Japan Turkey Germany Netherlands United Kingdom Greece New Zealand Yugoslavia No Member Body expressed disapproval of the Recommendation. The Member Body of the following country disapproved the transformation of ISO/R 1721 into an International Standard : Canada @ Internationat Organization for Standardization,1974 Printed in Switzerland d without license from IHS Not for Resale ISO 1721-1974 (E) INTERNATIONAL STANDARD 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) 1 SCOPE AND FIELD OF APPLICATION 3 LIST OF COMPONENTS This Internationai Standard specifies the basic dimensions for reverse-buttress-threaded extension dri-steel equipment 1 1/16 in light 1 1/4 in light Equipment (27 mm) (32 mm) for percussive long-hole drilling, of the following nominal sizes : Thread diameter 1 1/16 in 11/4 in 1 1/16 in light (27 mm) Size of drill rod in bar 7/8 in hexagonal 1 in hexagonal 1 1/4 in light (32 mm) form (22 mm) (25 mm) Shank adapters, hexagon type See clause 4 2 REFERENCE Shank adapters, lug-shank ISO 723, Rock drilling - Forged collared shanks and chuck See clause 5 type bushings for hollow hexagonal drill-steels. mm ft mm ft 915 915 34568 3 1 220 1 220 4 Lengths of extension rods 1 525 1 830 (clause 6) 1830 6 2 435 2 435 8 3.050 10 Coupling sleeves See clause 7 mm in mm in 41 15/8 45 1 3/4 Bit diameters 48 17/8 (four-wing bits) 51 51 2 (clause 8) 57 21/4 64 2 1/2 Reverse-buttress threads See clause 9 Hollow hexagonal bars for See clause 10 extension rods 1 Not for Resale