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1、INTERNATIONAL STANDARD IS0 641 O-1 First edition 1993-05-l 5 Technical drawings - Screw threads and threaded parts - Part 1: General conventions Dessins techniques - Filetages et pikes filet in recognition of this fact, IS0 6410 is presented in three parts (see foreword). -,-,- INTERNATIONAL STANDAR
2、D IS0 6410-1:1993(E) Technical drawings - Screw threads and threaded parts - Part 1: General conventions 1 Scope This part of IS0 6410 specifies methods for rep- resenting screw threads and threaded parts on technical drawings. 2 Normative references The following standards contain provisions which,
3、 through reference in this text, constitute provisions of this part of IS0 6410. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 6410 are encouraged to investi- gate the possibility of applying
4、the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 128:1982, Technical drawings - General princi- ples of presentation. IS0 129:1985, Technical drawings - Dimensioning - General principles, definition
5、s, methods of execution and special indications. IS0 225:1983, Fasteners - Bolts, screws, studs and nuts - Symbols and designations of dimensions. IS0 4753:1983, Fasteners - Ends of parts with ex- ternal metric /SO thread. IS0 6410-3:1993, Technical drawings - Screw threads and threaded parts - Part
6、 3: Simplified rep- resentation. 3 Representation 3.1 Detailed representation of threads In certain types of technical product documentation (e.g. publications, user manuals, etc.) the detailed representation of a thread either in a side view or in a section (see figures 1 to 3 ) may be needed to il
7、- lustrate single or assembled parts. Neither pitch nor profile of the threads need usually be drawn exactly to scale. In technical drawings, the detailed representation of threads (see figures 1 to 3) should only be used if absolutely necessary and whenever possible the helix should be represented
8、by straight lines (see figure 2). L External thread L Internal thread Figure 1 1 -,-,- IS0 64104:1993(E) Figure 2 Figure 3 3.2 Conventional representation Normally, by convention, the representation of threads and threaded parts in all types of technical drawings is simplified as shown in figures 4
9、to 7. 3.2.1 Views and sections of screw threads For visible screw threads in side views and sections, the crestsI) of threads shall be defined by a continu- ous thick line (type A, IS0 128), and the roots*) of threads by a continuous thin line (type B, IS0 128), as shown in figures 4 to 13. The spac
10、e between the lines representing the crest and root of the thread should approximate as closely as possible the depth of the thread, but, in all cases, this spacing shall be not less than - twice the thickness of the thick line, or - 0,7 mm, whichever is the larger. NOTE 1 In certain cases, for exam
11、ple computer-aided draughting, - a distance of 1,5 mm for threads of nominal diameter d 8 mm is generally acceptable; - a simplified representation is recommended for threads of nominal diameter d d 6 mm, see IS0 6410-3. 3.2.2 End view of screw threads On an end view of a screw thread, the thread ro
12、ots shall be represented by a portion of a circle, drawn with a continuous thin line (type B, IS0 128) approx- imately equal to three-quarters of the circumference (see figures 4 and 5), preferably open in the right- hand upper quadrant. The thick line representing the chamfer circle is generally om
13、itted on the end view (see figures 4 and 5). NOTE 2 The portion of the circle may also have any other position relative to the intersecting axes (see figure 6). 3.2.3 Hidden screw threads Where it is necessary to show hidden screw threads, the crests ) and the roofs*) shall be represented by dashed
14、thin lines (type F, IS0 128), as shown in fig- ure 7. 3.2.4 Hatching of sections of threaded parts For threaded parts shown in section, hatching shall extend to the line defining the crests of the thread (see figures 5 to 8). 1) “Crest” normally refers to the major diameter for external threads and
15、to the minor diameter for internal threads. 2) “Root” normally refers to the minor diameter for external threads and to the major diameter for internal threads. 2 -,-,- IS0 6410-1:1993(E) Figure 4 Figure 5 Figure 6 3.2.5 Limit of length of full depth thread The limit of the length of full depth thre
16、ad - shall be shown, if visible, by a continuous thick line (type A, IS0 128) - may be shown, if hidden, by a dashed line (type F, IS0 128). These limit lines shall terminate at the lines defining the major diameter of the thread (see figures 4, 8 to 11 and 13). 3.2.6 Thread run-outs Thread run-outs
17、 are beyond the effective ends of the thread except for the end of studs. They shall be represented by a continuous inclined thin line (type B, IS0 128) if functionally necessary (see figure8) or for dimensioning (see figure 13). However it is allowed not to represent the run-out wherever possible (
18、see figures 4, 5 and 7). 3.3 Assembled threaded parts The conventions specified in 3.2 apply also to as- semblies of threaded parts. However, externally threaded parts shall always be shown covering internally threaded parts and shall not be hidden by them (see figures 8 and 10). The thick line rep-
19、 resenting the limit of the useful length of the internal screw thread shall be drawn to the root of the internal thread (see figures 8 and 9). 3 -,-,- IS0 6410-1:1993(E) Et i-37 i-y - - Figure 7 Figure 9 tu u Figure 8 Figure 10 -,-,- IS0 6410-1:1993(E) 4 Indication and dimensioning of threaded part
20、s 4.1 Designation The type of screw thread and its dimensions shall be indicated by means of the designation specified in the relevant International Standards for threads. When indicating the designation on technical drawings, the description block as well as the Inter- national Standard block shall
21、 be omitted. In general, the screw thread designation covers - the abbreviation of the kind of thread (standard- ized symbol, e.g. M, G, Tr, HA, etc.); - the nominal diameter or size (e.g. 20; l/2; 40; 4,5; etc.); and, if necessary, - the lead (L), in millimetres; - the pitch (P), in millimetres; -
22、the direction of lead (see 4.4); as well as additional indications, such as - the tolerance class according to the relevant International Standard; - thread engagement (S = short, L = long, N = normal): - the number of starts. EXAMPLES (taken from International Standards, see annex A) a) M20 x 2 - 6
23、G/6h - LH b) M20 x L3 - PI,5 - 6H - S c) G l/2 A d) Tr 40 x 7 e) HA 4,5 4.2 Dimensioning 4.2.1 The nominal diameter, d, always refers to the crestl) of the external thread (see figures 11 and 13 or the root2) of the internal thread (see figure 12). The dimension of the thread length normally refers
24、to the length of the full depth thread (see figure 11) unless the run-out is functionally necessary (e.g. studs) and therefore specifically drawn (see figures 8 and 13). NOTE 3 Ends of bolts (see IS0 4753) should be included in the length of full depth thread (b) or (I). All dimensions shall be indi
25、cated in accordance with IS0 129 and IS0 225 or in accordance with 4.3. 4.3 Thread length and blind hole depth It is generally necessary to dimension the length of thread but the blind hole depth may usually be omitted. The need for indicating the blind hole depth depends mostly on the part itself a
26、nd the tool used for threading. When the dimension of the hole depth is unspecified, it shall be depicted as being I,25 times that of the thread length (see figure14). A short designation as shown in figure 15 may also be used. 4.4 Indication of direction of lead Right-hand threads need not be denot
27、ed in general. Left-hand threads shall be denoted by adding the abbreviation LH to the thread designation. Right- hand and left-hand threads on the same part shall be denoted, in every case. Right-hand threads shall be denoted, if necessary, by adding the abbreviation “RH” to the thread designation.
28、 Figure 11 -,-,- lS0 6410-1:7993(E) Figure 12 Figure 13 Figure 14 Figure 15 6 -,-,- IS0 6410-1:1993(E) Annex A (informative) Bibliography I IS0 228-1:1982, Pipe threads where pressure- tight joints are not made on the threads - Part 1: Designation, dimensions and tolerances. 5 IS0 2902:1977, IS0 met
29、ric trapezoidal screw threads - Genera/ plan. S IS0 5835:1991, implants for surgery - Metal bone screws with hexagonal drive connection, 2 IS0 261:S), IS0 general-purpose metric screw spherical under-surface of head, asymmetrical threads - General plan. thread - Dimensions. 3 IS0 262:“), IS0 general
30、-purpose metric screw threads - Selected sizes for screws, bolts and nuts. 4 IS0 965-1:1980, IS0 general purpose metric screw threads - Tolerances - Part I: Princi- ples and basic data. 7 international guide to screw threads - Sym- bols, profiles and designations of threads in standards of various c
31、ountries, Beuth Verlag, Berlin. 3) To be published. (Revision of IS0 261:1973) 4) To be published. (Revision of IS0 262:1973) 7 -,-,- IS0 6410-1:1993(E) UDC 744.42:621.882.082 Descriptors: drawlngs, technical drawings, screw threads, threaded parts, graphic methods, generalities. Price based on 7 pages -,-,-