Gauge for metric tapered threads. Tolerances

GOST 2533-88Group G28

INTERSTATE STANDARD CALIBERS FOR CYLINDRICAL PIPE THREAD Approvals Gauges for straight pipe thread. Tolerances

MKS 17.040.30OKP 39 3154

Date of introduction 1989-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated April 27, 1988 N 1167

3. The standard fully complies with ST SEV 354-87.

4. INSTEAD GOST 2533-79

6. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. REISSUE

This standard applies to threaded and smooth gauges for monitoring cylindrical pipe threads in accordance with GOST 6357 and establishes the types of gauges, thread profile, length of the working part, tolerances and formulas for determining the sizes of threaded and smooth gauges.

TYPES OF CALIBERS

1. TYPES OF CALIBERS

1.1. Gauges for monitoring tapered threads must be manufactured in the following types:

gauges for tapered external threads:

1 - threaded conical ring gauge (Fig. 3);

2 - threaded conical control plug gauge for a threaded conical ring gauge (Fig. 7);

3 - smooth conical ring gauge (Fig. 4);

4 - smooth conical control plug gauge for a smooth conical ring gauge (Fig. 8);

gauges for tapered internal threads:

5 — threaded conical plug gauge (Fig. 5);

6 - smooth conical plug gauge (Fig. 6).

1.2. Gauges for checking conical threads of types 1, 3, 5 and 6 must be manufactured in the following versions:

1 - gauge (plug or ring) with a reference plane corresponding to the nominal position of the main plane of the tapered thread.

2 - gauge (plug or ring) with control planes corresponding to the nominal positions of the main plane of the conical thread and with planes corresponding to the largest and smallest limiting dimensions of the axial displacement of the main plane. Execution 2 is preferred.

1.3. Gauges for monitoring conical external and cylindrical internal threads intended for mutual screwing must be made of the following types: gauges for conical external threads connected to internal cylindrical threads:

7 — threaded ring gauge (Fig. 9);

8 — threaded conical control plug gauge (Fig. 10); gauge for cylindrical internal threads connected to tapered external threads:

9 - threaded conical plug gauge (Fig. 10). Note. Instead of type 9 gauge, it is allowed to use PR and NOT plug gauges in accordance with GOST 24997 to control cylindrical internal threads.

1.4. The caliber designation must consist of the type of caliber and the designation of the thread and the designation of this standard. Examples of symbols for each type of caliber are given in Appendix 2.

2 Normative references

This standard uses references to the following interstate standards:

GOST 2016-86 Threaded gauges. Technical conditions GOST 4608-81 Basic standards of interchangeability. Metric thread. Interference fitsGOST 8724-2002 (ISO 261-98) Basic standards of interchangeability. Metric thread. Diameters and pitchesGOST 9150-2002 (ISO 68-1-98) Basic standards of interchangeability. Metric thread. ProfileGOST 11709-81 Basic standards of interchangeability. Metric thread for parts made of plasticGOST 16093-2004 Basic norms of interchangeability. Metric thread. Tolerances. Landings with clearanceGOST 16967-81 Basic norms of interchangeability. Metric thread for instrument making. Diameters and pitches GOST 24705-2004 Basic norms of interchangeability. Metric thread. Basic dimensionsGOST 24706-81 Basic standards of interchangeability. Metric thread for instrument making. Basic dimensions GOST 24834-81 Basic standards of interchangeability. Metric thread. Transitional fits GOST 24939-81 Calibers for cylindrical threads. Kinds

Note - When using this standard, it is advisable to check the validity of the reference standards using the “National Standards” index compiled as of January 1 of the current year, and according to the corresponding information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replaced (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

NOTATION

This standard establishes the following designations:

PROFILE AND LENGTH OF THE WORKING PART OF CALIBERS

3.1. Plug gauges of types 2, 5, 8 and 9 must have a profile in accordance with Figure 1, ring gauge of type 1 - in accordance with Figure 2.

Damn.1. Plug gauges types 2, 5, 8 and 9

Damn.1

Damn.2. Type 1 ring gauge

Damn.2

The profiles must be made with radii (gauge-ring) and (gauge-plug), which mate tangentially with the straight part of the profile, or with grooves and respectively. The shape of the grooves is arbitrary. Dimensions , , and should not be more than those indicated in Table 1.

Table 1

mm

The type 7 ring gauge must have the full profile of the PR ring gauge in accordance with GOST 24497*. _______________ *Probably an error in the original. You should read GOST 24997.

3.2. The lengths of the working part of the calibers must correspond to those indicated in Figures 3-10 and in Tables 2 and 3.

Damn.3. Threaded cone ring gauges. View 1

Threaded cone ring gauges

View 1

Damn.3

Damn.4. Smooth conical ring gauges. View 3

Smooth conical ring gauges
View 3
Figure 4

Damn.5. Threaded cone plug gauges. View 5

Threaded conical plug gauges
View 5
Figure

Damn.6. Smooth conical plug gauges. View 6

Smooth conical plug gauges
View 6
Figure 6

Damn.7. Threaded conical control plug gauge. View 2

Threaded conical control plug gauge
View 2
Fig.7

Damn.8. Smooth conical control plug gauge. View 4

Smooth conical control plug gauge
View 4
Fig.8

Damn.9. Threaded ring gauge. View 7

Threaded ring gauge
View 7
Figure 9

Damn 10. Threaded cone plug gauges Types 8, 9

Threaded cone plug gauges
Types 8, 9
Drawing 10

table 2

Note. For caliber type 8, the size is not regulated (see Appendix 1, paragraph 7).

Table 3

mm

________________ * Corresponds to a tolerance field of 6H, converted to axial displacement.

Appendix A (reference)

Calculation of the dimensions of the elements of the actual thread profile of thread gauges

A.1 Dimensions, mm, and , mm, of the actual thread profile of gauges PR (1), PR (4), PR (7), NE (9), NE (11), NE (14), PR (26) and PR (27) is calculated using the formula

; ,

where is the outer diameter of the thread gauges, mm;

— average diameter of thread gauges, mm.

NOTE Values ​​are calculated in accordance with A.5. calculated using the formulas given in tables 10 and 12.

A.2 Values ​​of dimensions and actual thread profile of gauges KPR-PR (2), U-PR (8), KNE-PR (12), KNE-NE (13), KPR-PR (28), KPR-NE (29 ), K-I (30), U-SR (31), U-SR (32) and U-SR (33) - according to Table 1.

A.3 Dimensions, mm, and , mm, of the actual thread profile of gauges KPR-NE (3), U-PR (5), K-I (6), U-NE (10), U-NE (15), KI-NE (16), PR (21), NE (22), PR (34), SR (35), SR (36) and SR (37) are calculated by the formula

; ,

where is the average diameter of thread gauges, mm;

— internal diameter of thread gauges, mm.

Note - calculated using the formulas given in tables 10-13; calculated in accordance with A.6.

A.4 If the values ​​of , , and are less than or equal to zero, then the gauge can be manufactured with the smallest achievable groove.

Note - Dimensions , , and are initial for the design of a thread-forming tool and are not subject to mandatory control.

A.5 To calculate the outer diameter of the gauge thread (Figures 2 and 4), the value should be subtracted from the values ​​of the outer diameter along the radii calculated using the formulas in Tables 10 and 12.

A.6 To calculate the internal diameter of the gauge thread (Figures 1 and 3), the value should be added to the values ​​of the internal diameter along the radii calculated using the formulas in tables 10-13.

TOLERANCES OF THREAD GAUGES

4.1. The location of the tolerance fields for the average thread diameter of the gauges for controlling external threads must correspond to those indicated in Figure 11, for controlling internal threads - in Figure 12.

Damn 11. Location of tolerance fields for the average thread diameter of gauges for checking external threads

Damn.11

Damn.12. Location of tolerance fields for the average thread diameter of gauges for checking internal threads

Damn.12

Note. The numbers next to the tolerance fields indicate the types of calibers.

4.2. Tolerances and values ​​that determine the position of tolerance fields and wear limits must correspond to those indicated in Table 4.

Table 4

Dimensions in microns

Note. and is determined by recalculating the axial displacement tolerances of the main plane of the thread (external and internal) 2 and 2.

4.3. The tolerance of the angle of inclination of the side of the thread of the gauges must correspond to:

Note. The position of the tolerance field is symmetrical relative to the nominal angle of inclination of the thread flank ().

4.4. The thread pitch tolerance of the gauges must correspond to:

Notes: 1. Pitch tolerance values ​​refer to the distances between any threads of the gauge.

2. The actual deviation can have a minus or plus sign.

4.5. The cone deviation, including the deviation of the cone angle, the deviation from the straightness of the generatrix (line of the average diameter) and the deviation from roundness in any section must be within the tolerance zone of the average diameter of the gauge thread. The tolerance zone for the average diameter of the gauge thread is indicated in Fig. 13.

Damn 13. Tolerance zone of average diameter of gauge thread

Damn.13

4.6. The maximum deviations for the coincidence of the control plane of type 1 gauge with the control plane of type 2 control gauge and the plane of type 7 caliber with the control plane of type 8 control gauge should not exceed those indicated in Table 5.

Table 5

mm

(Changed edition, Amendment No. 2).

*Size for reference.

Official publication ★

Reproduction is prohibited

Continuation

Continuation

P

14748.

Note. Use of handles is allowed

version 2 according to GOST

An example of a symbol for a double-sided plug for monitoring a threaded hole with a right-hand thread M10x 1.25 with a tolerance range of 6H:

CALCULATION OF THREAD GAUGES

The dimensions of the outer, middle and inner diameters of the thread of the gauges must be determined according to the formulas indicated in Table 6.

Table 6

Note. The dimensions and maximum deviations of the average diameter of ring gauges of types 1 and 7 are indicated to coordinate the tolerance fields of control gauges and control them with universal measuring instruments.

7 Formulas for calculating the maximum sizes of calibers

7.1 The dimensions of the thread diameters of gauges for monitoring external threads according to GOST 4608 (without sorting into groups), GOST 11709, GOST 16093 and GOST 24834 should be determined according to the formulas given in Table 10, for internal threads - in Table 11.

Table 10

Table 11

7.2 The dimensions of the thread diameters of gauges for checking external threads in accordance with GOST 4608, sorted into groups, must be determined according to the formulas given in Table 12, for internal threads - in Table 13.

Table 12

Table 13

7.3 The dimensions of the diameters of smooth gauges for monitoring the outer diameter of the external thread should be determined according to the formulas given in Table 14, for monitoring the internal diameter of the internal thread - in Table 15.

Table 14

Table 15

TOLERANCES FOR SMOOTH CALIBERS

6.1. The location of the tolerance fields of the gauges for monitoring the outer diameter of the external thread must correspond to that indicated in Figure 14, for monitoring the internal diameter of the internal thread - in Figure 15.

Damn.14. Location of tolerance fields of gauges for controlling the outer diameter of an external thread

Damn.14

Damn.15. Location of tolerance fields of gauges for monitoring the internal diameter of the internal thread

Damn.15

6.2. Tolerances and values ​​that determine the position of tolerance fields and wear limits must correspond to those indicated in Table 7.

Table 7

µm

6.3. The cone deviation, including the cone angle deviation, the generatrix deviation from straightness and the deviation from roundness in any section, must be within the tolerance zone of the corresponding diameter in the main plane.

6.4. The maximum deviations in the coincidence of the control plane of type 3 caliber with the control plane of type 4 control caliber should not exceed ±0.056 mm for a new caliber and +0.296 mm for an extremely worn one.

CALCULATION OF SMOOTH CONE GAUGES

The dimensions in the main plane of smooth conical gauges should be determined according to the formulas indicated in Table 8.

Table 8

Note. The size and maximum deviations of the internal diameter of the type 3 ring gauge are indicated to coordinate the tolerance fields of the control gauge and control them by universal means.

APPENDIX 1 (mandatory). RULES FOR APPLICATION OF CALIBERS

APPENDIX 1 Mandatory

1. Threaded cone gauges of types 1 and 5 to control the displacement of the main plane of the conical thread. When screwing together a threaded cone gauge in version 1 with a conical thread, its control plane must coincide with the end of the product. The permissible deviation should not exceed those specified in Table 2 of GOST 25229. When screwing a threaded cone gauge in version 2 with a product, the end of the product must be between the control planes of the gauge or coincide with one of them. When using calibers as receiving gauges (at the consumer of products), discrepancies between the end of the products and the control plane of calibers in version 1 are allowed by ±1.5. For calibers in version 2, the end of the product is allowed to extend beyond the ledges of the caliber by 0.5.

2. Smooth cone gauges of types 3 and 6 to control the deviations of the cut of the tips of the conical thread. Smooth cone gauges are used only in combination with threaded cone gauges. In this case, the position of the same control planes of the threaded conical and smooth conical gauges in relation to the end of the product must coincide. The permissible deviation from the coincidence of the same control planes of threaded and smooth conical gauges should not exceed ±1 mm.

3. Threaded conical control plug gauge of type 2 for monitoring a threaded conical ring gauge of type 1. When screwing the control gauge with the ring gauge, their control planes must coincide. Limit deviations from coincidence should not exceed the values ​​​​specified in Table 5 of this standard.

4. Smooth conical control plug gauge of type 4 to control a smooth conical ring gauge of type 3. The control gauge must fit into the ring gauge, and their control planes must coincide. The maximum deviations from coincidence are specified in clause 6.4 of this standard.

5. Thread ring gauge type 7 to control the displacement of the main plane of a conical external thread intended for screwing with a cylindrical internal thread. When screwing a type 7 ring gauge with a product, the end of the product must be between the control planes of the gauge or coincide with one of them.

6. Threaded conical plug gauge type 9 for monitoring the average diameter of a cylindrical thread intended for screwing with a tapered external thread. When screwing a type 9 plug gauge with a product, the end of the product must be between the control planes of the gauge or coincide with one of them.

7. Threaded conical control plug gauge of type 8 for monitoring the threaded ring gauge of type 7. The plane of the ring gauge of type 7 must coincide with the control plane (coinciding with the main plane) of the control gauge of type 8.

8. Limit deviations from coincidence are indicated in Table 5 of this standard.

GAUGES FOR CYLINDRICAL THREADS

Kinds

Gauges for parallel threads.
Types GOST

24939-81

MKS 17.040.30 OKI 39 3100

Date of introduction 01/01/82

1. This standard applies to threaded and smooth gauges for monitoring cylindrical threads with tolerances in accordance with GOST 4608 GOST 6357 GOST 9562 GOST 13535 GOST 16093 GOST 24739 GOST 24834 GOST 25096 and ST SEV 3962 and establishes the names of types of gauges and their designations.

This standard does not apply to gauges of types 3.6, 11 and 22 for thread control in accordance with GOST 24739 in terms of the rules for their use.

The standard fully complies with ST SEV 1921.