1、AECMA PREN3202 89 B LOL2311 0004973 b A. E. C. M. A. STAN DARD NORM E A. E. C. M.A. A.E.C.M.A. NORM prEN 3202 Issue P 1 April 1989 _ _ DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88. boulevard Malesherbes, 75008 PARIS - TL. 45-63-82-85 UDC ; Key words : ENGLISH VERSION Aer
2、ospace series T-head bolt traps Design dimensions Srie arospatiale Vis tte antirotation T Dimensions dinstallation Luft- und Raumfahrt T- Kopfschrau ben Einbaumape This .Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matr
3、iel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved b y the experts of the concerned AECMA Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed
4、 to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft
5、European Standard to CEN (European Committee for Standardization) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 921 O0 BOULOGNE-BILLANCOURT Edition approved for publication Comments should be sent within six months C8 Chairman Mr WILLIAMS after the date o
6、f publication decision A.E.C.M.A. 88, Bd. Malesherbes 25th April 1989 75008 PARIS - FRANCE aecrna 1989 O * O O prEN 3202 Page 3 1 Scope and field of application This standard establishes a recommended practice for calculating the diameters of surfaces that interface with the head of tee head bolts.
7、It prevents the bolt rotating during tightening and incorrect assembly, 2 General design information 2.1 The minimum trap height should be the bolt head height. At places where the bolt head, during assembly, is inaccessible or not visible, the trap should be of such height that ensures head engagem
8、ent before nut can be engaged on threads. Where this cannot be achieved a generous chamfer should be used. This prevents a wrong assembly. See figure 1. Figure 1 - Minimum trap height 2.2 Selection of bolts The hole dimensions for bolts as per EN 2931, EN 2933 and EN 2935 are listed in table 1. The
9、holes for bolts with f7-shank as per EN 3293, EN 3294 and EN 3301 are defined in table 2 and 3. 3 Installation dimensions 3.1 Trap diameter The trap diameter definition is divided into two cases: - trap diameter smaller than pitch circle diameter, see 3.1.1 - trap diameter greater than pitch circle
10、diameter, see 3.1.2. The diameter tolerance for the diameter F is t 0,l mm and the runout tolerance is 0,15 for cases with PD-shank bolts and 0,05 with f7-shank bolts. 7 .- I Previous page j is blank prEN 3202 Page 4 3.1.1 Trap diameter smaller than pitch circle diameter 1) Figure 2 The trap diamete
11、r is determined as follows: Formula 1: F = D - Smax - 0,6 3.1.2 Trap diameter greater than pitch circle diameter 1) 60 Figure 3 The trap diameter is determined as follows: Formula 2: F = J(D + Smax) + Emax2- + 0,6 1) Figure 2 and 3 are only for illustration of formula 1 and 2. 31.2 Bolt hole +Op3 -0
12、,l Thread Figure 4 D min s max 1) AECMA PREN3202 87 IOI23I1 OOOL1776 I m, MJ50,8 MJ6x1,O MJ7x1,O MJ8x1,O M JlOx1,25 prEN 3202 Page 5 098 70 894 098 70 995 0,8 80 10,5 098 90 11,5 0,8 90 13,3 3.2.1 PO-shank bolt Table 1 - Dimensions for PO-shank bolts 1) for recommendation only E max 11,6 12,5 13,9 1
13、4,5 17,O all dimei H (H13) 5,5 +0,18 7,7 +0,22 6,6 +0,22 8,8 +0,22 10, +0,27 ;ions in mm C (HI41 6,4 +0,36 7,9 +0,36 9,O +0,36 10,l +0,43 12,2 +0,43 The positional tolerance for H is 0,25 diameter at maximum material condition. AECMA PKEN3202 49 lIOL231L OOOLI977 3 i prEN 3202 Page 6 Pitch circle di
14、ameter over to O 75 75 250 250 750 7 50 1600 1600 - 3.2.2 f7-shank bolts in rotating parts Positional tolerance at max. material condition 8 044 8 05 8 0,08 OJO 0,12 Table 2 - Hole dimensions all dimensions in mm Thread MJ5098 M J6x1,O MJlx1,O MJ8x1,O M JlOx1,25 +0,028 5,0 +0,01 +0,028 +0,01 +0,035
15、7,0 +0,013 +0,035 890 +0,013 +0,035 +0,013 The above-mentioned hole dimensions ensure that the bolts are more accurately located during engine build and re-build, so lessening out of balance possibilities. Table 3 - Positional tolerances all dimensions in mm AECMA PREN3202 89 W LOL23Ll 0004978 5 W p
16、rEN 3202 Page 7 . 3.2.3 f7-shank bolts as positioning bolts Table 4 - Hole dimensions all dimensions in mm 1 Thread MJ5x0,8 MJ6x1,O MJ8x1,O MJ10x1,25 MJ7xljO H (H7) 5,O +0,012 6,O +0,012 7,O +0,015 8,O +0,015 10,O +0,015 I Dimensions R, D, S, E, C see table 1. I The positional tolerance for #I H is
17、0,Ol diameter at max,num materiai condition. 3.3 Trap height 3.3.1 The preferred height at visible places A2 min is equal to the bolt head height. Table 5 - Trap height all dimensions in mm I Thread I A2 min I MJ5x0,8 M J6x1,O MJ7x1,O MJ8x1,O M JlOx1,25 Figure 5 - Height A2 min AECMA PREN3202 89 IB 1012311 0004379 7 prEN 3202 Page 8 3.3.2 Height at not visible or inaccessible places A1 min = N - (6 + C) Figure 6 - Height A1 min 4 Drawing callout Figure 7 shows a typical drawing callout for a hole for PD-shank bolts as per paragraph 3.2.1. Figure 7 -hl - Drawing callout a
