AIA/NAS 1780-2011 pdf download NUT, SELF-LOCKING, PLATE, TWO LUG, LOW HEIGHT, 1 00° CSK, 1 60 KSI, 450 °F, 800 °F
MATERIAL: STEEL – CARBON OR ALLOY HEAT TREATED SAE1030 OR BETTER; NEITHER THE SULFUR NOR PHOSPHORUS CONTENT SHALL EXCEED .050% BY WEIGHT.
CRES – A286 (UNS S66286) PER AMS5525, AMS5732 OR AMS5737. /1 0/
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 MIN 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 PER AMS2700, METHOD 1 , CLASS 4 ALL CRES PARTS BEFORE THE APPLICATION OF DRY FILM LUBRICANT.
LUBRICANT: MOLYDISULFIDE (MoS 2 ) DRY FILM LUBRICANT PER NAS3356.
CODE: “-” STEEL, CADMIUM PLATED WITH DRY FILM LUBRICANT.
“C” IN PLACE OF DASH INDICATES CRES NUTS WITH SILVER PLATE.
“K” SUFFIXED TO THE DASH NUMBER INDICATES DIMPLED RIVET HOLES.
“M” SUFFIXED TO THE DASH NUMBER INDICATES CRES NUTS, WITHOUT SILVER PLATE, WITH DRY FILM LUBRICANT.
“W” SUFFIXED TO THE DASH NUMBER INDICATES PROJECT WELD NIBS FOR CRES SILVER PLATED PARTS ONLY (NO SILVER PLATE ON WELD NIBS).
“X” IN PLACE OF DASH INDICATES CADMIUM PLATED NUTS WITHOUT DRY FILM LUBRICANT.
EXAMPLES OF PART NUMBERS:
NAS1 780 X 4 K
MATERIAL CODE (SEE CODE SECTION)
THREAD (SEE TABLE I)
MATERIAL CODE (SEE CODE SECTION)
BASIC NUMBER
STEEL
NAS1 780-4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT.
NAS1 780-4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT.
NAS1 780X4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT.
NAS1 780X4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT.
CRES
NAS1 780C4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, SILVER PLATED.
NAS1 780C4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, SILVER PLATED.
NAS1 780C4W = .2500-28 UNJF-3B THREAD, WELD NIBS, SILVER PLATED.
NAS1 780C4M = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, DRY FILM LUBRICATED.
NAS1 780C4MK = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, DRY FILM LUBRICATED.
NOTE:
(1 ) DIMENSIONS IN INCHES AND APPLY AFTER FINISH AND PRIOR TO THE APPLICATION OF LUBRICATION UNLESS OTHERWISE SPECIFIED.
/2/ MINIMUM “E” LIMITED ONLY BY STRENGTH REQUIREMENTS OF SPECIFICATION.
/3/ THE CENTER OF THE TAPPED HOLE SHALL NOT DEVIATE IN ANY DIRECTION FROM THE CENTER OF THE PLATE NUT, AS DETERMINED BY THE BASIC RIVET HOLE LOCATION, BY MORE THAN .005.
/4/ THREADS IN ACCORDANCE WITH AS8879 BEFORE LUBRICATION.
(5) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.
(6) UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THE APPLICABLE DRAWING OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED.
(7) REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
(8) REMOVE ALL BURRS AND SHARP EDGES.
(9) DIMENSIONING AND TOLERANCING PER ANSI Y1 4.5M-1 982.
/1 0/ 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.
PROCUREMENT SPECIFICATION: STEEL NUTS – NAS3350, CLASS II.

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