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