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1、J IS JAPANESE IN DUSTRIAL STANDARD Translated and Published by Japanese Standards Association JIS B 1052 : 1998 Mechanical properties of steel nuts ICs 21.060.20 Descriptors : nuts, internal threads, mechanical testing, unalloyed steels, alloy Reference number : JIS B 1052 : 1998 (E) steels, steels,
2、 mechanical behaviour of materials 22 s STD-JIS B 1052-ENGL 1178 = Y33bOCI 0550322 588 EI B 1052:1998 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial St
3、andards Committee in accordance with the Industrial Standardization Law. Consequently, JIS B 1052:1991 is replaced with JIS B 1052:1998. Date of Establishment: 1972-06-01 Date of Revision: 1998-01-20 Date of Public Notice in Official Gazette: 1998-01-20 Investigated by: Japanese Industrial Standards
4、 Committee Divisional Council on Machine Elements JIS B 1052:1998, First English edition published in 1998-05 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be
5、 the final authority. 1 r ? 9 i O JSA 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed
6、 in Japan -,-,- ? JAPANESE INDUSTRIAL STANDARD JIS B 1052: 1998 Mechanical properties of steel nuts Introduction Annex 1 and Annex 2 of this Standard have been prepared on the basis of IS0 898-2, Mechanical properties of fasteners - Part 2: Nuts with specified proof load values - Coarse thread, publ
7、ished as the second edition in 1992 and IS0 898-6, Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread, published as second edition in 1994, without making any modification on the technical contents. Annex 3, specified the mechanical properties of s
8、teel nuts classes 4T to 12T not specified in the corresponding International Standards, will be expired on 31st December 2000. Among the descriptions of Annexes 1 and 2, dot underlined Remarks and Informative references are not contained in the based International Standards. 1 Scope This Japanese In
9、dustrial Standard specifies mechanical properties of steel nuts. 2 Mechanical property 2 . 1 05 and 4 to 12 shall be according to Annex 1 (normative). The mechanical property for steel nuts (Coarse thread) of property classes 04, 2.2 04, 05 and 5 to 12 shall be according to Annex 2 (normative). The
10、mechanical property for steel nuts (Fine pitched thread) of property classes 2 . 3 of property classes 4T to 12T shall be according to Annex 3 (normative). The mechanical property for steel nuts (Coarse thread and fine pitched thread) STD-JIS B i052-ENGL 1998 4933b08 055U324 350 Thread greater less
11、than than or equal to - M2.5 Xl2.5 M 7 $1 7 M 16 $1 16 $139 2 B 1052 : 1998 Test load 9 6 Thread tolerances 7H bG 6H 100 _. 95.5 100 05.3 97 100 16 97.5 100 98 98.5 Annex 1 (normative) Nuts with specified proof load values - Coarse thread 1 This Annex 1 specifies the mechanical properties of nuts wi
12、th specified proof load values (coarse thread) when tested at room temperature. Properties will vary at higher and lower temperature. Scope It applies to nuts - with nominal thread diameters up to and including 39 mm; - with diametedpitch combinations according to JIS B 0205; - with thread tolerance
13、s 6H according to JIS B 0209; - with specific mechanical requirements; - with widths across flats as specified in JIS B 1002 (excluding those meshed - with nominal heights greater than or equal to 0.5d; - made of carbon steel or low alloy steel. It does not apply to nuts requiring special properties
14、 such as - locking abilities (see JIS B 1056); - weldability; - corrosion resistance (see JIS B 1054); - ability to withstand temperatures above +300 O C or below -50 O C . Remarks 1 Nuts made from free-cutting steel should not be used above +250 O C . 2 For special products such as nuts for high-st
15、rength structural bolting, and overtapped nuts for use with hot-dipped galvanized bolts, see the product standards for appropriate values. 3 For assemblies with threads having tolerances wider than 6W6g, there is an increased risk of stripping (see Annex 1 Table i). half-tone dot); Annex 1 Table 1 R
16、eduction in thread strength 1 V 1 -,-,- ? , 1 4 In the case of thread toleranc m 11 ri 3 3 bu H s other or larg 05.511325 277 m 3 B 1052 : 1998 r than 6H, a decrease of the stripping strength should be considered (see Annex 1 Table 1). -,-,- STDOJIS B - with diametedpitch combinations in accordance
17、with JIS B 0207; - with thread tolerances 6H in accordance with JIS B 0211; - with specific mechanical requirements; - with widths across flats as specified in JIS B 1002 (excluding those meshed - with nominal heights greater than or equal to 0.5d; - made of carbon steel or alloy steel (see Remarks
18、1). It does not apply to nuts requiring special properties such as - locking ability (see JIS B 1056); - weldability; - corrosion resistance (see JIS B 1054); - ability to withstand temperatures above +300 “C or below -50 “C. (however, see Remarks 1). Remarks 1 Nuts made from free-cutting steel shou
19、ld not be used above +250 “C. With thread tolerances other or larger than 6H, a decrease in the stripping strength should be considered (see Annex 2 Table 1). by half-tone dot); 2 -,-,- 24 B 1052 : 1998 d mni Annex 2 Table 1 Reduction in thread strength 6H 7H 6G Test load % thread 2 Normative refere
20、nces The following standards contain provisions which, through reference in this Annex 2, constitute provisions of this Annex 2. The most recent editions of the standards indicated below shall be applied. JIS B 0207 Metric fine screw threads , - screw threads -General plan, IS0 262: 1973, IS0 genera
21、l purpose metric screw threads - Selected sizes for screws. bolts and nuts and _- Remarks: The cited provisions from IS0 965-1: 1980, IS0 general purpose metric screw threads - Tolerances - Part 1: Principles and basic data and IS0 965-2: 1980. IS0 general wurwose metric screw threads - _ . -_- - -_
22、- v da : the minor diameter of the external thread; di* : the basic minor diameter of the external thread; H : the height of the fundamental triangle of the thread. Note*: dl and dz are in accordance with JIS B 0207. 28 B 1052 : 1998 STDmJIS B 1052-ENGL 1778 W 4733b08 0550350 LILii?. W a r 3 ri: * s
23、 - a u: c fl c o) h t; - Y z 0 m Y t; h e l v s z W 2 c ; ; - s - U ?i N 2 cv m I,.,., ,. -,-,- STD-JIS B L052-ENGL 1978 I 4933b08 0550353 387 I I 29 B 1052 : 1998 8 gil a li1 r - i - m b e r - om0 - 0 2 I ! Il! N i - C O ses? li 8 8 8 Lr; 2 2 e Lfl - - I a 8 8 3 t - 3 a t - i - m m me = 8 Q 8 a a 2
24、 2 % 8 3 E iam -am N m Lr) m a s ! m C C m i - e m NSJ N N O l xxx em xxx x x x C O O Z S E E xxx 2 z z z z z xxx B 8 M S E E arna E E E m m m -,-,- 30 B 1052 : 1998 6.8 7 Failure loads for nuts with nominal heights of 1O.W and c0.W (Thin nut) The values of failure loads given for guidance in Annex
25、2 Table 7 apply to different bolt classes. Bolt stripping is the expected failure mode for lower strength bolts, while nut stripping can be expected for bolts of higher property classes. 8.8 10.9 12.9 Annex 2 Table 7 Minimum stripping strength of nuts (percentage to the proof load of bolts) O4 O5 Mi
26、nimum stripping strength proof load of bolts) Property lass Of of nuts (percentage to the I the nut 85 65 45 40 100 85 60 50 I I I I I Property classes I 8 Test methods 8.1 Proof load test The proof load test shall be used wherever the capacity of available testing equipment permits, and shall be th
27、e referee method for conforming to Annex 2. The nut shall be assembled on a hardened and threaded test mandrel as shown in Annex 2 Fig. 1 and Annex 2 Fig. 2. For referee purposes, the axial tensile test is decisive. The proof load shall be applied against the nut in an axial direction as shown in An
28、nex 2 Table 6, and shall be held for 15 s. The nut shall resist the load without failure by stripping or rupture, and shall be removable by the fingers after the load is released. If the thread of the mandrel is damaged during the test, the test should be discarded. It may be necessary to use a manu
29、al wrench to start the nut in motion. Such wrenching is permissible provided that it is restricted to one half turn and that the nut is then removable by the fingers. The test mandrel shall be hardened to 45 HRC minimum, and threaded to tolerance class 5h6g. Excepting that the tolerance of the major
30、 diameter shall be the last quarter of the 6g range on the minimum material side. Informative reference: The thread tolerances of test mandrel for nominal diameter 8 mm to 39 mm are shown in Annex 2 Informative Table 1. _-_-_-_-. 31 B 1052 : 1998 i 1 I- i Load *) D11 is taken from JIS B 0401. Annex
31、2 Fig. i Axial tensile test 1 Load I rl Annex 2 Fig. 2 Axial compressive test 8.2 Hardness test For routine inspection, hardness tests shall be carried out on one bearing surface of the nut and the hardness shall be taken as the mean of three values spaced 120“ apart, In case of dispute, the hardnes
32、s tests shall be carried out on a longitudinal section through the nut axis and with impressions placed as close as possible to the nominal major diameter of the nut thread. The Vickers hardness test is the referee test whether the specimen conform to Annex 2 Table 5 and where practicable a load of
33、HV 30 shall be applied. If Brinell or Rockwell hardness tests are applied, the effects shall be converted into Vickers values. The Vickers hardness test shall be carried out in accordance with the requirements of JIS Z 2244. The Brinell hardness test shall be carried out in accordance with the requi
34、rements of JIS Z 2243. The Rockwell hardness test shall be carried out in accordance with the requirements of JIS Z 2245. 8 . 3 Surface integrity test For the surface integrity test, see JIS B 1042. -,-,- 32 B 1052 : 1998 Designation I symbol 9 Marking 5 6 8 10 12 9.1 Symbols Marking symbols are sho
35、wn in Annex 2 Tables 8 and 9. . . - I - b n . : O; 2 2 i Annex 2 Table 8 Marking for nuts with property classes in accordance with 3.1 Code symbol (Clock-face system) Property class Designation symbol Marking position o4 O5 o4 O3 I Note (*) The code symbol of dot at 12 oclock position shall not be a
36、ltered by the manufacturers mark. I Annex 2 Table 9 Marking for nuts with property classes in accordance with 3.2 9.2 Nut products of all property classes shall be marked with the designation symbols described in clause 9.1, by indenting on the side or bearing surface, or by embossing on the chamfer
37、, as examples shown in Annex 2 Figs. 3 and 4. Embossed marks shall not protrude beyond the bearing surface of the nut. Marking on products Marking dot may be replaced by manu- facturers mark here Annex 2 Fig. 3 Examples of Annex 2 Fig. 4 Examples of marking marking with with code symbol designation
38、symbol (clock-face system) -,-,- 33 B 1052 : 1998 9.3 Marking of left-hand thread Nuts with left-hand thread shall be marked with an arrow as shown in Annex 2 Fig. 5 on one bearing surface of the nut by indenting. The alternative marking of signs as shown in Annex 2 Fig. 6 may also be used. +;+ I) s
39、=width across flats Annex 2 Fig. 5 Left-hand thread Annex 2 Fig. 6 Alternative left- marking hand thread marking 9.4 9.1 to 9.3, is left to the choice of the manufacturer. Alternative marking Alternative or optional permitted marking as stated in 9.5 Trade (identification) marking The trade (identif
40、ication) marking of the manufacturer is mandatory on all products covered by the obligatory marking requirements for property classes, provided this is possible for technical reasons. Packages, however, shall be marked in all cases. -,-,- STD-JIS B 1052-ENGL 1478 Li733bUB 055U35b 7b0 34 B 1052 : 199
41、8 Annex 2 Informative Table 1 Thread tolerances of test mandrel Unit: mm _ Pitch diameter Pitch Major diameter Thread 8 10 10 12 12 14 16 18 18 20 20 22 22 24 27 30 33 36 39 Max. Max. Min. Min. 7.260 9.260 9.093 7.350 9.350 9.188 11.188 11.026 13.026 7.839 9.839 9.813 11.813 11.791 13.791 7.794 9.79
42、4 9.760 11.760 11.732 13.732 1 1 1.25 1.25 1.5 1.5 1 1 .O82 10.914 12.913 1.5 1.5 2 15.026 17.026 16.701 15.732 17.732 17.682 19.732 19.682 21.732 14.914 16.914 16.576 18.915 18.576 20.914 15.791 17.791 17.752 19.791 19.752 21.791 19.026 18.701 21.026 1.5 2 1.5 21.752 23.752 26.152 29.752 32.752 35.
43、670 38.670 _- - 21.682 23.682 26.682 20.576 21.569 23.569 20.701 22.701 25.701 28.101 31.701 34.05 1 29.682 32.682 35.577 28.569 31.569 33.891 2 2 3 3 38.57 37.051 36.891 -,-,- 35 B 1052 : 1998 Annex 3 (normative) Nuts for property classes 4T to 12T 1 This Annex 3 specifies the mechanical property a
44、nd the test, inspection and marking of nuts with property classes 4T to 12T (Coarse thread and fine pitched thread). This Annex 3 applies to nuts which comply with the followings: Scope Type of nuts Nuts, such as hexagonal nuts, square nuts, slotted nuts, cap nuts and round nuts, required the mechan
45、ical properties irrespective of the shape. Threads Nuts with threads of basic profile, nominal diameter and pitch as specified in JIS B 0205 and JIS B 0207. Nominal diameter of thread Nuts with a nominal diameter of 2 mm to 39 mm. Width across flats or outer diameter, and effective length of thread
46、Nuts with a width across flats or outer diameter 21.45 nominal diameter, dP), and an effective length of thread 20.62. Note (l) It may also apply to nuts with the dimension 1,45d, if required. Remarks 1 This Annex 3 does not apply to nuts required weldability, corrosion resistance and/or withstandin
47、g temperatures above +300 O C (+250 “C for nuts made of free-cutting steel) or below -50 OC. 2 This Annex 3, being shifted the contents to each citing standard, will be expired on 31st December 2000. Normative references The following standards contain provisions which, through reference in this Annex 3, constitute provisions of this Annex 3. The most recent editions of the standards indicated below shall be applied. JIS B O101 JIS B 0205 JIS B 0207 JIS Z 2243 JIS Z 2245