NAS1474 ETC
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_ Mj Aerospace DN AEE Industries NATIONAL AEROSPACE STANDARD Association © coPrmIGHT1991 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FED, SUP CLASS 5310 MARK WITH MANUFACTURERS IDENTIFICATION. X_ LOCATION OPTIONAL g i 0 e SEE NOTE 5 & ia
3 Vas
E a ner NN ( THREAD RELIEF )
085 MAX
3 whe; NUT. TAX. 020 MAX SEAL PROTRUSION FROM . <3) SHELL. tf MOUNTING SURFACE OF SHELL 3 i! > 3 S O.. T PRA a 14 STIFFENING NS A - FLANGE G t-- r) 3 ) eae f ry OF PART Sway af NUMBER) WA 8: gsz WASHER: °S) Ssx8 i - XH / — SEAL 3ea25 r} pe THREAD T 32 098 DIA Bath pre oe 4 (MAX BOLT END PROTRUSION)
3 He ‘SQUARE SHAPED SECTION A-A
as . Hi THREAD aot T ‘5.002 [Erizo-wowsceye [on | uz] [gos | ze . Fe & THREAD WEIGHT/100
85 T LBS APPROX
5: es ee ae [~.T3B0-32UNIC= 38 pte T = 5 owe MATERIAL: NUT = STEEL,SEE PROCUREMENT SPECIFICATION. CRES.AMSS525(UNS S66286) OR AMS5732 (UNS 66286) ,A-286,NON—MAGNETIC a rare SHELL - STEEL,SEE PROCUREMENT SPECIFICATION. CRES,AMSS525(UNS S66286),A-Z286.NON-MAGHETIC a Bez WASHER - ALUMINUM ALLOY OR STEEL,SEE PROCUREMENT SPECIFICATION, CRES,AMSSS25(UNS- $66286) OR AMSS732 (UNS S66286) a BES ‘A-286.NON-MAGNETIC. i ud SEAL = 2250F: RUBBER, MIL-R-GB55,CLASS 1,GRADE 60, OUROMETER AGO, COLOR BLACK az - 350,F: FLUOROSILICONE RUBBER, MIL-R-25988, TYPE 11, CLASS 1, DUROMETER A7O, COLOR BLUE 385 = 450°F: SILICONE RUBBER, AMS3304, DUROMETER A70, COLOR RED 28 FINISH: STEEL NUT, SHELL AND WASHER-CADMIUM PLATE PER QQ-P-416, TYPE Il, CLASS 2. 8 es CRES NUT, SHELL AND WASHER-CLEAN AND PASSIVATE PER MIL-S-5002, WHEN CODED C(SEE SHEET 2), NUT-SILVER PLATE PER Szt MIL-N-25027 TO A MINIMUM THICKNESS ON SURFACES WHICH CAN BE TOUCHED BY A .7500(3/4 - INCH) BALL; ges TREADS SHALL SHOW COMPLETE COVERAGE BUT THICKNESS REQUIREMENT OW THREADS IS WAIVED © Bee ALUMINUM ALLOY WASHER - ANODIZE OR CHEMICAL FILM PER HIL-N-25027,EXCEPT AMODIZE SHALL BE LIMITED TO TYPE 1 y 525 ‘OR TYPE 11. APPROVED DRY FILM LUBRICANT ON NUTS WHEN CODED AS EXPLAINED ON SHEET 2. 5 3b i 38u Bae LIST OF CURRENT SHEET! 3 Prd [wo J Rev. & THIRD. ¥ CUSTODIAN NATIONAL AEROSPACE STANDARDS COMMITTEE ANGLE 3 PROJECTION o PROCUREMENT THE CLASSIFICATION Z SPECIFICATION STAMDARO PART g MIL-N-25027 NUT, SELF-LOCKING, PLATE-TWO LUG, & EXCEPT AS NOTED CAP, FLOATING, REDUCED RIVET SPACING NAS 1474 SHEET 1 OF 3 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSP/ STANDARI Cee ae ANCE OF aNY PARTELAR NPPLICATION OR th IME ASTENGE OF OR APPLICABILITY THIERETO.Or PATENT ON TAADEMARK RIGHTS.
a M™ Aerospace IN AE Industries NATIONAL AEROSPACE STANDARD Association © copyright 1951 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC, ALL PIGHTE RESERVED i EXAMPLE OF PART NUMBER & WASIATS A 08 = SELF-LOCKING PLATE NUT WITH STEEL MUT AND SHELL, ALUMINUM ‘ALLOY OR STEEL WASHER, FUEL RESISTANT RIL-RoG8SS SEAL é (225°F), .1640-32 THREAD, ORY FILM LUBRICATED KeSTIFFENING FLANGE REQURED NESTIFFENING FLANGE PROHIBITED NO SUFFIX LETTER*STIFFENING FLANGE AT MANUFACTURERS OPTION ff DASH NUNBER AS TABULATED g A» STEEL NUT AND SHELL WITH ALUMINUM Pai OR STEEL WASHER, FUEL RESISTANT MIL-R-685S SEAL (225°F), ORY FILM LUBRICATED & X ~ SANE AS "A" WITHOUT ORY FILM LUBRICANT g S © STEEL MUT, SHELL AND WASHER, FUEL RESISTANT MIL-R-25988 SEAL (350°F), ORY FILM LUBRICATED ‘Yo = SAME AS "'S WITHOUT ORY FILM LUBRICANT C = CRES NUT (SILVER PLATED), SHELL (AND WASHER, NON-FUEL RESISTANT ANS3304 SEAL (4i50°F) ‘R= CRES WUT, (SHELL AND WASHER, FUEL RESISTANT MIL-R~6855 SEAL (225°F), ORY FILM LUBRICATED F = CRES NUT, SHELL AND WASHER, FUEL RESISTANT MIL-R-25988 SEAL (350°F), ORY FILM LUBRICATED DOCUMENT NUMBER FLOAT: MINIMUM RADIAL FLOAT .015. MAXIMUM AXIAL FLOAT 030. zz PRESSURE RANGE: 0 TO 50 PSIG,
58 TEMPERATURE RANGE: MIL-R-GBSS RUBBER (-65°F TO 25°F),
& MIL-R-25988 FLUOROSJL COME RYOBER (65°F To 350°F). 35 ‘AMS3304 RUBBER (-65°F TO 4S0°F).. 33 THREADS: THREADS IN ACCORDANCE WITH MIL-S-8879 BEFORE LUBRICATION. ge WARKING: THE SMALLEST CONTAINER USED TO PACKAGE "AM, ‘x! AND \\'R" CODED PARTS SHALL uo BE MARKED WITH THE CURE DATE (QUARTER AND YEAR) OF THE OLDEST RUBBER SEAL a5 ® _—COMTAIMED THEREIN. | THE AGE OF RUBBER SEALS SMALL NOT EXCEED 20 QUARTERS
4 AT THE TIME OF DELIVERY TO THE CONTRACTOR,
=2 a id EN Ha Fd NOTES: 1, THREAD ELEMENT SHALL BE CAPABLE OF ENGAGEMENT WITH A SOLT IN THE MAXIMUM we owz MISALIGNED POSITION. ges 2, NUT AMD SHELL SHAPE OPTIOMAL, WITHIN SPECIFIED MAXIMUM DIMENSIONS. d it 4 3. HAGHETIC PERMEABILITY OF CRES UTS SHALL BE LESS THAN 2.0 (AIR = 1.0) FOR 2 ‘AFIELD STRENGTH H = 200 OERSTEDS, MAGNETIC PERMEABILITY INDICATOR PER 225 = MIL-1-17214 OR EQUIVALENT. Z ? 4, WACA RIVETING METHOD FOR ATTACHMENT WOT TO BE USED. w ge © 5. B DIMENSION MAY BE .015 LARGER THAN MAX VALUES SHOWN IN TABLE FOR ITEMS WITH N zs K SUFFOXSTIFFENING FLANGE REQUIREDDONLY. © oe Ps 23 g 288 & 28a giz #2 i ij g NAS 1474 ‘SHEET 2 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION RESPECTING ‘THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION, OR (2) THE | DISTENGE OF OR APUG AGI TRERETO OF PATENT ON TAADER OPES OATS,
NATIONAL AEROSPACE STANDARD PERFORMANCE: QUALIFICATION TEST
1.0 ALL REQUIREMENTS OF MIL-N-25027 PERTAINING TO STEEL FLOATING PLATE
nee NUTS INCLUDING AXIAL STRENGTH REQUIREMENTS OF TABLE | FOR REGULAR ose STEEL NUTS, SHALL APPLY TO THIS PART EXCEPT THE MAXIMUM TEMPERATURE 7s SHALL BE 225°F,350°F AND 450°F, AS APPLICABLE. A POSITIVE SEAL Ey? SHALL BE REQUIRED AFTER TESTING PER PARAGRAPH 3.9(PUSH OUT) AND Fed ® 3.8.3(TORQUE OUT) OF MIL-N-25027. THE PUSH OUT AND TORQUE OUT TESTS
5 SHALL BE CARRIED TO A PROOF LOAD EQUAL TO THE REQUIREMENT FOR THE
35 APPLICABLE SIZE. ALL TESTS SHALL BE PERFORMED ON A SINGLE SHEET bt OF 2024-T3 OR 7075-T6 ALUMINUM ALLOY, NOMINAL THICKNESS OF .312 BY INCHES, AND HAVING A MINIMUM OF TEN (10) INCHES SQUARE (100 SQUARE ¥e0 INCHES) UNSUPPORTED AREA, SIX(6) NUTS SHALL BE EQUALLY SPACEO ON EF A CIRCLE HAVING A DIAMETER OF SEVEN AND ONE HALF (7-1/2) INCHES. wed THE NUTS SHALL BE ATTACHED TO THE PLATE 8Y SOCKET HEAD CAP SCREWS ee THREADED INTO BLIND HOLES TAPPED TO A DEPTH OF APPROXIMATELY .218 355 INCHES WITH #3-4B SCREWS. THE #3-48 SCREWS SHALL BE SEATED TO Bee FOURTEEN (14) INCH-POUNDS. INSTALL BOLTS IN NUTS USING A SEATING $36 TORQUE THREE (3) TIMES THE MAXIMUM LOCKING TORQUE OF MIL-N-25027. ae THREE (3) NUTS SHALL BE TESTED WITH BOLTS INSTALLED AND THREE (3) fe NUTS WITH BOLTS REMOVED. 238 2.0 A POSITIVE SEAL SHALL BE CONSIDERED TO MEAN NO LEAKAGE BY VISUAL 4e8 EXAMINATION, USING DYED LIQUID, WHEN SUBJECTED TO A STATIC Fag DIFFERENTIAL PRESSURE OF 50 PSI +2 -0 PSI FOR A PERIOD OF FIVE oe 15) MINUTES MINIMUK. THE LIQUIDS USED SHALL BE FUELS CONFORMING 5 © TO MIL-J~5624 OR TT-S-735, TYPE 111, FOR 225°F AND 350°F SEALS, AND METHYL ESS ALCOHOL FOR 45O°F SEALS, IN ADDITION, A CYCLING TEST SHALL BE i PERFORMED CONSISTING OF A CYCLING PRESSURE OF BETWEEN 0 AND 50 PSI FEY FOR 1000 CYCLES. A CYCLE BEING COMPLETED APPROXIMATELY EVERY TWELVE oe (12) SECONDS. 3 2.1 8 POSITIVE SEAL SHALL BE PROVIDED AFTER AGING AN EMPTY TEST FIXTURE =o WIT NUTS MOUNTED IN A HOT AIR FURNACE AT 450°F +10°F, 350°F +10°F OR 3 gen 225°F £10°F, AS APPLICABLE FOR A PERIOD OF 4 HOURS 10 MINUTES. A 3 <59 CYCLING TEST SHALL BE PERFORMED AT TEMPERATURE WITHOUT LIQUID USING 2 Ps (6) AIR PRESSURE ALONE. THE TEST PRESSURES ANO PROCEDURES OF PARAGRAPH 3 ui8 2.0 SHALL APPLY EXCEPT THE NUMBER OF PRESSURE CYCLES SHALL BE LIMITED ° TO 100. OURING THIS PERIOD, SINCE THERE IS NO LIQUID IN THE TANK, THERE 1S NO CHECK FOR LEAKAGE. (o)
2.2 IMMEDIATELY AFTER ELEVATED TEMPERATURE TEST CYCLES, THE FIXTURE SHALL 3
BE REMOVED FROM THE FURNACE AND ALLOWED T@ "90L TO ROOM TEMPERATURE. 2 AT ROOM TEMPERATURE, LIQUID SHALL BE ADDED AND POSITIVE SEAL SHALL : BE PROVIDED IN LIQUIDS WHEN TESTED IN ACCORDANCE WITH TEST PRESSURES 3 355 AND PROCEDURES OUTLINED IN PARAGRAPH 2.0. e se 2.3 IN ADDITION, THE SAMPLES TESTED IN 2.1 SHALL PROVIDE A POSITIVE SEAL = ze AFTER A CYCLING TEST.HAS BEEN PERFORMED AS FOLLOWS: PLACE TEST FIXTURE © Bez IN A COLD BOX AT -65°F 10°F AND ALLOW TO SOAK FOR A PERIOD OF & Pd HOURS £10 MINUTES. AFTER SOAKING AT. THIS TEMPERATURE, APPLY A STATIC 3 Ff PRESSURE OF 50 PSi +5 PSI FOR A PERIOD OF ONE (1) HOUR. A CYCLING TEST 2 ees SHALL THEN BE PERFORMED BY HOLDING A PRESSURE OF SO PSI £5 PSI ON THE " ge TEST FLUID FOR A PERIOD OF TWENTY (20) SECONDS AND RELEASING PRESSURE = be FOR TEN (10) SECONDS, REPEAT THIS THIRTY (30) SECOND CYCLE FOR 120, FS at CYCLES. ALL TESTING UNDER THIS PARAGRAPH SHALL BE PERFORMED AT ~65°F w soe 10°F. = EEN gee PROCUREMENT SPECIFICATION: © Po MIL-N-25027 EXCEPT AS NOTED. ALL NUTS SHALL MEET QUALIFICATION AND INSPECTION "fo REQUIREMENTS. MANUFACTURERS SHALL PROVIDE EVIDENCE OF QUALIFICATION WHEN REQUIRED, FA 335 TESTING SHALL BE PERFORMED BY MANUFACTURER OR INDEPENDENT LABORATORY. PROCURING 3 es AGENCY MAY CONDUCT CONFIRMING QUALIFICATION TESTS, NO QPL SHALL BE ESTABLISHED. $ Fy a « Boa £23 ae a ose a 232 w # 3 a . ed NAS 1474 < SHEET 3 Published and distributed by: National Standards Association, Inc. © cooyngnt 1961. Aerospace inauawes Associaton of Amenics, Inc
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