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Vernier caliper GOST 166 89 designation. Calipers. Technical conditions. Operating instructions

VERNIER CALIPS

TECHNICAL CONDITIONS

GOST 166-89

(ST SEV 704-77¸ ST SEV 707-77; ST SEV 1309-78, ISO 3599-76)

USSR STATE COMMITTEE FOR MANAGEMENT
PRODUCT QUALITY AND STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

Validity from 01.01.91

until 01/01/96

Failure to comply with the standard is punishable by law

This standard applies to calipers intended for measuring external and internal dimensions up to 2000 mm, as well as calipers special purpose for measuring grooves on external and internal surfaces, grooves, distances between the axes of small diameter holes and pipe walls.

The requirements of this standard are mandatory.

(Changed edition, Amendment No. 2).

1. TYPES. MAIN PARAMETERS AND DIMENSIONS

1.1 . Calipers should be made of the following main types:

I - double-sided with depth gauge (Fig. );

T-1 - one-sided with a depth gauge with measuring surfaces made of hard alloys (drawing);

II - double-sided (drawing) );

III - one-sided (Fig. ).

Note: It is allowed to equip calipers with devices or auxiliary measuring surfaces for expansion functionality(measurements of heights, ledges, etc.).

Notes:

1. The lower limit of measurement for calipers with an upper limit of up to 400 mm is set for measuring external dimensions.

2. For T-1 type calipers, the measuring range only applies to external dimensions and depth measurements.

3 The upper limit of measurement for type I and T-1 calipers should be no more than 300mm .

4. It is allowed to produce calipers with separate verniers or scales for measuring external and internal dimensions.

5. It is allowed to manufacture type III calipers with surfaces for measuring external dimensions from hard alloy (Hard alloy according to GOST 3882)

Example of a symboltype II caliper with a measuring range of 0 - 250 mm and a vernier reading value of 0.05 mm:

Caliper ShTs- II-250-0.05 GOST 166

The same, caliper type I I with a measuring range of 250 - 630 mm and a vernier reading value of 0.1 mm, accuracy class 1:

Caliper ShTs- II-250-630-0.1-1 GOST 166

The same, type I calipers with a measuring range of 0 - 150 mm with a dial division of 0.02 mm.

Vernier caliper ShTsK-1-150-0.02 GOST 166

The same, type I calipers with a measuring range of 0 - 125 mm with a discrete step of a digital reading device of 0.01 mm:

Vernier caliper ShTsTs-1-125-0.01 GOST 166

(Changed edition).

(Changed edition. Amendment No. 1).

(Changed edition).

Notes:

1. The nominal distance between the measuring surfaces of the jaws is taken as the measured length.

2. For calipers with one vernier, the error is checked using jaws for measuring external dimensions.

3. When moving the jaws of the calipers until they touch, the displacement of the zero stroke of the vernier is allowed only in the direction of increasing size.

4. The error of the caliper should not exceed the values specified in the table. at temperature (20 ± 10) ° C when checking them against plane-parallel gauge blocks made of steel.

2.5 . The tolerance for flatness and straightness of the measuring surfaces should be 0.01 mm per 100 mm of length larger side measuring surface of calipers.

In this case, the permissible deviations of flatness and straightness of the measuring surfaces should be:

0 .004 mm - for calipers with a reading value along the vernier, with a scale division value and a discrete step of no more than 0.05 mm and the length of the larger side of the measuring surface is less than 40 mm;

0 .007 mm - for calipers with a reading value along the vernier and with a scale division value of 0.1 mm and the length of the larger side of the measuring surface is less than 70 mm.

The straightness tolerance of the rod end of type I and T-1 calipers should be 0.01 mm.

Blockages are allowed along the edges of flat measuring surfaces in an area not exceeding 0.2 mm wide.

Note: The flatness requirements only apply to surfaces wider than 4 mm.

(Changed edition. Amendment No. 1, 2).

2.6 . The parallelism tolerance of the measuring surfaces of the jaws for measuring internal dimensions must be 0.010 mm over the entire length. For calipers of accuracy class 2, the measuring surfaces of the edge jaws can be manufactured with a parallelism tolerance of 0.02 mm.

Blockages are allowed in the area up to 0.5 mm from the top edge of the measuring surfaces.

The parallelism tolerance per 100 mm of the length of the flat measuring surfaces of the jaws for measuring external dimensions should be:

0 .02 mm - with a vernier reading value, scale division value and discrete step of no more than 0.05 mm;

0 .03 mm - with a reading value of the vernier and a scale division of 0.1 mm.

2.7 . The backlash of the micrometric pair of the device for fine installation of the frame should not exceed 1/3 of a turn.

2.8 . Deviations in the size of jaws with cylindrical measuring surfaces for measuring internal dimensions should not exceed: ( ) mm with a division value or vernier reading value of at least 0.05 mm; ( ) mm when the division value or discrete step is less than 0.05 mm.

2.9 . The frame should not move along the rod under its own weight when the caliper is in a vertical position.

Note: For calipers with a measuring range of 0 - 125, 0 - 135, 0 - 150 mm, the permissible values of the moving force are selected from the range 10, 15 N.

2.11 .Requirements for the rod and vernier scale.

2.11.1 The location of the vernier scale plane relative to the rod scale plane is indicated in Fig. .

Note: It is allowed to use other metallic and non-metallic coatings in accordance with GOST 9.303 and GOST 9.032, whose protective and decorative properties are not inferior to those indicated in the table. .

It is allowed for calipers with an upper measurement limit of over 1000 mm not to be chromed.

(Changed edition, Amendment No. 1).

2.18 . Calipers must be demagnetized.

2.19 - 2.24 (Excluded. Changes No. 1, 2).

2.25 .Completeness

2.25.1 . Each caliper must be accompanied by operational documentation for GOST 2.601.

2.25.2 . At the customer's request, type II and III calipers are equipped with a marking device.

2.26 .Marking

GOST 166-89
(ISO 3599-76)

Group P53

INTERSTATE STANDARD

VERNIER CALIPS

Specifications

Vernier callers. Specifications

ISS 17.040.30
OKP 39 3310

Date of introduction 1991-01-01

INFORMATION DATA

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

PERFORMERS

M.B.Shabalina, Ph.D. tech. Sciences (topic leader);

N.V. Semenova

2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR on product quality management and standards dated 10.30.89 N 3253

3. INSTEAD GOST 166-80

4. The standard fully complies with ST SEV 704-77 - ST SEV 707-77, ST SEV 1309-78, ISO 3599-76

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS


	Item number
GOST 2.601-95
GOST 8.001-80
GOST 8.113-85
GOST 8.383-80
GOST 9.014-78
GOST 9.032-74
GOST 9.303-84
GOST 27.410-87*
GOST 2789-73
GOST 3882-74
GOST 13762-86	2.26.3; 2.27.2; 5
MI 1384-86

________________
* In the territory Russian Federation the document is not valid. GOST R 27.403-2009 is in force. - .

6. The validity period was removed by Decree of the State Standard of October 12, 1992 N 1353

7. EDITION (August 2003) with Amendments No. 1, 2, approved in July 1990, October 1992 (IUS 11-90, 1-93)

This standard applies to calipers designed for measuring external and internal dimensions up to 2000 mm, as well as special-purpose calipers for measuring grooves on external and internal surfaces, grooves, distances between the axes of small diameter holes and pipe walls.

The requirements of this standard are mandatory.

1. TYPES, MAIN PARAMETERS AND DIMENSIONS

1.1. Calipers should be made of the following main types:

I - double-sided with a depth gauge (Fig. 1);

T-1 - single-sided with a depth gauge with measuring surfaces made of hard alloys (Fig. 2);

II - double-sided (Fig. 3);

III - one-sided (Fig. 4).

Note. It is allowed to equip calipers with devices or auxiliary measuring surfaces to expand functionality (measure heights, ledges, etc.).

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 6 - depth gauge; 7 - jaws with edge measuring surfaces for measuring internal dimensions; 8 9 - rod scale

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface rods; 6 - depth gauge; 7 - jaws with flat measuring surfaces for measuring external dimensions; 8 - rod scale

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface of the rod; 6 - device for fine frame adjustment; 7 - jaws with edge measuring surfaces for measuring external dimensions; 8 - jaws with flat and cylindrical measuring surfaces for measuring external and internal dimensions, respectively; 9 - rod scale

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface of the rod; 6 - jaws with flat measuring surfaces for measuring external dimensions; 7 - jaws with cylindrical measuring surfaces for measuring internal dimensions; 8 - rod scale

(Changed edition, Amendment No. 1).

1.2. Vernier calipers should be made with vernier reading (SD) (Fig. 1-4) or with circular scale reading (SCC) (Fig. 5), or with a digital reading device (DVR) (Fig. 6).

1 - circular scale of the reading device; 2 - rod; 3 - frame; 4 - rod scale

1 - digital reading device; 2 - rod; 3 - frame

Note. Figures 1-6 do not define the design of calipers.

1.3. The measurement range, the reading value of the vernier, the division value of the circular scale and the discrete step of the digital reading device of vernier calipers must correspond to those indicated in Table 1.

Table 1


Measuring range of calipers	Vernier reading value	Dividing value of the circular scale of the reading device	Discrete step of digital readout device















Notes: 1. The lower limit of measurement for calipers with an upper limit of up to 400 mm is established for measuring external dimensions. 2. With calipers type T-I The measuring range only applies to measurements of external dimensions and depth. 3. The upper limit of measurement of type I and T-I calipers should be no more than 300 mm. 4. It is allowed to produce calipers with separate verniers or scales for measuring external and internal dimensions. 5. It is allowed to manufacture type III calipers with surfaces for measuring external dimensions made of carbide. (Carbide alloy according to GOST 3882).

An example of a type II caliper symbol with a measuring range of 0-250 mm and a vernier reading value of 0.05 mm:

Vernier caliper ShTs-II-250-0.05 GOST 166-89

The same, type II calipers with a measuring range of 250-630 mm and a vernier reading value of 0.1 mm, accuracy class 1:

Vernier caliper ShTs-II-250-630-0.1-1 GOST 166-89

The same, type I calipers with a measuring range of 0-150 mm with a dial division of 0.02 mm:

Vernier caliper ShTsK-I-150-0.02 GOST 166-89

The same, type I calipers with a measuring range of 0-125 mm with a discrete step of a digital reading device of 0.01 mm:

Vernier caliper ShTsTs-I-125-0.01 GOST 166-89

1.4. Vernier calipers of types II and III, equipped with a marking device, should be equipped with a device for fine installation of the frame (Fig. 3).

For fine installation of the frame, micrometric feed can be used.

1.5. The extension of the jaws for measuring external dimensions and the extension of the jaws and for measuring internal dimensions must correspond to those indicated in Table 2 (Figures 1-4).

table 2


Range measurements
			no less

1.6. Types II and III calipers with jaws for measuring internal dimensions must have a cylindrical measuring surface with a radius of no more than half the total thickness of the jaws (no more ).

For calipers with a measurement limit of up to 400 mm, the size (Fig. 3-4) should not exceed 10 mm, and for calipers with an upper measurement limit of over 400 mm - 20 mm.

1.7. The length of the vernier should be selected from the range: 9; 19; 39 mm - with a vernier reading value of 0.1 mm, 19; 30 mm - with a vernier reading value of 0.05 mm.

Long vernier strokes may be marked with integers.

1.8. Calipers with a digital reading device must ensure the performance of functions characterizing the degree of automation in accordance with the list (according to the application).

1.9. Digital readout calipers must be powered from the built-in power supply.

Power supply for calipers that have measurement results displayed on external device, must be carried out from the built-in power source and (or) from the network general purpose via the power supply.

(Changed edition, Amendment No. 2).

1.10. The design of calipers with a digital reading device must ensure correct readings at the highest permissible speed of frame movement of at least 0.5 m/s.

1.11. (Deleted, Amendment No. 2).

2. TECHNICAL REQUIREMENTS

2.1. Calipers should be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.

2.2. Vernier calipers with a vernier reading value of 0.1 mm and an upper measurement limit of up to 400 mm and calipers with a circular scale reading with a division value of 0.1 mm should be manufactured in two accuracy classes: 1 and 2.

2.3. Limit of permissible error of calipers at temperature environment(20±5) °C must correspond to that specified in Table 3.

2.4. The permissible error limit of calipers of types I and T-I when measuring depth equal to 20 mm must correspond to Table 3.

Table 3


Measuring length	Limit of permissible error of calipers (±)
	at the vernier reading value	with the division value of the circular scale of the reading device	with discreteness step of digital readout device
		0.1 for accuracy class		0.1 for accuracy class


St. 100 to 200




" 800 " 1000
" 1000 " 1100
" 1100 " 1200
" 1200 " 1300
" 1300 " 1400
" 1400 " 1500
" 1500 " 2000
Notes: 1. The nominal distance between the measuring surfaces of the jaws is taken as the measured length. 2. For calipers with one vernier, the error is checked using jaws for measuring external dimensions. 3. When moving the jaws of the calipers until they touch, the displacement of the zero stroke of the vernier is allowed only in the direction of increasing size. 4. The error of the caliper should not exceed the values indicated in Table 3 at a temperature of (20±10) °C when checking them against plane-parallel gauge blocks made of steel.

2.5. The tolerance for flatness and straightness of the measuring surfaces should be 0.01 mm per 100 mm of the length of the larger side of the measuring surface of the calipers.

In this case, the permissible deviations of flatness and straightness of the measuring surfaces should be:

0.004 mm - for calipers with a reading value along the vernier, with a scale division value and a discrete step of no more than 0.05 mm and the length of the larger side of the measuring surface is less than 40 mm;

0.007 mm - for calipers with a reading value along the vernier and with a scale division value of 0.1 mm and the length of the larger side of the measuring surface is less than 70 mm.

The straightness tolerance of the rod end of type I and T-I calipers should be 0.01 mm.

Blockages are allowed along the edges of flat measuring surfaces in an area not exceeding 0.2 mm wide.

Note. The flatness requirements only apply to surfaces wider than 4 mm.

(Changed edition, Amendment No. 1, 2).

2.6. The parallelism tolerance of the measuring surfaces of the jaws for measuring internal dimensions must be 0.010 mm over the entire length. For calipers of accuracy class 2, the measuring surfaces of the edge jaws can be manufactured with a parallelism tolerance of 0.02 mm.

Blockages are allowed in the area up to 0.5 mm from the top edge of the measuring surfaces.

The parallelism tolerance per 100 mm of the length of the flat measuring surfaces of the jaws for measuring external dimensions should be:

0.02 mm - with a vernier reading value, scale division value and discrete step of no more than 0.05 mm;

0.03 mm - with a reading value of the vernier and a scale division value of 0.1 mm.

2.7. The backlash of the micrometric pair of the device for fine installation of the frame should not exceed a revolution.

2.8. Deviations in the size of jaws with cylindrical measuring surfaces for measuring internal dimensions should not exceed: () mm with a division value or vernier reading value of at least 0.05 mm; () mm when the division value or discrete step is less than 0.05 mm.

2.9. The frame should not move along the rod under its own weight when the caliper is in a vertical position.

2.10. The force of moving the frame along the rod should be no more than the values indicated in Table 4.

Table 4

2.11. Requirements for the rod and vernier scale

2.11.1 The location of the vernier scale plane relative to the rod scale plane is indicated in Figure 7.

2.11.2. The distance from the upper edge of the vernier edge to the surface of the rod scale should not exceed 0.25 mm for calipers with a reading value of 0.05 and 0.30 mm for calipers with a reading value of 0.1 mm.

2.11.3. The dimensions of the strokes of the rod and vernier scales must correspond to the following:

stroke width 0.08-0.20 mm;

the difference in the width of the strokes within one scale (for a rod scale at a distance of more than 0.3 mm from the edge of the scale) and the strokes of the rod scales and the vernier of one caliper is no more than 0.03 mm when reading along the vernier 0.05 mm; 0.05 mm with a vernier reading of 0.1 mm.

(Changed edition, Amendment No. 2).

2.12. Requirements for the circular scale of the reading device

2.12.1. The length of the scale division must be at least 1 mm.

2.12.2. The width of the scale lines is 0.15-0.25 mm. The difference in the width of the corresponding strokes within the same scale should be no more than 0.05 mm.

2.12.3. The width of the arrow above the scale divisions should be 0.15-0.20 mm. The end of the arrow should overlap short strokes by no more than 0.8 of their length. The distance between the end of the hand and the dial should not exceed 0.7 mm for a scale with a division value of no more than 0.05 mm and 1.0 mm with a division value of 0.1 mm.

2.12.4. The reading device must provide the ability to align the arrow with the zero division of the dial scale.

2.13. For calipers with a digital reading device, the height of the reading device digits must be at least 4 mm.

2.14. Calipers with a digital reading device can additionally be equipped with an interface for outputting the measurement result to an external device.

2.15. The hardness of the measuring surfaces of calipers must be: from tool and structural steel - not less than 59;

from high-alloy steel - no less than 51.5.

Note. For type I calipers with an upper measurement limit of up to 160 mm, made of tool or structural steel, the hardness of the measuring surfaces must be at least 53.

2.16. The roughness parameter of flat and cylindrical measuring surfaces of calipers is 0.32 microns according to GOST 2789;

measuring surfaces of edge jaws and flat auxiliary measuring surfaces - 0.63 microns according to GOST 2789.

2.17. The outer surfaces of calipers must be coated or treated in accordance with Table 5.

Table 5


Surface name	Upper limit of measurement, mm	Type of treatment or coating steel calipers
		highly alloyed	instrumental and structural
Rod (except scale and end), jaws, caliper frame, microfeed frame, excluding measuring and adjacent surfaces			Chrome plating
Bar and vernier scale		Matte coating	Matt chrome plating
			Chrome plating
	St. 630 to 2000		Chrome plating
Note. It is allowed to use other metallic and non-metallic coatings in accordance with GOST 9.303 and GOST 9.032, with protective and decorative properties not inferior to those indicated in Table 5. It is allowed for calipers with an upper measurement limit of over 1000 mm not to be chromed.

2.16, 2.17. (Changed edition, Amendment No. 1).

2.18. Calipers must be demagnetized.

2.19. (Deleted, Amendment No. 2).

2.20. (Deleted, Amendment No. 1).

2.21-2.24. (Excluded, Amendment No. 2).

2.25. Completeness

2.25.1. Each caliper must be accompanied by operational documentation in accordance with GOST 2.601*.
________________
* GOST 2.601-2006 is in force on the territory of the Russian Federation. - .

2.25.2. At the customer's request, calipers of types II and III are equipped with a device for marking.

2.26. Marking

2.26.1. Each caliper must be marked with:

manufacturer's trademark;

serial number according to the numbering system of the manufacturer;

symbol Year of release;

vernier reading value or division value;

size (for type II and III calipers with one vernier or one scale, Fig. 3-4) on one of the jaws;

accuracy class 2 (for calipers with a vernier reading value or a scale division value of 0.1 mm);

the word "Internal" on a scale for measuring internal dimensions.

(Changed edition, Amendment No. 2).

2.26.2. It is allowed not to indicate the serial number in the operational documentation.

2.26.3. Marking on the case is in accordance with GOST 13762.

The name or symbol of the caliper is applied only on the hard case.

2.27. Package

2.27.1. Methods and means for degreasing and preserving calipers - according to GOST 9.014.

2.27.2. Vernier calipers must be packaged in cases made of materials in accordance with GOST 13762. For vernier calipers with an upper limit of up to 630 mm inclusive, soft packaging is allowed.

2.27.3. When transported in containers, calipers with a measurement limit of over 400 mm may be packed in cases without shipping containers.

When packing without transport containers, cases with calipers must be secured so that the possibility of their movement is excluded.

3. ACCEPTANCE

3.1. To check the compliance of calipers with the requirements of this standard, state tests, acceptance inspection, and periodic tests should be carried out.

(Changed edition, Amendment No. 2).

3.2. State tests - according to GOST 8.383* and GOST 8.001*.
________________
* PR 50.2.009-94** applies on the territory of the Russian Federation.
** The document is not valid on the territory of the Russian Federation. The procedure for testing standard samples or measuring instruments for the purpose of type approval, the Procedure for approving the type of standard samples or the type of measuring instruments, the Procedure for issuing certificates of approval of the type of standard samples or the type of measuring instruments, establishing and changing the validity period of these certificates and the interval between verifications of measuring instruments are in effect. , Requirements for type approval marks of standard samples or type of measuring instruments and the procedure for their application, approved by Order of the Ministry of Industry and Trade of Russia dated November 30, 2009 N 1081. - .

Checking the errors of calipers at a temperature of (20±10) °C is carried out only during state tests.

3.3. During acceptance inspection, each caliper is checked for compliance with the requirements of clause 1.3; 1.4; 1.6; 1.8; 2.3-2.10; 2.12.4; 2.16; 2.18; 2.25; 2.26.

3.4. Periodic tests are carried out at least once every 3 years on at least 3 calipers of each standard size from those that have passed acceptance control for compliance with all the requirements of this standard.

Test results are considered satisfactory if all samples meet all tested requirements.

(Changed edition, Amendment No. 2).

3.5. (Deleted, Amendment No. 2).

4. CONTROL AND TEST METHODS

4.1. Verification of calipers - according to GOST 8.113 and MI 1384.

4.2. When determining the influence of transport shaking, an impact stand is used, which creates shaking with an acceleration of 30 m/s at a frequency of 80-120 beats per minute.

Vernier calipers in packaging are attached to a stand and tested at total number blows 15000. After testing, the error of calipers should not exceed the values specified in Table 3.

It is allowed to test calipers by transporting them to truck at a speed of 20-40 km/h for a distance of at least 100 km on a dirt road.

4.3. Impact climatic factors external environment during transportation, they are determined in climatic chambers in the following modes: at a temperature of minus (50±3) °C, plus (50±3) °C and at humidity (95±3)%. Exposure in the climatic chamber for each of the three types of tests is 2 hours. After the tests, the error of the calipers should not exceed the values indicated in Table 3.

It is allowed, after holding the calipers in each mode, to keep it in normal conditions within 2 hours

5. TRANSPORTATION AND STORAGE

Transportation and storage - according to GOST 13762.

6. OPERATING INSTRUCTIONS

Calipers can be used at ambient temperatures from 10 to 40 °C and relative humidity air - no more than 80% at a temperature of 25 °C.

7. MANUFACTURER WARRANTY

The manufacturer guarantees that calipers comply with the requirements of this standard subject to the conditions of transportation, storage and operation.

The warranty period for calipers is 12 months from the date of commissioning, for calipers equipped with a hard alloy - 18 months, and when sold through a retail network - 12 months from the date of sale.

APPENDIX (required). LIST OF FUNCTIONS CHARACTERIZING THE DEGREE OF AUTOMATION

APPLICATION
Mandatory

1. Issuance of digital information in direct code (indicating the sign and absolute value).

2. Setting the origin in the absolute coordinate system.

3. Memorizing the measurement result*.
________________
* By customer request.

4. Memory clearing with restoration of the current measurement result*.
________________
* By customer request.

5. Output of measurement results to an external device*.
________________
* By customer request.

6. Pre-zero setting.

7. Preset number (input of constants)*.
________________
* By customer request.

8. Comparison of measurement results with threshold limits*.
________________
* By customer request.

9. Arithmetic operations with measurement results and constants*.
________________
* By customer request.

Electronic document text
and verified by:
official publication
M.: IPK Standards Publishing House, 2003

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1. TYPES. MAIN PARAMETERS AND DIMENSIONS

1.1. Calipers should be made of the following main types:

I - double-sided with a depth gauge (Fig. 1);

T-1 - single-sided with a depth gauge with measuring surfaces made of hard alloys (Figure 2);

II - double-sided (Fig. 3);

III - one-sided (Figure 4).

Note. It is allowed to equip calipers with devices or auxiliary measuring surfaces to expand functionality (measuring heights, yielding, etc.).

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5
6 - depth gauge; 7 - jaws with edge measuring surfaces for measuring internal
sizes; 8 - jaws with flat measuring surfaces for measuring external dimensions;
9 - rod scale.

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface of the rod;
6 - depth gauge; 7 - jaws with flat measuring surfaces for measuring external
sizes; 8 - rod scale.

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface of the rod;
6 - device for fine frame adjustment; 7 - jaws with edge measuring surfaces for
measurements of external dimensions; 8 - jaws with flat and cylindrical measuring
surfaces for measuring external and internal dimensions, respectively; 9 - rod scale.

1 - rod; 2 - frame; 3 - clamping element; 4 - vernier; 5 - working surface of the rod;
6 - jaws with flat measuring surfaces for measuring external dimensions;
7 - jaws with cylindrical measuring surfaces for measuring internal dimensions;
8 - rod scale.

1.2. The caliper should be made with a vernier reading (SD) (Fig. 1 - 4) or with a circular scale reading (SCC) (Fig. 5), or with a digital reading device (DVR) (Fig. 6).

1 - circular scale of the reading device; 2 - rod; 3 - frame; 4 - rod scale.

1 - digital reading device; 2 - rod; 3 - frame.

Note. Features 1 - 6 do not define the design of calipers.

1.3. The measurement range, the reading value of the vernier, the division value of the circular scale and the discrete step of the digital reading device of calipers must correspond to those indicated in the table. 1.

Table 1

Measuring range of calipers	Vernier reading value	Dividing value of the circular scale of the reading device	Discrete step of digital readout device

Notes:

1. The lower limit of measurement for calipers with an upper limit of up to 400 mm is set for measuring external dimensions.

2. For T-I type calipers, the measuring range applies only to measurements of external dimensions and depth.

3 The upper limit of measurement for type I and T-I calipers should be no more than 300 mm .

4. It is allowed to produce calipers with separate verniers or scales for measuring external and internal dimensions.

5. It is allowed to manufacture type III calipers with surfaces for measuring external dimensions made of carbide. (Carbide alloy according to GOST 3882).

An example of a symbol for a type II caliper with a measuring range of 0 - 250 mm and a vernier reading value of 0.05 mm:

Calipers Shts-II - 250 - 0 ,05 GOST 166-89

The same, type II calipers with a measuring range of 250 - 630 mm and a vernier reading value of 0.1 mm, accuracy class 1.

Calipers Shts-II - 250 - 630 - 0 ,1 - 1 GOST 166-89

The same, type I calipers with a measuring range of 0 - 150 mm with a dial division of 0.02 mm.

Calipers Shtsk-I - 150 - 0 ,02 GOST 166-89

The same, type I calipers with a measuring range of 0 - 125 mm with a discrete step of a digital reading device of 0.01 mm:

Calipers SCC-I - 125 - 0 ,01 GOST 166-89

1.4. Vernier calipers of types II and III, equipped with a marking device, should be equipped with a device for fine installation of the frame (Fig. 3).

For fine installation of the frame, micrometric feed can be used.

1.5. Sponge flight l And l 2 for measuring external dimensions and jaw extension l 1 and l 3 to measure the internal dimensions must correspond to those indicated in the table. 2 (drawings 1 - 4).

table 2

Measurement range
Measurement range

1.6. Types II and III calipers with jaws for measuring internal dimensions must have a cylindrical measuring surface with a radius of no more than half the total thickness of the jaws (no more than g/2).

For calipers with a measuring limit up to 400mm size g(Fig. 3 - 4) should not exceed 10 mm, and for calipers with an upper measurement limit of over 400 mm - 20 mm.

1.7. The vernier length should be selected from row 9; 19; 39 mm - with a vernier reading value of 0.1 mm, 19; 30 mm - with a vernier reading value of 0.05 mm.

Long vernier strokes may be marked with integers.

1.8. Calipers with a digital reading device must ensure the performance of functions characterizing the degree of automation in accordance with the list (according to the application).

1.9. Digital readout calipers must be powered from the built-in power supply.

Vernier calipers that have measurement results output to an external device must be powered from the built-in power supply and (or) from a general-purpose network through a power supply.

1.10. The design of calipers with a digital reading device must ensure correct readings at the highest permissible speed of frame movement of at least 0.5 m/s.

2. TECHNICAL REQUIREMENTS

2.1. Calipers should be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.

2.3. The permissible error limit of calipers at ambient temperature (20 ± 5) °C must correspond to that indicated in the table. 3.

2.4. The permissible error limit of calipers of types I and T-I when measuring depth equal to 20 mm must correspond to table. 3.

Table 3

Measuring length	Limit of permissible error of calipers (±)
	at the vernier reading value		with the division value of the circular scale of the reading device		with discrete step of digital readout device
		0.1 for accuracy class		0.1 for accuracy class


St. 100 to 200





« 1000 « 1100
« 1100 « 1200
« 1200 « 1300
« 1300 « 1400
« 1400 « 1500

Notes:

1. The nominal distance between the measuring surfaces of the jaws is taken as the measured length.

2. For calipers with one vernier, the error is checked using jaws for measuring external dimensions.

3. When moving the jaws of the calipers until they touch, the displacement of the zero stroke of the vernier is allowed only in the direction of increasing size.

4. The error of the caliper should not exceed the values specified in the table. 3 at a temperature of (20 ± 10) °C when checking them against plane-parallel gauge blocks made of steel.