AIA/NAS 1831-2010 pdf download POST, ELECTRICAL, MECHANICAL EQUIPMENT
CODE: A = ALUMINUM ALLOY, ANODIZED
AC = ALUMINUM ALLOY, CHEMICAL CONVERSION COATED
B = BRASS, CADMIUM PLATED
BT = BRASS, TIN PLATED
C = CORROSION RESISTANT STEEL, PASSIVATED
, VA 22209
H = NYLON
– = STEEL, CADMIUM PLATED
EXAMPLE OF PART NUMBERS:
NAS1831 – 3A 08
LENGTH, .500 (CODE IN 16THS OF AN INCH, TABLE II)
TYPE, .188 HEX, .0860-56 UNC-2B THREAD (SEE TABLE II)
MATERIAL, STEEL, CADMIUM PLATED
DOCUMENT NUMBER
NAS1831AC4C12 = ALUMINUM, CHEMICAL CONVERSION, .250 HEX, .1380-32 UNC-2B THREAD,.750 LONG
NAS1831C6E36 = CRES, PASSIVATED, .375 HEX, .1900-32 UNF-2B THREAD, 2.250 LONG
NAS1831B4C12 = BRASS, CADMIUM PLATED, .250 HEX, .1380-32 UNC-2B THREAD, .750 LONG
NAS1831H3B08 = NYLON, .188 HEX, .1120-40 UNC-2B THREAD, .500 LONG
NOTES: (1) DIMENSIONS ARE IN INCHES AND APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED.
/2/ THREADS PER MIL-S-7742, CLASS 2B (UNC OR UNF). COUNTERSINK FOR THREAD RELIEF TO MAXIMUM MAJOR THREAD DIAMETER +.020/ −.000.
(3) REMOVE ALL BURRS AND SHARP EDGES.
(4) MAXIMUM DEPTH OF TAP DRILL HOLE IS OPTIONAL. POSTS MAY BE THREADED THEIR ENTIRE LENGTH.
(5) DIMENSIONING AND TOLERANCING PER ANSI Y14.5M-1982.
(6) UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THE APPLICABLE DRAWING OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED.
(7) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.
(8) REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
/9/ WHEN OVERALL LENGTH “L” PERMITS.

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