1、DEUTSCHE NORM SeDtember 1999 Plastic washers Large series DIN 3481 6 ICs 21.060.30 Scheiben aus Kunststoff - Groe Reihe In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Forewor
2、d This standard has been prepared by Technical Committee Verbindungselemente aus Kunststoff of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). All dimensions are in millimetres. 1 Scope This standard specifies dimensions and mechanical and physical properties for
3、 unchamfered plastic wash- ers, large series (.e. washers with an outside diameter approximately equal to three times the nominal thread diameter). 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cit
4、ed at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edi
5、tion of the publication referred to applies. DIN 4000-3 DIN 53479 DIN 53483-2 DIN EN IS0 179 DIN EN IS0 527-1 Plastics - General principles for the determination of tensile properties DIN EN IS0 2039-1 Plastics - Determination of hardness - Part 1: Ball indentation method DIN EN IS0 4759-3 Tolerance
6、s for fasteners - Part 3: Plain washers for bolts, screws and nuts - Product grades A and C (ISO/DIS 4759-3 : 1998)*) IEC 93 : 1980 Methods of test for insulating materials for electrical purposes - Volume resistivity and surface resistivity of solid electrical insulating materials Tabular layouts o
7、f article characteristics for washers Determination of density of plastics and elastomers Determining the dielectric properties of insulating materials at standard frequencies of 50 Hz, 1 kHz and 1 MHz Plastics - Determination of Charpy impact strength (IS0 179 : 1993) (IS0 527-1 : 1993 + Corr 1 : 1
8、994) (IS0 2039-1 : 1993) *) Currently at draft stage. Continued on pages 2 and 3 Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of V Deutsches
9、Institut fur Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN 34816 : 1999-0 English price group 05 Sales No. 0105 11 .o0 Page 2 DIN 3481 6 : 1999-09 Nominal size (thread size) 3 4 5 6 8 10 12 16 3 Dimensio
10、ns Washer dimensions shall be as given in figure 1 and table 1 Hole diameter, d, Outside diameter, d, Thickness, h Min. Max. Max. Min. size Max. Min. 32 3,38 9 8,64 0,8 03 0,7 4,3 4,48 12 1 1,57 1 ,o 1,1 0,9 5,3 5,48 15 14,57 12 1,4 1 ,o 6,4 6,62 18 17,57 1,6 1,8 1,4 64 8,62 24 23,48 2 22 1,8 10,5 1
11、0,77 30 29,48 2,5 2,7 2.3 13 13,27 37 36,38 3 3,3 2,7 I 17 I 17,27 I 50 I 49.38 I 3 I 3.3 I 2.7 I Nominal size Nominal size Nominal I- -I Figure l: Washer dimensions (notation) Table 1: Washer dimensions 4 Material Washers shall be made of polyamide 6.6 (natural coiour). 5 Tolerances Washers shall b
12、e manufactured to the tolerances specified in DIN EN IS0 4759-3, with limit deviations and geometrical tolerances complying with the specifications for product grade C in the same standard. 6 Mechanical and physical properties Washers shall have the mechanical and physical properties specified in ta
13、ble 2 for guidance. NOTE: Since the properties set out in table 2, in particular the tensile strength, are subject to the prevailing ambient conditions, verification of compliance with the requirements by testing is recommended. Page 3 DIN 3481 6 : 1999-09 D rY Table 2: Mechanical and physical prope
14、rties Wet 50 Elongation at break, as a percentage (testing as in DIN EN IS0 527-1) 3 200 Modulus of elasticity, in N/mm2 (testing as in DIN EN IS0 527-1) Approximate density, in g/cm3 (testing as in DIN 53479) 200 1 400 = 1,14 Permanent Max. Temporary Max. Service temperature, in “C I I 90 130 I 60
15、to 65 I Yield stress, in N/mm2 Dielectric strength, in kV/mm 20 Charpy impact strength, in kJ/m2 (testing as in DIN EN IS0 179) 6 18 I I Ball indentation hardness, in N/mm2 (testing as in DIN EN IS0 2039-1) 75 to 85 Volume resistivity, in Qcm (testing as in IEC 93) I Dielectric loss factor, tan 6, a
16、t 106 Hz (testing as in DIN 53483-2) 0,Ol to 0,02 7 Designation Designation of a washer, large series, of nominal size 8 mm, made of polyamide 6.6 (PA6.6) of natural colour (nt): Washer DIN 34816 - 8 - PA6.6 - nt The DIN 4000 - 3 - 3.1 tabular layout of article characteristics shall apply to washers covered in this standard.
