AIA/NAS 1672-2010 pdf download FASTENER, BLIND, INTERNALLY THREADED, EXTERNAL SLEEVE, HIGH TEMPERATURE, FLUSH HEAD, SELF-LOCKING
MATERIAL:
NUT, SCREW & SLEEVE – A-286 HEAT RESISTANT STEEL SEE PROCUREMENT SPECIFICATION.(CLASS 2)
DRIVE NUT – MILD STEEL.
FINISH:DRIVE NUT – COLOR CODED BLACKNUT,SCREW & SLEEVE – PASSIVATED,SEE PROCUREMENT SPECIFICATION.
LUBRICATION:SEE PROCUREMENT SPECIFICATION: GRAPHITE FREE DRY FILM PER MIL-PRF-81329 OR DRY FILM TOCHEMICAL REQUIREMENTS OF AS5272 WITH A TOTAL WEIGHT LOSS (TWL) LESS THAN 1% AND LESSTHAN 1% VOLATILE CONDENSABLE MATERIALS (VCM) WHEN TESTED IN ACCORDANCE WITH NASASPECIFICATION SP-R-0022 OR ASTM E 595
CODE:FIRST DASH NUMBER DESIGNATES FASTENER DIAMETER AS SHOWN IN TABLE I.SECOND DASH NUMBER DESIGNATES FASTENERS GRI AS SHOWN IN TABLE II
ADD”L”BETWEEN FIRST AND SECONDDASH NUMBER TO DESIGNATE FASTENER WITH SELF-LOCKING
PROVISIONS.
ADD “DL” BETWEEN FIRST AND SECOND DASH NUMBER TO DESIGNATE FASTENER WITH SELF-LOCKINGPROVISIONS AND DRIVE NUT FEATURE.ADD “B AFTER SECOND DASH NUMBER TO DESIGNATE GRAPHITE FREE DRY FILM LUBRICANT PERMIL-PRF-81329./14//16/ADD “U” AFTER SECOND DASH NUMBER TO DESIGNATE DRY FILM LUBRICANT TO THE CHEMICALREQUIREMENTS OF AS5272./15/ /16 CODE AFTER SECOND DASH NUMBER DESIGNATES LUBRICANTS (PARAFFIN WAX,CETYL ALCOHOL,ETC.) AS REQUIRED TO MEET PERFORMANCE REQUIREMENTS.
INTERCHANGEABILITY:
THE “DL” CODE FASTENERS (DRIVE NUT) AND L” CODE FASTENERS (NO DRIVE NUT) AREFUNCTIONALLY INTERCHANGEABLE. THERE IS NO DIFFERENCE IN INSTALLED CONDITION.”DL”PARTS USE EXISTING INSTALLATION TOOLING EXCEPT A NEW HEX NOSE ADAPTOR IS REQUIREDFOR THE -5DL SIZE. THE NOSE ADAPTOR CURRENTLY USED TO INSTALL NAS1669-4L ANDNAS1671-4L HEX HEAD PARTS IS USED TO INSTALL-08DL,-3DL AND -4DL SIZES THE -6DL SIZEIS INSTALLED WITH THE SAME NOSE ADAPTOR CURRENTLY USED TO INSTALL NAS1669-6L ANDNAS1671-6L HEX HEAD FASTENERSTHE WRENCH ADAPTORS WHICH ENGAGE AND ROTATE THESCREW DRIVING FLATS DURING INSTALLATION ARE THE SAME FOR L” AND DL” CODEFASTENERS THE DL” CONFIGURATION IS CONSIDERED THE PREFERRED FASTENER SYSTEM.
EXAMPLE:
NAS1672-3-5 – HIGH TEMPERATURE BLIND FASTENER, FLUSH HEAD WITH A SHANK DIAMETER OF.1980 ANDAGRIP OF .282 .344 WITH OPTIONAL DRIVING PROVISIONS.(INACTIVE FOR NEW DESIGN)
NAS1672-3L5 = HIGH TEMPERATURE BLIND FASTENER, FLUSH HEAD WITH A SHANK DIAMETER OF
.1980 AND GRIP OF .282 – 344 AND SELF-LOCKING FEATURE.
NAS1672-4DL = HIGH TEMPERATURE BLIND FASTENER, FLUSH HEAD WITH A SHANK DIAMETER OF.2590 AND GRIP OF 345 – .406, SELF-LOCKING FEATURE AND DRIVE NUT FEATURE.
NAS1672-4DL6B = HIGH TEMPERATURE BLIND FASTENER,FLUSH HEAD WITH A SHANK DIAMETER OF.2590 AND A GRIP OF 345 – 406SELF-LOCKING AND DRIVE NUT FEATURE ANDGRAPHITE FREE DRY FILM LUBE PER MIL-PRF-81329.
NOTES:
‘G”IS THE MEAN DIMENSION TO THE NU NOSE ANGLE INTERSECTIONTHIS INTERSECTIONLOCATION MAY VARY AROUND THE PERIPHERY DUE TO ECCENTRICITY.
PARTS SHALL BE FREE OF ALL LOOSE OR HANGING BURRS
OUTSIDE DIAMETER OF HEAD OF SCREW AND OUTSIDE DIAMETER OF SLEEVE SHALL NOT BEGREATER THAN MAXIMUM“OD”
CONCENTRICITY OF NUT HEAD CONICAL SURFACE TO OD SHALL BE WITHIN .005 FIMEXCEPT IN SELF-LOCKING AREA./9/
TEMPERATURE LIMITATION: 1200°F MAX
REFER TO NAS518 FOR FLUSHNESS GAGING DETAILS
HEAD MARKINGS DEPRESSED .010 MAX.
LOCKING FEATURE CONSISTS OF THREE (3) SPHERICAL INDENTATIONS LOCATED 120° APARTON THE PERIPHERY OF THE NUT COMPONENT AND APPROXIMATELY .040 ABOVE THEINTERSECTION OF THE NUT NOSE ANGLE AND O.D.(MEAN GRIP OF FASTENER)
DISTORTION OF “OD SHALL NOT EXCEED OD” MAX +001, FASTENERS MANUFACTUREDPRIOR TO 1JANUARY 1988 SHALL NOT EXCEED “OD”MAX +.002.

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