HeliCoil Insert Lengths & Drill Sizes

UNC
Insert Size Drill Size Wire Thread Insert Length
1D 1.5D 2D 2.5D 3D

2-56

2.3 mm 0.086 0.129 0.172 0.215 0.258

3-48

2.7 mm 0.099 0.148 0.198 0.248 0.297

4-40

3.0 mm 0.112 0.168 0.224 0.280 0.336

5-40

3.4 mm 0.125 0.188 0.250 0.312 0.375

6-32

3.7 mm 0.138 0.207 0.276 0.345 0.414

8-32

11/64 0.164 0.246 0.328 0.410 0.492

10-24

5.1 mm 0.190 0.285 0.380 0.475 0.570

12-24

5.8 mm 0.216 0.324 0.432 0.540 0.648

1/4-20

6.7 mm 0.250 0.375 0.500 0.625 0.750

5/16-18

8.3 mm 0.312 0.469 0.625 0.781 0.938

3/8-16

9.9 mm 0.375 0.562 0.750 0.938 1.125

7/16-14

29/64 0.438 0.656 0.875 1.094 1.313

1/2-13

33/64 0.500 0.750 1.000 1.250 1.500

9/16-12

14.75 mm 0.562 0.844 1.125 1.406 1.688

5/8-11

16.5 mm 0.625 0.938 1.250 1.563 1.875

3/4-10

19.75 mm 0.750 1.125 1.500 1.875 2.250

7/8-9

23.0 mm 0.875 1.313 1.750 2.188 2.625

1-8

1-1/32 1.000 1.500 2.000 2.500 3.000

1.1/8-7

1-5/32 1.125 1.688 2.250 2.813 3.375

1.1/4-7

1-9/32 1.250 1.875 2.500 3.125 3.750

1.3/8-6

36.0 1.375 2.063 2.750 3.438 4.125

1.1/2-6

1-35/64 1.500 2.250 3.000 3.750 4.500
UNF
Insert Size Drill Size Wire Thread Insert Length
1D 1.5D 2D 2.5D 3D

2-64

2.3 mm 0.086 0.129 0.172 0.215 0.258

3-56

2.65 mm 0.099 0.148 0.198 0.248 0.297

4-48

3.0 mm 0.112 0.168 0.224 0.280 0.336

5-44

3.3 mm 0.125 0.188 0.250 0.312 0.375

6-40

3.7 mm 0.138 0.207 0.276 0.345 0.414

8-36

11/64 0.164 0.246 0.328 0.410 0.492

10-32

5.1 mm 0.190 0.285 0.380 0.475 0.570

1/4-28

6.6 mm 0.250 0.375 0.500 0.625 0.750

5/16-24

8.2 mm 0.312 0.469 0.625 0.781 0.938

3/8-24

9.8 mm 0.375 0.562 0.750 0.938 1.125

7/16-20

29/64 0.438 0.656 0.875 1.094 1.313

1/2-20

33/64 0.500 0.750 1.000 1.250 1.500

9/16-18

37/64 0.562 0.844 1.125 1.406 1.688

5/8-18

41/64 0.625 0.938 1.250 1.563 1.875

3/4-16

49/64 0.750 1.125 1.500 1.875 2.250

7/8-14

22.75 mm 0.875 1.313 1.750 2.188 2.625

1-12

26.0 mm 1.000 1.500 2.000 2.500 3.000

1.1/8-12

29.25 mm 1.125 1.688 2.250 2.813 3.375

1.1/4-12

1-17/64 1.250 1.875 2.500 3.125 3.750

1.3/8-12

35.5 mm 1.375 2.063 2.750 3.438 4.125

1.1/2-12

38.5 mm 1.500 2.250 3.000 3.750 4.500
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