Basics of thread
螺紋的種類十分多樣。您可閱讀本篇螺紋基本介紹，或是查看我們的 螺紋常見問題。
公母接頭
不論是內螺紋或是外螺紋，每一組配對的螺紋接頭，均分別稱為公頭及母頭。例如，螺栓稱為公頭而對應的孔洞稱為母頭。
慣用手
螺紋的螺旋線有兩種可能方向。多數的螺紋的安排是，若從螺旋的中心軸看過去，當以順時針轉動時物體是脫離觀察者的，以逆時針轉動時物體則是靠近觀察者的。
在一般的常規上，預設的螺紋方向是給慣用右手的人，因此大部分的螺紋零件及固定件都是右旋螺紋。
設計
螺紋的類型可由下列特性區分。有平行螺紋及錐形螺紋的設計(見右側圖片)
螺距/TPI
螺距是螺紋相鄰的峰與峰之距離，以mm表示。
TPI (每英寸螺紋數) 常用於英制螺紋。
直徑
大徑是螺紋頂點間所量之螺紋最大直徑。
小徑是螺紋底部間所量之螺紋最小直徑。
節圓直徑是螺紋兩對側之間的距離，或是螺栓剖面之中線距離。
螺紋角
『螺紋側面角』是指螺紋側面與螺栓軸線垂直面的夾角。錐形螺紋則有『錐角』，此角度是指螺紋中軸與錐形斜度之夾角。
螺峰/螺谷
螺紋最突出之頂部稱為『螺峰』，螺紋最凹處之低點稱為『螺谷』。
螺紋尺寸種類
M - ISO 螺紋 (公制)
查看表格
M 粗螺紋 ISO 724 (DIN 13-1)
M 細螺紋 ISO 724 (DIN 13-2 to 11)
NPT - 管螺紋
查看表格
NPT ANSI B1.20.1
NPTF ANSI B1.20.3
G/R/RP - 惠氏螺紋 (BSPP/BSPT)
查看表格
G = BSPP ISO 228 (DIN 259)
R/Rp/Rc = BSPT ISO 7 (DIN 2999 replaced by EN10226)
UNC/UNF - 國家統一螺紋
查看表格
UNC ANSI B1.1
UNF ASNI B1.1
其他螺紋之圖面
轉換係數
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Basics of thread
- Gender
- Handedness
- Design
- Pitch / TPI
- Diameter
- Angle
- Crest / root
Most common threads
- M - ISO thread (metric)
- NPT - Pipe thread
- G/R/Rp - Whitworth thread (BSPP/BSPT)
- UNC/UNF - Unified National thread
- Extra: Comparison sheet (M - BSPP - BSPT - NPT - UNC - UNF)
Thread Seal Types
- Conversion factor
- Other threads
Frequently asked questions
- How to identify thread types?
- What does NPTF stand for: Female, fine or fuel?
- Which female threads are tapered/conical?
- What is the difference between G-thread (BSPP) and R-thread (BSPT)?
- Can I use an o-ring sealing with NPT thread?
- Are NPT and BSP Pipe threads compatible?
- What is screw/nut galling and how can it be avoided?
- What kind of sealing method is recommended when mounting a PA/PVDF fitting with male tapered thread into a metal counterpart?
- What kind of thread does a JIC-fitting have?
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