din-912-vint参考标准资料

UDC621.882.215.61.091.1December 1983Hexagon socket head cap screws瓜(modified version of ISO 4762)912Zylinderschrauben mit Innensechskant;ISO 4762 modifiziertSupersedes September 1979 editionAs it is current practice in standards published by the International Organization for Standardization (ISO),the commahas been used throughout as a decimal marker.This standard contains the main specifications of ISO 4762-1977,adopted in a modified form,with national addenda.These addenda are shaded grey in clauses 1 and 3 to 6.Dimensions in mm1 Field of applicationThis standard specifies product grade A hexagon socket head cap screws with metric screw threads and thread diam-eters from 1 4 to 100 mm 1).If,in exceptional cases,the screws are to meet requirements other than those given inthis standard,these shall be selected in accordance with the appropriate standards.2 DimensionsPermissible alternativeform of socketPoint chamfered (chamfered point inaccordance with DIN 78):for sizes s M4,the point need not be chamfered2Pma×.incompletethread(b)Slight rounding orcountersink permissibleat the mouthd only applies toof the socketpositive values ofBottom edge of head may berounded or chamfered to dwMaximum underheadbut shall be deburredfilletfmax.17rmax:3m-d,ar2刘2see tableTop head may beradiused or chamfered1)In ISO 4762,the range is M 1,6 to M 36.2)In ISO 4762,this is given incorrectly as rmaxan application has been made to ISO to correct thisContinued on pages 2 to 12131