螺纹的几种制式
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 A\B: 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?