MS35691E
REQUIREMENTS:
1. MATERIAL: STEEL, CARBON, GRADES B AND C, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
STEEL, CORROSION RESISTANT, 300 SERIES, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
BRASS, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
2. PROTECTIVE COATING AND TREATMENT:
CADMIUM PLATED, BLACK OXIDE OR PHOSPHATE COATING, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
CLEANED, DESCALED AND PASSIVATED, IN ACCORDANCE WITH ASTM A380.
NICKEL PLATED, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
3. MAGNETIC PERMEABILITY. CORROSION RESISTANT STEEL FASTENERS SHALL HAVE A MAGNETIC PERMEABILITY OF 2.0 MAXIMUM (AIR = 1.0) AT
A FIELD STRENGTH OF H = 200 OERSTEDS USING A MAGNETIC
INDICATOR PER ASTM A342.
4. THREADS. 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.
5. PART NUMBER. THE PART NUMBER CONSISTS OF THE BASIC MS SHEET NUMBER, FOLLOWED BY A DASH NUMBER TAKEN FROM TABLE II.
EXAMPLE: MS35691 - 1
DASH NUMBER
BASIC MS SHEET NUMBER
MS35691 - 1 INDICATES - NUT, PLAIN, HEXAGON (JAM) THREAD SIZE
.2500-20UNC-2B, STEEL, CARBON, GRADE B, CADMIUM PLATED.
1/ ADD "B" BEFORE DASH NUMBER FOR CORROSION RESISTANT STEEL NUTS WITH BLACK OXIDE COATING, CLASS 4, IN ACCORDANCE WITH MIL-DTL-13924.
EXAMPLE: MS35691 - B 3
.2500-20UNC-2B
BLACK OXIDE COATED CORROSION RESISTANT STEEL
BASIC MS SHEET NUMBER
2/ ADD "N" BEFORE DASH NUMBER FOR BRASS NUTS WITH NICKEL PLATING, IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
EXAMPLE: MS35691 - N 4
.2500-20UNC-2B
NICKEL PLATED BRASS BASIC MS SHEET NUMBER
4
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