1、Document 89 / 7837 3 I DRAFT FOR PUBLIC COMMENT Latest date for receipt of comments British Standards Institution Technical Committee ACE/12 Aerospace fasteners and fastening systems DRAFT STANDARD AEROSPACE SERIES NUTS, SELF-LOCKING, HEXAGONAL WITH CAPTIVE WASHER, IN HEAT RESISTING STEEL FEFPA92HT
2、(A286), SILVER COATED CLASSIFICATION: 1100 MPA/425C (prEN 3034) This draft is now available for public comment and your views and technical comments on it would be appreciated. If you have no specific comments to make but find it generally acceptable it would be helpful if you would notify us accord
3、ingly. Suggestions entailing revision of the text should indicate the preferred wording. Please quote the relevant clause number against any comment. The Co-ordination of the requirements of this draft with those of any related standards is of particular importance and you are invited to point out a
4、ny areas where this may be necessary. All comments should be sent to the Committee Secretary M J B ttki at the London/- address below. The comments received will be passed to the committee concerned for their consideration; no acknowledgement will normally be sent. Requests for further copies of thi
5、s draft should be sent to: Sales Administration (Drafts), BSI, Linford Wood, Milton Keynes MK14 6LE. 5. Non-mem6ers should send a remittance of x.Qo together with an addressed label. Orders not accompanied by a remittance will be subject to a delay. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED A
6、S A BRITISH STANDARD Head Office Manchester Office 2 Park Street London WL4 2BS Telephone 01-629 9000 Telex 266933 BSILON G Head Office 3 York Street Manchester h42 2AT Telephone 061-832 3731 Telex 665969 BSIMAN G 825777 BSIMK G Sales dimensions, tolerances and masses shall conform with the figure a
7、nd the table. Details of form, not stated are at the manufacturers option. Dimensions apply after coating. 3.2 Material Nut: Washer: Heat resisting steel FE-PA92 HT according to EN3638 or steel FE-PA15. Heat resisting steel FE-PA92 HT according to EN2399, EN3638 or EN3639. 3.3 Surface treatment Nut:
8、 Silver coat to EN2786, coating thickness 5 to 15 /um. On nuts MJ6 and larger, the coating thickness shall not be less than 5 /um, measured at the pitch diameter. Nuts MJ5 and smaller shall show complete coating coverage on the threads. Washer: Passivated to EN2516 i) Published as AECMA standard. 2)
9、 In preparation. 3) Published as AECMA pre-standard. prEN 3034 Page 4 max. 8earlng rurfoce my be flot to concave. but shall not be convex rher sholl be free rotote on the nut Form out of round in thls are0 to achleve the self-locklng torque requlrements tool mrkr acceptable Rwve sharp edges 0.1 to 0
10、,4 m hamfer. rodlur or HKL min. man There values are to be opplled before sllver coatin . Thrcods surface wii? be ochleved by normal methods of manufacture y Figure - Configuration 24) mass kgIl000 part approx. Table 1 - Dimensions and masses 2) Toi I I- , h12 hl3 Dimensions in millimetres G max 792
11、 8.6 10,9 12.4 13,9 15,4 18,6 21,7 Thread 1) Designation =Ode I MJ5x0,8-4H6H M J6x1,04H5H 070 I MJ7x1,0-4H5H 080 I MJ8x1,0-4H5H T min. - M min. - N 3) min. 0,l 0,4 0,91 0,l ,0,4 1,18 0,l 0,4 1,77 !w 0.15 0,4 10,7 1) Thread in conformity with IC05855 part 1 and part 2. In the self-locking zone, the t
12、olerances apply before forming out-of-round. 2) Acroas flats dimensiona apply before forming out-of-round, but finished nuts hall fit a standard socket wrench. 3) Wrench pad engagement. 4) These values apply before forming out-of-round. 4 prEN 3034 Page 5 4 Designation Each hexagonal nut shall only
13、be designated as in the following example: Description block Identity block EN3034-050 Number of EN Standard Thread code (see table 1) Note - If necessary, the design code I9005 may be introduced between the description block and the identity block. 5 Marking Each hexagonal nut shall be marked in accordance to EN2424, class F. 6 Technical specification The hexagonal nuts shall conform to the requirements of EN3152.
