W.L. Fuller Inc. Products Catalog Distributors FAQ Testimonials Videos Links About Us Contact Us

How can I order your products?

What size drill do I use to pre-drill for a wood screw?

What kind of countersink/ counterbore should I use?

What type of drill would I use to pre-drill for other screws?

Order Online

How can I reduce the chance of slippage when using mounted countersinks?

How can I reduce the chances of breaking blades on my countersinks?

How can I reduce the amount of “walking” my drill does when drilling in end-grain?

Does W.L. Fuller resharpen bits?

I need a different size shank than what is available, what can i do?

Drill Charts
Steel Types

How can i order?

Our online distributors stock many of our products for fast and easy delivering.

 

We have a retail store located in Warwick, RI adjacent to our manufacturing plant where you can browse our entire inventory.

[Click here] for location and directions.

 

We have distributors located all over the country for you to order from. 

Please contact us if you have trouble finding one.

[back to top]

What size drill do I use to pre-drill for a wood screw?

We recommend using Taper Point Drills for all wood screws. Taper Point Drills assure the best possible holding power.

The areas highlighted in green are the proper pre-drill sizes and lengths for wood screws.

Wood Screw

Standard Wood Screw Sizes and Predrilling Recommendations

Screw Size (Gauge)

#2

#3

#4

#5

#6

#7

#8

#9

#10

#12

#14

#16

#18

Head Bore Size

Actual Head Size

11/64

13/64

15/64

1/4

9/32

5/16

11/32

23/64

25/64

7/16

1/2

35/64

39/64

Min. Counterbore Dia.

1/4

1/4

1/4

1/4

5/16

5/16

3/8

3/8

7/16

7/16

1/2

9/16

5/8

Recommended Size

1/4

5/16

5/16

3/8

3/8

3/8

3/8

3/8

1/2

1/2

1/2

5/8

5/8

Screw Shank - Hole Size

3/32

7/64

7/64

1/8

9/64

5/32

11/64

3/16

13/64

7/32

1/4

9/32

5/16

Straight Pilot Drill Size

Hardwood

1/16

5/64

5/64

3/32

7/64

7/64

1/8

9/64

9/64

5/32

11/64

3/16

7/32

Softwood

1/16

1/16

1/16

5/64

3/32

3/32

7/64

1/8

1/8

9/64

5/32

11/64

13/64

Tapered Pilot Drill Size

Hardwood

3/32

7/64

7/64

1/8

9/64

5/32

11/64

3/16

13/64

7/32

1/4

9/32

5/16

Softwood

5/64

3/32

3/32

7/64

1/8

9/64

5/32

11/64

3/16

13/64

15/64

17/64

19/64

Recommended Countersink Number

C3

C4

C4

C5

C6

C7

C8

C9

C102

C12

C14

C169

C18

                                                                                          C14 mounted on TPD

Drill Length Recommendations for Countersink/Taper Point Drill Combos

Screw Size (Gauge)

#2

#3

#4

#5

#6

#7

#8

#9

#10

#12

#14

#16

#18

Tapered Drill Size

3/32

7/64

7/64

1/8

9/64

5/32

11/64

3/16

13/64

7/32

1/4

9/32

5/16

Short Length Drill

Min. Screw Length

1/4

5/16

5/16

3/8

7/16

1/2

5/8

11/16

3/4

7/8

3/4

13/16

7/8

Max. Screw Length *

5/8

11/16

11/16

5/8

11/16

13/16

7/8

15/16

1

1-1/8

1-1/4

1-7/16

1-9/16

Regular Length Drill

Min. Screw Length

3/8

7/16

7/16

1/2

9/16

5/8

3/4

13/16

15/16

1

1-1/8

1-1/4

1-3/8

Max. Screw Length **

 1

1-1/2

1-3/8

1-3/8

1-1/2

1-3/4

1-7/8

2-1/8

2-1/4

2-3/8

2-5/8

2-5/16

2-11/16

Long Length Drill

Min. Screw Length

9/16

9/16

9/16

5/8

11/16

3/4

7/8

15/16

1-1/16

1-1/8

1-5/16

1-7/16

1-9/16

Max. Screw Length***

1-3/4

2

1-7/8

2-1/8

2-3/8

2-3/8

2-3/4

2-3/4

3

3

3-1/8

3-1/16

3-3/16

8” Long Drills

Min. Screw Length

N/A

N/A

N/A

3/4

13/16

1

1-1/16

1-3/16

1-1/4

1-1/4

1-1/2

1-5/8

1-3/4

Max. Screw Length***

N/A

N/A

N/A

4-3/4

4-3/4

4-3/4

4-3/4

4-3/4

4-3/4

4-3/4

4-3/4

4-11/16

4-11/16

                     * = 1/2” to 3/4” of shank for chucking           ** = 3/4” to 1” of shank for chucking         *** = Set screws positioned at end of twist

[back to top]

What kind of Countersink/Counterbore should I use?

To answer this question, we will need a little more information...

What type of material are you boring into?

- hardwood
- softwood
- aluminum
- stainless steel
- mild steel
- steel
- fiberglass
- graphite
- soft plastic
- hard plastic
- plexiglass

How deep are you going to bore?

- bring the fastener flush with the material.
- sink the fastener enough to allow for plugging
- deeper than enough for plugging

Are you going to be using a screw or a bolt?

If you are using a screw, what is the angle under the head of the screw?

- 82 (most common)
- 60
- 90
- 100
- 120

Home use or for production applications?

To be used in hand held equipment or stationary machinery?

You can E-mail the answers to these questions to us at info@wlfuller.com and we will get back to you promptly with an accurate recommendation

[back to top]

What type of drill would I use to pre-drill for other screws?

To answer this question, we will need a little more information...

What material are you pre-drilling?

- hardwood
- softwood
- aluminum
- stainless steel
- mild steel
- steel
- fiberglass
- graphite
- soft plastic
- hard plastic
- plexiglass

What type of screw are you using?

You can E-mail the answers to these questions to us at info@wlfuller.com and we will get back to you promptly with an accurate recommendation

[back to top]

When using mounted countersinks...

To reduce the chance of countersink slippage, make sure that the set screws of the countersink are positioned in the flutes of the drill.

[back to top]

When drilling through material and countersinking...

To reduce the chance of blade breakage on the countersinks, make sure that the countersink is positioned on the drill so that it starts to cut before the drill breaks through the other side of the material.

[back to top]

When drilling in end-grain...

To reduce the amount the drill will follow the grain or “walk”, we recommend using a brad point drill with the spurs removed. This will allow the brad point to guide the drill as straight as possible.

[back to top]

Does W.L. Fuller resharpen bits?

Yes, we offer a top quality sharpening service for most cutting tools. We use time tested and proven techniques to sharpen all of our tools. 

[Click here] for more information regarding sharpening.

[back to top]

I need a different size shank...

We do offer shank modification to meet most any needs you might have.

Please [Click here] for more information regarding shank modification.

[back to top]

Order-On-line
emailus