Drill Bit Speeds

(Sizes are in inches and speeds are in RPMs)

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Twist

Softwood

Hardwood

Acrylic

Brass

Aluminum

Steel

1/16-3/16

3000

3000

2500

3000

3000

3000

1/4-3/8

3000

1500

2000

1200

2500

1000

7/16-5/8

1500

750

1500

750

1500

600

11/16-1

750

500

-----

400

1000

350

B&D Bullet Pilot-point

Softwood

Hardwood

Acrylic

Brass

Aluminum

Steel

1/8-3/16

3000

3000

3000

2000

1500

3000

-3/8

3000

3000

2400

1500

1000

2000

1/2

3000

1500

1600

1500

750

1200

Brad-Point

Softwood

Hardwood

Acrylic

1/8

1800

1200

1500

1800

1000

1500

3/8

1800

750

1500

1800

750

1000

5/8

1800

500

750

1400

250

750

7/8

1200

250

500

1

1000

250

250

Forstner

Softwood

Hardwood

Acrylic

-3/8

2400

700

----

-5/8

2400

500

250

-1

1500

500

250

1 1/8-1

1500

250

250

1 3/8-2

500

250

----

Multi-Spur

Softwood

Hardwood

2 1/8-4

250

250

Spade

Softwood

Hardwood

-1/2

2000

1500

5/8-1

1750

1500

1 1/8-1 1/2

1500

1500

Stanley Power Bore

Softwood

Hardwood

3/8-1/2

1800

500

-1

1800

750

Circle Cutters

Softwood

Hardwood

Acrylic

1 -3

500

250

250

3 -8

250

250

250

Countersinks

Softwood

Hardwood

Acrylic

Brass, Alum., Steel

2-flute

1400

1400

----

----

5-flute

1000

750

750

250

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