|
螺紋代號
Thread symbol |
螺紋Thread |
參考標準
Reference Standard |
牙型角
Thread Angle |
|
M |
公制螺紋 |
粗牙系列Coarse series |
ISO68GB196 |
60° |
|
Metric screw threads |
細牙系列Fine series |
ISO724GB196 |
|
S |
小螺紋Miniature screw threads |
ISO1501GB/T15054 |
|
UNC |
統一螺紋
Unified threads |
粗牙系列Coarse series |
ANSI B 1.1 |
|
UNF |
細牙系列Fine series |
|
UNEF |
特細牙系列
Extra-Fine series |
|
UNS |
特殊直徑、螺距、銜接長度系列
Special diameter\pitch length of engagmentand |
|
UN |
等螺距系列
Constant-pitch series |
|
Tr |
公制梯形螺紋
Metric trapezoidalscrew threads |
ISO2904GB5796 |
30° |
|
TM |
30梯形螺紋
30trapezoidalscrew threads |
|
R |
螺紋密封的管螺紋
Pipe threads where pressure-tight joints are made on the threads |
錐管內螺紋
Taper external screw threads |
ISO/R7GB7306 |
55°
1/16 Taper |
|
Rc |
錐管外螺紋
Taper internal screw threads |
|
RP |
直管螺紋
Parallel internal pipe threads |
55° |
|
G |
非螺紋密封的管螺紋
Pipe threads where pressure-tight joints are not made on the threads |
ISO/R228GB7307 |
|
NPT |
通用美標錐管螺紋
American Standards taper pipe threads for general use |
ANSI/ASEM B1.20.1GB/T12716 |
60°
1/16 Taper |
|
NPSC |
美標直管接頭螺紋
American Standards striaght pipe threads in pipe coupling |
ANSI/ASEM B1.20.1 |
60° |
|
NPSM |
美標直管機用自由配合接頭聯接螺紋
American Standards striaght pipe threads for free-fitting mechanical joints for fixtures |
|
|
NPTF |
美標燃料直管內螺紋
Dryseal American standards fuel internal straight pipe threads |
ANSI B1.20.3 |
60°
1/16 Taper |
|
NPSF |
美標錐管氣密螺紋
Dryseal American standards taper pipe threads |
60° |
|
BA |
英標聯接螺紋
British association threads |
BS93 |
47°30〃 |
|
BSC |
英標自行車螺紋
British standards cycle threads |
BS811 |
60° |
|
BSW |
英標惠氏螺紋
British standards Whitworth threads |
BS84 |
55° |
|
BSF |
英標細牙螺紋
British standards fine threads |
|
BSMO |
英標顯微鏡螺紋
British standards microscope objective threads |
BS3569 |
|
FG |
（德國）自行車螺紋
(Germany)Cycle threads |
DIN79013 |
60° |
|
Pg |
（德國）薄鋼管螺紋
(Germany)Steel conduit threads |
DIN40430 |
80° |
