MS27039F
7. Part number:
The part number shall consist of the basic MS number followed by the material and finish code followed by the dash number.
Example: MS27039DD0809 indicates - Screw, Machine - Pan Head Structural, Cross Recessed;
.164-32 UNC-3A, .594 length, Anodized Aluminum
Alloy Screw.
MS27039BP 0809 indicates - Screw, Machine - Pan Head Structural, Cross Recessed;
.164-32 UNC-3A, .594 length, Cadmium Plated
Manganese Screw.
MS27039B0809 indicates - Screw, Machine - Pan Head Structural, Cross Recessed;
.164-32 UNC-3A, .594 length, uncoated Manganese
Bronze Screw.
MS27039 - 0809 indicates - Screw, Machine - Pan Head Structural, Cross Recessed;
.164-32 UNC-3A, .594 length, Cadmium Plated Alloy
Steel Screw.
MS27039C0809 indicates - Screw, Machine - Pan Head Structural, Cross Recessed;
.164-32 UNC-3A, .594 length, Heat and Corrosion- Resistant Steel Screw.
8. Head marking:
a. Basic part no. and applicable dash no. (Basic part optional for .164-32 screw sizes).
b. Material as follows: Aluminum Alloy - none, Bronze - "B", Alloy Steel - "-", Heat and Corrosion- Resistant Steel -"C".
c. Manufacturer's trade-mark shall be added, location optional.
Table I. Dimensions
Thread |
A |
B |
C |
R Rad |
U |
Max Eccentricity |
|||||
Head to Shank Fim |
Recess to Shank Fim |
||||||||||
.164-32 UNC-3A .190-32 UNF-3A .250-28 UNF-3A .3125-24 UNF-3A .375-24 UNF-3A .4375-20 UNF-3A .500-20 UNF-3A |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
|||
.1640 .1890 .2490 .3115 .3740 .4365 .4990 |
.1610 .1860 .2460 .3085 .3710 .4325 .4950 |
.322 .373 .492 .615 .740 .868 .987 |
.306 .357 .473 .594 .716 .838 .958 |
.115 .133 .175 .218 .261 .304 .348 |
.105 .122 .162 .203 .244 .286 .327 |
.020 |
.010 |
.032 |
.020 .024 .030 |
.016 .020 .024 |
|
.047 |
.036 .042 .048 .056 |
.030 |
|||||||||
.025 |
.015 |
||||||||||
.030 |
.020 |
||||||||||
Table II. Mechanical Properties
Thread |
Ultimate Tensile Load Pounds-Min 1_I |
Ultimate Double Shear Load Pounds Min 2_I |
||||||
Alum Alloy |
Manganese Bronze |
Alloy Steel |
Cres |
Alum Alloy |
Manganese Bronze |
Alloy Steel |
Cres |
|
.164-32 UNC-3A .190-32 UNF-3A .250-28 UNF-3A .3125-24 UNF-3A .375-24 UNF-3A .4375-20 UNF-3A .500-20 UNF-3A |
868 1,240 2,260 3,600 5,440 7,360 9,900 |
1,190 1,700 3,090 4,930 7,460 10,100 13,600 |
1,750 2,500 4,550 7,250 11,000 14,800 20,000 |
1,750 2,500 4,550 7,250 11,000 14,800 20,000 |
1,570 2,110 3,650 5,700 8,220 11,200 14,700 |
2,150 2,890 5,010 7,820 11,300 15,300 20,000 |
3,170 4,250 7,360 11,500 16,600 22,500 29,400 |
3,170 4,250 7,360 11,500 16,600 22,500 29,400 |
1_I Based on 62,000 PSI for Alum Alloy, 85,000 PSI for Manganese Bronze, 125,000 PSI for Alloy Steel,
125,000 PSI for Corrosion-Resistant Steel. The stress areas used for the calculations of the tensile load values are listed on FED-STD-H28I2.
2_I Based on 60% of the minimum ultimate tensile strength at nominal shank diameter times two.
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