常用壓力計螺紋規(guī)格(壓力表螺牙規(guī)格) |
螺紋種類 | 記號 | 規(guī)格 | 螺山角度 | 直牙
(平行螺紋) | 公制普通螺紋 | M | JIS B 0251 | 60° | 公制細螺紋 | JIS B 0252 | 管用平行螺紋 | G | JIS B 0202 | 55° | 管用平行螺紋 | PF | JIS B 0254 | 管用平行母螺紋 | PS | JIS B 0253 | 斜牙
(斜行螺紋) | 管用錐形螺紋 | R | JIS B 0203 | 55° | 管用錐形螺紋 | PT | JIS B 0253 | 美制管用錐形螺紋 | NPT | ANSI B2.1 | 60° |
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Note: PT = BSPT ; PF = BSP |
| 1/8" (1分) | 1/4" (2分) | 3/8" (3分) | 1/2" (4分) | 3/4" (6分) | 1" (8分) | 1-1/4" | 1-1/2" | 2" | 外徑 (mm) | NPT | 9.489 | 12.487 | 15.926 | 19.772 | 25.117 | 31.461 | 40.218 | 46.287 | 58.325 | PT | 9.728 | 13.157 | 16.662 | 20.955 | 26.441 | 33.249 | 41.910 | 47.803 | 59.614 | PF / PS | 9.728 | 13.157 | 16.662 | 20.955 | 26.441 | 33.249 | 41.910 | 47.803 | 59.614 |
| 牙數(shù) (依長度1") | NPT | 27 | 18 | 18 | 14 | 14 | 11-1/2 | 11-1/2 | 11-1/2 | 11-1/2 | PT | 28 | 19 | 19 | 14 | 14 | 11 | 11 | 11 | 11 | PF / PS | 28 | 19 | 19 | 14 | 14 | 11 | 11 | 11 | 11 |
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