1、 * CEN EN*3202 95 340458q 0305368 120 m BRITISH STANDARD AEROSPACE SERIES Holes and traps for T-head bolts Design standard The European Standard EN 3202 : 1995 has the status of a British Standard BS EN 3202 : 1995 This British Standard, having been prepared under the direction of the Engineering Se
2、ctor Board, was published under the authority of the Standards Board and comes into effect on 15 September 1995 0 BI 1995 The following BI references relate to the work on this standard: Committee reference ACE/lZ Draft for comment 8871157 DC ISBN O 580 24096 7 Committees responsible for this Britis
3、h Standard The preparation of this British Standard was entrusted to %chnical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronics, %lecommunications and Business British Industrial Fasteners Federation Ministry of
4、Defence Society of British Aerospace Companies Ltd. Equipment Industries Amendments issued since publication Amd. No. Date Text affected . CEN EN*3202 95 3404589 0105170 889 BS EN 3202 : 1996 Contents page Committees responsible Inside front cover National foreword ii Foreword 2 Specification O Intr
5、oduction 2 Required characteristics 3 Designation 4 Indication on drawings 1 scope i CEN EN*3202 95 3404589 0105171 715 = BS EN 3202 : 1995 National foreword This British Standard has been prepared by Technical Committee ACE/12 and is the English language version of EN 3202 : 1995, Aerospace series
6、- Holes and traps for T-head bolts - Design standard, published by the European Committee for Standardization (CEN). EN 3202 : 1995 was produced as a result of international discussions in which the United Kingdom took an active part. Compliance with a British Standard does not of itself confer immu
7、nity from legal obligations. ii CEN EN*3202 95 3Y04589 0305372 b53 - EUROPEAN STANDARD EN 3202 NORME EUROPENNE EUROPISCHE NORM July 1995 ICs 49.040.20 Descriptois: Aircraft industry, screw, hole, characteristic, dimension, dimensional tolerance, designation English version Aerospace series - Holes a
8、nd traps for T-head bolts - Design standard Sries arospatiale - Luft- und Raumfahrt - Trous et dgagements pour vis tte en T - Lcher und Anlageflchen fr Norme de conception T-Kopfschrauben - Konstruktionsnorm This European Standard was approved by CEN on 1995-03-18. CEN members are bound to comply wi
9、th the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretari
10、at or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official v
11、ersions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normal
12、isation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-lO5 Brussels O 1995 Copyright reserved to CEN members Ref. No. EN 3202 : 1995 E Page 2 EN 3202 : 1995 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). Af
13、ter inquiries and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given
14、the status of a National Standard, either by publication of an identical text or by endorsement, at the latest by January 1996, and conflicting national standards shall be withdrawn at the latest by January 1996. According to the CEN/ CENELEC Internal Regulations, the following countries are bound t
15、o implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. CEN EN*3202 95 m 3404587 0105174 424 Page 3 EN 3202: 1995 O Introduction This standa
16、rd specifies a procedure for calculating traps for T-head bolts. This provides standard traps which prevent the bolts from rotating during tightening and prevent incorrect mating. The application of T-head bolts may cause flange deformations (notches). Where only small notches are acceptable due to
17、high notch sensitivity of the trap surface, close tolerance bolts and their associated holes for rotating parts shall be used in static parts. 1 Scope This standard specifies the holes and traps for T-head bolts with head configuration to EN standards for aerospace applications. 2 Required character
18、istics See figures 1 to 5 for traps, figure 6 for holes and tables 1 to 6. Dimensions and tolerances are in millimetres. The trap dimensions are listed in table 1. The hole dimensions are listed as follows : - Relieved shank bolts in static parts : table 2 ; - Close tolerance bolts in rotating parts
19、 : table 4 ; - Close tolerance bolts used as positioning elements : table 6. CEN EN*3202 95 3404589 0105175 360 Page 4 EN 3202 : 1995 2.1 Traps See figure 1 and table 1. 0 Ff0,l t c 1 ) 0,15 for relieved shank bolts 0,05 for close tolerance bolts 21 Height in places where the bolt head is not visibl
20、e during assembly. 3) Height in visible places Figure 1 Table 1 ) Dimensions do not form a part of designation. commendation only. The minimum pitch circle diameter necessary for correct mating Of the T-head CEN EN*3202 95 3404589 OL0517b 2T7 Page 5 EN 3202 : 1995 2.1.1 T-head bolts installed on a s
21、traight line See figure 2 and table 1 S max. K min. = - + 0,25 2 Figure 2 2.1.2 Trap diameter F sdler than pitch circle dismeter D See figure 3 and table 1. fmax. = D - S max. - 0,5 F min. = F max. - 0,2 Figure 3 2.1.3 Trap diameter F greater than pitch circle diameter D See figure 4 and table 1. Fm
22、in. = (+Smax)*+imax2 +0,5 F max. = Fmin. + 0,2 Figure 4 CEN EN+3202 95 3404589 0105177 133 W Page 6 EN 3202 : 1995 2.1.4 Trap height A, niin. See figure 5. A, min. = N- (V + W) N max. bolt length V + W min. clamped length Figure 5 2.2 Hdes See figure 6. 90 f 50 1) See 2.2.1, 2.2.2 or 2.2.3. Figure 6
23、 Page 7 EN 3202 : 1995 Pitch circle diameter O O Ds 250 250 c DS 600 2.2.1 See tables 2 and 3. Holes for relieved thank bolts Positional tolerance for H at material condition 0 0,08 0 0,l Table 2 Hole type code Hole type Diameter Nominl C H diameter max. I min. nom. code code bolt thread Diameter No
24、minal C H 1“:s“ code bolt thread diameter max. min. nom. I 060 6 8,26 7,9 6,15 , 070 7 936 9 7.15 + 0,15 080 8 10,53 10,l 8,15 O A 050 I 5 6.76 6.4 5 ,+ 0,028 060 6 8,26 7.9 6 + 0,Ol + 0,035 + 0,013 B 070 7 9,36 9 080 8 10.53 10,l 1 O0 10 12.63 12.2 10 1 1 I 100 I 10 I 12,63 I 12,2 I 10,15 I I Posit
25、ional tolerance for H at material condition Pitch circle diameter D c 4 1) The expression of the tolerance (symbol or value) is left to the designers discretion. 750 Ds 1 600 1600 DS - Table 3 0 0.1 0 0,12 1 600 DST6 1 0 0,15 1 2.2.2 Hdes for close tolerance bdts See tables 4 and 5. Tble 4 I i) The
26、expression of the tolerance (svmbol or valuel is left to the I designers discretion. Table 5 I ODS 75 I 0 0.04 I i 75 Ds 250 I 0 0.05 I I 250 DS 750 I 0 0.08 I Page 8 EN 3202 : 1996 Hde type code 2.2.3 Hdes for close tdemnce bdts used 8s positioning elements Diameter Nomhd C H diameter max. I min. n
27、am. code bolt thread See table 6. The positional tolerance for H is 0 0,Ol at maximum material condition. 050 5 6,76 6.4 5 + 0,012 060 6 a,26 7.9 6 O + 0,015 C 070 7 9,36 9 080 a 10,53 10,l 80 1 O0 10 12,63 122 10 t Table 6 I 11 The expression of the tolerance (symbol or value) is left to the I desi
28、gners discretion. 3 Designation EXAMPLE : Identity block . CEN ENx3202 95 3404589 OL05LBO 728 Page 9 EN 3202 : 1995 4 Indication on drawings EXAMPLE : Figure 7 shows a drawing callout for a hole for relieved shank bolts. 0 491 i 0,l t-I 2 10,151 A I 8 1 r O Lz +I o HOLE EN3202A050 i- I Figure 7 Alte
29、rnatively, the hole may be fully dimensioned on the drawing. CEN EN*3202 95 3404589 OLO5LBL 664 = BS EN 3202 : 1995 List of references See national foreword. CEN EN+3202 75 3404589 0105182 5T = BS EN 3202 : 1995 BSI 389 Chiswick High Road London W4 4AL 9509-5-0.5k-FP BSI - British Standards Institut
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