ASME B18.3 TABLE 2A De forme standard Dimensions pour Hexagon and spline flat countersunk head cap screws, inch series
Cette norme a été annulée
Vis à tête fraisée creuse. La tête fraisée doit avoir une surface supérieure plane et une surface d'appui conique avec un angle d'environ 82 degrés.
Dessins cotés et schémas techniques
Dimensions et paramètres techniques clés
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Dimensions in inches - ASME b18.3Table 2A - 2008- Socket Flat Countersunk Head Cap Screws |
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| d thread size | Nr. of threads x inch | d1 min | b basic thread length | dk max theo.Sharp | k max | t min | S nom | M nom | ||
| inches | mm | UNC | UNF | |||||||
| 0 (0.06) | 1.52 | - | 80 | 0.568 | 0.5 | 0.138 | 0.044 | 0.025 | 0.035 | 0.048 |
| 1 (0.073) | 1.85 | 64 | 72 | 0.07 | 0.62 | 0.168 | 0.054 | 0.031 | 0.05 | 0.06 |
| 2 (0.086) | 2.18 | 56 | 64 | 0.082 | 0.62 | 0.197 | 0.064 | 0.038 | 0.05 | 0.06 |
| 3 0.099) | 2.51 | 48 | 56 | 0.095 | 0.62 | 0.226 | 0.073 | 0.044 | 0.062 | 0.072 |
| 4 (0.112) | 2.84 | 40 | 48 | 0.108 | 0.75 | 0.255 | 0.083 | 0.055 | 0.062 | 0.072 |
| 5 (0.125) | 3.18 | 40 | 44 | 0.12 | 0.75 | 0.281 | 0.90 | 0.061 | 0.078 | 0.096 |
| 6 (0.138) | 3.51 | 32 | 40 | 0.133 | 0.75 | 0.307 | 0.097 | 0.066 | 0.078 | 0.096 |
| 8 (0.164) | 4.17 | 32 | 36 | 0.159 | 0.875 | 0.359 | 0.112 | 0.076 | 0.094 | 0.111 |
| 10 (0.19) | 4.83 | 24 | 32 | 0.184 | 0.875 | 0.411 | 0.127 | 0.087 | 0.125 | 0.145 |
| 1/4 | 6.35 | 20 | 28 | 0.244 | 1 | 0.531 | 0.161 | 0.111 | 0.156 | 0.183 |
| 5/16 | 7.94 | 18 | 24 | 0.305 | 1.125 | 0.656 | 0.198 | 0.135 | 0.188 | 0.216 |
| 3/8 | 9.53 | 16 | 24 | 0.368 | 1.25 | 0.781 | 0.234 | 0.159 | 0.219 | 0.251 |
| 7/16 | 11.11 | 14 | 20 | 0.429 | 1.375 | 0.844 | 0.234 | 0.159 | 0.25 | 0.291 |
| 1/2 | 12.70 | 13 | 20 | 0.492 | 1.5 | 0.938 | 0.251 | 0.172 | 0.312 | 0.372 |
| 5/8 | 15.88 | 11 | 18 | 0.616 | 1.75 | 1.188 | 0.324 | 0.220 | 0.375 | 0.454 |
| 3/4 | 19.05 | 10 | 16 | 0.741 | 2 | 1.438 | 0.396 | 0.220 | 0.5 | 0.454 |
| 7/8 | 22.23 | 9 | 14 | 0.865 | 2.25 | 1.688 | 0.468 | 0.248 | 0.562 | - |
| 1 | 25.40 | 8 | 12 | 0.989 | 2.5 | 1.938 | 0.540 | 0.297 | 0.625 | - |
| 1-1/8 | 28.58 | 7 | 12 | 1.108 | 2.81 | 2.188 | 0.611 | 0.325 | 0.75 | - |
| 1-1/4 | 31.75 | 7 | 12 | 1.233 | 3.12 | 2.438 | 0.683 | 0.358 | 0.875 | - |
| 1-3/8 | 34.93 | 6 | 12 | 1.357 | 3.44 | 2.688 | 0.755 | 0.402 | 0.875 | - |
| 1-1/2 | 38.10 | 6 | 12 | 1.482 | 3.75 | 2.938 | 0.827 | 0.435 | 1 | - |