4757 internationai Standard ISO INTERNATIONALORGANIZATION FOR STANDARDIZATIONMEKAYHAPOAHAA OPTAHW3AUMA IQ CTAHAAPTW3ALMWSORGANISATION INTERNATIONALE DE NORMALISATION Cross recesses for screws Empreintes cruciformes pour vis First edition1983-08-01 SO 47.57-1983 (E) UDC 621.882.215.6 Ref. No. ISO 4757-1983 (E) Descriptors : fasteners, screws, cruciform recessed screws, dimensions. Price based on 9 pages Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationof national standards bodies (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 authorized 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. International Standard ISO 4757 was developed by Technical Committee ISo/TC 2, Fasteners, and was circulated to the member bodies in December 1981. It has been approved by the member bodies of the following countries: Australia Germany, F.R. Norway Austria Hungary Poland Belgium India Romania Brazil Ireland South Africa, Rep. of Canada Italy Spain China Japan Sri Lanka Czechoslovakia Korea, Dem. P. Rep. of Sweden Denmark Korea, Rep. of Switzerland Egypt, Arab Rep. of Mexico USA Finland Netherlands USSR France New Zealand The member body of the following country expressed disapproval of the document on technical grounds: United Kingdom ? Intornational Organization for Standardization, 1983 PrintedinSwitzerland Cobvriaht International Oroanization for Standardization INTERNATIONAL STANDARD ISO 4757-1983 (E) Cross recesses for screws 1 Scope and field of application This International Standard defines two types of cross recesses for screws: recess type H; - recess type Z. Included in this International Standard is a method of penetration gauging for both types.