1、AECMA PREN2934 Ab W LO1979:Aerospace construction,rolled screw threads: runout and lead requirements. ISO585/1;1981:Aerospace construction - MJ threads - Part 1: Basic profile. ISOS855/2;1981:Aeraspare construction - MJ threads - Part 2: Dimensians for bolts and nuts. EN2348 :Heat resisting steel FE
2、PA9Z-HT, RM =SOMPa, bars for machined bolts: Aerospace series. EN2399 :Heat resisting steel FE-PA92-HT, RM =90MPa, bare for forged bolts: Aerospace series. EN2424 :Aerospace series;fateners:identification marking of. EN2786 :Aerospace series;metallic siver coating: technical specification. EN3043 :
3、Aeraspace series;fasteners,ticrews and studs makeri al FE-BA9Z-HT,class 900MP1/650C. : technical specification. 3. Required chsracteri sti ts. S. 1 Coniguration-drnensions-tolerances. The configuration shall correspond with figurei, dimensians and tolerances shall correspond to figurei and tables1 %
4、 2. 3.2 Material. Heat resisting steel FE-PA9Z-HT to ENZ398 or EN2399. 3.3 Surface treatment. SLlver coat all oset- to ENZSt,coating thickness 3 to UKI on the thread flanks, meaeiured at the pitch diameter. I : Previous page is blank prENZ938 page4 Issue P1 c - Roiled Break sharp edges 0,l to 0,4 E
5、/ H- W-.I- - St-hpe in this area at manufacturers option 6 plam Dia code 030 040 . . Flat to concave I +ZEn *,O8 A not convex -Iso 3353 - I Thread pitch diameter Figure.1. Table 1 Thread OD IE IS0 5855 I Max I Min I Min /Al -. O,OOW I M OA Q3F Min Dimensions in mm R S W 030 0,4 0,2 6,O 5,88 040 0,4
6、0,2 7,O 6,85 AECMA PREN2938 Bb m LOL23LL 00045272 mii 004 4 006 6 008 8 010 10 012 12 014 14 016 16 018 1s 020 20 - I Table 2 0,?4 1,02 Mass quot 1 Length f N 1,62 1,77 I =Ode I I 032 I 32 Di ameter codes Mass Mass 1120 I 2,09 1 1,38 I 2,40 I 1,65 2,87 1,73 2,oo I 3,49 1 prEN2738 page5 Issue PI prEN
7、Z938 page6 Issue P1 4. Designation Each screw shall only be designated a5 follows: Decr i pt i on bl oc k Identi f i cati on block Screw EN38-030 1 i diameter code(5ee table11 number of EN standard length code(see table2) Nota:If required the design code S900LI may be introduced between the description block and the identity block. 5.Marking. Each screw shall be marked on the tap surface of the head in accardance with EN2424,style il. .Technica1 specif icatian. Screws to this standard shall ssmform to the requirements of EN3043.
