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[W.L. Fuller, Inc.] [Products] [Drills] [Step Drills] [Wood Screw Step Drills]
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These Step Drills are designed to predrill clearance holes through the first piece of wood and pilot holes for the threads in the second piece of wood. Sizes and lengths match standard screw sizes. Countersinks can be used to complete a 3-step operation in 1 step. Made of top quality High Speed Steel. 

SD1216

 

A

B

C

D

E

 Tool Number

 Screw Size

Wood Screw  Length

Production Screw Depth **

Drill Dia ***

 Pilot Dia

Pilot Length

Twist Length

Overall Length

SD0404

#4

1/2

5/16

7/64

.075

5/16

1-1/2

2-5/8

SD0406

 

3/4

1/2

 

 

1/2

 

 

SD0408

 

1

5/8

 

 

5/8*

2-1/2

3-3/4

SD0410

 

1-1/4

13/16

 

 

13/16*

 

 

SD0604

#6

1/2

5/16

9/64

.094

5/16

1-3/4

2-7/8

SD0606

 

3/4

1/2

 

 

1/2

 

 

SD0608

 

1

5/8

 

 

5/8

 

 

SD0610

 

1-1/4

13/16

 

 

13/16*

3

4

SD0612

 

1-1/2

1

 

 

1*

 

 

SD0616

 

2

1-5/16

 

 

1-5/16*

 

 

SD0804

#8

1/2

5/16

11/64

.112

5/16

2-1/8

3-1/4

SD0806

 

3/4

1/2

 

 

1/2

 

 

SD0808

 

1

5/8

 

 

5/8

 

 

SD0810

 

1-1/4

13/16

 

 

13/16

 

 

SD0812

 

1-1/2

1

 

 

1

3-3/8

4-1/2

SD0816

 

2

1-5/16

 

 

1-5/16*

 

 

SD0820

 

2-1/2

1-5/8

 

 

1-5/8*

 

 

SD0824

 

3

2

 

 

2*

6

8

SD1006

#10

3/4

1/2

13/64

.130

1/2

2-7/16

3-5/8

SD1008

 

1

5/8

 

 

5/8

 

 

SD1010

 

1-1/4

13/16

 

 

13/16

 

 

SD1012

 

1-1/2

1

 

 

1

 

 

SD1016

 

2

1-5/16

 

 

1-5/16*

3-5/8

4-1/2

SD1020

 

2-1/2

1-5/8

 

 

1-5/8*

 

 

SD1024

 

3

2

 

 

2*

6

8

SD1208

#12

1

5/8

7/32

.148

5/8

2-1/2

3-3/4

SD1210

 

1-1/4

13/16

 

 

13/16

 

 

SD1212

 

1-1/2

1

 

 

1

 

 

SD1216

 

2

1-5/16

 

 

1-5/16

3-5/8

5

SD1220

 

2-1/2

1-5/8

 

 

1-5/8*

 

 

SD1224

 

3

2

 

 

2*

6

8

SD1228

 

3-1/2

2-5/16

 

 

2-5/16*

 

 

SD1408

#14

1

5/8

1/4

.165

5/8

2-3/4

4

SD1410

 

1-1/4

13/16

 

 

13/16

 

 

SD1412

 

1-1/2

1

 

 

1

 

 

SD1416

 

2

1-5/16

 

 

1-5/16

 

 

SD1420

 

2-1/2

1-5/8

 

 

1-5/8*

3-3/4

5

SD1424

 

3

2

 

 

2*

 

 

SD1428

 

3-1/2

2-5/16

 

 

2-5/16*

6

8

SD1432

 

4

2-5/8

 

 

2-5/8*

 

 

SD1610

#16

1-1/4

 

17/64

.184

13/16

2-7/8

4-1/8

SD1612

 

1-1/2

 

 

 

1

 

 

SD1616

 

2

 

 

 

1-5/16

 

 

SD1620

 

2-1/2

 

 

 

1-5/8*

3-7/8

5-1/4

SD1624

 

3

 

 

 

2*

 

 

SD1628

 

3-1/2

 

 

 

2-5/16*

6

8

SD1632

 

4

 

 

 

2-5/8*

 

 

SD1816

#18

2

 

19/64

.204

1-5/16

3-1/16

4-3/8

SD1820

 

2-1/2

 

 

 

1-5/8

4

5-1/4

SD1824

 

3

 

 

 

2*

 

 

SD1828

 

3-1/2

 

 

 

2-5/16*

6

8

SD1832

 

4

 

 

 

2-5/8*

 

 

SD2012

#20

2-1/2

 

5/16

.223

1-5/8

4

5-1/4

SD2024

 

3

 

 

 

2

 

 

SD2028

 

3-1/2

 

 

 

2-5/16*

6

8

SD2032

 

4

 

 

 

2-5/8*

 

 

SD2424

#24

3

 

3/8

.260

2

4-1/4

5-1/2

SD2432

 

4

 

 

 

2-5/8

6

8

SD2436

 

4-1/2

 

 

 

3*

 

 

SD2448

 

6

 

 

 

4*

7-1/2

10

* Step Drills with extra long pilot lengths are not guaranteed against breakage.

** Production Screw Depth (for Production or Sheet Rock screws)

To find this dimension, subtract the thickness of the top piece of wood from the length of the screw.

*** All shank diameters (F) are the same size as the  (A) drill diameter.
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