1、UDC 621.882.443 DEUTSCHE NORM April 1990 I I i Square taper washers I 6918 I I for high-strength structural bolting of steel channel sections Scheiben, vierkant, keilfrmig, fr HV-Schrauben an U-Profilen in Stahlkonstruktionen Supersedes February 1990 edition. In keeping with current practice in stan
2、dards published by the International Organization for Standardization (/SO), a comma has been used throughout as the decimal marker. Dimensions in mm 1 Scope and field of application Washers as specified in this standard are intended for use in GV and SL structural bolting of steel channel sections
3、in accordance with DIN 18800 Part 1, together with DIN6914 bolts and DIN6915 nuts. i 2 Dimensions u 1 Symbol HV (on bottom side) V Space for manufacturers symbol (on bottom side) / / Rolled-in grooves for indication of taper (on top side) i) Washers with an (8 IO,5)% taper shall be identified by two
4、 rooled-in grooves; those with (5f0,5) Yo taper need not have grooves, but the letter A shall be added to the designation. Continued on pages 2 and 3 I DIN 6978 Engl. Price group 5 Beuth Verlag GmbH. Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 02.91 Sales NO. 0105 Page
5、 2 DIN 6918 IV NI N L 11 X E c E .- s x E x E c ._ E .o x ? E E .- m x E u- DIN 6918 Page 3 3 Technical delivery conditions 3.1 Material Washers shall be made of steel as specified in DIN 17 200, quenched and tempered to a hardness from 295 to 350 HV 10 (e.g. C 45 steel). 3.2 Surface finish Washers
6、shall have a bright surface finish, be free from burr, and be hot-dip galvanized as specified in DIN 267 Part IO. 3.3 Acceptance inspection Acceptance inspection shall be undertaken on the lines of DIN267 Part. The acceptable quality level, APL. for the major characteristics shall be as specified in
7、 table 2. Table 2. Major characteristic APL value Hole diameter, d Coaxiality Taper angle 4 Designation Designation of a nominal size 21 washer for use with steel channel sections: Washer DIN 6918 - 21 Designation of a nominal size 28 washer with a 5% taper (A), for use with steel channel sections:
8、Washer DIN 6918 - 28 A 5 Marking Washers shall be marked on their bottom side with the manufacturers symbol and symbol HV Standards referred to DIN DIN DIN 6914 DIN 6915 DIN 17 200 DIN 18 800 Part 1 267 Part 5 267 Part 10 Fasteners: technical delivery conditions: hot-dip galvanized components Fasten
9、ers; technical delivery conditions; acceptance inspection (modified version of IS0 3269,1984 edition) High-strength hexagon head bolts with large widths across flats for structural steel bolting High-strength hexagon nuts with large widths across flats for structural steel bolting Steels for quenchi
10、ng and tempering; technical delivery conditions Steel structures; design and construction Previous editions DIN 6918: 08.62, 12.70, 03.79, 02.90. Amend men ts The following amendments have been made to the March 1979 edition. a) Limits of size are now specified. b) Use of materials as specified in D
11、IN 17 200 that are equivalent with C 45 steel is now permitted. c) Washers are now to be quenched and tempered, as opposed to hardened (as specified before) d) Washers are now to be hot dip galvanized as specified in DIN 267 Part 10. e) Washers are now to be subjected to acceptance inspection as specified in DIN 267 Part 5. 9 A specificaiion regarding marking with the manufacturers symbol has been included. g) Washers with a 5% taper are now to be identified in a way other than before. h) The standard has been editorially revised. International Patent Classification E 04 B 1 /38 F16B43/00
