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1、A Reference number ISO 3168:1998(E) INTERNATIONAL STANDARD ISO 3168 Second edition 1998-12-01 Aerospace Nuts, anchor, self-locking, fixed, single lug, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 C, 1 100 MPa (at ambient temperature)/315 C and 1 100 MPa
2、(at ambient temperature)/425 C Dimensions Aronautique et espace crous river, freinage interne, fixes, simple patte, avec chambrage, filetage MJ, classifications: 1 100 MPa ( temprature ambiante)/235 C, 1 100 MPa ( temprature ambiante)/315 C et 1 100 MPa ( temprature ambiante)/425 C Dimensions Copyri
3、ght International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3168:1998(E) ISO 1998 All rights reserved. Unless
4、 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. International Organization for Standardization Case postale 56 CH-1211 Genve
5、20 Switzerland Internetisoiso.ch Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committ
6、ees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the In
7、ternational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 membe
8、r bodies casting a vote. International Standard ISO 3168 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This second edition cancels and replaces the first edition (ISO 3168:1986), which has been technically revised. Copyrigh
9、t International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 3168:1998(E) iii Introduction The dimensions spe
10、cified in this International Standard have been determined to satisfy the requirements of the procurement specification of ISO 5858. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/20
11、07 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking pe
12、rmitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 3168:1998(E) 1 Aerospace Nuts, anchor, self-locking, fixed, single lug, with counterbore, with MJ threads, classifications: 1 100 MPa (at ambient temperature)/235 C and 1 100 MPa (at ambient temperature)/315 C and 1 100 MPa (at amb
13、ient temperature)/425 C Dimensions 1 Scope This International Standard specifies the dimensions of self-locking, fixed, single lug anchor nuts, with counterbore, with MJ threads, for classifications 1 100 MPa1)/235 C2), 1 100 MPa1)/315 C2) and 1 100 MPa1)/425 C2). This International Standard is only
14、 applicable for the compilation of aerospace product standards. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards
15、are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5855-
16、2:1988, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 5858:1991, Aerospace Self-locking nuts with maximum operating temperature less than or equal to 425 C Procurement specification ISO 8788:1987, Aerospace Fasteners Tolerances of form and position for nuts. 3 Configuration a
17、nd dimensions See figure 1 and table 1. Dimensions and tolerances are expressed in millimetres. They apply after any surface coating(s) but before the application of any lubricant. The metallic cap (optional) shall remain joined (type of attachment at the users discretion) to the nut at the maximum
18、operating temperature. See test conditions specified in ISO 5858. _ 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum temperature that the nut is able with
19、stand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical S
20、tandards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3168:1998(E) ISO 2 NOTE Tolerances of form and position shall conform to those specified in ISO 8788. Details of form not stated are at the manufacturers option. 1)
21、 These values, in micrometres, apply before any surface coating(s) is (are) applied. The values do not apply to threads, punched holes or shear edges, the surface texture of which will be as achieved by the usual manufacturing methods. 2) Tooling marks permissible in this area. Figure 1 Table 1 Diam
22、eter code Thread 1) C max. D max. EFG min. H min. J2) max. K max. L max. M max. N max. P3) max. Q max. R ST max. V 0,25 030MJ3 0,5 4H6H664,6617,7 3,22,51,6 040MJ4 0,7 4H6H6,68,54,42,26,2823,7 5,81,111132,9 050MJ5 0,8 4H6H0,48,19,585,52,47,3925,2 6,911,4 13,43,5 060MJ6 1 4H5H9,26,58,71027,7 8,11,312,
23、7 14,74 080MJ8 1 4H5H12,88,510,91329,7 9,91,71518355,7 100MJ10 1,25 4H5H151310,5312,9 16,2 34,3121,920,2224,53,566,6 1) In accordance with ISO 5855-2. In self-locking zone, the tolerances apply before forming out-of-round. 2) Measured at sharp corners (chamfered) or points of tangency (radiused). 3)
24、 Maximum protrusion of the bolt. 4,8 8,5 3,5 0,5 11 3 2,7 2,5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license
25、from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3168:1998 (E) ISO ICS 49.030
26、.30 Descriptors: aircraft industry, fasteners, MJ threads, nuts (fasteners), anchor nuts, self-locking nuts, single-lug nuts, counterbore nuts, classification, form specifications, dimensions. Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:15:55 MDTNo reproduction or networking permitted without license from IHS -,-,-