AIA/NAS 1771-2013 pdf download NUT, SELF-LOCKING, PLATE, ONE LUG, LOW HEIGHT, CBORED, 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.
FINISH:
STEEL: CADMIUM PLATE PER AMS-QQ-P-416, TYPE II, CLASS 2.
CRES: SILVER PLATE FOR 800 °F USE PER AMS2410 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.
LUBRICATION:
MOLYBDENUM DISULFIDE (MoS 2 ) DRY FILM LUBRICANT PER NAS3356.
CODE:
“-” INDICATES 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 PROJECTION 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 NUMBER:
STEEL:
NAS1771-4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT
NAS1771-4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED WITH DRY FILM LUBRICANT
NAS1771X4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT
NAS1771X4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, CADMIUM PLATED AND WITHOUT DRY FILM LUBRICANT
CRES:
NAS1771C4 = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, SILVER PLATED
NAS1771C4K = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, SILVER PLATED
NAS1771C4W = .2500-28 UNJF-3B THREAD, WELD NIBS, SILVER PLATED
NAS1771C4M = .2500-28 UNJF-3B THREAD, PLAIN RIVET HOLES, DRY FILM LUBRICATED
NAS1771C4MK = .2500-28 UNJF-3B THREAD, DIMPLED RIVET HOLES, DRY FILM LUBRICATED