AIA/NAS 1291-2010 pdf download NUT, SELF-LOCKING, HEXAGON- LOW HEIGHT, LIGHT WEIGHT
NOTES:
/1 / MINIMUM TENSILE STRENGTH FOR STEEL (450°F) NUT PER TABLE IS BASED ON 1 60,000 PSI AND ON AREAS CALCULATED BY USING 98% OF THE BASIC PITCH DIAMETER AS SHOWN IN TABLES 8 AND 9 OF ASME B1.1 , EXCEPT .3750 AND LARGER SIZES WHICH ARE BASED ON 1 00%. TEST BOLTS SHALL BE 1 80,000 PSI MIN. TENSILE VALUES FOR A286 ARE BASED ON 1 25,000 PSI PER NASM25027 .
/2/ COUNTERSINK, COUNTERSINK-COUNTERBORE OR RADIUS RELIEF TO THREAD WITHIN LIMITS OF “ØD”DIAMETER AND 1 20° MAX. ANGLE.
/3/ THREADS IN ACCORDANCE WITH AS8879 BEFORE LUBRICATION.
/4/ MAGNETIC PERMEABILITY OF A286 NUTS SHALL BE LESS THAN 2.0 (AIR = 1 .0) FOR A FIELD STRENGTH H = 200 OERSTEDS USING A MAGNETIC PERMEABILITY INDICATOR PER A 342/A 342M OR EQUIVALENT.
(5) MINIMUM “GO” THREAD GAGE PENETRATION SHALL BE 3/4 REVOLUTION BEFORE DRY FILM LUBRICANT.
/6/ BEARING SURFACE MUST BE SQUARE WITH PITCH DIAMETER WITHIN “S” WHEN MEASURED IN ACCORDANCE WITH NASM25027 .
/7/ IDENTIFICATION MARKING ON DASH NUMBERS 3 (.1 900-32) AND SMALLER AT MANUFACTURER’S OPTION.
(8) DASH NUMBER 8 (.5000-20), DASH NUMBER 9 (.5625-1 8), AND DASH NUMBER 1 0 (.6250-1 8) NUTS NOT INTENDED FOR USE WITH SHORT THREAD SCREWS OR BOLTS.
/9/ NAS1 291 -02 THROUGH -6 AND NAS1 291 X02 THROUGH X6 ARE INACTIVE FOR NEW DESIGN. SEE NASM21 042
/1 0/ NAS1 291 C04 THROUGH C6 ARE INACTIVE FOR NEW DESIGN. SEE NASM21 043.
/1 1 / ALL NUTS MANUFACTURED AFTER DECEMBER 1 , 1 991 SHALL MEET MARKING REQUIREMENTS.
EXAMPLES OF PART NUMBERS: NAS1 291 -7 = .4375-20 NUT, ALL METAL CONSTRUCTION OF STEEL, CADMIUM PLATED WITH AN APPROVED DRY FILM LUBRICANT FOR 450°F USE.
NAS1 291 X7 = .4375-20 NUT, ALL METAL CONSTRUCTION, CADMIUM PLATED,WITHOUT DRY FILM COATING OR ANY OTHER LUBRICANT FOR 450°F USE.
NAS1 291 C7M= .4375-20 NUT, ALL METAL CONSTRUCTION OF A286, WITH AN APPROVED DRY FILM LUBRICANT FOR 450°F USE.
NAS1 291 C7 = .4375-20 NUT, ALL METAL CONSTRUCTION OF A286, SILVER PLATED FOR 800°F USE WITH NO LUBRICANT.

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