Tiêu chuẩn iso 04759 1 2000

Microsoft Word ISO 4759 1 E doc Reference number ISO 4759 1 2000(E) © ISO 2000 INTERNATIONAL STANDARD ISO 4759 1 Second edition 2000 11 15 Tolerances for fasteners — Part 1 Bolts, screws, studs and nu[.]

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Reference numberISO 4759-1:2000(E)

©ISO 2000

Second edition2000-11-15

Tolerances for fasteners —

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Foreword iv

1 Scope 1

2 Normative references 2

3 Tolerances for metric bolts, screws and studs 3

4 Tolerances for metric nuts 25

5 Tolerances for tapping screws 36

Annex A (informative) Tolerances 44

Annex B (informative) Examples of dimensioned and toleranced fasteners 46

Annex C (informative) Examples of gauges and other measuring devices 49

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Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies) The work of preparing International Standards is normally carried out through ISO technicalcommittees Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this part of ISO 4759 may be the subject of patentrights ISO shall not be held responsible for identifying any or all such patent rights

International Standard ISO 4759-1 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee

SC 7, Reference Standards for fasteners (mainly covering terminology, dimensioning, sizes and tolerancing).

This second edition cancels and replaces the first edition (ISO 4759-1:1978), which has been technically revised

ISO 4759 consists of the following parts, under the general title Tolerances for fasteners:

¾ Part 1: Bolts, screws, studs and nuts — Product grades A, B and C

¾ Part 3: Plain washers for bolts, screws ans nuts — Product grades A and C

Annexes A to C of this part of ISO 4759 are for information only

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Tolerances for fasteners —

The tolerances of form and position are specified and indicated in accordance with ISO 1101, ISO 8015 andISO 2692

The tolerances specified in this part of ISO 4759 apply to fasteners prior to coating unless otherwise specified Seealso ISO 4042

Deviations from the tolerances specified in this part of ISO 4759 are only permitted in product standards wherethere are valid technical reasons In cases where there is a difference between the tolerance requirements in thispart of ISO 4759 and the product standard, the product standard takes precedence

It is recommended that these tolerances also be used for non-standard fasteners

Dimensions and tolerances given in this part of ISO 4759 are in millimetres

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ISO 225:1983, Fasteners — Bolts, screws, studs and nuts — Symbols and designation of dimensions.

ISO 286-1:1988, ISO system of limits and fits — Part 1: Bases of tolerances, deviations and fits.

ISO 286-2:1988, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for

holes and shafts.

ISO 885:2000, General purpose bolts and screws — Metric series — Radii under the head.

ISO 965-3:1998, ISO general purpose metric screw threads — Tolerances — Part 3: Deviations for constructional

screw threads.

ISO 1101:2000, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form,

orientation, location and run-out.

ISO 1478:1999, Tapping screws thread.

ISO 1479:1983, Hexagon head tapping screws.

ISO 2692:1988, Technical drawings — Geometrical tolerancing — Maximum material principle.

ISO 4032:1999, Hexagon nuts, style 1 — Product grades A and B.

ISO 4042:1999, Fasteners — Electroplated coatings.

ISO 4757:1983, Cross recesses for screws.

ISO 7053:1992, Hexagon washer head tapping screws.

ISO 7721:1983, Countersunk head screws — Head configuration and gauging.

ISO 8015:1985, Technical drawings — Fundamental tolerancing principle.

ISO 10509:1992, Hexagon flange head tapping screws.

ISO 10642:1997, Hexagon socket countersunk head screws.

ISO 10664:1999, Hexalobular internal driving feature for bolts and screws.

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3.1 Dimensional tolerances

Symbols and designations of dimensions are specified in ISO 225

Tolerance for product grades Feature

closewide

widewide

(but 6g forpropertyclass 8.8and higher)

For certainproducts andcoatings, othertolerance classesfor threads may

be specified in therelevant productand coatingstandards

s Tolerance s Tolerance

u30

> 30

h13h14

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eminapplies butexcluding anychamfer, washerface or radiusspecified in theappropriateproduct standard.The formulae for

to the productsillustrated

aThe symbolkw

replaces thepreviously usedk¢

x is the greater ofcmin´1,25 or cmin+ 0,4

@ is the flange angleDimensionskwa,k,dw,eand@are in accordancewith ISO 225

bFor gauging,see annex A of theproduct standards

Figure 8

Figure 8 a)

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3.1.3.2 Internal

3.1.3.2.1 Hexagon sockets emin= 1,14smin

s Tolerance0,7 EF80,9 JS91,3 K91,5

22,53

D11

Figure 9

568101214

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3.1.3.2.3 Depth of hexagon sockets

and slots

Figure 11

The depth of hexagonsockets and slots isspecified in productstandards only as aminimum It isrestricted by theminimum wallthicknessw

— — For the time being

generallyapplicabletolerances cannot

be specified

3.1.3.2.4 Cross recesses See ISO 4757 for all dimensions except

pen-etration depths For penpen-etration depths seeappropriate product standard

3.1.3.2.5 Hexalobular recesses See ISO 10664 for all dimensions except

pen-etration depths For penpen-etration depths seeappropriate product standard

in accordancewith ISO 7721 orISO 10642

Figure 13

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in accordancewith ISO 7721 orISO 10642

c

Threaddiameter min. max.

3.1.4.3 Bearing face diameter and

height of washer-faced portion

a Reference datum fordw

Figure 16

For productgrade C awasher face isnot mandatory

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Figure 17

dwis defined in product standards only as aminimum

Threaddiameter

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lsis the minimumlength of the un-threaded (plain)shank

lgis the maximumlength of the un-threaded shank(thread run-out in-cluded) and istherefore theminimumclamping length.Tolerance + 2P

related todimensionb

applies onlywherelsandlg

are not specified

in the productstandard

bmrefers to metalend of studsonly

h13 h14 ±IT 15

The tolerance isnot applicable inthe areas of theunderhead filletand threadrun-out

3.1.4.6 Shank diameter

Figure 22

Reduced shank diameter»pitch diameter

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According to ISO 1101 when the datum is the thread axis the letters MD indicate that the datum reference is themajor diameter axis

The maximum material principle in accordance with ISO 2692 is used

Tolerance t for product grades

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3.2.1.1.2 Internal

a 3´simultaneously

Figure 25 3.2.1.2 Tolerances of position

2 IT13 2 IT14 2 IT15 s

a The datum A shall be as close to the head as possible but within 0,5ddistance of the head and shall be either whollyplain or wholly threaded but shall not include the thread run-out or underhead fillet

b MD means that tolerance applies in relation to the axis of the cylinder derived from the major thread diameter

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Feature

Tolerance t

based on dimensions

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Feature

Tolerance t

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2 IT13 2 IT14 2 IT15 d

c PD means that the tolerance applies in relation to the axis derived from the pitch diameter

Figure 40

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Feature

Tolerance t

Notes

d For setscrews

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c See Figure 40

Figure 44

2 IT13 2 IT14 2 IT15 d

IT13 IT14 IT15 d

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Feature

Tolerance t

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22,533,50,08

—

456

3.2.2.3 Tolerance of total run-out

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Feature

Tolerance t

based on dimension

4560,15

In case of flangebolts, tolerancesapply to type Fand type U

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Feature

Tolerance t

Notes

3.2.2.4 Permissible deviation

from the form of bearing face

c radial lines betweenda maxanddw min

d According to product standard

Figure 57

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4.1 Dimensional tolerances

NOTE Symbols and designations of dimensions are specified in ISO 225

closewide

widewide

For all nuts of heightsmW0,8dthe minor diametershall be within the specified tolerances for aminimum of 0,5mmax(only for sizesWM3)

For certainproducts andcoatings, othertolerance classesmay be specified

in the relevantproduct andcoatingstandards

For all nuts of heights 0,5d u m< 0,8dthe minordiameter shall be within the specified tolerancesfor a minimum of 0,35mmax

For prevailing torque type nuts the minor diametermay exceed the specified tolerance for a maxi-mum height of 0,35dfrom the non-restricted endwhich does not contain the prevailing torquefeature

a Profile varies for different types of

prevailing torque type nuts

Figure 58

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Figure 60

See figure 59 See figure 59

4.1.3.2 Width across corners

Figure 61

emin= 1,13smin

Figure 62

emin= 1,3smin

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Prevailing torque type nuts (with

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eminapplies butexcluding anychamfer orwasher facespecified in theappropriateproduct standard.The symbolmw

replaces thepreviously used

Figure 66

w min min b

xis the greater ofcmin´1,25 orcmin+ 0,4

@is the flange angleDimensionsmwa, m,dw, eand @are in accordancewith ISO 225

aThe formulae

apply to theproductsillustrated

bFor gauging,see annex A

of the productstandards

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4.1.4.3 Bearing face diameter

and height of washer-faced portion

0,250,400,500,600,81,0

Figure 67

Figure 68

with product standards

Requirementsapply to bothsides ofsymmetricalparts

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Tiêu đề	Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
Trường học	International Organization for Standardization
Chuyên ngành	Tolerances for fasteners
Thể loại	Standard
Năm xuất bản	2000
Thành phố	Geneva

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Số trang	64
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