din-9021-shajba参考标准资料

UDC621.882.42March 1990Large size washersD丽9021Scheiben:AuBendurchmesser 3 x Gewinde-NenndurchmesserSupersedes July 1974edition.In keeping cwith current practice in standards published by the International Organization for Standardization (ISO).acomma has been used throughout as the decimal marker.Dimensions in mm1 Scope and field of applicationThis standard specifies requirements for product grades Aand C washers with a large outside diameter,i.e.washers with anoutside diameter approximately equal to three times the nominal thread diameter of bolts with which the washers areintended to be used.The preferred application of these washers is in assemblies of hexagon head bolts and nuts withwidths.across flats as specified in ISO 272.2 DimensionsddTable 1.Clearance holeOutside diameter,Thickness,ForApproximatediameter.dd2hmassNominalnominal(7.85kg/dm3).sizethread ofmin.=Nominalper 1000 units,diameternominalma关nominalmin.sizemaminsizesizein kg2,72,52,72.84⊙7.640.80.90,70,283,233.23.3898.640.80,.90,70.3493,73.53.73.881110.570.80.9070,.5294,344.34,481211.571.10.90.7745.35.35.481514.57121.41.466.46.46.621817.571.61,81.42,797,477.47.622221.482221.85,298,488.48.622423,4822,21.86,2310.51010,510,773029,482.52.72,312,213121313.273736,3833,32,722,215141515.274443,3833.32,731,617161717.275049.3833.32,740,920182020,525654.1g4.63.467,422202222,526058.14.63.476,826242626,847270.1564139333033349289.86727339363940110107.889,26.8522Continued on pages 2 and 3246