1、3-29- os- 1. SCOPE MIL-F-8490A (ASG) MILITARY SPECIFI-dTION FASTENER, CASE, FOR EyUIRIENT RACK SYSTBI IN AIRCRAFT This specification has been approved by the Department of the Air Force and by the Xavy C*:zoau o: Aeronautics. 1.1 This specification covers the detail requirements for one tyix of fast
2、ener used on cases for the equipment-rack system in aircraft. 2. APPLICABLE DOCUMENTS 2.1 The following publications, o; the issue in effe:t on date of invitation for bids, form a part of this specification to the extent specified herein: SPECIFICATIONS Fecieral W-A-318 4J-P-hlb PPP-8-56 PPP-EL5 cl5
3、 PPP-B-591 PPP-B-601 PPP-A421 PPP-B-636 PPP-B-676 PPP-T-O Aluminum Alloy 52s; Plate ard Sheet Plating, Cadr.ium (Electrodepxited) Ekxes, Folding, Paperboard Boxes, Wo P.ipmbr, ;) _I I a Test hletlwis P!ilitary 1 MILSTO-105 KIL-STD-129 Samlin- Proceaures ailrocilring acsivity or as directed by the co
4、ntractins officer.) 2.2 Oti;er nub1ications.- Tire follcnin; docui?rnt forrs a ?art uf t:ils sxcification. Cnlxs o:.cnrise indicated, tlie issne in effect on date of invitation for bids shall a?pl; Hational Bureau of Standards Handbook H2d - Screw T:;rcad Stanuardc for Federal Services (A .,lc;tion
5、. - for copies s!iOula be adrexed to t:e Saperintendent of Docur.rnts, Go-fermnt in:inu Office, Washinson 25, D. C.) - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-F-8Ll90A 53 m 7799706 O098929 5 m I _L I .n ! A- l “ A - . - . . -. . Provide
6、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-8470A 53 7777706 0078730 L - 3.3.2 repuxiients Of this screvdriver slot shall be parallel to the lon- axis of the nut-strip uhen in the locked position. The stud sidi be nositively iinlocked at 90 of rot
7、ation in the counter clockwiss direction and screwdriver slot sLA-be perpendicular to the long axis of the nut-strip. A positive lock and unlock shall be present in the fastener assembly when the stud ir not inserted in the nut-strip. Fastener asserlb1 .- Desi A positive stop shall be provided to pr
8、event the stud from being of ful.lock and full- unlock. 3.3.6 3.4 Screw threads.- Screw threads shall be in accordance with Handbook H2a and figures 1 and 2. cation Q,-PKClass B, Type II, black. Wime aluminum or aluuinumalloy parts are used they shall lm covered with an anodic film in accordance wit
9、h S.xcFfication KIL-A-6% except wlim othexnise tipecfied. Finish.- Parts of steel shall be cadmium plated in accordance with Specifi- 3.5 Interchangeability.- All parts having the same nanufacturers part, nwber shall be directly and cor.iplstely interchangeable *with each other with respect to insta
10、llation and perforunce. hood siid remain vithin the Outline dinsnSiOM Of the fastenet useaibly 8houn On figura 2. conom to he diripruiom on ri- :. With tho fartoner in tho locipd position, the acretutriver slot rtiai be in line *fitit tim long air of ttw nut-rtiip. 3.6 3.7 Pasteimr stud head.- With
11、the fastoner stud unlocked, ths top surface of the Screwdrivrr riot.- The sc.*wriver riot in the fostmu rtud hoad alinil Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-F-8Ll70A 53 7779706 0078731 3 m I L _- .281 $-a HIN RAD 3/16 - 30 IIS-U SBXT
12、uPLa lliREAD LUD .2000 .OU IltLlU Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I 3.l.3 -Initiai tension.- The lnital tension (earin pressure), ileasurd in occorame with the procedure specified herein, shall be not less than 30 poimis, (See b.h.3.)
13、 3.ll.4 Rated tensile load.- The rated tensile load for the fastener srall ba Ir00 wund. (be 4.4.4.) 3.l.5 Panel and nut-strip separation,- The panel and nut-strip separation shall not exceed 3/6mund;Lnches. (See 4.b.7.) 3.11.8 Tensile overload.- The fastener siia11 srlthstand without failure any te
14、nsile load up to 150 per cent of rated tensile load, five succeeding times, each of 5 seconds duration. (See h.h.8.) . 3.11.9 Nut-strip spacin.4 tolerance.- The fastener assembly shall satisfactoril:. engage pnd disengage the nut-strip.and shall operate into the locked and unlocked positions without
15、 8XCeeding tle iwth or minimum torque values snecifiea when subdected to the nut-strip stpacing tolerance test AS specified in b.4.9. 3.ll.10 ,Rated s.mar load.- The Fatui slmr load for the fastener oiiali oe 2t-n punds. 3.U.U Simu overload.- The fasteher shill wthatiin without failure any streu Lod
16、 up to 150 parcent of tile rated siuar load, five successive tiras, each of 5 seconds duration. / 3.l.U Vibration.- the fastener rimU withstand the ribtation best 88 specified in 1i.L.U without evidence of J13yge or aprirwnt. Trr Hquiromnt rnU apply lor my Iearlbh attitdo of UW, munthg of thr to8t J
17、igr (fie 9) tlut b, Vutu, horizontal, M obllquii. -. I- o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-k.2 b.2.l uualfication test sasples.- the 4uaUiccition test aaap3es shall aonslt of four length of nut-strip aa siim in figure i, each 2 feet lo
18、ngs 2 fasteners M aham in figuro 2, vurrlir fcatlon tost- dualicatim ksts ahall be wniducted it a b-nt l.burrw of 8 d08i-W by ths iroOUrIIh$ -. -10 for uamication test Name of item Rame of rienufacturer Xanufacturers part numbem Subnitted by (name) (date) for Qualification Test in accordance with th
19、e requirewnta of Specification HIL-F-8zLs for ador, ninor A, and linor B clpssei of chrracteristici bujor 1.0 porcont nhr A 2.5 percat Hinor 6 L.0 peramt 1i.3.1.1 Ins tion lot.- Unless otherwise specified, a lot for ins?ectlon purpses h.3h.2 shall be as SolzOrsT k.301.3 hfhitb Of e. Length of fasten
20、er assembly (3/b) oversize or undersize. Screw tip rrdiui (0.060) oversire or undersire. pre 5. The assembly sha be loaded and attached to tie test jig as shown in figure 9. The base of the test Jig shall be vibrated at a frequency varying between 10 and 55 cycles per second at an amplitude of O.036
21、4nch total excursion, the frequency varyin-N Rocknell superficial scale; or If fabricated of through hrdenlng steel, the heat-treated tlirough-hardened studs shall be tested on the slots, using Rockusil “C“ scale. (See 3.3. Ud the fact that the Qom- asnt may have formulated, furnished, or in any way
22、 rupplied ,. the said drawings, specifications, or other data, is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveylng any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. CUStOdEt Navy - Meau of Aeronautics Air Force Preparing activity: Air Force Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
