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GB/T 14791-2013: Screw threads -- Vocabulary
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Screw threads -- Vocabulary
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Basic data | Standard ID | GB/T 14791-2013 (GB/T14791-2013) | | Description (Translated English) | Screw threads -- Vocabulary | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 21.040.01 | | Word Count Estimation | 35,363 | | Older Standard (superseded by this standard) | GB/T 14791-1993 | | Quoted Standard | ISO 286-1-1988 | | Adopted Standard | ISO 5408-2009, IDT | | Regulation (derived from) | National Standards Bulletin No. 25 of 2013 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the basic terms and their definitions threads. This standard applies to the symmetric and asymmetric screw threads, or cylindrical threaded and tapered threads. When there is more than one corresponds to a definition of the term, s | GB/T 14791-2013: Screw threads -- Vocabulary---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Screw threads. Vocabulary
ICS 21.040.01
J04
National Standards of People's Republic of China
Replacing GB/T 14791-1993
Thread term
(ISO 5408.2009, IDT)
Issued on. 2013-12-17
2014-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 General terms 1
4 and the thread type related terms 4
5 and the thread diameter related terms 9
6 and the thread pitch and lead related terms 12
7 and 14 threads with related terms
8 with the threaded tolerance test and related terms 16
9 and 18 related terms asymmetrical thread
10 and 18 seal pipe thread related terms
11 and 20 thread strength related terms
Appendix A (normative) Additional list of terms 21
French, German, Japanese and Swedish threaded terminology Annex B (informative) equivalent to 22
Pinyin index 27
English equivalents index 29
Foreword
This standard GB/T 1.1-2009 given rule drafting.
This standard replaces GB/T 14791-1993 "threaded term." This standard compared with GB/T 14791-1993, the main technical change
Into.
--- The standard adds 25 new terms. helix lead (3.1.2), spiral lead angle (3.1.3), symmetrical thread (3.2.4), asymmetrically
Thread (3.2.5), the guide thread (3.2.13), the adjacent flank (4.9.1), the same name as the flank (4.9.2), the tooth (4.10), alveolar (4.11),
Alveolar pitch (6.2), the cumulative pitch (6.3), the number of teeth (6.4), alveolar lead (6.6), thread contact height (7.2), fitted long thread
Degree (7.4), alveolar pitch deviation (8.1.2), alveolar lead deviation (8.1.5), the maximum material difference (8.2.1), tolerance code
(8.2.2), reference plane (10.9), to accommodate the length of (10.10), the diameter of the conical taper (10.11), in close distance (10.12), thread tension
Intensity area (11.1), the shear strength of the threaded area (11.2).
--- "Original triangle" "Basic tooth type" relationship with. the 1993 edition of the "original triangle" Export "Basic tooth type" (1993 edition
3.1.2 and 3.1.4); this standard from "Basic tooth type" Export "original triangle" (see 4.1 and 4.5).
--- "Flank" is defined. the 1993 version does not define the shape of the tooth side (the 1993 edition of 3.1.11); this standard is defined in parallel to the axis flank
Rectilinear inner surface (see 4.9).
--- "Functional diameter" is defined.1993 Edition no clear position of the imaginary thread inclusive actual thread (1993 version 3.2.8); this standard
Quasi clearly defined inclusive actual position of the imaginary thread in the thread "flank" Department (see 5.11).
--- "Pitch" is defined. the 1993 measure did not define a position on the pitch (1993 Version 3.3.1) flank; This standard defines spiro
Pitch is the distance between the flank (see 6.1).
--- On the "flank contact height" and "thread contact height" Terminology.1993 Edition no clear distinction between the two terms, only a "connection
Touch height "Terminology (1993 Version 4.1); This standard makes a distinction between the two terms, and gives a clear definition (see 7.1 and 7.2).
--- About "screwed length" and "thread assembly length" terms. the 1993 edition is no clear distinction between the two terms, only a
"Length" terms (1993 edition 4.4); This standard makes a distinction between the two terms, and gives a clear definition (see 7.3 and
7.4).
--- The 1993 edition of "cumulative pitch error" and "lead the accumulated error" terms were changed to "the cumulative pitch deviation" and "cumulative
Lead bias "term; and to redefine the definition (see 8.1.3 and 8.1.7).
--- Revised 1993 edition of "reference diameter" is defined (see 10.4).
--- Use the "pull tight balance" term instead of the 1993 edition of "tightening margin" terms; and delete the definitions of the terms in the 1993 edition of the "minimum
Two entities within the limits thread "and" taper thread "(see 10.8).
This standard uses the translation method identical with ISO 5408.2009 "Thread the term" (in English).
Consistency correspondence with international standards in this standard references of our standards are as follows.
Part 1 (GPS) Limits and fits GB/T 1800.1-2009 Geometrical product specifications. tolerances, deviations and fits the base
Base (ISO 286-1. 1988, MOD)
This standard makes the following editorial changes.
--- Increased the Chinese Pinyin index terms.
--- Modify the title of Appendix B and Table B.1 in the order of content; deleted chapter numbers are listed in the table.
--- Deleted the Chapter 1 (range) on the ISO standard official languages.
--- "Single diameter" is defined. ISO 5408.2009 thread limit measure the axial length within the term defined as an alveolar width,
The most commonly recommended amount behind its definition of the needle (ball volume) measurements contradict; this standard deleted the measure defined within ISO
Limit the amount of content length (see 5.10).
Thread term
1 Scope
This standard specifies the basic terms and their definitions thread.
This standard applies to symmetric and asymmetric screw threaded, or threaded cylindrical and tapered threads.
When there is more than one corresponds to a defined term, preference should be given black bold terms.
Appendix A lists some of the standard text does not give the definition of the term.
With Chinese and English terminology thread equivalent French, German, Japanese and Swedish terminology, see Appendix B.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
ISO 286-1. Section 11988 of the ISO system of limits and fits. tolerances, deviations and infrastructure (ISO systemof fit
limitsandfits-Part 1. Basesoftolerances, deviationsandfits)
3 General terms
3.1 helix
3.1.1
Helix helix
Cylindrical or conical surface along the trajectory of the moving point, axial displacement of the point corresponding to a predetermined angular displacement ratio.
see picture 1.
3.1.2
Helix lead leadofhelix
Ph (metric thread)
L (inch screw threads)
In the same spiral (3.1.1), the same position, corresponding to the axial distance between two adjacent points. That is a point of rotation along the helix
Corresponding week axial distance.
see picture 1.
3.1.3
Helix lead angle leadangleofhelix
φ (metric thread)
λ (inch screw threads)
Helix (3.1.1) the tangent perpendicular to the axis of the helix angle between the planes.
see picture 1.
Note 1. For metric thread, which is calculated as tanφ =
Ph
2πr
; For inch system thread, which is calculated as tanλ =
2πr
Note 2. The conical spiral (3.1.1), spiral lead angle (3.1.3) its axis at different positions are different.
4.12
Crest crest
(4.10) at the top surface of the connection of two adjacent flank (4.9.1) of the tooth.
Figure 12.
4.13
Bottom tooth root
Connecting two adjacent flank (4.9.1) alveolar (4.11) at the bottom surface.
Figure 12.
4.14
Tooth type height threadheight
High tooth
Radial distance from one thread (3.2.1) tooth (4.10) crest (4.12) to its bottom teeth (4.13) between.
Figure 12.
4.15
Crest high addendum
From a thread (3.2.1) tooth (4.10) crest (4.12) in which the radial distance diameters (5.8) between the to.
Figure 10.
4.16
High dedendum bottom teeth
From a thread (3.2.1) tooth (4.10) tooth bottom (4.13) in which the radial distance diameters (5.8) between the to.
Figure 10.
4.17
Flank angle flankangle
β (metric thread)
In the thread type (4.4) on a flank (4.9) and the angle between the plane perpendicular to the axis of the thread between (5.12).
Figure 2, Figure 3 and Figure 12.
Note. inch screw threads, symmetrical thread (3.2.4), code-named the flank angle α, asymmetrical thread (3.2.5), code-named the flank angle α1 and α2.
4.18
Tooth type angle threadangle; includedangle
α (metric thread)
In the thread type (4.4), the angle between two adjacent flank (4.9.1) between.
Figure 2, Figure 3 and Figure 12.
Note. inch screw threads, symmetrical thread (3.2.4) of the tooth-type angle codenamed 2α, asymmetrical thread (3.2.5) of the tooth-type angle codenamed α1 α2.
4.19
Crest arc radius radiusofcrest
In the thread axis (5.12) in the plane, crest (4.12) showed a radius of curvature of the circular arc portion.
4.20
Tooth bottom arc radius radiusofroot
In the thread axis (5.12) plane, the bottom teeth (4.13) showed a radius of curvature of the circular arc portion.
5 and the thread diameter related terms
5.1
Nominal diameter nominaldiameter; nominalsize
Representative thread (3.2.1) size diameter.
Note 1. The fastening screw and screw drive, its large diameter (5.2) represents the size of the basic size of thread. For pipe thread, the nominal pipe size is the representative thread
size.
Note 2. The internal thread, with a diameter of uppercase code (D); the external thread diameter of the lowercase letter code (d).
5.2
Large diameter majordiameter
D4 (metric thread)
With external thread (3.2.6) crest (4.12) or internal thread (3.2.7) tooth bottom (4.13) tangent to imaginary cylindrical or conical diameter.
See Figures 11 and 13.
Note 1. The conical thread (3.2.3), different thread axis (5.12) of the large diameter at the position is different.
Note 2. When the large-diameter internal thread (3.2.7) tooth design type (4.6) is different from the basic large diameter tooth type (4.5) on the design using the large diameter tooth type on behalf of
No. D4.
a thread axis.
b diameter line.
13 Diameter
5.3
Trail minordiameter
D1
d1
d3
With external thread (3.2.6) tooth bottom (4.13) or internal thread (3.2.7) crest (4.12) tangent to imaginary cylindrical or conical diameter.
Figure 10, Figure 11 and Figure 13.
Note 1. The conical thread (3.2.3), (5.12) path at a location different from the thread axis is different.
Note 2. When the minor diameter external thread (3.2.6) tooth design type (4.6) on a path different from the basic tooth type (4.5) on, the design trail use on behalf of the tooth type
No. d3.
5.4
BPD crestdiameter
D1
Crest (4.12) tangent to imaginary cylindrical or conical diameter of the thread (3.2.1).
See Figures 11 and 13.
NOTE. It is the external thread (3.2.6) of large diameter (5.2) or internal thread (3.2.7) trails (5.3).
5.5
Bottom diameter rootdiameter
d1
d3
D4 (metric thread)
Bottom teeth (4.13) tangent to imaginary cylindrical or conical diameter of the thread (3.2.1).
See Figures 11 and 13.
Note 1. It is the external thread (3.2.6) trails (5.3) or internal thread (3.2.7) of large diameter (5.2).
Note 2. When the large-diameter internal thread (3.2.7) tooth design type (4.6) on (5.2) is different from the size of the large diameter of its basic tooth type (4.5) on the large diameter tooth type design on the make
With code D4.
Note 3. When the small-diameter external thread (3.2.6) tooth design type (4.6) on (5.3) is different from the size of its small-diameter basic tooth type (4.5) on the trail on the type of tooth design makes
With code d3.
5.6
Diameter cylindrical pitchcylinder
An imaginary cylinder, the cylinder bus tooth thickness (6.8) by means of threaded barrel (3.2.2) and alveolar width (6.9) equal place.
5.7
Diameter cone pitchcone
An imaginary cone, the cone. (3.2.3) on the tooth thickness (6.8) by a threaded cone and alveolar width (6.9) equal place.
5.8
Diameter line pitchline
Diameter cylinder (5.6) in diameter or cone (5.7) bus.
Figures 10 and 13.
5.9
Diameter pitchdiameter
D2
d2
6.2
Alveolar pitch two-flankpitch
P2
Two adjacent alveolar (4.11) corresponds to the line of symmetry of the axial distance between two points in the radial line (5.8) on. The optimum amount usually used needle or the amount of ball
Measurements.
Figure 16.
Note. Pitch is only available for symmetric alveolar thread (3.2.4), the alveolar (4.11) line of symmetry perpendicular to the axis of the thread (5.12).
6.3
Cumulative pitch cumulativepitch
PΣ
Apart two or more pitch (6.1) two tooth (4.10) and the pitch between each.
6.4
The number of teeth threadsperinch (tpi)
Thread (3.1) pitch (6.1) the number of the axial length of each contained 25.4mm.
NOTE. This term is mainly used for inch screw threads. The number of teeth is the reciprocal value of the inch pitch.
6.5
Lead lead
Ph (metric thread)
L (inch screw threads)
Closest two namesake flank (4.9.2) with a diameter line (5.8) intersect the axial distance between two points.
See Figure 17.
NOTE. Lead is a point along the corresponding axial displacement of helix rotation on (3.1.1) in diameter column (5.6) in diameter or cone (5.7).
17 Lead and lead alveolar
6.6
Alveolar lead two-flanklead
Ph2
Two nearest neighbor in the same line of symmetry alveolar alveolar (4.11) in the corresponding axial distance between two points in the radial line (5.8) on. usually
The optimum amount of needle use or amount of the ball is measured.
See Figure 17.
NOTE. alveolar lead only applies to symmetrical threads (3.2.4), the alveolar (4.11) line of symmetry perpendicular to the axis of the thread (5.12).
6.7
Lead angle leadangle
Lead angle
φ (metric thread)
λ (inch screw threads)
In diameter column (5.6) in diameter or cone (5.7) in the thread axis angle between the plane of the spiral (3.1.1) with the vertical tangent (5.12).
Note 1. For metric thread, which is calculated as tanφ =
Ph
πd2
; For inch system thread, which is calculated as tanλ =
πd2
Note 2. conical thread (3.2.3), their different thread axis (5.12) L angular position is different.
6.8
Teeth thick ridgethickness
A tooth (4.10) adjacent flank (4.9.1) with a diameter line (5.8) intersect the axial distance between two points.
6.9
Alveolar wide groovewidth
A alveolar (4.11) adjacent flank (4.9.1) with a diameter line (5.8) intersect the axial distance between two points.
7 threaded engagement with related terms
7.1
Flank contact height flankoverlap; depthofthreadengagement
H1
In two coaxial mating threads (3.2.1) tooth type (4.4) on its flank (4.9) coincides with the radial height portion.
See Figures 11 and 18.
Explanation.
1 --- internal thread;
2 --- external thread.
18 thread contact height and flank contact height
7.2
Thread contact height threadoverlap
H0
In two coaxial mating threads (3.2.1) tooth type (4.4), the external thread (3.2.6) crest (4.12) to the inner diameter of the thread crest between (3.2.7)
The distance, that is within the outer thread (3.2.6; 3.2.7) of the tooth-type overlapping radial height.
See Figures 11 and 18.
7.3
Screwed length lengthofthreadengagement
lE
(10.3) contact with each other axial length of the two mating thread (3.2.1) Effective thread.
Figure 15 and 19.
Explanation.
1 --- internal thread;
2 --- external thread.
Figure 19 is screwed assembly length and thread length
7.4
Threaded mounting length lengthofassembly
lA
(3.2.1) screwed the axial length of the two mating threads.
Figure 19.
Note. threaded mounting length allowed to contain lead thread (3.2.13) chamfering and (or) threaded closure (3.2.12).
7.5
Large diameter gap majorclearance
ac1
In the design tooth type (4.6), the radially inner threaded coaxial assembly (3.2.7) tooth bottom (4.13) and the external thread (3.2.6) crest (4.12) between the
distance.
Figure 11.
7.6
Trail gap minorclearance
ac2
In the design tooth type (4.6), the radially inner threaded coaxial assembly (3.2.7) crest (4.12) and the external thread (3.2.6) tooth bottom (4.13) between the
distance.
Figure 11.
7.7
Travel kinematictravel; kinematicpath
Two mating thread (3.2.1) the relative axial displacement relative rotational angle of a generated. This term is often used for transmission thread.
See Figure 20.
a trip.
b angle of rotation.
Figure 20 stroke
8 with the threaded tolerance test and related terms
8.1 pitch, lead, flank angle and its diameter equivalent
8.1.1
Pitch deviation pitchdeviation
ΔP
Pitch (6.1) of the actual value of the difference between its basic values.
8.1.2
Alveolar pitch deviation two-flankpitchdeviation
ΔP2
Alveolar pitch (6.2) of the actual value of the difference between its basic values.
8.1.3
Cumulative pitch deviation cumulativepitchdeviation
ΔPΣ
Within the specified thread (3.2.1) the length of the actual cumulative tooth pitch of any two (4.10) between (6.3) the value of their underlying value of the accumulated pitch
The biggest difference between the absolute value of the deviation.
See Figure 21.
NOTE. In some cases, the length of the thread of this provision may be screwed length (7.3). For pipe thread, thread length of this provision may be 25.4mm.
21 cumulative pitch deviation
8.1.4
Lead deviation leaddeviation
ΔPh (metric thread)
ΔL (inch screw threads)
Lead (6.5) of the actual value of the difference between its basic values.
8.1.5
Alveolar lead deviations two-flankleaddeviation
ΔPh2
Alveolar lead (6.6) of the actual value of the difference between its basic values.
8.1.6
Stroke deviation kinematictraveldeviation
The basic difference between the actual value of its stroke (7.7) in.
8.1.7
Cumulative lead deviation cumulativeleaddeviation
ΔPhΣ
Within a specified thread length, the same spiral face any two flank (4.9) and the radial line (5.8) intersects the actual axial distance between two points
The basic difference between the value of its maximum absolute value of the deviation.
See Figure 22.
NOTE. In some cases, the length of the thread of this provision may be screwed length (7.3). For pipe thread, thread length of this provision may be 25.4mm.
22 cumulative lead error
8.1.8
Flank angle deviation flankangledeviation
Δβ (metric thread)
Flank angle (4.17) of the actual value of the difference between its basic values.
8.1.9
Diameter equivalent pitchdiameterequivalent
By a pitch deviation (8.1.1) or lead deviation (8.1.4) and (or) flank angle deviation (8.1.8) the functional diameter (5.11) of the amount caused by the change.
Measurements typically utilize thread gauge indicating the differential test.
Note 1. External thread (3.2.6), wherein the equivalent diameter is positive; internal thread (3.2.7), wherein the equivalent diameter is negative.
Note 2. The "equivalent diameter" can also be broken down into "pitch deviation equivalent diameter" and "flank angle deviation in equivalent diameter."
8.2 inch screw threads
8.2.1
The maximum difference alowance entity
Internal thread (3.2.7) of the maximum diameter of the outer thread entity (3.2.6) corresponding to the difference between the maximum diameter of the entity.
Note 1. For a clearance fit inch screw threads, the largest entity equal to the absolute value of the difference between the basic bias.
Note 2. For a clearance fit inch screw threads, the biggest difference is the entity with the minimum gap between the threads (positive); for interference fit inch screw threads, the largest entity difference
Is the maximum amount of thread interference fit between the (negative).
8.2.2
Tolerance code classofthread
Tolerance of numbers and letters that is marked by the code, indicating the location of standard tolerance grades and thread.
9 and asymmetrical thread related terms
9.1
Bearing flank loadflank
Deputy in the external thread withstand axial load flank (4.9).
9.2
Non-bearing flank clearanceflank
Deputy thread is not subjected to an external axial load flank (4.9).
9.3
Guide flank leadingflank
When the thread is about to assemble, with the face of its thread flank of the workpiece (4.9).
9.4
Follow flank folowingflank
When the thread is about to assemble, with his back to its flank threaded workpiece (4.9).
10 and the seal pipe thread related terms
10.1
Complete thread completethread
Crest (4.12) and bottom teeth (4.13) has a threaded complete shape (3.2.1).
See Figure 23.
NOTE. When the guide thread (3.2.13) of the axial length of the chamfer pitch no more than one (6.1), this is included in the complete guide screw thread length.
10.2
Incomplete thread incompletethread
Bottom teeth (4.13) form a complete crest (4.12) due to the intersection of the cylindrical surface of the workpiece shape of incomplete thread (3.2.1).
See Figure 23.
10.3
Effective thread usefulthread; effectivethread
The complete thread (10.1) and incomplete thread (10.2) composed of threads (3.2.1). It does not contain pintail (3.2.12).
See Figure 23.
10.6
Reference distance gaugelength
Substrate distance
The axial distance from the reference plane (10.5) into the conical external threads (3.2.3,3.2.6) small end face.
See Figure 23.
10.7
Assembly margin fittingalowance
In the conical outer thread (3.2.3,3.2.6) effective thread reference plane (10.5) after (10.3) length. It provides a minimum physical shape
In the state assembly of that thread (3.2.7) in.
See Figure 23.
10.8
Wrenching margin wrenchingalowance
Hands screwed wrench required for effective thread (10.3) length. When wrenching, it accommodates relative motion between two mating threads of the workpiece.
See Figure 23.
10.9
Reference plane referenceplane
When the test thread (3.2.1), the workpiece thread gauge reading test values \u200b\u200b(position deviation reference plane) referenced visible end face.
See Figure 23.
NOTE. It is an internal thread (3.2.7) or large end externally threaded workpiece (3.2.6) of small parts of the end face.
10.10
Accommodate the length accommodationlength
From the large end internal thread (3.2.7) to interfere with an external thread (3.2.6) pull the axial distance between the first obstacle encountered screwed tight between.
10.11
Diameter conical taper taperofpitchcone
Taper taperofthread
In diamet...
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