back to homepage Chart page 2

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. 

T.M. Smith
NTA Part Number

Tap Size  

Shank Diameter

Square Size

ANSI

ISO Full

ISO Rel

ISO Full

ISO Rel

 

 

 

 

 

 

 

 

MM

Inch

MM

Inch

Inch

Metric

UNC/UNF

BSW

JIS

DIN
352

DIN
353

DIN
371

DIN
374

DIN
376

DIN
2182

DIN
2183

 

2.24

0.088

1.8

0.071

 

 

 

M3 & #5

 

 

 

 

 

 

 

 

 

 

 

2.5

0.098

2.0

0.079

 

 

M1 & M2

M3.5 & #6

 

 

 

 

 

 

 

 

 

 

 

2.5

0.098

2.1

0.083

 

 

 

 

 

 

 

M1 & M1.8

 

M1 & M1.8

M3.5

M3.5

1/16"

 

51-50280

2.8

0.110

2.1

0.083

 

 

 

 

 

 

 

M2 & M2.6

 

M2 & M2.6

M4

M4

3/32"

5/32"

 

2.8

0.110

2.24

0.088

 

 

M2 & M2.5

 

 

 

 

 

 

 

 

 

 

 

51-60300

3.0

0.118

2.5

0.098

 

 

 

 

 

 

M1 & M2.6

 

 

 

 

 

 

 

 

3.15

0.124

2.5

0.098

 

 

M3
#4 & #5

M4 & #8

 

 

 

 

 

 

 

 

 

 

51-50350

3.5

0.138

2.7

0.106

 

 

 

 

 

 

 

M3

 

M3

M4.5 & M5

M4.5 & M5

1/8"

 

51-40355

3.55

0.140

2.8

0.110

 

 

M3.5 & #6

M4.5 & #10

 

3/16"

 

 

 

 

 

 

 

 

50-106
51-106

 

0.141

 

0.110

#0 THRU
#6

M1.6

 

 

 

 

 

 

 

 

 

 

 

 

51-50400

4.0

0.157

3.0

0.118

 

 

 

 

 

 

 

M3.5

 

M3.5

 

 

7/32"

 

51-40400

4.0

0.157

3.15

0.124

 

 

M4

M5, M5.5
& #12

 

 

 

 

 

 

 

 

 

 

51-60400

4.0

0.157

3.20

0.126

 

 

 

 

 

 

M3 & M3.5

 

 

 

 

 

 

 

50-108
51-108

 

0.168