B为螺母,A为螺栓,2为精度,分1-3级,9/16标准螺距为每英寸18牙,钻孔子直径按9/16计算。
d 螺 距
TPI
符号表示 L X Y
右刀 左刀
外螺纹刀片 3/8" 27 16ER27 NPT 16EL27 NPT 16.5 0.8 0.7
18 16ER18 NPT 16EL18 NPT 0.8 0.7
14 16ER14 NPT 16EL14 NPT 1.5 1.1
11.5 16ER11.5 NPT 16EL11.5 NPT 1.5 1.1
8 16ER8 NPT 16EL8 NPT 1.5 1.1
内螺纹刀片 3/8" 27 16NR27 NPT 16NL27 NPT
16.5
0.8 0.7
18 16NR18 NPT 16NL18 NPT 0.8 0.7
14 16NR14 NPT 16NL14 NPT 1.5 1.1
11.5 16NR11.5 NPT 16NL11.5 NPT 1.5 1.1
8 16NR8 NPT 16NL8 NPT 1.5 1.1
2b=250!