• HSS step drill 6-30mm
  • titanium coated hex shank step drill
  • SDS plus step drill for metal working
  • spiral flute step drill for metal working
  • 3-pc hss step drill set in blister package
  • 3-pc titanium coated step drill in plastic hanging bag

Features:

1.CBN-ground flutes
2.Walter 5-axis CNC grinded
3.Cobalt Coated & TiALN Coated available
 

CBN ground Step Drill:

The CBN ground and spiral flutes guarantee quiet running and high cutting performance. Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily. The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks. The cone makes it easier to withdraw the tool from the material.
 

Specification:

1. HSS Step Drills for drilling cylindrical holes in solid material up to a thickness of 4mm(5/32").
2. Burr-free and vibration-free drilling.
3. The tapered cutting edges of the next drill step can be used for simultaneous deburring or chamfering of the finished bore at the same time.
4. Drilling perfectly round holes in steel, brass, copper, aluminum, wood and plastic.
5. Drills up to 13 holes sizes with one bit.
6. Ideal tool for sheet metal workers, electrical contractor, auto mechanics, and general contractors.
7. Surface treatment available: White Finish, Black Oxide, Titanium Coated, Cobalt Coated, TiALN Coated.
 

What is HSS Spiral Grooved Step Drills

The unibit (often called a step drill) was invented by Harry C. Oakes and patented in 1973. It was sold only by the Unibit Corporation in the 1980s until the patent expired, and was later sold by other companies.
A unibit is a roughly conical bit with a stairstep profile. Due to its design, a single bit can be used for drilling a wide range of hole sizes. Some bits come to a point and are thus self-starting. The larger-size bits have blunt tips and are used for hole enlarging.
Unibits are commonly used on sheet metal and in general construction. One drill bit can drill the entire range of holes necessary on a countertop, speeding up installation of fixtures. They are most commonly used on softer materials, such as plywood, particle board, drywall, acrylic, and laminate. They can be used on very thin sheet metal, but metals tend to cause premature bit wear and dulling.
Unibits are ideal for use in electrical work where thin steel, aluminum or plastic boxes and chassis are encountered. The short length of the unibit and ability to vary the diameter of the finished hole is an advantage in chassis or front panel work. The finished hole can often be made quite smooth and burr-free, especially in plastic.
An additional use of unibits is deburring holes left by other bits, as the sharp increase to the next step size allows the cutting edge to scrape burrs off the entry surface of the work piece. However, the straight flute is poor at chip ejection, and can cause a burr to be formed on the exit side of the hole, more so than a spiral twist drill bit turning at high speed.
 

For more details on Unibits, please check catalogue or contact us.