1、STD-AECMA PREN 4447-ENGL 2000 I LflL23LL 0038734 T72 Edition approved for publication 2000-1 0-31 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 6-1200 BRUXELLES prEN 4447 Edition P I October 2000 PUBLISHED BY THE
2、EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelie 94 - 8-1200 BRUXELLES - Tel. (t32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.30 Descriptors: ENGLISH VERSION Aerospace series Nuts, elliptical clinch, self-locking, UNJ threads, in heat resisting steel FE-PA2601 (A286), Mo 25 mm
3、 Aerospace series 3) EN 2424 Aerospace series - Marking of aerospace products EN 2491 Aerospace series - Molybdenum disul phide dry lubricants - Coating methods EN 3639 Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked -Wire for forged fasteners - D c; 15 mm - 900 MPa I I
4、 1 100 MPa 4) EN 4444 Aerospace series - Nuts, elliptical clinch, self-locking, in heat resisting steel FE-PA2601 (A286), Mo& coated - Classification : 900 MPa (at ambient temperature) I425 OC - Technical specification 4) 3 Required characteristics 3.1 See figure 1 and tables 1 and 2. Dimensions and
5、 tolerances are in millimetres. They apply before Mos2 coating. Configuration - Dimensions - Tolerances - Masses 3.2 Materials EN 2399 or EN 3639 3.3 Surface treatment EN 2491 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or c
6、racking when tested with a bolt of a higher strength class. 2) Maximum test temperature of the parts 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 4447: 2000 Thread Values apply bef
7、ore Mos2 coating. Thread surface will be as achieved by normal methods of manufacture. Remove sharp edges O, 1 to 0,4. B C D I Ei I H J Code I Designation + 0,15 t 0,15 - 0,02 O O min. O min. -0,07 - 0,l Ref. Ref. 048 063 079 095 0.190-32UNJF-3B 9,25 8,951 7,80 735 6,40 505 I ,50 0,75 0,250-28UNJF-3
8、B 11,80 11.50 10,OO 9,75 8,30 6,58 1 0.90 0,312 524UNJF-3B 14,25 13,95 12,lO 11,85 10,OO 8.20 2,20 1,lO 0,375-24UNJF-36 16,85 16,55 14,30 14,05 11,96 9,80 230 I ,25 STD-AECMA PREN LiVW-ENGL 2000 LOL2311 Oll38937 783 Page 5 prEN 4447: 2000 - O ln t =l (4 N Q? O +I (12 In +I kg N N rq I- N Q (r -. (3 eo x O 02 +I STDmAECMA PREN 11447-ENGL 2000 3032333 0038738 b38 W Description block Page 6 prEN 4447: 2000 Identity block 4 Designation EXAMPLE: Number of this standard Thread code (see table 1) 5 Marking EN 2424, style A, as indicated on figure I 6 Technical specification EN 4444
