目前計量所擁有的三針可檢測下列所示螺紋塞規(guī)
三針尺寸 |
JIS普通螺紋螺距 |
美標(biāo)螺紋規(guī) 牙數(shù)/Inch |
0.22 |
0.4 |
64 |
0.29 |
0.5 |
48 |
0.39 |
0.7 |
36 |
0.455 |
0.75、0.8 |
32 |
0.53 |
0.9 |
28 |
0.62 |
1.0 |
24 |
0.725 |
1.25 |
20 |
0.895 |
1.5 |
18、16 |
1.1 |
1.75、2.0 |
14、13、12 |
螺紋塞規(guī)有效徑計算公式 :
E=M-3dm+0.866025P
各種規(guī)格螺紋塞規(guī)的測量下限尺寸(不含針徑磨耗)
螺距(P)(dm) |
測量尺寸(M) |
有效徑下限值(E) |
測量值下限 |
0.5 (0.29) |
M=E+0.437 |
***.675 |
###.112 |
0.7 (0.39) |
M=E+0.5638 |
***.545 |
###.109 |
0.75(0.455) |
M=E+0.7155 |
***.513 |
###.228 |
0.8 (0.455) |
M=E+0.6722 |
***.480 |
###.152 |
1.0 (0.62) |
M=E+0.994 |
***.350 |
###.344 |
1.25(0.725) |
M=E+1.0925 |
***.188 |
###.2805 |
1.5 (0.895) |
M=E+1.386 |
***.026 |
###.412 |
1.75(1.1) |
M=E+1.784 |
|
###.649 |
2.0 (1.1) |
M=E+1.568 |
***.701 |
###.269 |
0.4 (0.22) |
M=E+0.3136 |
***.740 |
###.053 |
注:***代表“螺紋大徑-1”;###代表“螺紋大徑”
常用小徑英寸螺紋規(guī)的檢查標(biāo)準(zhǔn):
規(guī)格 |
有效徑(E) |
測量值(M =E+X ) |
檢查方式 |
|
N O1-64UNC-2B |
1.598 |
+0.008 |
/ |
目視 |
+0.000 |
||||
N O2-56UNC-2B |
1.890 |
+0.008 |
/ |
目視 |
+0.000 |
||||
N O4-40UNC-2B |
2.433 |
+0.009 |
3.053 ~3.062 |
三針 Dm 為 0.39 |
+0.001 |
||||
N O6-32UNC-2B |
2.990 |
+0.012 |
3.668 --3.680 |
三針 |
+0.000 |
||||
N O8-32UNC-2B |
3.650 |
+0.012 |
4.328 --4.340 |
三針 |
+0.000 |
||||
N O10-24UNC-2B |
4.138 |
+0.012 |
5. 082 --5.094 |
三針 |
+0.000 |
||||
N O10-32UN F -2B |
4.310 |
+0.013 |
4.988 --5.001 |
三針 |
+0.000 |
圓柱管螺紋塞規(guī)有效徑計算公式:
常用圓柱管螺紋塞規(guī)的檢查標(biāo)準(zhǔn):
規(guī)格 |
螺距/牙數(shù) |
三針尺寸(dm) |
有效徑下限值(E) |
測量值下限(M) |
G1/8 |
0.9071/28 |
(0.53) |
9.141 |
9.948 |
G1/4 |
1.3368/19 |
(0.725) |
12.295 |
13.306 |
G3/8 |
1.3368/19 |
(0.725) |
15.800 |
16.811 |
G1/2 |
1.8143/14 |
(1.10)1 |
19.787 |
21.527 |