AIA/NAS M35649:2008 pdf download NUT, PLAIN, HEXAGON, MACHINE SCREW, UNC-2B
FINISH: CARBON STEEL – CADMIUM PLATING PER AMS-QQ-P-41 6, TYPE II, CLASS 2.
PHOSPHATE COATING PER PROCUREMENT SPECIFICATION.
CRES – PASSIVATED PER AMS2700, METHOD 1 , TYPE 2 FOR 302 CRES AND TYPE 6 OR 7 FOR ALL OTHER 300 SERIES CRES, CLASS 1 .
BLACK OXIDE COATING PER MIL-DTL-1 3924, CLASS 4.
BRASS – BLACK OXIDE COATED PER PROCUREMENT SPECIFICATION. (8)
TIN PLATED PER ASTM B 545, .0001 INCH THICK.
SILVER PLATED PER ASTM B 700, .0001 INCH THICK.
NICKEL PLATED PER PROCUREMENT SPECIFICATION.
COPPER-SILICON – NONE.
PART NUMBER: THE PART NUMBER SHALL CONSIST OF THE BASIC MS NUMBER FOLLOWED BY A DASH NUMBER TAKEN FROM TABLE I, FOLLOWED BY THE FINISH CODE LETTERS (“B” FOR BLACK OXIDE), (“N” FOR NICKEL PLATED), (“S” FOR SILVER PLATED), (“T” FOR TIN PLATED) EXCEPT THAT NO FINISH CODE SUFFIX SHALL BE PERMITTED WITH CADMIUM PLATED OR PHOSPHATE COATED CARBON STEEL.
EXAMPLE OF PART NUMBER:
MS35649 – 225 B
OPTIONAL FINISH CODE (SEE FINISH SECTION)
“B” BLACK OXIDE (APPLICABLE TO CRES AND BRASS ONLY) (8)
“N” NICKEL PLATED (APPLICABLE TO BRASS ONLY)
“S” SILVER PLATED (APPLICABLE TO BRASS ONLY)
“T” TIN PLATED (APPLICABLE TO BRASS ONLY)
NO CODE LETTER FOR CADMIUM PLATED OR PHOSPHATE COATED CARBON
STEEL (SEE TABLE I) SINCE DASH NUMBER DOES NOT ALLOW OTHER ADDITIONAL FINISH COATING.
DASH NUMBER FROM TABLE I
BASIC MS NUMBER
MS35649-225B – NUT, PLAIN, HEXAGON, MACHINE SCREW, THREAD SIZE .0860-56 UNC-2B; BRASS, BLACK OXIDE COATED.
MS35469-63 – NUT, PLAIN HEXAGON, MACHINE SCREW, THREAD SIZE .1 380-32 UNC-2B; CARBON STEEL,PHOSPHATE COATED
NOTES:
1 . DIMENSIONS ARE IN INCHES.
2. REMOVE ALL BURRS AND SHARP EDGES.
3. NUTS SPECIFIED HEREIN ARE TYPE II, STYLE 1 3 IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
4. THIS STANDARD TAKES PRECEDENT OVER STANDARDS REFERENCED HEREIN.
5. REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
NOTES (CONT’D):
6. MAGNETIC PERMEABILITY: CORROSION RESISTANT STEEL FASTENERS SHALL HAVE A MAGNETIC PERMEABILITY OF 2.00 MAXIMUM (AIR=1 .00) AT A FIELD STRENGTH OF H=200 OERSTEDS USING A MAGNETIC INDICATOR IN ACCORDANCE WITH ASTM A 342/A 342M, TEST METHOD 3.
(7) THE THREADS SHALL BE IN ACCORDANCE WITH FED-STD-H28/2. ACCEPTABILITY OF SCREW THREADS SHALL BE IN ACCORDANCE WITH FED-STD-H28/20, SYSTEM 21 .
(8) MS PART NUMBERS FOR BRASS NUTS SINCE MS35649 REVISION F HAVE REQUIRED A “B” IN THE PART NUMBER TO INDICATE BLACK OXIDE COATING. PRIOR TO MS35649 REVISION F, PAST REVISIONS DID NOT REQUIRE THE “B” IN THE BRASS NUT PART NUMBER TO DENOTE BLACK OXIDE COATING. IN EITHER CASE i.e., FORMER PRACTICE (WITHOUT THE “B”) OR PRESENT PRACTICE (WITH “B”) THE MS35649 PART NUMBER FOR BRASS NUTS REQUIRE BLACK OXIDE COATING.
9. DIMENSIONS APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED.
1 0. DIMENSIONING AND TOLERANCING PER ANSI Y1 4.5M-1 982.

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