UNC和UNF统一英制螺纹
ANSI/ASME B1.1统一国家螺纹- UNC粗系列和UNF细系列。
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- UNC -统一国家粗螺纹-与ISO米制螺纹相当
- UNF -统一国家细螺纹
- 女性和男性UNC/UNF线程都是平行的
- 联合国军司令部/联合国军部队侧翼角为60°
统一线程有三种不同的类型:
- 适用于需要自由公差的应用程序，即使有轻微的螺纹缺口，也可以轻松组装
- 最常用的类用于一般应用程序
- 适用于螺纹元件的紧密配合和/或精度很重要的应用场合
UNC -统一粗螺纹
根据ANSI B1.1的UNC螺纹:
| 大直径 (在) |
每英寸螺纹数 (tpi) |
大直径 | 丝锥尺寸 (毫米) |
球场 (毫米) |
|
|---|---|---|---|---|---|
| (在) | (毫米) | ||||
| #1 - 64 | 64 | 0.073 | 1.854 | 1.50 | 0.397 |
| #2 - 56 | 56 | 0.086 | 2.184 | 1.80 | 0.453 |
| #3 - 48 | 48 | 0.099 | 2.515 | 2.10 | 0.529 |
| #4 - 40 | 40 | 0.112 | 2.845 | 2.35 | 0.635 |
| #5 - 40 | 40 | 0.125 | 3.175 | 2.65 | 0.635 |
| #6 - 32 | 32 | 0.138 | 3.505 | 2.85 | 0.794 |
| #8 - 32 | 32 | 0.164 | 4.166 | 3.50 | 0.794 |
| #10 - 24 | 24 | 0.190 | 4.826 | 4.00 | 1.058 |
| #12 - 24 | 24 | 0.216 | 5.486 | 4.65 | 1.058 |
| 1/4" - 20 | 20. | 0.250 | 6.350 | 5.35 | 1.270 |
| 5/16" - 18 | 18 | 0.313 | 7.938 | 6.80 | 1.411 |
| 3/8" - 16 | 16 | 0.375 | 9.525 | 8.25 | 1.587 |
| 7/16" - 14 | 14 | 0.438 | 11.112 | 9.65 | 1.814 |
| 1/2" - 13 | 13 | 0.500 | 12.700 | 11.15 | 1.954 |
| 9/16" - 12 | 12 | 0.563 | 14.288 | 12.60 | 2.117 |
| 5/8" - 11 | 11 | 0.625 | 15.875 | 14.05 | 2.309 |
| 3/4" - 10 | 10 | 0.750 | 19.050 | 17.00 | 2.540 |
| 7/8" - 9 | 9 | 0.875 | 22.225 | 20.00 | 2.822 |
| 1英寸- 8英寸 | 8 | 1.000 | 25.400 | 22.85 | 3.175 |
| 1又1/8" - 7 | 7 | 1.125 | 28.575 | 25.65 | 3.628 |
| 1 1/4" - 7 | 7 | 1.250 | 31.750 | 28.85 | 3.628 |
| 1 3/8" - 6 | 6 | 1.375 | 34.925 | 31.55 | 4.233 |
| 1 1/2" - 6 | 6 | 1.500 | 38.100 | 34.70 | 4.233 |
| 1 3/4" - 5 | 5 | 1.750 | 44.450 | 40.40 | 5.080 |
| 2“- 4 1/2 | 4 1/2 | 2.000 | 50.800 | 46.30 | 5.644 |
| 2 1/4“- 4 1/2 | 4 1/2 | 2.250 | 57.150 | 52.65 | 5.644 |
| 2 1/2" - 4 | 4 | 2.500 | 63.500 | 58.50 | 6.350 |
| 2 3/4" - 4 | 4 | 2.750 | 69.850 | 64.75 | 6.350 |
| 3英寸- 4英寸 | 4 | 3.000 | 76.200 | 71.10 | 6.350 |
| 3 1/4" - 4 | 4 | 3.250 | 82.550 | 77.45 | 6.350 |
| 3 1/2" - 4 | 4 | 3.500 | 88.900 | 83.80 | 6.350 |
| 3又3/4" - 4 | 4 | 3.750 | 95.250 | 90.15 | 6.350 |
| 4英寸- 4英寸 | 4 | 4.000 | 101.600 | 96.50 | 6.350 |
示例- UNC线程的典型名称
- 1/4 " x 20 UNC
UNF -统一国家细线
UNF线程ANSI B1.1:
| 大直径 (在) |
每英寸螺纹数 (tpi) |
大直径 | 丝锥尺寸 (毫米) |
球场 (毫米) |
|
|---|---|---|---|---|---|
| (在) | (毫米) | ||||
| #0 - 80 | 80 | 0.060 | 1.524 | 1．25 | 0.317 |
| #1 - 72 | 72 | 0.073 | 1.854 | 1.55 | 0.353 |
| #2 - 64 | 64 | 0.086 | 2.184 | 1.90 | 0.397 |
| #3 - 56 | 56 | 0.099 | 2.515 | 2.15 | 0.453 |
| #4 - 48 | 48 | 0.112 | 2.845 | 2.40 | 0.529 |
| #5 - 44 | 44 | 0.125 | 3.175 | 2.70 | 0.577 |
| #6 - 40 | 40 | 0.138 | 3.505 | 2.95 | 0.635 |
| #8 - 36 | 36 | 0.164 | 4.166 | 3.50 | 0.705 |
| #10 - 32 | 32 | 0.190 | 4.826 | 4.10 | 0.794 |
| #12 - 28 | 28 | 0.216 | 5.486 | 4.70 | 0.907 |
| 1/4" - 28 | 28 | 0.250 | 6.350 | 5.50 | 0.907 |
| 5/16" - 24 | 24 | 0.313 | 7.938 | 6.90 | 1.058 |
| 3/8" - 24 | 24 | 0.375 | 9.525 | 8.50 | 1.058 |
| 7/16" - 20 | 20. | 0.438 | 11.112 | 9.90 | 1.270 |
| 1/2" - 20 | 20. | 0.500 | 12.700 | 11.50 | 1.270 |
| 9/16" - 18 | 18 | 0.563 | 14.288 | 12.90 | 1.411 |
| 5/8" - 18 | 18 | 0.625 | 15.875 | 14.50 | 1.411 |
| 3/4" - 16 | 16 | 0.750 | 19.050 | 17.50 | 1.587 |
| 7/8" - 14 | 14 | 0.875 | 22.225 | 20.40 | 1.814 |
| 1英寸- 12英寸 | 12 | 1.000 | 25.400 | 23.25 | 2.117 |
| 1又1/8" - 12 | 12 | 1.125 | 28.575 | 26.50 | 2.117 |
| 1 1/4" - 12 | 12 | 1.250 | 31.750 | 29.50 | 2.117 |
| 1 3/8" - 12 | 12 | 1.375 | 34.925 | 32.75 | 2.117 |
| 1 1/2" - 12 | 12 | 1.500 | 38.100 | 36.00 | 2.117 |
示例- UNF线程的典型名称
- 1/2 " x 20 UNF
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