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Step Drills 3/8" Hex
M2 HSS step drills on a 3/8" hex shank, in 11 models from 1/8" up to 1-3/8". One bit drills clean, round holes in sheet metal and thin stock, then steps up to the next size.
Choosing a 3/8" hex step drill
A step drill cuts a clean, round hole in sheet metal and thin plate, and each step takes the hole to the next size up. One bit stands in for a handful of twist drills, which is why electricians and fabricators reach for them. These are M2 HSS bits on a 3/8" hex shank, sold as numbered models, each covering a size range.
The range runs from the 13 Step Drill (1/8" to 1/2") to the 11 Step Drill (3/16" to 1-3/8"). One model, the 1 Step Drill, is a smooth 7/8" cone. Pick the model by the holes you drill most. The sizes in brackets are the first and last step.
Drilling tips
Run slow to medium speed with steady pressure and a drop of cutting oil on steel. Clamp thin sheet so it cannot spin, and back it with scrap wood to keep the exit clean. Stop at the step you need, since a bit left spinning in the cut dulls quickly.
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Common questions
What does the number on a step drill mean?
The number identifies the model. The sizes in brackets, such as 3/8" to 3/4" on the 3 Step Drill, are the first and last step. Choose the model whose range covers the hole sizes you drill.
What shank do these have?
A 3/8" hex shank, so they hold in any chuck that closes on a 3/8" hex. The bits are M2 HSS, which is high speed steel.
Do I need cutting oil?
On steel, yes. A few drops keep the cutting edge cool and stretch bit life. Run slow to medium speed, keep steady pressure, and clear chips from the flutes as you go.
Know-how for Step Drills 3/8" Hex
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