GOST 2.311 68 ESKD image of the thread. Unified system of design documentation

GOST 2.311-68

Group T52

INTERSTATE STANDARD

Unified system of design documentation

IMAGE OF THREAD

Unified system for design documentation. Image of screw

ISS 01.100.20

Date of introduction 1971-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated May 28, 1968 N 755

3. The standard corresponds to ST SEV 284-76

4. INSTEAD GOST 3459-59

5. EDITION (August 2007) with Amendment No. 1, approved in April 1987 (IUS 7-87)

1. This standard establishes the rules for depicting and applying thread designations on drawings of all industries and construction.

The standard corresponds to ST SEV 284-76.

2. The carving is depicted:

a) on the rod - with solid main lines along the outer diameter of the thread and solid thin lines - along the inner diameter.

In images obtained by projection onto a plane parallel to the axis of the rod, a continuous thin line along the internal diameter of the thread is drawn along the entire length of the thread without a runoff, and in views obtained by projection onto a plane perpendicular to the axis of the rod, an arc is drawn along the internal diameter of the thread, approximately equal to a circle open anywhere (Fig. 1, 2);

Damn.1

Damn.2

b) in the hole - with solid main lines along the internal diameter of the thread and solid thin lines - along the outer diameter.

On sections parallel to the axis of the hole, a continuous thin line along the outer diameter of the thread is drawn along the entire length of the thread without running, and on images obtained by projection onto a plane perpendicular to the axis of the hole, an arc is drawn along the outer diameter of the thread, approximately equal to a circle, open at any place (Fig. 3, 4).

Damn.3

Damn.4

When depicting a thread, a solid thin line is applied at a distance of at least 0.8 mm from the main line and no more than the thread pitch.

3. The thread, shown as invisible, is depicted with dashed lines of the same thickness along the outer and inner diameters (Fig. 5).

Damn.5

4. The line defining the thread boundary is drawn on the rod and in the threaded hole at the end of the full thread profile (before the start of the run). The thread boundary is drawn to the line of the outer diameter of the thread and is depicted as a solid main or dashed line if the thread is depicted as invisible (Fig. 6-8).

Damn.7

Damn.8

5. Hatching in sections and sections is carried out to the line of the outer diameter of the thread on the rods and to the line of the internal diameter in the hole, i.e. in both cases to a solid main line (see drawings 3, 4, 7, 8).

6. The size of the thread length with a full profile (without run-out) on the rod and in the hole is indicated as shown in Figure 9 A and 10 A.

The size of the thread length (with run-out) is indicated as shown in Fig. 9 b and 10 b.

If it is necessary to indicate the amount of run-off on the rod, the dimensions are applied as shown in Fig. 9 V.

The thread run-out is depicted as a solid thin straight line, as shown in Fig. 9 b, V and 10 b.

Damn.9

Damn.10

An undercut of a thread made all the way is shown as shown in Fig. 11 A And V.

It is allowed to depict an undercut of the thread, as shown in Fig. 11 b And G.

7. The main plane of the conical thread on the rod, if necessary, is indicated by a thin solid line, as shown in Figure 12.

Damn.12

8. In drawings in which threads are not made, the end of a blind threaded hole may be depicted as shown in Figures 13 and 14, even if there is a difference between the depth of the thread hole and the length of the thread.

Damn.13

Damn.14

9. Chamfers on a threaded rod and in a threaded hole that do not have a special structural purpose are not shown in projection onto a plane perpendicular to the axis of the rod or hole (Fig. 15-17). A solid thin line depicting the thread on the rod should intersect the chamfer boundary line (see Fig. 15).

Damn.15

Damn.16

Damn.17

10. A thread with a non-standard profile is shown in one of the ways shown in Figure 18, with all the necessary dimensions and maximum deviations. In addition to the dimensions and maximum deviations of the thread, the drawing indicates additional data on the number of starts, the left direction of the thread, etc. with the addition of the word "Carving".

11. On the sections of a threaded connection in the image on a plane parallel to its axis, only the part of the thread that is not covered by the thread of the rod is shown in the hole (Fig. 19, 20).

Damn.19

Damn.20

12. Thread designations indicate, according to the relevant standards, the dimensions and maximum deviations of the threads and relate them for all threads, except conical and cylindrical pipe threads, to the outer diameter, as shown in Fig. 21, 22.

Damn.21

Damn.22

Designations for conical threads and cylindrical pipe threads are applied as shown in Fig. 23.

Damn.23

Note. The "*" sign marks the location where the thread designation is applied.

13. Special threads with a standard profile are abbreviated as Sp and a thread symbol.

(Changed edition, Amendment No. 1).

Electronic document text
prepared by Kodeks JSC and verified against:
official publication
Unified system of design documentation:
Sat. GOST. - M.: Standartinform, 2007

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GOST 2.311-68

INTERSTATE STANDARD

UNIFIED SYSTEM OF DESIGN DOCUMENTATION

IMAGE OF THREAD

IPC PUBLISHING HOUSE OF STANDARDS

Moscow

INTERSTATE STANDARD

Unified system of design documentation

IMAGETHREADS

Unified system for design documentation.
Image of screw

GOST
2.311-68

Date of introduction 01.01.71

1. This standard establishes the rules for depicting and applying thread designations on drawings of all industries and construction.

The standard corresponds to ST SEV 284-76.

2. The carving is depicted:

a) on the rod - with solid main lines along the outer diameter of the thread and solid thin lines - along the inner diameter.

In images obtained by projection onto a plane parallel to the axis of the rod, a continuous thin line along the internal diameter of the thread is drawn along the entire length of the thread without a runoff, and in views obtained by projection onto a plane perpendicular to the axis of the rod, an arc is drawn along the internal diameter of the thread, approximately equal to 3/4 of a circle, open anywhere (Fig. , );

Crap. 1

Crap. 2

b) in the hole - with solid main lines along the internal diameter of the thread and solid thin lines - along the outer diameter.

On sections parallel to the axis of the hole, a continuous thin line along the outer diameter of the thread is drawn along the entire length of the thread without running, and on images obtained by projection onto a plane perpendicular to the axis of the hole, an arc approximately equal to 3/4 of the circle is drawn along the outer diameter of the thread, open anywhere (damn. , ).

Crap. 3

Crap. 4

When depicting a thread, a solid thin line is applied at a distance of at least 0.8 mm from the main line and no more than the thread pitch.

3. A thread shown as invisible is depicted with dashed lines of the same thickness along the outer and inner diameters (Fig. ).

Crap. 5

4. The line defining the thread boundary is drawn on the rod and in the threaded hole at the end of the full thread profile (before the start of the run). The thread boundary is drawn to the line of the outer diameter of the thread and is depicted as a solid main line or a dashed line if the thread is depicted as invisible (drawing -).

Crap. 6

Crap. 7

Crap. 8

6. The length of the thread with a full profile (without run-out) on the rod and in the hole is indicated as shown in Fig. A and damn. A.

The thread length (with run-out) is indicated as shown in Fig. b and damn. b.

If it is necessary to indicate the amount of run-off on the rod, the dimensions are applied as shown in Fig. V.

The run of the thread is depicted as a solid thin straight line, as shown in Fig. b, V and damn. b.

Crap. 9

Crap. 10

An undercut of a thread made all the way is depicted as shown in Fig. A And V.

It is allowed to depict an undercut of the thread, as shown in Fig. b And G.

Crap. eleven

(Changed edition, Amendment No. 1).

7. The main plane of the conical thread on the rod, if necessary, is indicated by a thin solid line, as shown in Fig. .

Crap. 12

8. In drawings in which threads are not made, the end of a blind threaded hole may be depicted as shown in Fig. and, even if there is a difference between the depth of the thread hole and the length of the thread.

Crap. 13

Crap. 14

9. Chamfers on a threaded rod and in a threaded hole that do not have a special structural purpose are not shown in projection onto a plane perpendicular to the axis of the rod or hole (Fig. -). A solid thin line depicting the thread on the rod should intersect the chamfer boundary line (see drawing).

Crap. 15

Crap. 16

Crap. 17

10. A thread with a non-standard profile is shown in one of the ways shown in Fig. , with all necessary dimensions and maximum deviations. In addition to the dimensions and maximum deviations of the thread, the drawing indicates additional data on the number of starts, the left direction of the thread, etc. with the addition of the word "Carving".

Constructing a helical surface in a drawing is a long and complex process, therefore, in product drawings, threads are depicted conditionally, in accordance with GOST 2.311–68. The helix line is replaced by two lines - a solid main line and a solid thin line.

Threads are divided according to their location on the surface of the part into external and internal.

Conventional image of the thread on the rod.

Fig.7

The external thread on the rod (Fig. 7) is depicted by solid main lines along the outer diameter and solid thin lines along the internal diameter, and in images obtained by projection onto a plane perpendicular to the axis of the rod, a thin line is drawn at 3/4 of the circle, and this line can be open anywhere (it is not allowed to start a continuous thin line and end it on the center line). The distance between the thin line and the solid main line should not be less than 0.8 mm and greater than the thread pitch, and the chamfer is not shown in this view. The thread boundary is applied at the end of the full thread profile (before the start of the run) with a solid main line, if it is visible. If necessary, the thread run-out is depicted as a solid thin line.

Fig.8

For technological reasons, a part of the part (rod) may be under-threaded. In total, the undercut of the thread and the run-out represent an undercut of the thread (GOST 10548–80). The thread length is indicated, as a rule, without runoff.

Conventional image of a thread in a hole

Fig.9

Internal thread – is depicted by a solid main line along the inner diameter and a solid thin line along the outer diameter. If, when depicting a blind hole, the end of the thread is located close to its bottom, then it is allowed to depict the thread to the end of the hole. Threads with a non-standard profile should be depicted.

Conventional image of the assembled thread.

Fig.10

Sections of a threaded connection in the image on a plane parallel to its axis in the hole show only that part of the thread that is not covered by the thread of the rod.

Hatching in sections and sections is carried out to a solid main line, i.e. to the outer diameter of the male thread and the internal diameter of the female thread.

Table 4. Conventional image of threads

To designate threads, standards for individual types of threads are used. For all threads, except conical and cylindrical pipe threads, the designations refer to the outer diameter and are placed above the dimension line, on its extension or on the shelf of the leader line. The designations of conical threads and cylindrical pipe threads are applied only on the shelf of the leader line.

The threads in the drawing are conventionally designated in accordance with the standards for the image, diameters, pitches, etc.

Metric threads are designated in accordance with GOST 9150–81.

Metric thread is divided into threads with a large pitch, designated by the letter M indicating the nominal diameter of the cylindrical surface on which the thread is made, for example M12, and a thread with a fine pitch, indicated by indicating the nominal diameter, thread pitch and tolerance range, for example M24´2–6g or M12´1–6N.

When designating a left-hand thread, put LH after the symbol.

Multi-start threads are designated, for example, three-start, M24´З(P1)LH, where M– thread type, 24 – nominal diameter, 3 – thread stroke, P 1 – thread pitch. The given designations for left-handed and multi-start threads can be applied to all metric threads.

Metric tapered thread designated in accordance with GOST 25229–82. The thread designation includes the letters MK. Connections of internal cylindrical threads with external conical threads are used. The dimensions of the profile elements of conical and cylindrical threads are taken according to GOST 9150–81. A connection of this type must ensure screwing in a conical thread to a depth of at least 0.8 l(Where l– thread length without run). The designation of an internal cylindrical thread consists of the nominal diameter, pitch and standard number (for example: M20´1.5 GOST 25229–82).

Fig.11

The connection of an internal cylindrical thread with an external conical thread (Fig. 11) is designated by the fraction M/MK, nominal diameter, pitch and standard number: M/MK 20´1.5LH GOST 25229–82. If there are no special requirements for the tightness of connections of this kind or when seals are used to achieve tightness of such connections, the standard number in the designation of connections is omitted, for example: M/MK 20´1.5 LH.

The tolerance field of the average diameter of the internal cylindrical thread must correspond to 6N according to GOST 16093–81, and the maximum deviation of the internal diameter and cut of the cavities of the internal cylindrical thread is accepted within the following limits: upper limit deviation (+0.12) ... (+0.15), and the lower limit deviation is 0.

Pipe cylindrical thread. The thread symbol consists of the letter G, designation of thread size, accuracy class of average diameter ( A or IN). For left-hand threads, the designation LH is used. For example, G1 1 / 2 LH–B–40 make-up length, indicated if necessary.

The connection of an internal cylindrical pipe thread of accuracy class A with an external pipe conical thread according to GOST 6211–81 is designated as follows: for example, G/R p –1 1/2 –A.

When designating fits, the numerator indicates the accuracy class of the internal thread, and the denominator indicates the external thread. For example: G 1 1 / 2 –A/B.

Tapered pipe thread. The thread designation includes the following letters: R– for tapered external threads, R c – for tapered internal thread, R p – for cylindrical internal thread and designation of thread size. For left-hand threads, the letters LH are added. The nominal size of the thread, as well as its diameters measured in the main plane, correspond to the parameters of a cylindrical pipe thread having the same nominal size. Therefore, parts with conical pipe threads are often used in connections with parts with cylindrical pipe threads, which ensures a fairly high tightness of the connections. Threaded connections are designated as a fraction, the numerator of which indicates the letter designation of the internal thread, and the denominator - the external thread. Example notation:

Internal pipe cylindrical thread accuracy class A according to GOST 6357–81.

Trapezoidal thread. The symbol for trapezoidal thread consists of the letters Tr, nominal diameter, stroke R n and step R. For example: Tr20´4LH–8H, where LH is the designation of the left-hand thread, 8H is the main thread deviation.

If necessary, after the main thread deviation, the make-up length is indicated L(in mm). For example: Tg40´6–8g–85; 85 – make-up length.

The thread is persistent. The thread designation consists of the letter S, nominal diameter, pitch and main deviation S80´10–8Н.

For left-hand threads, the letters LH are indicated after the thread symbol.

For multi-start threads, enter the additional stroke value together with the letter R and step value. Thus, a double-start thread with a pitch of 10 mm is designated S80´2(P10).

Rectangular thread not standardized. When depicting a rectangular thread, it is recommended to draw a local section on which the required dimensions are marked.

Special threads. If a thread has a standard profile, but differs from the corresponding standard thread in diameter or pitch, then the thread is called special. In this case, the inscription is added to the thread designation Sp, and the thread designation indicates the dimensions of the outer diameter and thread pitch, for example: Sp.M19´1D. A thread with a non-standard profile is depicted as presented in paragraph 9 of Table 1, with the dimensions required for the manufacture of the thread.

Technological thread elements

Fig.12

Metric, single-stroke, trapezoidal, cylindrical pipe, conical pipe, inch conical threads with a profile angle of 60° have technological elements associated with the thread exit, which include: run-out, undercut, groove and chamfer.

Threaded chamfers. GOST 10549–80

The chamfers on rods and in threaded holes (except for metric threads) have the shape of a truncated cone with an apex angle of 90° and a height Z. Chamfers on metric external threads have an angle at the apex of the cone of 90° and a given diameter of the smaller base of the cone. Chamfers on metric internal threads have a cone apex angle of 120° and a given diameter of the larger base of the truncated cone. Chamfers are shown only on a projection parallel to the thread axis, or in a section by a plane passing through the thread axis. On a projection onto a plane perpendicular to the thread axis, the chamfer is not shown.

The shape and dimensions of chamfers for external metric threads and fasteners are established by GOST 12414–66 (ST SEV 215–82). The determining size is the outer diameter of the thread d. The shape and dimensions of chamfers for internal metric threads are established by GOST 10549–80. The determining size is the outer diameter of the thread D.

The shape and dimensions of chamfers for trapezoidal threads are established by GOST 10549–80. The determining size is the thread pitch R.

The shape and dimensions of chamfers for pipe conical threads and conical inch threads are established by GOST 10549–80. The determining parameter is the number of thread pitches over a length of 25.4 mm . The shape and dimensions of chamfers for cylindrical pipe threads are established by GOST 10549–80. The determining parameter is the number of thread pitches over a length of 25.4 mm .

Threaded grooves. GOST 10549–80

Fig.13

A groove (Fig. 13) is made at the end of the thread to exit the tool and obtain a full profile thread along the entire length of the rod or hole. In the drawings of the part, the groove is depicted in a simplified manner and the drawing is supplemented with an extension element on an enlarged scale. .

The shape and dimensions of external thread grooves (when making threads by cutting) are established by GOST 10549–80 (ST SEV 214–75). The determining size is the thread pitch R.

The shape and dimensions of grooves for internal metric threads are established by GOST 10549–80. The determining size is the thread pitch R.

The shape and dimensions of grooves for trapezoidal threads are established by GOST 10549–80. The determining size is the thread pitch R.

The shape and dimensions of grooves for pipe conical threads and conical inch threads are established by GOST 10549–80. The determining parameter is the number of thread pitches over a length of 25.4 mm .

The shape and dimensions of grooves for cylindrical pipe threads are established by GOST 10549–80. The determining parameter is the number of thread pitches over a length of 25.4 mm .

GOST 2.311-68

INTERSTATE STANDARD

UNIFIED SYSTEM OF DESIGN DOCUMENTATION

IMAGE OF THREAD

Official publication

Standardinform

M ENGINEERING STATE STANDARD

Unified system of design documentation

IMAGE OF THREAD

Unified system for design documentation.

ISS 01.100.20

Date of introduction 01/01/71

1. This standard establishes the rules for depicting and applying thread designations on drawings of all industries and construction.

The standard corresponds to ST SEV 284-76.

2. The carving is depicted:

a) on the rod - with solid main lines along the outer diameter of the thread and solid thin lines - along the inner diameter.

b) in the hole - with solid main lines along the internal diameter of the thread and solid thin lines - along the outer diameter.

Official publication ★

Reproduction is prohibited

When depicting a thread, a solid thin line is applied at a distance of at least 0.8 mm from the main line and no more than the thread pitch.

3. The thread, shown as invisible, is depicted with dashed lines of the same thickness along the outer and inner diameters (Fig. 5).

4. A line defining the thread boundary is drawn on the rod and in the threaded hole at the end of the full thread profile (before the start

escape). The thread boundary is drawn to the line of the outer diameter of the thread and is depicted as a solid main or dashed line if the thread is depicted as invisible (Fig. 6-8).

A-A

6. The length of the thread with a full profile (without run-out) on the rod and in the hole is indicated as shown in Fig. 9a and 10a.

The thread length (with run-out) is indicated as shown in Fig. 96 and 10b.

If it is necessary to indicate the amount of run-off on the rod, the dimensions are applied as shown in Fig. 9th century

The run of the thread is depicted as a solid thin straight line, as shown in Fig. 9b, c and 106.

An undercut of a thread made all the way is depicted as shown in Fig. Pies in. It is allowed to depict an undercut of the thread, as shown in Fig. 1\b and d.

7. The main plane of the conical thread on the rod, if necessary, is indicated by a thin solid line, as shown in Fig. 12.

8. In drawings in which threads are not made, the end of a blind threaded hole may be depicted as shown in Fig. 13 and 14, even if there is a difference between the depth of the thread hole and the length of the thread.

9. Chamfers on a threaded rod and in a threaded hole that do not have a special structural purpose are not shown in projection onto a plane perpendicular to the axis of the rod or hole (Fig. 15-17). A solid thin line of the thread image on the rod should intersect the chamfer boundary line (see Fig. 15).

10. A thread with a non-standard profile is shown in one of the ways shown in Fig. 18, with all necessary dimensions and maximum deviations. In addition to the dimensions and maximum deviations of the thread, the drawing indicates additional data on the number of starts, the left direction of the thread, etc. with the addition of the word "Carving".

11. On the sections of a threaded connection in the image on a plane parallel to its axis, only the part of the thread that is not covered by the thread of the rod is shown in the hole (Fig. 19, 20).

Designations for conical threads and cylindrical pipe threads are applied as shown in Fig. 23.

Note. The “*” sign marks the location where the thread designation is applied.

13. Special threads with a standard profile are abbreviated as C and the thread symbol.

(Changed edition, Amendment No. 1).

1. DEVELOPED AND INTRODUCED by the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated May 28, 1968 No. 755

3. The standard corresponds to ST SEV 284-76

4. INSTEAD GOST 3459-59

5. EDITION (August 2007) with Change No. 1, approved in April 1987 (IUS 7-87)

GOST 2.311-68

INTERSTATE STANDARD

UNIFIED SYSTEM OF DESIGN DOCUMENTATION

IMAGE OF THREAD

The standard corresponds to ST SEV 284-76.

2. The carving is depicted:

a) on the rod - with solid main lines along the outer diameter of the thread and solid thin lines - along the inner diameter.

b) in the hole - with solid main lines along the internal diameter of the thread and solid thin lines - along the outer diameter.

3. The thread, shown as invisible, is depicted with dashed lines of the same thickness along the outer and inner diameters (Fig. 5).

6. The length of the thread with a full profile (without run-out) on the rod and in the hole is indicated as shown in Fig. 9 A and damn. 10 A.

The thread length (with run-out) is indicated as shown in Fig. 9 b and damn. 10 b.

If it is necessary to indicate the amount of run-off on the rod, the dimensions are applied as shown in Fig. 9 V.

The run of the thread is depicted as a solid thin straight line, as shown in Fig. 9 b, V and damn. 10 b.

It is allowed to depict an undercut of the thread, as shown in Fig. eleven b And G.

7. The main plane of the conical thread on the rod, if necessary, is indicated by a thin solid line, as shown in Fig. 12.

9. Chamfers on a threaded rod and in a threaded hole that do not have a special structural purpose are not shown in projection onto a plane perpendicular to the axis of the rod or hole (Fig. 15-17). A solid thin line of the thread image on the rod should intersect the chamfer boundary line (see Fig. 15).

11. On sections of a threaded connection in the image on a plane parallel to its axis, only the part of the thread that is not covered by the thread of the rod is shown in the hole (Fig. 19, 20).

Designations for conical threads and cylindrical pipe threads are applied as shown in Fig. 23.

Note. The “*” sign marks the location where the thread designation is applied.

13. Special threads with a standard profile are abbreviated as Sp and a thread symbol.

(Changed edition, Amendment No. 1).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR

2. APPROVED AND ENTERED INTO EFFECT by the Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR in December 1967.

3. The standard corresponds to ST SEV 284-76

4. INSTEAD GOST 3459-59

5. EDITION (August 2007) with Change No. 1, approved in April 1987 (IUS 7-87)