AIA/NAS 1770-2011 pdf download NUT, SELF-LOCKING, PLATE, TWO LUG, LOW HEIGHT, CBORE, 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% 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 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 ALL CRES PARTS PER AMS2700 BEFORE THE APPLICATION OF DRY FILM LUBRICANT.
LUBRICANT:
MOLYDISULFIDE (MoS 2 ) DRY FILM LUBRICANT PER NAS3356.
CODE:
“-” STEEL, CADMIUM PLATED WITH DRY FILM LUBRICANT.
“X” IN PLACE OF DASH INDICATES CADMIUM PLATED NUTS WITHOUT 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).
EXAMPLES OF PART NUMBERS:
NAS1 770 C 4 M K
ATTACHMENT CODE (SEE CODE SECTION)
FINISH CODE (SEE CODE SECTION)
DASH NUMBER FROM TABLE I
MATERIAL CODE (SEE CODE SECTION)
BASIC PART NUMBER
STEEL
NAS1 770-4 = .2500-28UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT.
NAS1 770-4K = .2500-28UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT
NAS1 770X4 = .2500-28UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT.
NAS1 770X4K = .2500-28UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT.
CRES
NAS1 770C4 = .2500-28UNJF-3B THREAD, PLAIN RIVET HOLES, SILVER PLATED.
NAS1 770C4K = .2500-28UNJF-3B THREAD, DIMPLED RIVET HOLES, SILVER PLATED.
NAS1 770C4W = .2500-28UNJF-3B THREAD, WELD NIBS, SILVER PLATED.
NAS1 770C4M = .2500-28UNJF-3B THREAD, PLAIN RIVET HOLES, DRY FILM LUBRICATED.
NAS1 770C4MK = .2500-28UNJF-3B THREAD, DIMPLED RIVETS HOLES, DRY FILM LUBRICATED.
NOTES:
/1 / MINIMUM “E” LIMITED ONLY BY STRENGTH REQUIREMENTS OF SPECIFICATION.
/2/ 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.
/3/ THREADS IN ACCORDANCE WITH AS 8879 BEFORE LUBRICATION.
(4) DIMENSIONS IN INCHES AND APPLY AFTER FINISH AND PRIOR TO THE APPLICATION OF LUBRICATION UNLESS OTHERWISE SPECIFIED
(5) MAGNETIC PERMEABILITY SHALL BE LESS THAN 2.0 (AIR 1 .0) FOR A FIELD STRENGTH = 200 OERSTEDS USING A MAGNETIC PERMEABILITY INDICATOR PER ASTM A 342/A 342M MIL-I-1 721 4 OR EQUAL.

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