AIA/NAS 4121-2012 pdf download HEAT SINK, ELECTRICAL, ELECTRONIC COMPONENT, SEMICONDUCTOR DEVICES, FORMED
MATERIAL:
ALUMINUM SHEET OR PLATE: 1 1 00 (UNS A91 1 00), 3003 (UNS A93003), 5052 (UNS A95052),
6061 (UNS A96061 ) PER AMS-QQ-A-250.
DIE-CAST ALUMINUM PER ASTM B85/B85M, AMS4290, OR SAE J452.
FINISH:
BLACK ANODIZE CONFORMING TO TYPE I OR TYPE II OF MIL-A-8625.
INSULATING COATING (ELECTRICAL INSULATION UP TO 500 V DC).
HARD ANODIZE COATING CONFORMING TO TYPE III OF MIL-A-8625. THIS FINISH SHALL HAVE A MINIMUM THICKNESS OF .001 INCH HARD ANODIZE COATING AND SHALL BE SODIUM DICHROMATE SEALED. THROUGH-HOLES, SHARP EDGES, AND THREADS MAY BE FURNISHED FREE OF ANODIZE, BUT IN SUCH CASES THESE SURFACES SHALL RECEIVE A CHEMICAL CONVERSION COATING IN ACCORDANCE WITH MIL-DTL-5541 , CLASS 3. THIS FINISH TYPICALLY PROVIDES 200 V DC PUNCTURE RESISTANCE PER FILM COAT. GOLD CHROMATE IN ACCORDANCE WITH MIL-DTL-5541 , CLASS 3.
CODE:
“B” INDICATES BLACK ANODIZE.
“D” INDICATES INSULATING COATING.
“L” INDICATES HARD ANODIZE COATING.
“M” INDICATES GOLD CHROMATE.
NO CODE INDICATES NO FINISH.
EXAMPLE OF PART NUMBER:
NAS41 21 -001 B = FORMED HEAT SINK MADE OF ALUMINUM ALLOY WITH BLACK ANODIZE
FINISH.
FINISH CODE
DASH NUMBER
BASIC PART NUMBER
NOTES:
(1 ) DIMENSIONS IN INCHES AND APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED.
(2) DIMENSIONING AND TOLERANCING PER ANSI Y1 4.5M-1 982.
(3) TOLERANCES ON CONFIGURATION DIMENSIONS (FIGURE 1 ) UNLESS OTHERWISE SPECIFIED:
DECIMALS ± .01 7, ANGLES ± 2°. A .062 RADIUS IS PERMITTED ON CORNERS AND EDGES.
TOLERANCES ON MOUNTING HOLE DIMENSIONS (FIGURE 2) UNLESS OTHERWISE SPECIFIED:
DECIMALS ± .01 0, ANGLES ± 2°.

Share on Facebook

Post on X

Follow us

Save