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INTERSTATE STANDARD

TAPS FOR TAPERED THREAD

TECHNICAL CONDITIONS

Official edition

IPK PUBLISHING STANDARDS Moscow

INTERSTATE STANDARD

TAPS FOR TAPER THREADS Specifications

Taps for taper thread. Specifications

MKS 25.100.50 OKP 39 1335

Date of introduction 01.07.81

This standard applies to taps designed for cutting tapered inch threads with a profile angle of 60 ° according to GOST 6111 and taper pipe threads according to GOST 6211 on drilling machines, automatic machines and modular machines using special chucks for cutting tapered threads in threaded connections of pipelines of machines and machines manufactured for the needs of the country's economy and export.

The standard fully complies with ST SEV 424.

The requirements of the standard in Sec. 1, 2, 4, 5 and paragraphs. 3.1.1 and 3.1.2 are mandatory.

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

1. BASIC DIMENSIONS AND THREAD PROFILE

1.1. Main dimensions and thread profile 1 and in table. 1 and 2.

taps must correspond to those indicated on

Thread profile of taps for taper inch thread with profile angle 60°according to GOST 6111

Thread profile of taps for taper pipe threads with a profile angle of 55° according to GOST 6211

Notes:

1. The profile angle bisector is perpendicular to the tap axis.

2. Thread pitch is measured parallel to the tap axis.

3. Limit deviations of the dimensions of the thread profile should be measured from the lines of the theoretical profile in the direction perpendicular to the axis of the tap.

size for reference.

Official publication Reprint prohibited

* © Standards Publishing, 1980

© IPK Standards Publishing House, 2003

Editor R. S. Fedorova Technical editor N.S. Grishanova Proofreader M.V. Book Computer Layout L A. Krugovoi

Ed. persons. No. 02354 dated 07/14/2000. Handed over to the set 24.09.2003. Signed for publication on October 30, 2003. Uel. oven l. 1.40.

Uch.-ed. l. 1.00. Circulation 86 copies. From 12607. Order. 330.

IPK Publishing house of standards, 107076 Moscow, Kolodezny per., 14. http://www.standards.ru e-mail: [email protected] Typed and printed in the IPK Publishing house of standards

Taps for tapered inch thread according to GOST 6111

Dimensions in mm Table 1

Designation Applicability Thread size designation Number of steps per 25.4 mm length Limit deviations Previous off for hi Previous off for hi half angle profile

With. 2 GOST 6111-t

An example of a symbol for a tap for cutting a taper inch thread K "D" with a shank diameter d ( = 14 mm:

Designation

Applicability

Thread size designation

Number of steps per 25.4 mm length

Р (limit deviation ± 0.013 at length up to 25 mm)

Limit deviations

(prev, off: highs +0.015 -0.025; lows +0.050)

half angle profile

An example of a symbol for a tap for cutting Rc U 4 taper pipe threads:

GOST 6111-t S. 3

1.3. For thread taps K1/16", Rc 1/16; K1/8", Rc 1/8; K1/4", Rc 1/4, it is allowed to make a groove to exit the circle when grinding threads.

1.4. Center holes - form A according to GOST 14034. Taps for thread K 1/16", Rc 1/16 can be made with external centers.

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

1.5. Rounding along the top and bottom of the profile of a conical inch thread is allowed within the tolerance field by the value h\.

1.6. Structural elements and geometric parameters of taps are specified in Appendix 1.

2. TECHNICAL REQUIREMENTS

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

2.2. Taps must be made of high speed steel according to GOST 19265.

2.3. Taps for threads K 3 / 8 "and Rc 3 / 8 and more must be made welded. Taps for threads Rc Vs and V4 can be made welded. In the welding zone, shells, lack of fusion, metal burning, ring cracks and fistulas are not allowed.

2.4. Shanks of welded taps must be made of steel grade 45 according to GOST 1050 or steel grade 40X according to GOST 4543.

2.5. The hardness of taps should be:

working part - 63 ... 66 HRC 3;

for taps made of high-speed steel with a vanadium content of 3% or more and cobalt of 5% or more - 64 ... 68 HRC 3;

shank length including square and annular groove:

for welded taps - 37 ... 52 HRC 3;

for solid taps - 37 ... 57 HRC 3 .

(Revised edition, Rev. No. 1).

2.6. Taps are allowed to be made cyanidated.

2.7. The parameters of the surface roughness of the taps according to GOST 2789 should not be more than, microns:

thread profile, rake and rake................................Rz3.2

shank (in the landing part) ............... 7? a0.8

grooves.................................LCO

other surfaces ........................Rz25

Note. The rake surface roughness parameter must be maintained at a height of at least 1 x / 2 of the thread profile height. A fracture of the front surface towards the undercut is allowed.

(Revised edition, Rev. No. 1).

2.8. After heat treatment, the center holes and outer centers must be machined.

(Revised edition, Rev. No. 2).

2.9. The taps must be backed along the profile along the entire length of the working part and along the outer surface of the intake cone.

2.10. By agreement with the consumer, it is allowed to manufacture taps without annular grooves.

2.11. The maximum deviations of tap sizes should not be more than:

overall length L......................Y6

length of the working part / 2j s 16

chamfer length /1 plus thread pitch

length to the main plane / o ............................ ± * / 2 thread pitches

length k ................................ j s 15

shank diameter d\.......................h9

diameter of the annular grooves ch......................hl4

radius of the annular grooves r.......................H16

rake angle..............................±2°

GOST 6227-80 p. 5

back angle on the cutting (chasing) part for threads:

FROM 7l6" to */4"...............................± 1°30"

from V to 2"................................± G.

2.12. (Deleted, Rev. No. 1).

2.13. The tolerances of the radial runout of the cutting part, the gauge part and the shank must correspond to those indicated in Fig. 2 and in table. 3.

Table 3 Dimensions in mm

Thread size designation K 1/16"-K 1/2", Rc 1/16 - Rc 1/2 K 1" - K 2", Rc 1 - Rc 2

(Revised edition, Rev. No. 1).

2.14. The mean time to failure and 95% running time of taps made of steel grade R6M5 must be at least the values ​​\u200b\u200bspecified in Table. Behind.

Table For

Thread size designation Mean time to failure, pcs. (number of cut holes) 95% operating time, pcs. (number of cut holes) K 1/4", K 3/8"; Kc 1/4, Rc 3/8

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

2.15. The criterion for tap blunting is the non-compliance of the thread being cut with the required accuracy.

(Introduced additionally, Rev. No. 1).

2.16. On the shank of the tap must be clearly marked: the trademark of the manufacturer; tap designation (last four digits); thread designation;

steel grade of the working part.

Notes:

1. It is allowed not to mark the R6M5 steel grade.

2. It is allowed to mark letters instead of the steel grade:

HSS - for steel with a tungsten content of 6% or more;

HSSCo - for steel with cobalt content, indicating the steel grade on the label.

3. On taps for threads K - K 1/4 ", Rc 1 /, 6 - Rc "/ 4, marking marks can be applied on a square.

4. On taps for threads K "/c" - K X C"> Rc Vi6 - Rc 1V4, the designation of the taps may not be marked.

2.17. Transport marking, marking of consumer packaging and packaging - according to GOST 18088.

2.16, 2.17. (Introduced additionally, Amendment No. 2).

With. 6 GOST 6227-80

3. ACCEPTANCE

(Revised edition, Rev. No. 1).

3.1.1. Periodic tests for mean time to failure are carried out once every three years, for 95% time - once a year for at least five taps.

3.1.1, 3.1.2. (Changed edition, Rev. No. 1, 2).

3.1.2. Tap testing must be done on one size for each range

4. CONTROL METHODS

4.1. Testing of taps should be carried out on drilling or thread-cutting machines that meet the standards of accuracy and rigidity established for them.

4.2. The fastening of the taps should be carried out with the help of cartridges that provide self-installation of the taps or the product in the radial direction, compensating for the deviation from the hole and the tap.

4.3. Taps should be tested on samples of steel grade 45 according to GOST 1050, hardness 197 .. . 207 HB.

4.4. For products intended for threading, holes must be pre-treated with conical reamers with a taper of 1: 16. The diameter of the machined hole must correspond to the inner diameter of the thread according to GOST 6111 or the diameter of the holes for cutting pipe taper threads according to GOST 21350.

4.1-4.4. (Revised edition, Rev. No. 1).

4.5. Test taps for performance, mean time to failure and 95%

Table 5

Thread size designation Quantity chopped holes From K 1/16" to K 1/4"; Rc 1/16 to Rc 1/4 K 3/8" and K 1/2"; Rc 3/8 and Rc 1/2 K 3/4" and K 1"; Rc 3/4 and Rcl From K1 1/4" to K 2"; from Rcl 1/4 to Rc2

operating time should be carried out in the modes indicated in table. 4.

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

4.6. Each test subject for the performance of the taps must cut the number of holes indicated in Table. 5.

After performance testing, the cutting edges shall show no chipping. Taps after testing must be suitable for further work.

4.7. As a cutting fluid for machine threading, a 5% (by mass) solution of emulsol in water is used with a flow rate of at least 5 l / min.

4.6. 4.7. (Revised edition, Rev. No. 1).

4.8. Acceptance values ​​of mean time to failure and 95% time should not be less than those indicated in Table. 6.

Table 6

Thread size designation K 1/16", K 1/8"; Rc 1/16, Rc 1/8 K 1/4", K 3/8"; Rc 1/4, Rc 3/8

GOST 6111-t s. 7

Continuation of the table. 6

Designation thread dimensions Acceptance values ​​of operating time, pcs. (number of cut holes) K 1/2", K 3/4"; Rc 1/2, Rc 3/4 K 1", K 1 1/4"; Rc 1, Rc 1 1/4 K 1 1/2", K 2"; Rc 1 1/2, Rc 2

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

4.9. The hardness of the taps is measured according to GOST 9013.

4.10. Appearance is controlled by inspection.

4.11. The surface roughness parameters of the taps are checked by comparison with roughness samples according to GOST 9378 or with exemplary tools that have the surface roughness parameters specified in and. 2.7 using a magnifying glass LP-1-4 x according to GOST 25706.

4.12. When controlling the parameters of taps, methods and measuring instruments should be used, the error of which does not exceed.

INTERSTATE STANDARD

TAPS FOR TAPERED THREAD

TECHNICAL CONDITIONS

Official edition

IPK PUBLISHING STANDARDS Moscow

INTERSTATE STANDARD

TAPS FOR TAPER THREADS Specifications

Taps for taper thread. Specifications

MKS 25.100.50 OKP 39 1335

Date of introduction 01.07.81

This standard applies to taps designed for cutting tapered inch threads with a profile angle of 60 ° according to GOST 6111 and taper pipe threads according to GOST 6211 on drilling machines, automatic machines and modular machines using special chucks for cutting tapered threads in threaded connections of pipelines of machines and machines manufactured for the needs of the country's economy and export.

The standard fully complies with ST SEV 424.

The requirements of the standard in Sec. 1, 2, 4, 5 and paragraphs. 3.1.1 and 3.1.2 are mandatory.

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

1. BASIC DIMENSIONS AND THREAD PROFILE

1.1. Main dimensions and thread profile 1 and in table. 1 and 2.

taps must correspond to those indicated on

Thread profile of taps for taper inch thread with profile angle 60°according to GOST 6111

Thread profile of taps for taper pipe threads with a profile angle of 55° according to GOST 6211

Notes:

1. The profile angle bisector is perpendicular to the tap axis.

2. Thread pitch is measured parallel to the tap axis.

3. Limit deviations of the dimensions of the thread profile should be measured from the lines of the theoretical profile in the direction perpendicular to the axis of the tap.

Official publication Reprint prohibited

* © Standards Publishing, 1980

© IPK Standards Publishing House, 2003

Taps for tapered inch thread according to GOST 6111

Dimensions in mm

Table 1

Designation

Applicability

Thread size designation

Number of steps per 25.4 mm length

Limit deviations

Previous off for hi

Previous off for hi

half angle profile

An example of a symbol for a tap for cutting a taper inch thread K "D" with a shank diameter d ( = 14 mm:

Tap 2680-0006 GOST 6227

With. 2 GOST 6111-t

Taps for tapered pipe thread according to GOST 6211

Designation

Applicability

Thread size designation

Number of steps per 25.4 mm length

Р (limit deviation ± 0.013 at length up to 25 mm)

Limit deviations

(prev, off: highs +0.015 -0.025; lows +0.050)

half angle profile

An example of a symbol for a tap for cutting Rc U 4 taper pipe threads:

Tap 2680-0016 GOST 6227

GOST 6111-t S. 3

1.2. The dimensions of the squares are in accordance with GOST 9523.

1.3. For thread taps K1/16", Rc 1/16; K1/8", Rc 1/8; K1/4", Rc 1/4, it is allowed to make a groove to exit the circle when grinding threads.

1.4. Center holes - form A according to GOST 14034. Taps for thread K 1/16", Rc 1/16 can be made with external centers.

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

1.5. Rounding along the top and bottom of the profile of a conical inch thread is allowed within the tolerance field by the value h\.

1.6. Structural elements and geometric parameters of taps are specified in Appendix 1.

2. TECHNICAL REQUIREMENTS

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

2.2. Taps must be made of high speed steel according to GOST 19265.

2.3. Taps for threads K 3 / 8 "and Rc 3 / 8 and more must be made welded. Taps for threads Rc Vs and V4 can be made welded. In the welding zone, shells, lack of fusion, metal burning, ring cracks and fistulas are not allowed.

2.4. Shanks of welded taps must be made of steel grade 45 according to GOST 1050 or steel grade 40X according to GOST 4543.

2.5. The hardness of taps should be:

working part - 63 ... 66 HRC 3;

for taps made of high-speed steel with a vanadium content of 3% or more and cobalt of 5% or more - 64 ... 68 HRC 3;

shank length including square and annular groove:

for welded taps - 37 ... 52 HRC 3;

for solid taps - 37 ... 57 HRC 3 .

(Revised edition, Rev. No. 1).

2.6. Taps are allowed to be made cyanidated.

2.7. The parameters of the surface roughness of the taps according to GOST 2789 should not be more than, microns:

thread profile, rake and rake................................Rz3.2

shank (in the landing part) ............... 7? a0.8

grooves.................................LCO

other surfaces ........................Rz25

Note. The rake surface roughness parameter must be maintained at a height of at least 1 x / 2 of the thread profile height. A fracture of the front surface towards the undercut is allowed.

(Revised edition, Rev. No. 1).

2.8. After heat treatment, the center holes and outer centers must be machined.

(Revised edition, Rev. No. 2).

2.9. The taps must be backed along the profile along the entire length of the working part and along the outer surface of the intake cone.

2.10. By agreement with the consumer, it is allowed to manufacture taps without annular grooves.

2.11. The maximum deviations of tap sizes should not be more than:

overall length L......................Y6

length of the working part / 2j s 16

chamfer length /1 ..........................plus thread pitch

length to the main plane / o ............................ ± * / 2 thread pitches

length k ................................ j s 15

shank diameter d\.......................h9

diameter of the annular grooves ch......................hl4

radius of the annular grooves r.......................H16

rake angle..............................±2°

back angle on the cutting (chasing) part for threads:

FROM 7l6" to */4"...............................± 1°30"

from V to 2"................................± G.

2.12. (Deleted, Rev. No. 1).

2.13. The tolerances of the radial runout of the cutting part, the gauge part and the shank must correspond to those indicated in Fig. 2 and in table. 3.

Table 3

Dimensions in mm

Thread size designation
K 1/16"-K 1/2", Rc 1/16 - Rc 1/2
K 1" - K 2", Rc 1 - Rc 2

(Revised edition, Rev. No. 1).

2.14. The mean time to failure and 95% running time of taps made of steel grade R6M5 must be at least the values ​​\u200b\u200bspecified in Table. Behind.

Table For

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

2.15. The criterion for tap blunting is the non-compliance of the thread being cut with the required accuracy.

(Introduced additionally, Rev. No. 1).

2.16. On the shank of the tap must be clearly marked: the trademark of the manufacturer; tap designation (last four digits); thread designation;

steel grade of the working part.

Notes:

1. It is allowed not to mark the R6M5 steel grade.

2. It is allowed to mark letters instead of the steel grade:

HSS - for steel with a tungsten content of 6% or more;

HSSCo - for steel with cobalt content, indicating the steel grade on the label.

3. On taps for threads K - K 1/4 ", Rc 1 /, 6 - Rc "/ 4, marking marks can be applied on a square.

4. On taps for threads K "/c" - K X C"> Rc Vi6 - Rc 1V4, the designation of the taps may not be marked.

2.17. Transport marking, marking of consumer packaging and packaging - according to GOST 18088.

2.16, 2.17. (Introduced additionally, Amendment No. 2).

3. ACCEPTANCE

3.1. Acceptance rules - according to GOST 23726.

(Revised edition, Rev. No. 1).

3.1.1. Periodic tests for mean time to failure are carried out once every three years, for 95% time - once a year for at least five taps.

3.1.2. Tap testing must be done on one size for each range

3.1.1, 3.1.2. (Changed edition, Rev. No. 1, 2).

4. CONTROL METHODS

4.1. Testing of taps should be carried out on drilling or thread-cutting machines that meet the standards of accuracy and rigidity established for them.

4.2. The fastening of the taps should be carried out with the help of cartridges that provide self-installation of the taps or the product in the radial direction, compensating for the deviation from the hole and the tap.

4.3. Taps should be tested on samples of steel grade 45 according to GOST 1050, hardness 197 .. . 207 HB.

4.4. For products intended for threading, holes must be pre-treated with conical reamers with a taper of 1: 16. The diameter of the machined hole must correspond to the inner diameter of the thread according to GOST 6111 or the diameter of the holes for cutting pipe taper threads according to GOST 21350.

4.1-4.4. (Revised edition, Rev. No. 1).

4.5. Test taps for performance, mean time to failure and 95%

operating time should be carried out in the modes indicated in table. 4.

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

4.6. Each test subject for the performance of the taps must cut the number of holes indicated in Table. 5.

After performance testing, the cutting edges shall show no chipping. Taps after testing must be suitable for further work.

4.7. As a cutting fluid for machine threading, a 5% (by mass) solution of emulsol in water is used with a flow rate of at least 5 l / min.

4.6. 4.7. (Revised edition, Rev. No. 1).

4.8. Acceptance values ​​of mean time to failure and 95% time should not be less than those indicated in Table. 6.

Table 6

Table 5

Continuation of the table. 6

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

4.9. The hardness of the taps is measured according to GOST 9013.

4.10. Appearance is controlled by inspection.

4.11. The surface roughness parameters of the taps are checked by comparison with roughness samples according to GOST 9378 or with exemplary tools that have the surface roughness parameters specified in and. 2.7 using a magnifying glass LP-1-4 x according to GOST 25706.

4.12. When controlling the parameters of taps, methods and measuring instruments should be used, the error of which does not exceed:

when measuring linear dimensions - the values ​​\u200b\u200bspecified in GOST 8.051;

when measuring angles - 35% of the tolerance value for the angle being checked;

when controlling the shape and location of surfaces - 25% of the tolerance value for the parameter being checked.

4.13. Compliance of the parameters of the cut thread with the requirements and. 2.15 is controlled using conical threaded gauges (plugs) according to GOST 6485.

4.9-4.13. (Revised edition, Rev. No. 1).

5. TRANSPORT AND STORAGE

Transportation and storage - according to GOST 18088.

Sec. 5. (Changed edition, Rev. No. 2).

Sec. 6. (Deleted, Rev. No. 1).

STRUCTURAL ELEMENTS AND GEOMETRIC PARAMETERS OF TAPS

Structural elements and geometric parameters of the taps are indicated in the drawing and in the table.

Size for reference.

Dimensions in mm

Thread type	Thread size designation
Conical inch thread according to GOST 6111-52
Tapered pipe thread according to GOST 6211

Notes:

1. The bottom of the flutes to perform:

for taps for threads K 1/16 "- K 1/2", Rc 1/16 - Rc 1/2 - parallel to the generatrix of the cone; for taps for threads K 3/4 "- K 2", Rc 3/4 - Rc 2 - parallel to the axis of the tap.

2. K - the amount of backing is measured by the outer diameter on the cutting part (on the first turn adjacent to the calibrating part).

A) - the amount of backing along the entire profile, measured in the main plane.

3. Core diameter d c , tooth width F and rake angle are given in the main plane.

APPENDIX 1. (Changed edition, Rev. No. 1).

APPENDIX 2. (Deleted, Rev. No. 1).

INFORMATION DATA

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

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 09.06.80 No. 2655

3. The standard fully complies with ST SEV 424-77

4. The standard complies with the international standard ISO 2284-87

5. INSTEAD OF GOST 6227-71, GOST 5.2317-77

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number		Item number
GOST 8.051-81		GOST 9013-59
GOST 1050-88		GOST 9378-93
GOST 2789-73		GOST 9523-84
GOST 4543-71		GOST 14034-74
GOST 6111-52	Introduction, 1.1; 4.4;	GOST 18088-83
	Annex 1	GOST 19265-73
GOST 6211-81	Introduction, 1.1;	GOST 21350-75
	Annex 1	GOST 23726-79
GOST 6485-69		GOST 25706-83

7. The validity period was removed according to the protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)

8. EDITION (September 2003) with Amendments No. 1, 2, approved in December 1986, October 1990 (IUS 4-87, 1-91)

Editor R. S. Fedorova Technical editor N.S. Grishanova Proofreader M.V. Book Computer Layout L A. Krugovoi

Ed. persons. No. 02354 dated 07/14/2000. Handed over to the set 24.09.2003. Signed for publication on October 30, 2003. Uel. oven l. 1.40.

Uch.-ed. l. 1.00. Circulation 86 copies. From 12607. Order. 330.

IPK Publishing House of Standards, 107076 Moscow, Kolodezny per., 14. e-mail: Typed and printed in the IPK Publishing House of Standards

Engineering. GOST 6227-80: Tapered taps. Specifications. OKS: Mechanical engineering, Cutting tools. GOSTs. Taps for taper threads. Specifications. class=text>

GOST 6227-80

Taps for taper threads. Specifications

GOST 6227-80
Group G23

INTERSTATE STANDARD

TAPS FOR TAPERED THREAD

Specifications

Taps for taper thread. Specifications

ISS 25.100.50
OKP 39 1335

Introduction date 1981-07-01

INFORMATION DATA

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

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 09.06.80 N 2655

3. The standard fully complies with ST SEV 424-77

4. The standard complies with the international standard ISO 2284-87

5. INSTEAD OF GOST 6227-71, GOST 5.2317-77

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number
GOST 8.051-81
GOST 1050-88
GOST 2789-73
GOST 4543-71
GOST 6111-52	Introduction, 1.1; 4.4; Annex 1
GOST 6211-81	Introduction, 1.1; Annex 1
GOST 6485-69
GOST 9013-59
GOST 9378-93
GOST 9523-84
GOST 14034-74
GOST 18088-83
GOST 19265-73
GOST 21350-75
GOST 23726-79
GOST 25706-83

7. The limitation of the validity period was removed according to protocol N 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)

8. EDITION (September 2003) with Amendments No. 1, 2, approved in December 1986, October 1990 (IUS 4-87, 1-91)

This standard applies to taps designed for cutting tapered inch threads with a profile angle of 60 ° according to GOST 6111 and taper pipe threads according to GOST 6211 on drilling machines, automatic machines and modular machines using special chucks for cutting tapered threads in threaded connections of pipelines of machines and machines manufactured for the needs of the national economy and for export.
The standard fully complies with ST SEV 424.
The requirements of the standard in terms of sections 1, 2, 4, 5 and clauses 3.1.1 and 3.1.2 are mandatory.

1. BASIC DIMENSIONS AND THREAD PROFILE

1.1. The main dimensions and thread profile of the taps must correspond to those indicated in Fig. 1 and in Tables 1 and 2.

Damn.1. Thread profile of taps for taper inch thread with a profile angle of 60° according to GOST 6111; Thread profile of taps for pipe taper thread with profile angle 55° in accordance with GOST 6211

Taper thread profile for taper inch threads with a profile angle of 60° GOST 6111

Taper thread profile for taper pipe threads with a profile angle of 55° GOST 6211

____________
* Size for reference.

Notes:

1. The profile angle bisector is perpendicular to the tap axis.

2. Thread pitch is measured parallel to the tap axis.

3. Limit deviations of the dimensions of the thread profile should be measured from the lines of the theoretical profile in the direction perpendicular to the axis of the tap.

Tapered inch thread taps GOST 6111
Dimensions in mm

Table 1

Designation tap value

At- change- bridge

Designation time difference thread measure

Number of steps at a length of 25.4 mm

Limit deviations of angles

But- min.

Previous off For

Previous off For

polo- fault angle pro- filya

tilt angle

An example of a symbol for a tap for cutting a taper inch thread "with a shank diameter = 14 mm:

Tap 2680-0006 GOST 6227

Taps for taper pipe threads GOST 6211
Dimensions in mm

table 2

Limit deviations of angles

Designation tap value

At- change- bridge

Denomination- thread size

Number of steps per 25.4 mm length

(limit deviation ±0.013 at length up to 25 mm)

(prev. off: peaks +0.015 -0,025; depressions +0.050)

half angle profile

tilt angle

An example of a symbol for a tap for taper pipe threading:

Tap 2680-0016 GOST 6227

(Changed edition, Rev. N 1, 2).

1.2. The dimensions of the squares are in accordance with GOST 9523.

1.3. For thread taps , ; , ; , it is allowed to perform a groove to exit the circle when grinding the thread.

1.4. Center holes - form A according to GOST 14034. Taps for threading, it is allowed to manufacture with external centers.
(Changed edition, Rev. N 1, 2).

1.5. Rounding along the top and bottom of the profile of a conical inch thread is allowed within the tolerance field by the value.

1.6. Structural elements and geometric parameters of taps are specified in Appendix 1.

2. TECHNICAL REQUIREMENTS

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

2.2. Taps must be made of high speed steel according to GOST 19265.

2.3. Taps for threads and more must be welded. Taps for threading and can be made welded. In the welding zone, shells, lack of penetration, metal burning, ring cracks and fistulas are not allowed.

2.4. Shanks of welded taps must be made of steel grade 45 according to GOST 1050 or steel grade 40X according to GOST 4543.

2.5. The hardness of taps should be:

working part
for taps made of high-speed steel with a vanadium content of 3% or more and cobalt of 5% or more
shank length including square and annular groove:
for weld taps
for solid taps

(Changed edition, Rev. N 1).

2.6. Taps are allowed to be made cyanidated.

2.7. The parameters of the surface roughness of the taps according to GOST 2789 should not be more than, microns:

thread profile, rake and rake
shank (in the landing part)
other surfaces

Note. The roughness parameter of the front surface must be maintained at a height not less than the height of the thread profile. A fracture of the front surface towards the undercut is allowed.

(Changed edition, Rev. N 1).

2.8. After heat treatment, the center holes and outer centers must be machined.
(Changed edition, Rev. N 2).

2.9. The taps must be backed along the profile along the entire length of the working part and along the outer surface of the intake cone.

2.10. By agreement with the consumer, it is allowed to manufacture taps without annular grooves.

2.11. The maximum deviations of tap sizes should not be more than:

overall length
working part length
chamfer length	plus thread pitch
length to base plane	± thread pitch
shank diameter
annular groove diameter
radius of the annular grooves
front angle
back angle on the cutting (chasing) part for threads:

2.12. (Excluded, Rev. N 1).

2.13. Tolerances of the radial runout of the cutting part, the gauge part and the shank must correspond to those indicated in Fig. 2 and in Table 3.

Damn.2. Tolerances of radial runout of the cutting part, gauge part and shank

Damn.2

Table 3

Dimensions in mm

Thread size designation

(Changed edition, Rev. N 1).

2.14. The mean time to failure and 95% running time of taps made of steel grade R6M5 must be at least the values ​​indicated in Table 3a.

Table 3a

Thread size designation	Mean time to failure, pcs. (number of cut holes)	95% operating time, pcs. (number of cut holes)

(Changed edition, Rev. N 1, 2).

2.15. The criterion for tap blunting is the non-compliance of the thread being cut with the required accuracy.

(Introduced additionally, Rev. N 1).

2.16. The following must be clearly marked on the tap shank:
trademark of the manufacturer;
tap designation (last four digits);
thread designation;
steel grade of the working part.
Notes:

1. It is allowed not to mark the R6M5 steel grade.

2. It is allowed to mark letters instead of the steel grade:
HSS - for steel with a tungsten content of 6% or more;
HSSCo - for steel with cobalt content, indicating the steel grade on the label.

3. On taps for threading -, - marking marks can be applied on a square.

4. On thread taps -, - the designation of taps is allowed not to be marked.

2.17. Transport marking, marking of consumer packaging and packaging - according to GOST 18088.

2.16, 2.17. (Introduced additionally, Rev. N 2).

3. ACCEPTANCE

3.1. Acceptance rules - according to GOST 23726.
(Changed edition, Rev. N 1).

3.1.1. Periodic tests for mean time to failure are carried out once every three years, for 95% time - once a year for at least five taps.

3.1.2. Tap tests should be carried out on one standard size for each range of threads indicated in Table 4.

Table 4

Thread size designation	Cutting speed, m/min

3.1.1, 3.1.2. (Changed edition, Rev. N 1, 2).

4. CONTROL METHODS

4.1. Testing of taps should be carried out on drilling or thread-cutting machines that meet the standards of accuracy and rigidity established for them.

4.2. The fastening of the taps should be carried out with the help of cartridges that provide self-installation of the taps or the product in the radial direction, compensating for the deviation from the hole and the tap.

4.3. Taps should be tested on samples of steel grade 45 according to GOST 1050, hardness 197...207 HB.

4.4. For products intended for threading, holes must be pre-treated with conical reamers with a taper of 1:16. The diameter of the machined hole must correspond to the inner diameter of the thread according to GOST 6111 or the diameter of the holes for taper pipe threading according to GOST 21350.

4.1-4.4. (Changed edition, Rev. N 1).

4.5. Tests of taps for performance, mean time to failure and 95% running time should be carried out in the modes indicated in Table 4.
(Changed edition, Rev. N 1, 2).

4.6. The number of holes indicated in Table 5 must be cut by each test subject for performance with a tap.

Table 5

Thread size designation	Number of cut holes
From to ; from to
From to ; from to

After performance testing, the cutting edges shall show no chipping. Taps after testing must be suitable for further work.

4.7. As a cutting fluid for machine threading, a 5% (by weight) solution of emulsol in water is used with a flow rate of at least 5 l / min.

4.6, 4.7. (Changed edition, Rev. N 1).

4.8. Acceptance values ​​of mean time to failure and 95% time should not be less than those indicated in Table 6.

Table 6

Thread size designation	Acceptance values ​​of operating time, pcs. (number of cut holes)

(Changed edition, Rev. N 1, 2).

4.9. The hardness of the taps is measured according to GOST 9013.

4.10. Appearance is controlled by inspection.

4.11. The surface roughness parameters of the taps are checked by comparison with roughness samples according to GOST 9378 or with exemplary tools that have the values ​​​​of the surface roughness parameters specified in clause 2.7, using a magnifying glass LP-1-4 according to GOST 25706.

4.12. When controlling the parameters of taps, methods and measuring instruments should be used, the error of which does not exceed:
when measuring linear dimensions - the values ​​\u200b\u200bspecified in GOST 8.051;
when measuring angles - 35% of the tolerance value for the angle being checked;
when controlling the shape and location of surfaces - 25% of the tolerance value for the parameter being checked.

4.13. Compliance of the parameters of the cut thread with the requirements of clause 2.15 is controlled using conical thread gauges (plugs) in accordance with GOST 6485.

4.9-4.13. (Changed edition, Rev. N 1).

5. TRANSPORT AND STORAGE

Transportation and storage - according to GOST 18088.
Section 5. (Changed edition, Rev. N 2).
Section 6. (Excluded, Rev. N 1).

APPENDIX 1 (recommended). STRUCTURAL ELEMENTS AND GEOMETRIC PARAMETERS OF TAPS

Structural elements and geometric parameters of the taps are indicated in the drawing and in the table.

________________
* Size for reference.

Dimensions in mm

Thread type	Thread size designation	(prev off 14)
Conical inch thread according to GOST 6111-52
Tapered pipe thread according to GOST 6211

Notes:
1. The bottom of the flutes to perform:

for taps for threads -, - - parallel to the generatrix of the cone;

for taps for threads -, - - parallel to the axis of the tap.

2. - the amount of backing is measured by the outer diameter on the cutting part (on the first turn adjacent to the gauge part).

- the amount of backing along the entire profile, measured in the main plane.

3. Core diameter , tooth width and rake angle are given in the main plane.

APPENDIX 1. (Changed edition, Rev. N 1).

APPENDIX 2. (Deleted, Rev. N 1).