Screws and Bolt Size Bolt Screw Size to be Removed

Pre-Drill Size

Extractor Size

3/16" - 5/16", 5 mm - 8 mm, No. 10

9/64"

#1 straight

3/8", 10 mm

3/16"

#2 straight

7/16", 10 mm, 1/8" NPT, 1/8" BSP

15/64"

#3 straight

1/2" - 9/16", 12 mm - 14 mm, 1/4" NPT, 1/4" BSP

5/16"

#4 straight

5/8", 16 mm, 3/8" NPT, 3/8" BSP

3/8"

#5 straight

3/4", 20 mm, 1/2" NPT, 1/2" BSP

15/32"

#6 straight

7/8", 22 mm, 5/8" BSP

9/16"

#7 straight

3/32" - 5/32", 2.5 mm - 4 mm, No. 3 - No. 6

5/64"

#1 spiral

5/32" - 7/32", 4 mm - 6 mm, No. 6 - No. 12

7/64"

#2 spiral

7/32" - 9/32", 6 mm - 8 mm, No. 14

5/32"

#3 spiral

9/32" - 3/8", 8 mm - 10 mm, 1/8" NPT, 1/8" BSP

1/4"

#4 spiral

3/8" - 5/8", 10 mm - 16 mm, 1/4" NPT, 1/4" BSP

19/64"

#5 spiral

5/8" - 7/8", 16 mm - 22 mm, 3/8" NPT, 3/8" BSP

13/32"

#6 spiral

7/8" - 1-1/8", 22 mm - 27 mm, 1/2" NPT, 1/2" BSP

17/32"

#7 spiral

1-1/8" - 1-3/8", 27 mm - 36 mm, 3/4" NPT, 3/4" BSP

13/16"

#8 spiral

1-3/8" - 2", 36 mm - 52 mm, 1" NPT, 1" BSP

1-1/16"

#9 spiral

2-1/8" - 2-1/2", 52 mm - 68 mm, 1-1/4" NPT, 1-1/4" BSP

1-5/16"

#10 spiral

No. 12, 5 mm

1/8"

1/8" multi-spline

1/4", 6 mm, No. 14

5/32"

5/32" multi-spline

5/16", 7 mm - 8 mm

3/16"

3/16" multi-spline

3/8", 9 mm - 10 mm

7/32"

7/32" multi-spline

7/16", 11 mm

1/4"

1/4" multi-spline

1/2", 12 mm

9/32"

9/32" multi-spline

9/16", 14 mm

5/16"

5/16" multi-spline

5/8", 16 mm

11/32"

11/32" multi-spline

11/16", 18 mm

3/8"

3/8" multi-spline

3/4", 19 mm

13/32"

13/32" multi-spline

13/16", 20 mm

7/16"

7/16" multi-spline

7/8", 22 mm

15/32"

15/32" multi-spline

15/16", 24 mm

1/2"

1/2" multi-spline

1", 25 mm

17/32"

17/32" multi-spline

1-1/16", 27 mm

9/16"

9/16" multi-spline

1-1/8", 28 mm

19/32"

19/32" multi-spline

1-3/16", 30 mm

5/8"

5/8" multi-spline

1-1/4", 32 mm

21/32"

21/32" multi-spline

1-5/16", 33 mm

11/16"

11/16" multi-spline

1-3/8", 35 mm

23/32"

23/32" multi-spline

1-7/16", 36 mm

3/4"

3/4" multi-spline

1-1/2", 38 mm

25/32"

25/32" multi-spline

1-9/16", 40 mm

13/16"

13/16" multi-spline

1-5/8", 42 mm

27/32"

27/32" multi-spline

1-11/16", 43 mm

7/8"

7/8" multi-spline