BSENISO 11381:2016 BSl Standards Publication Ophthalmicoptics- Spectacle frames - Screw threads (isO 11381:2016) bsi. BS EN ISO 11381:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN ISO 11381:2016. It supersedes BS EN ISO 11381:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CH/172, Ophthalmicoptics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 93615 9 ICS 11.040.70 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2016. Amendments/corrigenda issued since publication Date Text affected EN IS0 11381 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM 0ctober2016 ICS 11.040.70; 21.040.10 Supersedes EN IS0 11381:1996 English Version Ophthalmic optics - Spectacle frames - Screw threads (ISO 11381:2016) Optique ophtalmique - Montures de lunettes - Filetages Augenoptik - Brillenfassungen - Schraubgewinde (ISO (IS0 11381:2016) 11381:2016) This European Standard was approved by CEN on 5 September 2016 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard thestatus ofa national standardwithout any alteration.Up-to-datelistsand bibliographicalreferences concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status asthe official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,Former YugoslavRepublic of Macedonia,France,Germany,Greece,Hungary,Iceland, Ireland,Italy,Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEENDENORMALISATION EUROPAISCHES KOMITEE FURNORMUN G CEN-CENELECManagementCentre:AvenueMarnix17,B-1o00Brussels 2016CEN Allrightsofexploitationinanyformandbyanymeansreserved Ref. No. EN IS0 11381:2016 E worldwideforCENnational Members.