ASME B18.3 TABLE 1A Standard Dimensioni per Socket head cap screws, inch series
Viti a testa cilindrica con esagono incassato o con inserto scanalato. La testa cilindrica deve avere una superficie piatta smussata con lati cilindrici lisci o zigrinati e una superficie di appoggio piatta.
Disegni dimensionali e diagrammi tecnici
Dimensioni chiave e parametri tecnici
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Dimensions in inches - source ASME B18.3 table 1A Publication date: 2003 |
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| d basic thread size | Nr of threads x inch | dk max | k max | t min | b min | S nom |
M nom | |||
| inches | mm | UNC | UNF | |||||||
| 0 | 1.52 | - | 80 | 0.096 | 0.060 | 0.025 | 0.5 | 0.05 | 0.06 | |
| N° 1 | 1.85 | 64 | 72 | 0.118 | 0.073 | 0.031 | 0.62 | 0.062 | 0.072 | |
| N° 2 | 2.18 | 56 | 64 | 0.140 | 0.086 | 0.038 | 0.62 | 0.078 | 0.096 | |
| N° 3 | 2.51 | 48 | 56 | 0.161 | 0.099 | 0.044 | 0.62 | 0.078 | 0.096 | |
| N° 4 | 2.84 | 40 | 48 | 0.183 | 0.112 | 0.051 | 0.75 | 0.094 | 0.111 | |
| N° 5 | 3.18 | 40 | 44 | 0.205 | 0.125 | 0.057 | 0.75 | 0.094 | 0.111 | |
| N° 6 | 3.51 | 32 | 40 | 0.226 | 0.138 | 0.064 | 0.75 | 0.109 | 0.133 | |
| N° 8 | 4.17 | 32 | 36 | 0.270 | 0.164 | 0.077 | 0.88 | 0.141 | 0.168 | |
| N° 10 | 4.83 | 24 | 32 | 0.312 | 0.190 | 0.090 | 0.88 | 0.156 | 0.183 | |
| 1/4 | 6.35 | 20 | 28 | 0.375 | 0.250 | 0.120 | 1 | 0.188 | 0.216 | |
| 5/16 | 7.94 | 18 | 24 | 0.469 | 0.312 | 0.151 | 1.12 | 0.25 | 0.291 | |
| 3/8 | 9.53 | 16 | 24 | 0.562 | 0.375 | 0.182 | 1.25 | 0.312 | 0.372 | |
| 7/16 | 11.11 | 14 | 20 | 0.656 | 0.438 | 0.213 | 1.38 | 0.375 | 0.454 | |
| 1/2 | 12.70 | 13 | 20 | 0.750 | 0.5 | 0.245 | 1.5 | 0.375 | 0.454 | |
| 5/8 | 15.88 | 11 | 18 | 0.938 | 0.625 | 0.307 | 1.75 | 0.5 | 0.595 | |
| 3/4 | 19.05 | 10 | 16 | 1.125 | 0.750 | 0.370 | 2 | 0.625 | 0.620 | |
| 7/8 | 22.23 | 9 | 14 | 1.312 | 0.875 | 0.432 | 2.25 | 0.75 | 0.698 | |
| 1 | 25.40 | 8 | 12 | 1.5 | 1 | 0.495 | 2.5 | 0.75 | 0.790 | |
| 1 1/8 | 28.58 | 7 | 12 | 1.687 | 1.125 | 0.557 | 2.81 | 0.875 | - | |
| 1 1/4 | 31.75 | 7 | 12 | 1.875 | 1.250 | 0.620 | 3.12 | 0.875 | - | |
| 1 3/8 | 34.93 | 6 | 12 | 2.062 | 1.375 | 0.682 | 3.44 | 1 | - | |
| 1 1/2 | 38.10 | 6 | 12 | 2.25 | 1.5 | 0.745 | 3.75 | 1 | - | |
| 1 3/4 | 28.58 | 5 | - | 2.625 | 1.75 | 0.870 | 4.38 | 1.25 | - | |
| 2 | 34.93 | 4.5 | - | 3 | 2 | 0.995 | 5 | 1.5 | - | |
| 2-1/4 | 38.10 | 4.5 | - | 3.375 | 2.25 | 1.20 | 5.62 | 1.75 | - | |
| 2-1/2 | 63.50 | 4 | - | 3.75 | 2.5 | 1.245 | 6.25 | 1.75 | - | |
| 2-3/4 | 69.85 | 4 | - | 4.125 | 2.75 | 1.370 | 6.88 | 2 | - | |
| 3 | 76.20 | 4 | - | 4.5 | 3 | 1.495 | 7.5 | 2.25 | - | |
| 3-1/4 | 82.55 | 4 | - | 4.875 | 3.25 | 1.620 | 8.12 | 2.25 | - | |
| 3-1/2 | 88.90 | 4 | - | 5.25 | 3.5 | 1.745 | 8.75 | 2.75 | - | |
| 3-3/4 | 95.25 | 4 | - | 5.625 | 3.75 | 1.870 | 9.38 | 2.75 | - | |
| 4 | 101.6 | 4 | - | 6 | 4 | 1.995 | 10 | 3 | - | |
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Approx. mass, in kg x1000 pcs, (ρ=7,85 kg/dm3) - |
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| d thread size | 4-40 | 6-32 | 8-32 | 10-24 | 10-32 | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 5/8 | 3/4 |
| nominal length l | ||||||||||||
| 1/4 | 0,53 | 0,93 | 1,49 | 2,19 | 2,25 | |||||||
| 5/16 | 0,58 | 1,01 | 1,61 | 2,36 | 2,43 | 4,37 | ||||||
| 3/8 | 0,64 | 1,10 | 1,74 | 2,51 | 2,60 | 4,65 | 8,41 | |||||
| 7/16 | 0,70 | 1,19 | 1,87 | 2,68 | 2,78 | 4,95 | 8,88 | |||||
| 1/2 | 0,75 | 1,27 | 2,00 | 2,84 | 2,97 | 5,24 | 9,35 | 15,07 | ||||
| 5/8 | 0,87 | 1,45 | 2,26 | 3,18 | 3,32 | 5,81 | 10,29 | 16,43 | 24,45 | 36,13 | ||
| 3/4 | 0,99 | 1,61 | 2,50 | 3,50 | 3,67 | 6,39 | 11,23 | 17,82 | 26,33 | 38,61 | 69,10 | |
| 7/8 | 1,10 | 1,78 | 2,76 | 3,83 | 4,03 | 6,97 | 12,18 | 19,18 | 28,21 | 41,11 | 73,06 | |
| 1 | 1,29 | 2,07 | 3,02 | 4,16 | 4,39 | 7,54 | 13,10 | 20,56 | 30,09 | 43,61 | 77,02 | |
| 1-1/4 | 1,51 | 2,53 | 3,74 | 5,15 | 5,36 | 8,70 | 14,97 | 23,31 | 33,86 | 48,60 | 84,91 | 135,22 |
| 1-1/2 | 1,89 | 2,87 | 4,26 | 5,81 | 6,07 | 10,60 | 16,83 | 26,03 | 37,62 | 53,59 | 92,85 | 146,84 |
| 1-3/4 | 2,12 | 3,45 | 5,05 | 6,91 | 7,11 | 11,75 | 20,02 | 30,23 | 41,40 | 58,58 | 100,77 | 158,46 |
| 2 | 2,49 | 3,79 | 5,56 | 7,56 | 7,82 | 13,65 | 21,89 | 32,98 | 47,52 | 63,55 | 108,69 | 170,07 |
| 2-1/4 | 2,72 | 4,38 | 6,36 | 8,66 | 8,86 | 14,81 | 24,75 | 36,92 | 51,28 | 69,59 | 116,61 | 181,68 |
| 2-1/2 | 3,10 | 4,71 | 6,87 | 9,32 | 9,57 | 16,71 | 26,73 | 39,90 | 56,95 | 74,56 | 129,75 | 193,33 |
| 2-3/4 | 3,33 | 5,30 | 7,66 | 10,41 | 10,62 | 17,87 | 29,60 | 44,08 | 60,71 | 79,56 | 137,67 | 204,91 |
| 3 | 3,70 | 5,63 | 8,17 | 11,08 | 11,33 | 19,77 | 31,48 | 46,82 | 66,37 | 85,55 | 145,59 | 225,84 |
| 3-1/4 | 20,89 | 34,38 | 51,01 | 70,15 | 90,55 | 158,75 | 237,48 | |||||
| 3-1/2 | 22,83 | 36,25 | 53,75 | 75,83 | 95,53 | 166,67 | 249,06 | |||||
| 3-3/4 | 23,98 | 39,17 | 57,93 | 79,59 | 101,53 | 174,59 | 260,67 | |||||
| 4 | 25,88 | 41,04 | 60,68 | 85,23 | 106,51 | 187,76 | 281,60 | |||||
| 4-1/4 | 27,03 | 43,95 | 64,84 | 88,99 | 111,51 | 165,98 | 293,21 | |||||
| 4-1/2 | 28,94 | 45,83 | 67,61 | 94,68 | 117,50 | 203,60 | 304,82 | |||||
| 4-3/4 | 30,09 | 48,75 | 71,78 | 93,49 | 122,50 | 216,79 | 316,45 | |||||
| 5 | 31,99 | 50,62 | 74,54 | 104,10 | 127,50 | 224,71 | 337,36 | |||||
| 5-1/4 | 33,15 | 53,55 | 78,70 | 107,90 | 133,48 | 232,63 | 348,98 | |||||
| 5-1/2 | 35,05 | 55,44 | 81,47 | 113,54 | 138,49 | 245,80 | 360,60 | |||||
| 5-3/4 | 36,21 | 58,34 | 85,63 | 117,30 | 143,47 | 253,71 | 372,21 | |||||
| 6 | 38,21 | 60,21 | 88,37 | 122,97 | 149,48 | 261,63 | 393,13 | |||||
| 6-1/4 | 39,27 | 63,12 | 92,56 | 126,71 | 154,46 | 274,80 | 404,77 | |||||
| 6-1/2 | 41,18 | 66,03 | 95,30 | 132,40 | 159,45 | 282,72 | 416,36 | |||||
| 6-3/4 | 42,32 | 67,92 | 99,49 | 136,16 | 165,43 | 290,64 | 447,78 | |||||
| 7 | 44,22 | 69,79 | 102,22 | 141,85 | 170,42 | 303,80 | 448,92 | |||||