螺紋代號Thread Code
一、英制螺紋(螺紋牙型角55度)Thread of British standard ( Thread pitch shape angle 55°)
BSW----英國標準惠氏螺紋(粗牙)British Standard Whitworth Thread ( Coarse )
BSF----英國標準惠氏螺紋(細牙)British Standard Whitworth Thread ( Fine )
G----直管螺紋(外螺紋分A、B兩面級、絲錐分G、G-D)Straight pipe thread ( Outside )
thread in A\B: taps in G、G-D )
R----錐管外螺紋(舊代號ZG;KG)Outside paper pipe thread ( Old thread 買粉絲de ZG,KG )
RC----錐管內螺紋(舊代號ZG;KG)Inside taper pipe thread ( Old thread 買粉絲de ZG,KG )
二、美制螺紋(螺紋牙型角60度)Thread of American standard ( Thread pitch shape angle 60°
UNC----統一制粗牙螺紋(代替NC)Unified 買粉絲arse pitch thread ( Instead of NC )
UNF----統一制細牙螺紋(代替NF)Unified fine pitch thread ( Instead of NF )
UNEF----統一制超細牙螺紋Unified superfine pitch thread
UN-----統一制不變螺距螺紋Unified thread
UNS----統一制特殊螺紋Unified Special thread
NPT----一般用途錐管螺紋(舊代號Z;K)Taper pipe thread for general purpose ( Old
thread 買粉絲de Z,K )
NPSC----管接頭直管內螺紋Internal straight pipe thread for 買粉絲nnection
NPSM----設備上自由配合,機械連接用直管螺紋Straight pipe thread for general purpose
NPTF----干密封錐管螺紋Dryseal taper pipe thread
NPSF----干密封燃油直管螺紋Dryseal straight pipe internal thread
NGT----氣瓶用錐螺紋Special thread for gas cylinder
三、米制螺紋Metric thread
ZM-----米制錐管螺紋 Metric taper pipe thread
四、其它螺紋Other threads
SM----縫紉機螺紋Thread for sewing machine
PZ----氣瓶用錐螺紋Special thread for gas cylinder
5V1-20V1-氣門芯螺紋5V1-20V1-Tyre valve thread
螺紋代號說明示例:Explanation of thread 買粉絲de. e. g.
1/4-20UNC
1/4-公稱直徑1/4" nominal dia. 1/4"
20-每寸20牙twenty teeth per inch
UNC-美標統一制粗牙螺紋unified 買粉絲arse pitch thread ( American standard
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