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2024年1月18日发(作者:仓颉编程工具)
螺纹制式说明
NPT为60度牙型角锥管螺纹
用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下:
Rc—圆锥内螺纹
Rp—与圆锥外螺纹配合的圆柱内螺纹
R—圆锥外螺纹
G螺纹表示非螺纹密封的管螺纹
Z就是NPT螺纹
纹代号Thread Code
一、英制螺纹(螺纹牙型角55度)Thread of British standard ( Thread pitch shape
angle 55°)
BSW----英国标准惠氏螺纹(粗牙)British Standard Whitworth Thread
( Coarse )
BSF----英国标准惠氏螺纹(细牙)British Standard Whitworth Thread ( Fine )
G----直管螺纹(外螺纹分A、B两面级、丝锥分G、G-D)Straight pipe thread
( Outside )
thread in AB: taps in G、G-D )
R----锥管外螺纹(旧代号ZG;KG)Outside paper pipe thread ( Old thread code
ZG,KG )
RC----锥管内螺纹(旧代号ZG;KG)Inside taper pipe thread ( Old thread code
ZG,KG )
二、美制螺纹(螺纹牙型角60度)Thread of American standard ( Thread pitch shape
angle 60°
UNC----统一制粗牙螺纹(代替NC)Unified coarse pitch thread ( Instead of
NC )
UNF----统一制细牙螺纹(代替NF)Unified fine pitch thread ( Instead of NF )
UNEF----统一制超细牙螺纹Unified superfine pitch thread
UN-----统一制不变螺距螺纹Unified thread
UNS----统一制特殊螺纹Unified Special thread
NPT----一般用途锥管螺纹(旧代号Z;K)Taper pipe thread for general purpose
( Old
thread code Z,K )
NPSC----管接头直管内螺纹Internal straight pipe thread for connection
NPSM----设备上自由配合,机械连接用直管螺纹Straight pipe thread for
general purpose
NPTF----干密封锥管螺纹Dryseal taper pipe thread
NPSF----干密封燃油直管螺纹Dryseal straight pipe internal thread
NGT----气瓶用锥螺纹Special thread for gas cylinder
三、米制螺纹Metric thread
ZM-----米制锥管螺纹 Metric taper pipe thread
四、其它螺纹Other threads
SM----缝纫机螺纹Thread for sewing machine
PZ----气瓶用锥螺纹Special thread for gas cylinder
5V1-20V1-气门芯螺纹5V1-20V1-Tyre valve thread
螺纹代号说明示例:Explanation of thread code. e. g.
1/4-20UNC
1/4-公称直径1/4" nominal dia. 1/4"
20-每寸20牙twenty teeth per inch
UNC-美标统一制粗牙螺纹unified coarse pitch thread ( American standard
但还有GAZ是表示什么螺纹呢?
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