AIA/NAS 1676-2011 pdf download WASHER, LOCK, SPRING, HELICAL, HI-COLLAR
MATERIAL:
STEEL -CARBON COMP 1060 (UNS G10600) TO 1080 (UNS G10800) IN ACCORDANCE WITH FED-STD-66PROCUREMENT SPECIFICATION,HAVING A HARDNESS OF 45-53 HRC.
CRESCOMP 300 SERIES (UNS S30300) TO (UNS S30323) IN ACCORDANCE WITH FED-STD-66PROCUREMENT SPECIFICATION, HAVING A HARDNESS OF 35-5 HRCMAGNETIC PERMEABILITYSHALL BE LESS THAN 2.0 (AIR = 1.0) FOR A FIELD STRENGTH H 200 OERSTEDS USING AMAGNETIC PERMEABILITY INDICATOR PER ASTM A 342/A 342MTEST METHOD 3
FINISH:
STEEL -CADMIUM PLATE PER AMS-QQP-416,TYPE IICLASS 2CADMIUM PLATE WITH BLACK CHROMATE DIP PER AMS-QQ-P-16, TYPE IL, CLASS 2 (EXCEPT FORCOLOR).
CRES- PASSIVATE PER AMS2700.METHOD 1CLASS 4.BLACK OXIDE PER MIL-DTL-13924.CLASS 4
CODE:
“_”BETWEEN BASIC NUMBER AND DASH NUMBER INDICATES STEEL MATERIAL“C”BETWEEN BASIC NUMBER AND DASH NUMBER INDICATES CRES MATERIAL.“P” FOLLOWING DASH NUMBER INDICATES BLACK CHROMATE DIP FOR CADMIUM PLATED WASHERS ORBLACK OXIDE FOR CRES WASHERS.
EXAMPLE OF PART NUMBER:
NOTES:
NAS1676-416 = WASHER FOR 1/4 SIZE SCREWSTEEL.CADMIUM PLATEDNAS1676-416P WASHER FOR 1/4 SIZE SCREW,STEEL, CADMIUM PLATED WITH BLACK CHROMATE DIPNAS1676C416 = WASHER FOR 1/4 SIZE SCREWCRESPASSIVATED.NAS1676C416P = WASHER FOR 1/4 SIZE SCREW,CRES WITH BLACK OXIDE
(1) THESE WASHERS ARE PRIMARILY INTENDED FOR USE WITH SOCKET HEAD CAP SCREWS (1960 SERIES)SUCH AS NAS1351 AND NAS1352.
(2) REMOVE ALL BURRS
(3) DIMENSIONS IN INCHES AND APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED
(4) SEE AND10476 FOR LIMITATIONS ON USAGE OF LOCKWASHERS IN AIRFRAME CONSTRUCTION.
(5) DASH NUMBERS 716 AND 816 SUPERSEDE DASH 171 AND 818 RESPECTIVELY.
(6) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN
(7) UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THEAPPLICABLE DRAWING OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED.
(8) REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
(9) DIMENSIONING AND TOLERANCING PER ANSI Y14.5M-1982.

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