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OSTAR Tools --> Products --> Cutting for metal --> Step Drills
 
HSS Step Drills
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Step-Drill Bits are perfect for drilling multiple-size holes in thin sections of metal, plastic and wood using a single bit. Each step drills does the work of many drill-bit sizes. Drills round holes in most metals (steel, brass, aluminum, copper) up to 1/8" (3.2mm) thick as well as in plastic and wood. No center punching or pilot hole drilling is required on most sizes. The bits are easy to keep sharp, and the hole size is easily determined by the diameter markings that are permanently laser-etched in the flute areas.
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Drills true round holes in stainless steel, mild steel, brass, copper, aluminum, plastic and woods up to 1/8" thick.
Stainless steel and aluminum should be drilled at speeds no faster than 300 rpm. Cutting oil must be used to preserve the life of the cutting tool when exceeding diameters of 1/2" and up.
Electrical, automotive, plumbing, sheet metal duct work, heating & cooling, pilot holes for knockout punches.
Recommended Cutting Speeds*
Size
RPM
1/8" - 3/8"
1200 RPM
3/8" - 1/2"
600 RPM
1/2" - 5/8"
400 RPM
5/8" - 3/4"
350 RPM
3/4" - 7/8"
300 RPM
1"
260 RPM
1 1/8"
240 RPM
1 1/2"
200 RPM
* These are approximate RPM speeds designed to extend the life of your cutting tools. Cutting oil should always be used.
 
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