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螺纹代号
Thread symbol
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螺纹Thread
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参考标准
Reference Standard
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牙型角
Thread Angle
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M
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公制螺纹
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粗牙系列Coarse series
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ISO68GB196
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60°
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Metric screw threads
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细牙系列Fine series
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ISO724GB196
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S
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小螺纹Miniature screw threads
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ISO1501GB/T15054
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UNC
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统一螺纹
Unified threads
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粗牙系列Coarse series
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ANSI B 1.1
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UNF
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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
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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
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ISO/R7GB7306
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55°
1/16 Taper
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Rc
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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
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ISO/R228GB7307
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NPT
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通用美标锥管螺纹
American Standards taper pipe threads for general use
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ANSI/ASEM B1.20.1GB/T12716
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60°
1/16 Taper
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NPSC
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美标直管接头螺纹
American Standards striaght pipe threads in pipe coupling
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ANSI/ASEM B1.20.1
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60°
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NPSM
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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
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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
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美标锥管气密螺纹
Dryseal American standards taper pipe threads
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60°
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BA
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英标联接螺纹
British association threads
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BS93
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47°30〃
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BSC
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英标自行车螺纹
British standards cycle threads
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BS811
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60°
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BSW
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英标惠氏螺纹
British standards Whitworth threads
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BS84
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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
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英标显微镜螺纹
British standards microscope objective threads
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BS3569
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FG
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（德国）自行车螺纹
(Germany)Cycle threads
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DIN79013
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60°
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Pg
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（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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Bluish.ice