螺纹代号
Thread
symbol |
|
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° |