|
螺纹代号
Thread symbol |
螺纹Thread |
参考标准
Reference Standard |
牙型角
Thread Angle |
|
M |
公制螺纹 |
粗牙系列Coarse series |
ISO68GB196 |
60° |
|
Metric screw threads |
细牙系列Fine series |
ISO724GB196 |
|
S |
小螺纹Miniature screw threads |
ISO1501GB/T15054 |
|
UNC |
统一螺纹
Unified threads |
粗牙系列Coarse series |
ANSI B 1.1 |
|
UNF |
细牙系列Fine series |
|
UNEF |
特细牙系列
Extra-Fine series |
|
UNS |
特殊直径、螺距、衔接长度系列
Special diameter\pitch length of engagmentand |
|
UN |
等螺距系列
Constant-pitch series |
|
Tr |
公制梯形螺纹
Metric trapezoidalscrew threads |
ISO2904GB5796 |
30° |
|
TM |
30梯形螺纹
30trapezoidalscrew threads |
|
R |
螺纹密封的管螺纹
Pipe threads where pressure-tight joints are made on the threads |
锥管内螺纹
Taper external screw threads |
ISO/R7GB7306 |
55°
1/16 Taper |
|
Rc |
锥管外螺纹
Taper internal screw threads |
|
RP |
直管螺纹
Parallel internal pipe threads |
55° |
|
G |
非螺纹密封的管螺纹
Pipe threads where pressure-tight joints are not made on the threads |
ISO/R228GB7307 |
|
NPT |
通用美标锥管螺纹
American Standards taper pipe threads for general use |
ANSI/ASEM B1.20.1GB/T12716 |
60°
1/16 Taper |
|
NPSC |
美标直管接头螺纹
American Standards striaght pipe threads in pipe coupling |
ANSI/ASEM B1.20.1 |
60° |
|
NPSM |
美标直管机用自由配合接头联接螺纹
American Standards striaght pipe threads for free-fitting mechanical joints for fixtures |
|
|
NPTF |
美标燃料直管内螺纹
Dryseal American standards fuel internal straight pipe threads |
ANSI B1.20.3 |
60°
1/16 Taper |
|
NPSF |
美标锥管气密螺纹
Dryseal American standards taper pipe threads |
60° |
|
BA |
英标联接螺纹
British association threads |
BS93 |
47°30〃 |
|
BSC |
英标自行车螺纹
British standards cycle threads |
BS811 |
60° |
|
BSW |
英标惠氏螺纹
British standards Whitworth threads |
BS84 |
55° |
|
BSF |
英标细牙螺纹
British standards fine threads |
|
BSMO |
英标显微镜螺纹
British standards microscope objective threads |
BS3569 |
|
FG |
（德国）自行车螺纹
(Germany)Cycle threads |
DIN79013 |
60° |
|
Pg |
（德国）薄钢管螺纹
(Germany)Steel conduit threads |
DIN40430 |
80° |
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