Tap Adapter Shank and Square Sizes
To determine which tap adapter to select for the tap you are using:
Measure the tap shank and square sizes.
Match the sizes for the shank and square with those on the left side of the chart.
Once matched go to the left side of the chart for the part number.
Please contact Customer Service with any questions or problems.
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T.M. Smith |
Tap
Size |
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Shank
Diameter |
Square Size |
ANSI |
ISO Full |
ISO Rel |
ISO Full |
ISO Rel |
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MM |
Inch |
MM |
Inch |
Inch |
Metric |
UNC/UNF |
BSW |
JIS |
DIN |
DIN |
DIN |
DIN |
DIN |
DIN |
DIN |
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2.24 |
0.088 |
1.8 |
0.071 |
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M3 & #5 |
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2.5 |
0.098 |
2.0 |
0.079 |
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M1 & M2 |
M3.5 & #6 |
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2.5 |
0.098 |
2.1 |
0.083 |
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M1 & M1.8 |
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M1 & M1.8 |
M3.5 |
M3.5 |
1/16" |
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51-50280 |
2.8 |
0.110 |
2.1 |
0.083 |
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M2 & M2.6 |
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M2 & M2.6 |
M4 |
M4 |
3/32" |
5/32" |
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2.8 |
0.110 |
2.24 |
0.088 |
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M2 & M2.5 |
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51-60300 |
3.0 |
0.118 |
2.5 |
0.098 |
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M1 & M2.6 |
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3.15 |
0.124 |
2.5 |
0.098 |
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M3 |
M4 & #8 |
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51-50350 |
3.5 |
0.138 |
2.7 |
0.106 |
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M3 |
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M3 |
M4.5 & M5 |
M4.5 & M5 |
1/8" |
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51-40355 |
3.55 |
0.140 |
2.8 |
0.110 |
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M3.5 & #6 |
M4.5 & #10 |
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3/16" |
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50-106 |
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0.141 |
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0.110 |
#0 THRU |
M1.6 |
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51-50400 |
4.0 |
0.157 |
3.0 |
0.118 |
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M3.5 |
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M3.5 |
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7/32" |
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51-40400 |
4.0 |
0.157 |
3.15 |
0.124 |
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M4 |
M5, M5.5 |
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51-60400 |
4.0 |
0.157 |
3.20 |
0.126 |
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M3 & M3.5 |
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50-108 |
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0.168 |
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