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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0.131 |
#8 |
M4 |
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51-50450 |
4.5 |
0.177 |
3.4 |
0.134 |
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M4 |
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M4 |
M6 |
M6 |
5/32" |
1/4" |
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51-40450 |
4.5 |
0.177 |
3.55 |
0.140 |
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M4.5 & #8 |
M6 & 1/4 |
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1/4" |
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50-110 |
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0.194 |
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0.152 |
#10 |
M4.5 & M5 |
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51-40500 |
5.0 |
0.197 |
4.0 |
0.157 |
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M5 & #10 |
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3/16" |
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M4 & M4.5 |
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5.5 |
0.217 |
4.3 |
0.169 |
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M7 |
M7 |
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51-60550 |
5.5 |
0.217 |
4.5 |
0.177 |
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M5 & M5.5 |
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51-112 |
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0.220 |
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0.165 |
#12 |
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51-40560 |
5.6 |
0.220 |
4.5 |
0.177 |
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M5.5 & #12 |
M7 |
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51-60600 |
6.0 |
0.236 |
4.5 |
0.177 |
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M6 & 1/4 |
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51-50600 |
6.0 |
0.236 |
4.9 |
0.193 |
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M4.5, M5 & M6 |
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M5 & M6 |
M8 |
M8 |
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6.1 |
0.240 |
5.0 |
0.197 |
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5/16" |
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51-60620 |
6.2 |
0.244 |
5.0 |
0.197 |
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M7 & M8 |
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51-40630 |
6.3 |
0.248 |
5.0 |
0.197 |
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M6 & 1/4 |
M8 & 5/16 |
1/4" |
5/16" |
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50-004 |
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0.255 |
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0.191 |
#14 & 1/4 |
M6 & M6.3 |
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51-50700 |
7.0 |
0.276 |
5.5 |
0.217 |
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M9 & M10 & 3/8 |
M7 |
1/8" |
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M9 & M10 |
M9 & M10 |
1/4" |
3/8" |
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51-40710 |
7.1 |
0.280 |
5.6 |
0.220 |
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M7 |
M9 & 3/8 |
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3/8" |
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51-005 |
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0.313 |
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0.234 |
1/8"ssP |
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51-60800 |
8.0 |
0.315 |
6.0 |
0.236 |
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M11, 7/16 & 1/8P |
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51-50800 |
8.0 |
0.315 |
6.2 |
0.244 |
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M8 |
M11 |
M11 |
5/16" |
7/16" |
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51-40800 |
8.0 |
0.315 |
6.3 |
0.248 |
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M8 & 5/16 |
M10, M11 & 7/16 |
5/16" |
7/16" |
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51-005 |
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0.318 |
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0.238 |
5/16" |
M7 & 8 |
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51-007 |
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0.323 |
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0.242 |
7/16" |
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51-60850 |
8.5 |
0.335 |
6.5 |
0.256 |
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M12 |
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51-50900 |
9.0 |
0.354 |
7.0 |
0.276 |
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1/2" |
M12 |
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M9 |
M12 |
M12 |
3/8" |
1/2" |
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51-40900 |
9.0 |
0.354 |
7.1 |
0.280 |
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M9 |
M12 & 1/2 |
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1/2" |
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51-008 |
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0.367 |
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0.275 |
1/2" |
M12 & M12.5 |
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9.5 |
0.374 |
7.0 |
0.276 |
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M13 |
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51-006 |
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0.381 |
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0.286 |
3/8" |
M10 |
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51-41000 |
10.0 |
0.394 |
8.0 |
0.315 |
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M10 & 3/8 |
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3/8" |
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M10 |
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52-61050 |
10.5 |
0.413 |
8.0 |
0.315 |
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M14, M15 & 9/16 |
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51-009 |
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0.429 |
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0.322 |
9/16" |
M14 |
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52-51100 |
11.0 |
0.433 |
9.0 |
0.354 |
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1/4" P |
M14 |
1/4" |
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M14 |
M14 |
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9/16" |
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51-202 |
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0.438 |
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0.328 |
1/8" P |
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