1、BRITISH STANDARD AEROSPACE SERIES BS EN 3202:1995 Holes and traps for T-head bolts Design standard The European Standard EN3202:1995has the status of a British StandardBSEN3202:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe
2、authority of the Standards Board and comesintoeffect on 15September1995 BSI10-1999 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment88/71157DC ISBN 0 580 24096 7 Committees responsible for this British Standard The preparation of this Brit
3、ish Standard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society
4、of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSEN3202:1995 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope 3 2 Required characteristics 3 3 Designation 7 4 Indication on dr
5、awings 8 Figure 1 3 Figure 2 4 Figure 3 4 Figure 4 5 Figure 5 5 Figure 6 6 Figure 7 8 Table 1 4 Table 2 6 Table 3 6 Table 4 7 Table 5 7 Table 6 7 List of references Inside back coverBSEN3202:1995 ii BSI 10-1999 National foreword This British Standard has been prepared by Technical Committee ACE/12an
6、d is the English language version of EN3202:1995, Aerospace series Holes and traps for T-head bolts Design standard, published by the European Committee for Standardization (CEN). EN3202:1995was produced as a result of international discussions in which the United Kingdom took an active part. A Brit
7、ish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fron
8、t cover, an inside front cover, pages i and ii, theEN title page, pages2to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD
9、NORME EUROPENNE EUROPISCHE NORM EN 3202 July 1995 ICS 49.040.20 Descriptors: Aircraft industry, screw, hole, characteristic, dimension, dimensional tolerance, designation English version Aerospace series Holes and traps for T-head bolts Design standard Sries arospatiale Trous et dgagements pour vis
10、tte en T Norme de conception Luft- und Raumfahrt Lcher und Anlageflchen fr T-Kopfschrauben Konstruktionsnorm This European Standard was approved by CEN on1995-03-18. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stan
11、dard 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 Secretariat or to any CEN member. The European Standards exist in three official versions (English, French,
12、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 versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, Franc
13、e, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995
14、Copyright reserved to CEN members Ref. No. EN 3202:1995EEN3202:1995 BSI 10-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this standard ha
15、s 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 the status of a National Standard, either by publication of an identical text or by endorsement, at th
16、e latest by January1996, and conflicting national standards shall be withdrawn at the latest by January1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland,
17、 Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom.EN3202:1995 BSI 10-1999 3 0 Introduction This standard specifies a procedure for calculating traps for T-head bolts. This provides standard traps which prevent the bolts from rotating during
18、tightening and prevent incorrect mating. The application of T-head bolts may cause flange deformations (notches). Where only small notches are acceptable due to high notch sensitivity of the trap surface, close tolerance bolts and their associated holes for rotating parts shall be used in static par
19、ts. 1 Scope This standard specifies the holes and traps for T-head bolts with head configuration to EN standards for aerospace applications. 2 Required characteristics See Figure 1 to Figure 5 for traps, Figure 6 for holes and Table 1 to Table 6. Dimensions and tolerances are in millimetres. The tra
20、p 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: Table 4; Close tolerance bolts used as positioning elements: Table 6. 2.1 Traps See Figure 1 and Table 1. 1) 0,15 for relieved shank
21、bolts 0,05for close tolerance bolts 2) Height in places where the bolt head is not visible during assembly. 3) Height in visible places Figure 1 EN3202:1995 4 BSI 10-1999 Table 1 2.1.1 T-head bolts installed on a straight line See Figure 2 and Table 1. 2.1.2 Trap diameter F smaller than pitch circle
22、 diameter D See Figure 3 and Table 1. Diameter code Nominal bolt thread diameter A 1min. ab A 2min. b D bc F b K R Bolt dimensions b E dmax. S dmax. 050 5 See 2.1.4. 3,4 70 See 2.1.2 and 2.1.3 4,45 0,8 11,6 8,4 060 6 3,9 5 12,5 9,5 070 7 4,5 80 5,5 13,9 10,5 080 8 5 90 6 14,5 11,5 100 10 5,8 6,9 17
23、13,3 a Where this dimension cannot be achieved, a generous chamfer shall be used to prevent incorrect assembly. b Dimensions do not form a part of designation. c Recommendation only. The minimum pitch circle diameter necessary for correct mating of the T-head bolts. d See the relevant product standa
24、rd. Figure 2 Figure 3 +0,1 0 + 0,30,1 EN3202:1995 BSI 10-1999 5 2.1.3 Trap diameter F greater than pitch circle diameter D See Figure 4 and Table 1. 2.1.4 Trap height A 1min. See Figure 5. Figure 4 Figure 5 EN3202:1995 6 BSI 10-1999 2.2 Holes See Figure 6. 2.2.1 Holes for relieved shank bolts See Ta
25、ble 2 and Table 3. Table 2 Table 3 1) See 2.2.1, 2.2.2 or 2.2.3. Figure 6 Hole type code Diameter code Nominal bolt thread diameter C H max. min. nom. Tol. aH12 A 050 5 6,76 6,4 5,15 060 6 8,26 7,9 6,15 070 7 9,36 9 7,15 080 8 10,53 10,1 8,15 100 10 12,63 12,2 10,15 a The expression of the tolerance
26、 (symbol or value) is left to the designers discretion. Pitch circle diameter D Positional tolerance for H at maximum material condition 0 D k 250 ? 0,08 250 D k 600 ? 0,1 600 D k 1600 ? 0,15 + 0,12 0 + 0,15 0EN3202:1995 BSI 10-1999 7 2.2.2 Holes for close tolerance bolts See Table 4 and Table 5. Ta
27、ble 4 Table 5 2.2.3 Holes for close tolerance bolts used as positioning elements See Table 6. The positional tolerance for H is ? 0,01at maximum material condition. Table 6 3 Designation EXAMPLE: Hole type code Diameter code Nominal bolt thread diameter C H max. min. nom. Tol. aF8 B 050 5 6,76 6,4 5
28、 + 0,028 + 0,01 060 6 8,26 7,9 6 070 7 9,36 9 7 + 0,035 + 0,013 080 8 10,53 10,1 8 100 10 12,63 12,2 10 a The expression of the tolerance (symbol or value) is left to the designers discretion. Pitchcirclediameter D Positional tolerance for H at maximummaterialcondition 0 D k 75 ? 0,04 75 D k 250 ? 0
29、.05 250 D k 750 ? 0,08 750 D k 1600 ? 0,1 1600 D k ? 0,12 Hole type code Diameter code Nominal bolt thread diameter C H max. min. nom. Tol. aH7 C 050 5 6,76 6,4 5 + 0,012 0 060 6 8,26 7,9 6 070 7 9,36 9 7 + 0,015 0 080 8 10,53 10,1 8 100 10 12,63 12,2 10 a The expression of the tolerance (symbol or
30、value) is left to the designers discretion.EN3202:1995 8 BSI 10-1999 4 Indication on drawings EXAMPLE: Figure 7 shows a drawing callout for a hole for relieved shank bolts. Alternatively, the hole may be fully dimensioned on the drawing. Figure 7 BSEN3202:1995 BSI 10-1999 List of references See nati
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