
thread size is oversized.
| Brass | Brass castings | Aluminum alloy castings | Magnesium alloy die castings | Zinc alloy castings | |
| 10黄銅 | 黄銅鋳物10 | アルミ合金鋳物10 | マグネシウム合金鋳物10 | 亜鉛合金鋳物10 | |
| (m/min) | (m/min) | ( m/ min) | (m/min) | (m/min) |
TYPE:1
Segment:1C
| Size | Code | Chamfer | L (mm) | ℓ (mm) | ℓn (mm) | ℓs (mm) | Ds (mm) | K (mm) | ℓk (mm) | No. of flutes | TYPE | MSRP |
| For T | ripod Th | reads | ||||||||||
| 1/4-20 | SYU04N0KEB | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 1 | ¥ 1,680 ※ |
shown in the picture on the right.
threads, while their thread shapes are the same.
■Comparison between tripod thread and unified thread unit: mm
| Pitch | Minor Diameter | Pitch Diameter | Minor Diameter | |
| Size |
| (P) | (D) | (D ) | (D ) | ||
| 2 | 1 | ||||
| Basic size | 6.350 | 5.525 | 4.975 | ||
| Tripod thread | ~ | ||||
| 1.270 | Maximum allowable size | 5.820 | 5.267 | ||
| 1/4-20 | |||||
| Minimum allowable size | 6.460 | 5.635 | 4.975 | ||
| Basic size | 6.350 | 5.524 | 4.976 | ||
| Unified thread 2B | |||||
| 1.270 | Maximum allowable size | ~ | 5.648 | 5.257 | |
| 1/4-20UNC | |||||
| Minimum allowable size | ~ | 5.525 | 4.979 |
■ for Tripod Threads ■ Bored hole size unit: mm unit: mm
| Size Minor diameter of int Max. | ernal thread (D1)Bored hole size (reference) Min. |
| 1/4 - 20 5.267 | 4.975 5.19 |
| Size | Class | Upper | Lower | |||||
| Size | Size | ( μ m) | ( μ m) | Size | ||||
| 1/4 | - 20 | - | 6.350 | 5.525 | 230 | 210 | 4.975 |