1、Edition approved for publication 16 February 1987 Comments should be sent within six months after the date of publication decision A.E.C. M .A. 88, Bd. Malesherbes 75008 PARIS - FRANCE C3 Chairman Mr ARENA AECMA PREN2884 87 W 10L231L 0004301 L W - Previous page is blank Issue P 1 prEN2884 Page 3 1 S
2、cope and field of application O This standard specifies the characteristics for bolts with pan recess, coarse tolerance shank and short thread, in anodized tensile strength classification 1100 MPa, . for general purpose vehicle assemblies, where temperatures do not exceed 315 OC. 2 References IS0 33
3、53, Aerospace construction - Rolled threads threads IS0 585511, Aerospace construction - MJ threads - Par IS0 585512, IS0 7913, IS0 7994, e EN2424, EN2491, EN2808, EN3051, EN3067, head, Torq-Set itanium alloy of use in airbone - Runout and lead 1 : Basic profile Aerospace construction - MJ threads -
4、 Part 2 : Dimensions for bolts and nuts Aerospace - Fasteners - Tolerances of form and position for bolts and screws Aerospace - Internal drive, Torq-Set offset cruciform recess for rotary fastening devices - Metric series Identification marking of standard fasteners - Aerospace series Aerospace ser
5、ies - Molybdenum disulfide solid film lubricants for application to removable fasteners in titanium, titanium alloy, corrosion resisting steel and cadmium plating steel 1) Aerospace series - Anodizing of titanium and titanium alloy 1) Aerospace series - Substitute materials for bolts Bolts and screw
6、s, protruding and flush head, either with h12 tolerance shank or fully threaded, in titanium alloy of tensile strength - Classifications 900 and 1100 MPa - MJ threads - Technical specification 1) 3 Required cha racteri s t icc 3.1 Configuration - Dimensions - Tolerances The configuration shall be in
7、 accordance with the figure ; the dimensions and tolerances 2) shall conform with the values shown in the figure and in tables 1 and 2, after anodizing but before lubrication. 3.2 Surface roughness See figure. The values apply before anodizing and lubrication. 3.3 Materials Titanium alloy EN3051 3.4
8、 Surface treatments Anodizing EN2808 Lubrication EN2491, 5 to 10 pn, 1) In preparation 2) In conformity with IS0 7913 for tolerances of form and position, except those marked *, see table 1. Issue P 1 prEN2884 Page 4 3j?/l#y O- Rolled Break sharp edges 0,l to 0,4 mm A (L 1D) B (L 1D) o ,081-1 I 1) R
9、unout shall be measured at 1D. If (L-R) D measure at 0,5 (L-R). 2) N = L nom. + M - Figure - Configuration 7994 - IA N H- l-4 O U p4- ?I O u a- $ + &O cl II 8 c l-4 O u 5:- m wrl m Y plop -.) O0 10 P I I I I I I I i i 1 o g/ w o o, h N O 2 O +I N P 5 Ii v) u &I (d a rn ln W rn v: H * 3 h u e O rw u
10、C H d 8 r Issue P 1 prEN2884 Page 6 Table 2 - Dimensiona codes, lengths and masses Dimensions in millimetres Issue P 1 prEN2884 Page 7 Table 2 - Dimensional codes, lengths and masses (continued) Dimensions in mi I I me tres i) Values apply to bolts without hole. 2) The preferred length ranqe lies wi
11、thin the bold lines, If greater lengths-are necessary they shall be chosen in steps of 2 mm for lengths L less than 100 mm and in multiples of 4 above 100 mm. The length code corresponds to the length L in millimeres completed by a zero to the left, where necessary, to obtain a 3 digit code. _ -_ _
12、_ I AECMA PREN2884 87 m L0123LL 0004306 O Issue P 1 prEN2884 Page 8 Description block 4 Designation Each bolt shall only be designated as in the following example : I dent it y block Number of EN Standard 030 : Diameter code (see table 1) D : Locking code (see table 3) I table II Diameter code 030 a
13、nd 040 Table 3 - Locking code Marking style D Split pin hole O - Note : If necessary the originator code S9005 may be introduced between the description block and the identity block. 5 Marking Each bolt shall be marked in the position shown in the figure in accordance with the styles shown in table 4 as defined by EN2424. Table 4 - Marking styles 050 to 120 B I 6 Technical specification EN3067.
