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1、BRITISH STANDARD
BS EN
14399-10:2009
High-strength
structural bolting assemblies for preloading
Part 10: System HRC — Bolt and nut assemblies with calibrated preload
ICS 21.060.01
2、
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
BS EN 14399-10:2009
National foreword
This British Standard is the official English language version of EN 14399–10:2009. Together with BS EN 14399 Parts 1-8, it supersedes BS 4395-1:1969 and BS 4395-2:1969 which
3、 were declared obsolescent in 2007. (BS 4395-1:1969 and BS 4395-2:1969, along with BS 4604-1:1970 and BS 4604-2:1970, currently support BS 449 and BS 5950.)
The BS EN 14399 series of standards comprise ten parts.
BS EN 14399–1:2005 provides the general and harmonization requirements to which th
4、e other parts, which provide specific requirements regarding manufacture, materials and testing, relate.
Following the agreement to extend the period of co-existence to two years for BS EN 14399 Parts 1 to 6, CEN/TC 185/WG 6 applied for
and received approval for the same extension to be applied
5、 to all other structural bolting standards.
BS EN 14399–10:2009 is only manufactured to property class 10.9 and has been designed to generate the same axial tensile loads as
BS EN 14399–3:2005 property class 10.9. Although known as ‘Tension Control bolts’ this system depends on accurate control
6、of the assembly’s ‘Torque–Tension’ characteristics to achieve the specified axial tensile loads.
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immun
7、ity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2009
? BSI 2009
ISBN 978 0 580 58981 2
Amendments/corrigenda issued since publication
Date
8、 Comments
EUROPEAN STANDARD NORME EUROPéENNE
EUROP?ISCHE NORM
EN 14399-10
March 2009
ICS 21.060.01
English Version
High-strength structural bolting assemblies for preloading - Part
10: System HRC - Bolt and nut assemblies with calibrated preload
Boulonne
9、rie de construction métallique à haute résistance apte à la précontrainte - Partie 10: Système HRC - Boulons (vis + écrou + rondelle) à précontrainte calibrée
Hochfeste planm??ig vorspannbare Schraubenverbindungen für den Metallbau - Teil 10: System HRC - Garnituren aus Schrauben und Muttern mit k
10、alibrierter Vorspannung
This European Standard was approved by CEN on 24 January 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-
11、date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation un
12、der the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gre
13、ece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION C OM I Té EUR OP éEN
14、 DE NOR M AL I S ATI ON EUR OP ?I S C HES KOM I TEE F üR NOR M UNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
? 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. EN 14399-10:2009: E
15、
Contents Page
Foreword..............................................................................................................................................................4
Introduction .........................................................................................
16、................................................................5
1 Scope ......................................................................................................................................................6
2 Normative references .............................................
17、...............................................................................6
3 Terms and definitions ...........................................................................................................................7
4 Bolts ........................................................
18、................................................................................................7
4.1 Dimensions of bolts ...............................................................................................................................7
4.2 Specification for bolts and reference stand
19、ards ............................................................................. 12
4.3 Marking of bolts .................................................................................................................................. 12
5 Nuts ................................................
20、...................................................................................................... 13
5.1 Dimensions of nuts............................................................................................................................. 13
5.2 Specification for nuts and reference
21、standards .............................................................................. 15
5.3 Proof load values of nuts ................................................................................................................... 15
5.4 Decarburization of the nut thread ...................
22、.................................................................................. 16
5.5 Marking of nuts ................................................................................................................................... 16
6 Designation of the bolt/nut assembly.................
23、.............................................................................. 17
7 Associated washers ........................................................................................................................... 17
8 Functional characteristics of the bolt/nut/washer assembly ...
24、...................................................... 18
8.1 General................................................................................................................................................. 18
8.2 Suitability test for preloading ............................................
25、................................................................ 18
8.3 Suitability test for calibrated preload ............................................................................................... 18
8.4 Requirements ......................................................................
26、................................................................ 19
Bibliography ..................................................................................................................................................... 21
Figures
Figure 1 — Bolt HRC with hexagon head ...
27、..................................................................................................... 8
Figure 2 — Bolt HRC with cup head ................................................................................................................ 9
Figure 3 — Examples for bolt marking ....
28、...................................................................................................... 13
Figure 4 — Dimension of the nut ................................................................................................................... 14
Figure 5 — Examples for nut marking .
29、.......................................................................................................... 17
Tables
Table 1 — Dimensions of hexagon bolts a .......................................................................................................9
Table 2 — Dimensions of
30、 cup head bolts a b .................................................................................................11
Table 3 — Dimensions of spline-end a ...........................................................................................................11
Table 4 — Specifications f
31、or bolts and reference standards.......................................................................12
Table 5 — Dimensions of nuts according to EN 14399-3:2005 (HR) a .........................................................14
Table 6 — Dimensions of nuts with height m = 1 d (HRD) a.......
32、...................................................................15
Table 7 — Specifications for nuts and reference standards........................................................................15
Table 8 — Proof load values of nuts ........................................................
33、......................................................16
Table 9 — Limiting values of bolt force at the fracture of the spline-end ..................................................20
Foreword
This document (EN 14399-10:2009) has been prepared by Technical Committee CEN/TC
34、 185 “Fasteners”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2009, and conflicting national standards shall be withdrawn a
35、t the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
EN 14399 consists of the following parts, under the general tit
36、le High-strength structural bolting assemblies for preloading:
? Part 1: General requirements
? Part 2: Suitability test for preloading
? Part 3: System HR - Hexagon bolt and nut assemblies
? Part 4: System HV - Hexagon bolt and nut assemblies
? Part 5: Plain washers
? Part 6
37、: Plain chamfered washers
? Part 7: System HR - Countersunk head bolt and nut assemblies
? Part 8: System HV - Hexagon fit bolt and nut assemblies
? Part 9: System HR or HV – Direct tension indicators for bolt and nut assemblies
? Part 10: System HRC - Bolt and nut assemblies with ca
38、librated preload
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icela
39、nd, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This part of this European Standard completes the series of European standards EN 1439
40、9 parts 1 to 10 which specify high-strength structural bolting for preloading; it belongs to the system HR. The specificity of bolt and nut assemblies with a calibrated preload, compared with the system HR as defined in EN 14399-3, is the preload in the bolt which is controlled during tightening by
41、the fracture of the spline-end of the bolt under torsional stress, this fracture occurring for a precise predetermined stress.
Preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication. Therefore it is important that the assembly is supplied by one manufacturer
42、who is always responsible for the function of the assembly.
For the same reason it is important that the coating of the assembly is under the control of the manufacturer. Besides the mechanical properties of the components, the functionality of the assembly requires that the
specified preload can
43、be achieved when the fracture of the break neck at the spline-end of the bolt occurs
under the predetermined torsional stress when the assembly is tightened with the appropriate procedure. For this purpose a test method for the suitability of the components for preloading was created which
44、will demonstrate whether the function of the assembly is fulfilled.
It should be pointed out that, compared to ISO 272, the widths across flats (large series) for M12 and M20 have been changed to 22 mm and 32 mm respectively. These changes are justified by the following reasons:
? under the s
45、pecific conditions of structural bolting the compressive stresses under the bolt head or nut for the sizes M12 may become too large with the width across flats of 21 mm, especially if the washer is fitted eccentrically to the bolt axis;
? for the size M20 the width across flats of 34 mm is very
46、difficult to be produced; the change to 32 mm is primarily motivated by economics but it should also be pointed out that the width across flats of 32 mm is already common practice in Europe.
1 Scope
This part of this European Standard specifies, together with EN 14399-1, the requirem
47、ents for assemblies of high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head (large widths across flats) or cup head, thread sizes M12 to M30 and property class 10.9/10.
Bolt and nut assemblies conforming to this part of this European Standard have
48、 been designed to allow preloading of at least 0,7 fub ′ As 1) according to EN 1993-1-8:2005 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics:
? nut according to EN 14399-3,
49、 or
? nut with height m = 1 d,
? thread length of the bolt according to ISO 888.
Bolt and nut assemblies conforming to this part of this European Standard include washer(s) according to
EN 14399-6 or to EN 14399-5 (under the nut only).
NOTE Attention is drawn to the importance of ensu
50、ring that the bolts are correctly used if a satisfactory result is to be obtained.
The test method for suitability for preloading is specified in EN 14399-2 and in Clause 8.
2 Normative references
The following referenced documents are indispensable for the application of this document.
51、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10045-1, Metallic materials – Charpy impact test – Part 1: Test method
EN 14399-1, High-strength structural bolting assemblies for
52、 preloading – Part 1: General requirements
EN 14399-2:2005, High-strength structural bolting assemblies for preloading – Part 2: Suitability test for preloading
EN 14399-3:2005, High-strength structural bolting assemblies for preloading – Part 3: System HR – Hexagon bolt and nut asse
53、mblies
EN 14399-5, High-strength structural bolting assemblies for preloading – Part 5: Plain washers
EN 14399-6, High-strength structural bolting assemblies for preloading – Part 6: Plain chamfered washers
EN 20898-2, Mechanical properties of fasteners – Part 2: Nuts with specified proof l
54、oad values – Coarse thread (ISO 898-2:1992)
EN 26157-1, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements
(ISO 6157-1:1988)
EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs (ISO
55、 898-1:1999)
1) fub is the nominal tensile strength (Rm) and As the stress area of the bolt.
EN ISO 3269, Fasteners – Acceptance inspection (ISO 3269:2000)
EN ISO 4759-1, Tolerances for fasteners – Part 1: Bolts, screws, studs and nuts – Product grades A, B and C (ISO 4759-
56、1:2000)
EN ISO 6157-2, Fasteners – Surface discontinuities – Part 2: Nuts (ISO 6157-2:1995)
EN ISO 10684, Fasteners – Hot dip galvanized coatings (ISO 10684:2004)
ISO 148-1, Metallic materials – Charpy pendulum impact test – Part 1: Test method
ISO 261, ISO general purpose metric screw t
57、hreads – General plan
ISO 965-2, ISO general purpose metric screw threads – Tolerances – Part 2: Limits of sizes for general purpose external and internal screw threads – Medium quality
ISO 965-5, ISO general purpose metric screw threads – Tolerances – Part 5: Limits of sizes for internal scre
58、w threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
shear wrench
electric or manual tool equipped with tw
59、o co-axial sockets which react by torque one against the other:
? the outer socket which engages the nut rotating clockwise;
? the inner socket which engages the spline-end of the bolt (i.e. bi-hexagonal) rotating anticlockwise
NOTE The shear wrench operates as follows:
? during the ti
60、ghtening operation of an assembly, the socket in rotation is the one that finds the least resistance to it;
? from the outset and right up to the final tightening stage, the outer socket on the nut rotates clockwise while the inner socket holds the spline-end without rotating, the result being th
61、at the bolt assembly is progressively tightened by the increasing torque applied to the nut;
? at the final stage of tightening, i.e. when the torsional resistance plateau of the break-neck section is attained, the inner socket rotates anticlockwise while the outer socket on the nut provides the
62、 reaction without rotating;
? the bolt assembly installation is complete when the spline-end shears off at the break-neck section.
4 Bolts
4.1 Dimensions of bolts
See Figures 1 and 2. Dimensions of bolts are in accordance with the relevant dimensions specified in
EN
63、14399-3:2005, see Tables 1 and 2. Dimensions of the spline-end are specified in Table 3.
Key
a Incomplete thread u ￡ 2 P
b 15° to 30°
NOTE The difference between lg and ls should not be less than 1,5 P.
Figure 1 — Bolt HRC with hexagon head
Key
a Incomple
64、te thread u ￡ 2 P
NOTE The difference between lg and ls should not be less than 1,5 P.
Figure 2 — Bolt HRC with cup head
Table 1 — Dimensions of hexagon bolts a
Dimensions in millimetres
Thread d
M12
M16
M20
M22
M24
M27
M30
P b
1,75
2
2,5
2,5
3
3
3,5
b (ref.
65、)
c
30
38
46
50
54
60
66
d
—
44
52
56
60
66
72
e
—
—
65
69
73
79
85
c
max.
0,8
0,8
0,8
0,8
0,8
0,8
0,8
min.
0,4
0,4
0,4
0,4
0,4
0,4
0,4
da
max.
15,2
19,2
24,4
26,4
28,4
32,4
35,4
ds
max.
12,70
16,70
20,84
22,84
24,84
27,84
30,84
min.
1
66、1,30
15,30
19,16
21,16
23,16
26,16
29,16
dw
max.
f
min.
20,1
24,9
29,5
33,3
38,0
42,8
46,6
e
min.
23,91
29,56
35,03
39,55
45,20
50,85
55,37
k
nom.
7,5
10
12,5
14
15
17
18,7
max.
7,95
10,75
13,40
14,90
15,90
17,90
19,75
min.
7,05
9,25
11,60
13,10
14,10
16,10
17,65
kw
min.
4,9
6,5
8,1
9,2
9,9
11,3
12,4
r
min.
1,2
1,2
1,5
1,5
1,5
2,0
2,0
s
max.
22
27
32
36
41
46
50
min.
21,16
26,16
31
35
40
45
49
Ta
【bs英國(guó)標(biāo)準(zhǔn)】bs en 1439910 highstrength structural bolting assemblies for preloading part 10 system hrc — bolt and nut assemblies with calibrated preload
