常用美制統一細牙螺紋尺寸表(UNF)
時間：2020-12-29 09:18:59 點擊次數：
UNF螺紋 牙型角為60° P=25.41/n H=0.866025/n*25.4 ，螺紋表示為如5/8－18 UNF，是指 UNF的螺紋，規格為5/8寸，一寸長的螺紋上有18個牙型角
公稱直徑 | No. | 牙數 | 螺距 | 牙高 | 大徑 | 中徑 | 小徑 |
No.0-80 UNF | No.1-72 UNF | 80 | 0.3175 | 0.172 | 1.524 | 1.318 | 1.181 |
No.2-64 UNF |
| 72 | 0.3528 | 0.191 | 1.854 | 1.626 | 1.473 |
|
| 64 | 0.3969 | 0.215 | 2.184 | 1.928 | 1.755 |
No.4-48 UNF | No.3-56 UNF | 56 | 0.4536 | 0.246 | 2.515 | 2.22 | 2.024 |
No.5-44 UNF |
| 48 | 0.5292 | 0.286 | 2.845 | 2.502 | 2.271 |
|
| 44 | 0.5773 | 0.312 | 3.175 | 2.709 | 2.551 |
No.6-40 UNF |
| 40 | 0.635 | 0.344 | 3.505 | 3.094 | 2.817 |
No.8-36 UNF |
| 36 | 0.7056 | 0.382 | 4.166 | 3.708 | 3.401 |
No.10-32 UNF |
| 32 | 0.7938 | 0.43 | 4.826 | 4.31 | 3.967 |
1/4－28 UNF | No.12-28 UNF | 28 | 0.9071 | 0.491 | 5.486 | 4.897 | 4.503 |
5/16－24 UNF |
| 28 | 0.9071 | 0.491 | 6.35 | 5.761 | 5.367 |
|
| 24 | 1.0583 | 0.573 | 7.938 | 7.249 | 6.792 |
3/8－24 UNF |
| 24 | 1.0583 | 0.573 | 9.525 | 8.837 | 8.379 |
7/16－20 UNF |
| 20 | 1.27 | 0.687 | 11.112 | 10.287 | 9.738 |
1/2－20 UNF |
| 20 | 1.27 | 0.687 | 12.7 | 11.874 | 11.326 |
9/16－18 UNF |
| 18 | 1.4111 | 0.764 | 14.288 | 13.371 | 12.761 |
5/8－18 UNF |
| 18 | 1.4111 | 0.764 | 15.875 | 14.958 | 14.348 |
3/4－16 UNF |
| 16 | 1.5875 | 0.859 | 19.05 | 18.019 | 17.33 |
7/8－14 UNF |
| 14 | 1.8143 | 0.982 | 22.225 | 21.046 | 20.262 |
1－12 UNF |
| 12 | 2.1167 | 1.146 | 25.4 | 24.026 | 23.109 |
1-1/8－12 UNF |
| 12 | 2.1167 | 1.146 | 28.575 | 27.201 | 26.284 |
1-1/4－12 UNF |
| 12 | 2.1167 | 1.146 | 31.75 | 30.376 | 29.459 |
1-3/8－12 UNF |
| 12 | 2.1167 | 1.146 | 34.925 | 33.551 | 32.634 |
1-1/2－12 UNF |
| 12 | 2.1167 | 1.146 | 38.1 | 36.726 | 35.809 |
