AIA/NAS 1779-2011 pdf download NUT, SELF-LOCKING, PLATE, TWO LUG, LOW HEIGHT, CBORED, FLOATING, REDUCED RIVET SPACING, 1 60 KSI, 450 °F, 800 °F
MATERIAL:
STEEL – CARBON OR ALLOY HEAT TREATED SAE1 030 OR BETTER; NEITHER THE SULFUR NOR PHOSPHORUS CONTENT SHALL EXCEED .050 PERCENT BY WEIGHT.
CRES – A286 PER AMS5525, AMS5732 OR AMS5737.
FINISH:
STEEL – CADMIUM PLATE PER AMS-QQ-P-41 6, TYPE II, CLASS 2.
CRES – SILVER PLATE FOR 800 °F USE PER AMS241 0 TO A .0002 MINIMUM THICKNESS ON SURFACE WHICH CAN BE TOUCHED BY A Ø.750 BALL. THREADS SHALL SHOW COMPLETE COVERAGE, BUT THICKNESS REQUIREMENTS ON THREADS IS WAIVED. PASSIVATE ALL CRES PARTS PER AMS2700 BEFORE THE APPLICATION OF DRY FILM LUBRICANT.
LUBRICANT:
MOLYDISULFIDE (MoS 2 ) DRY FILM LUBRICANT PER NAS3356. THE INCLUSION OF A LUBRICANT ON THE BASKETS OF DRY FILM LUBRICATED NUTS IS OPTIONAL.
CODE:
“-” STEEL, CADMIUM PLATED WITH DRY FILM LUBRICANT AND NUTS WITH OR WITHOUT EYELET.
“C” IN PLACE OF DASH INDICATES CRES NUTS WITH SILVER PLATE, WITH OR WITHOUT EYELET.
“X” IN PLACE OF DASH INDICATES CADMIUM PLATED NUTS WITHOUT DRY FILM LUBRICANT.
“M” SUFFIXED TO THE DASH NUMBER INDICATES CRES NUTS, WITHOUT SILVER PLATE, WITH DRY FILM LUBRICANT.
“R” IN PLACE OF DASH OR BEFORE “C” OR “X” INDICATES NUT TYPES WITHOUT EYELET.
“W” SUFFIXED TO THE DASH NUMBER SPECIFIES PROJECTION WELD NIBS FOR CRES SILVER PLATED PARTS CODED “R” ONLY.
NO SILVER PLATE ON WELD NIBS.
EXAMPLES OF PART NUMBERS:
NAS1 779 R C 4 W
WELD NIBS CODE (SEE CODE SECTION)
DASH NUMBER (SEE TABLE I)
INCLUDES:
MATERIAL CODE (SEE CODE SECTION)
AND
EYELET CODE (SEE CODE SECTION)
BASIC NUMBER
STEEL
NAS1 779-4 = .2500-28UNJF-3B THREAD, CADMIUM PLATED WITH DRY FILM LUBRICANT, WITH OR WITHOUT EYELET.
NAS1 779R4 = .2500-28UNJF-3B THREAD, CADMIUM PLATED WITH DRY FILM LUBRICANT, WITHOUT EYELET.
NAS1 779X4 = .2500-28UNJF-3B THREAD, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT, WITH OR WITHOUT EYELET.
CRES
NAS1 779C4 = .2500-28UNJF-3B THREAD, SILVER PLATED, WITH OR WITHOUT EYELET.
NAS1 779RC4 = .2500-28UNJF-3B THREAD, SILVER PLATED, WITHOUT EYELET.
NAS1 779RC4W = .2500-28UNJF-3B THREAD, WELD NIBS, SILVER PLATED, WITHOUT EYELET.
NAS1 779C4M = .2500-28UNJF-3B THREAD, DRY FILM LUBRICATED, WITH OR WITHOUT EYELET.
NOTES:
/1 / MINIMUM “E” LIMITED ONLY BY STRENGTH REQUIREMENTS OF SPECIFICATION.
/2/ FLOAT OF NUT PORTION OF ASSEMBLY SHALL NOT BE LESS THAN .020 LATERALLY AND LONGITUDINALLY FROM CENTERED POSITION. NUT BODY SHALL BE CAPABLE OF ENGAGEMENT WITH A BOLT IN THE MAXIMUM MISALIGNED POSITION.
/3/ THREADS IN ACCORDANCE WITH AS8879 BEFORE LUBRICATION.
/4/ THE ASSEMBLY SHALL PROVIDE A BEARING SURFACE FOR THE NUT WITHIN THE HOUSING. THE NUT AND BASE PORTION OF THE ASSEMBLY SHALL FORM ONE INTEGRAL UNIT.
(5) MAGNETIC PERMEABILITY SHALL BE LESS THAN 2.0 (AIR = 1 .0) FOR A FIELD STRENGTH H = 200 OERSTEDS USING A MAGNETIC PERMEABILITY INDICATOR PER ASTM A 342/A 342M, TEST METHOD 3.
(6) DIMENSIONING AND TOLERANCING PER ANSI Y1 4.5M-1 982.
(7) DIMENSIONS IN INCHES AND APPLY AFTER FINISH AND PRIOR TO THE APPLICATION OF LUBRICATION UNLESS OTHERWISE SPECIFIED.
(8) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.

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