AIA/NAS M51975-2008 pdf download SCREW, SHOULDER, SOCKET HEAD, HEXAGON, 3 ALLOY STEEL OR NICKEL-COPPER ALLOY, UNC-3A
MATERIAL: ALLOY STEEL IN ACCORDANCE WITH NASM21 472 OR NICKEL-COPPER ALLOY (UNS N04400) PER QQ-N-281 , CLASS A IN ACCORDANCE WITH NASM21 472.
FINISH: ALLOY STEEL – CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-41 6. TYPE II, CLASS 2 OR ZINC PLATE PER ASTM B 633, TYPE II, CLASS FE/ZN 5.
NICKEL-COPPER ALLOY – NONE
THREADS: THREADS SHALL BE CLASS 3A IN ACCORDANCE WITH FED-STD-H28/2. ACCEPTABILITY OF SCREW THREADS SHALL BE IN ACCORDANCE WITH FED-STD-H28/20, SYSTEM 22.
EXAMPLE OF PART NUMBER: THE PART NUMBER SHALL CONSIST OF THE BASIC MS NUMBER, THE MATERIAL CODE, A DASH NUMBER TAKEN FROM TABLE 2 AND A FINISH CODE.
MS51 975 – 1 P
FINISH: NO SUFFIX FOR CADMIUM PLATE (ALLOY STEEL ONLY),
“P” SUFFIX FOR ZINC PLATE (ALLOY STEEL ONLY).
DASH NUMBER FROM TABLE 2.
MATERIAL: “-” FOR ALLOY STEEL, “M” FOR NICKEL-COPPER ALLOY
BASIC MS NUMBER.
MS51 975-1 SCREW, SHOULDER, SOCKET HEAD, HEXAGON, ALLOY STEEL, .250 NOMINAL
SHOULDER SIZE, .375 SHOULDER LENGTH, .1 900-24 UNC-3A THREAD SIZE, CADMIUM PLATED.
MS51 975-1 P SCREW, SHOULDER, SOCKET HEAD, HEXAGON, ALLOY STEEL, .250 NOMINAL
SHOULDER SIZE, .375 SHOULDER LENGTH, .1 900-24 UNC-3A THREAD SIZE, ZINC PLATED.
MS51 975M1 SCREW, SHOULDER, SOCKET HEAD, HEXAGON, NICKEL-COPPER ALLOY, .250 NOMINAL
SHOULDER SIZE, .375 SHOULDER LENGTH, .1 900-24 UNC-3A THREAD SIZE, NO FINISH.
IDENTIFICATION: SCREWS SHALL BE PERMANENTLY MARKED BY THE MANUFACTURER INDICATING SOURCE INDENTIFICATION. MARKING SIZE, TYPE AND LOCATION OF MARKS AT THE MANUFACTURERS OPTION. SCREWS SHALL NOT BE MARKED ON BEARING OR WRENCHING SURFACES.
NOTES:
1 . DIMENSIONS AND TOLERANCES IN ACCORDANCE WITH ANSI Y1 4.5M-1 982.
2. DIMENSIONS ARE IN INCHES.
3. THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.
4. SEE MS21 301 FOR UNPLATED ALLOY STEEL AND NASM51576 FOR CORROSION RESISTANT STEEL SCREWS.
5. DIMENSIONS APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED.
6. REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
7. THE EDGE OF SHOULDER MAY BE BROKEN. THE RADIUS OR CHAMFER MAY NOT EXCEED 0.005 INCH FOR SHOULDERS TO 0.375 INCH DIAMETER AND 0.008 INCH FOR LARGER DIAMETERS.

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