BS A 297-1987 Specification for internal drive offset cruciform recess (Torq-Set(R)) for rotary fastening devices - Metric series《旋转式紧固装置的偏位十字形槽内驱动规范 公制系列》.pdf
《BS A 297-1987 Specification for internal drive offset cruciform recess (Torq-Set(R)) for rotary fastening devices - Metric series《旋转式紧固装置的偏位十字形槽内驱动规范 公制系列》.pdf》由会员分享,可在线阅读,更多相关《BS A 297-1987 Specification for internal drive offset cruciform recess (Torq-Set(R)) for rotary fastening devices - Metric series《旋转式紧固装置的偏位十字形槽内驱动规范 公制系列》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、British Standard A 297 : 1987 IS0 79941985 UDC 621.882.216.5:629.7 0 British Standards Institution. No part of this publication may be photocopied or othetwise reproduced without the prior permission in writing of BSI British Standard Aerospace Series : Specification for Internal drive, offset cruci
2、form recess (Torq-Set) for rotary fastening devices. Metric series IS0 title: Aerospace - Internal drive, offset cruciform recess (Torq-Set 1 for rotary fastening devices - Metric series Srie arospatiale. Empreinte cruciforme dporte dentrainement intrieur (Torq-Set) pour dispositifs de fixation. Sri
3、e mtrique - Spcifications Luft- und Raumfahrt-Reihe. Mechanische Verbindungselemente mit I nnenantrieb und FIgeIkreuzschIitz (Torq-Set). Metrische Reihe Contents National foreword Committees responsible Specification O. Introduction I. Scope 2. Field of application 3. References 4. Definitions 5. Ch
4、aracteristics 6. Designation Tables 1. Recess - General dimensions 0 2. Recess dimensions applicable to 100 o countersunk normal and reduced head Page 1 Back page 4 5 3. Recess dimensions applicable to normal flat top pan head 4. Recess gauge - Dimensions 5. Recess penetration gauge - Dimensions 6.
5、Driver - Dimensions Figures 1. Recess -Configuration 2. Recess in 100 o countersunk head 3. Recess in normal flat top pan head 4. Recess gauge - Configuration 5. Recess penetration gauge - Configuration 6. Driver - Configuration Page 6 8 10 11 4 5 6 7 9 11 National foreword This British Standard, wh
6、ich has been prepared under the direction of the Aerospace Standards Committee, is identical with IS0 7994-1985 Aerospace - Internal drive, offset cruciform recess (Torq-SetQ) for rotary fastening devices - Metric series published by the international Organization for Standardization (ISO. Terminolo
7、gy and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the foliowing. The comma
8、 has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words International Standard appear referring to this standard, they should be read as British Standard. . British Standards Institution BSI Ar297 8
9、7 = 3b24bb O083293 4 1 s f * British Standard A 297 : 1987 Cross-references International standard Corresponding British Standard IS0 128-1982 BS 308 Engineering drawing practice Part 1 : 1984 Recommendations for general principles (Technically equivalent) Part 3 : 1972 Geometrical tolerancing (Tech
10、nically equivalent) IS0 1101-1983 Attention is drawn to the fact that it is claimed that the Internal drive, offset cruciform recess (Torq-Set) for rotary fastening devices is the subject of British patent No. 1 473 969 copies of which can be obtained from the Patent Office, 25 Southampton Buildings
11、, London WC2A IAY. BSI takes no position as to the validity of the patent or whether it is still in force. The patent is irrevocably endorsed licences of right under Section 46 of the Patents Act 1977, which states: (a) any person shall, at any time after the entry is made, be entitled as of right t
12、o a licence under the patent on such terms as may be settled by agreement or, in default of agreement, by the Comptroller on the application of the proprietor of the patent or the person requiring the licence. (3) Where such an entry is made in respect of a patent - Licence details may be obtained f
13、rom the registered proprietor of the patent. Compliance with a British Standard does not of itself confer immunity from legal obligations. O Introduction Users of this International Standard are advised that the in- ternal drive recess specified in this International Standard is the Torq-Set recess
14、and that trademark and proprietary rights applyl). Patent holders have agreed to negotiate licences on terms and conditions defined in statements that are available on request from the IS0 Central Secretariat. 1 Scope This International Standard specifies maximum and minimum dimensional requirements
15、 for an internal drive recess configura- tion for rotary fastening devices, and for the associated drivers and gauges, for metric design. The combinations suggested herein are provided for metric shank diameters. 2 Field of application This configuration is intended primarily for use in aerospace ap
16、- plications and other critical areas where high assembly and removal torque capabilities are required. 3 References IS0 128, Technical drawings - General principles of presenta- tion. IS0 1101, Technical drawings - Geometrical tolerancing - Tolerancing of form, orientation, location and run-out - G
17、eneralities, definitions, symbols, indications on drawings. 4 Definitions 4.1 internal drive recess: A formed indentation in the centre of the head of the fastener, with a main axis extending along the longitudinal centreline of the part, the function of which is to accept a closely fitting driving
18、tool for the trans- mission of rotary movement. 4.2 driver: A co-operating tool for use with a fastener the form of which matches the indentation in the head of the fastener to provide a coupling between a rotary driving force and the head of the fastener. 1) Torq-Set and ACRO are registered tradema
19、rks of the Phillips Screw Company. 4.3 offset cruciform recess: An internal drive recess of an offset cruciform configuration having four equally spaced radial grooves, the sides of which are parallel to each other and parallel to the axis of the fastener. The clockwise (driving) sides are arranged
20、on 90 radial planes 0 and taper from a maximum diameter at the head surface to a minimum diameter below the the head surface. 4.4 anticamout rib (ACRQ) : A projection of a small cross- section of material extending along a removal counter- clockwise) recess wall and generally parallel to the recess
21、axis. This rib is provided to allow preliminary indentation by the driver projections upon the application of a counter-clockwise torque and resist the tendency for the driver to ride up and out (self-eject) of the recess. Drivers are also provided with projections along the removal walls which exte
22、nd 90 to the axis in order to indent properly the recess projections upon application of a counter-clockwise torque. 2 i i.- i British Standard A 297 : 1987 5 Characteristics O 5.1 form as follows : The configuration, dimensions and tolerances shall con- - recess : in accordance with figures 1,2 and
23、 3 and tables 1, 2 and 3; - recess gauge configuration : in accordance with figure 4 and table 4; - assembly of the recess gauge: in accordance with figure 5 and table 5; - driver tip: in accordance with figure 6 and table 6. 5.2 The presentation of the figures conforms with IS0 128 and the symbols
24、for tolerances of form and position are in ac- cordance with IS0 1101. 5.3 check the recess. These gauges are as follows : Figure 4 and table 4 deal with the various gauges used to - Type A GO gauge: used to measure the recess cavity at maximum material condition and to measure gauge pen- etration v
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