Twist drill bits with hexagon drive
Drilling and tapping with the same cordless driver, without a chuck and without changing tools: the twist drill bits have a 1/4 inch hexagon drive and fit any bit holder. In HSS-G from 1.0 to 10.2 mm, plus versions for wood and complete combination bit sets.
The tapping drill sizes are built in
Several diameters carry in their name the thread size they drill the pilot hole for. That saves a look at the table:
| Bit | Pilot hole for |
|---|---|
| 2.5 mm | M 3 |
| 3.3 mm | M 4 |
| 4.2 mm | M 5 |
| 5.0 mm | M 6 |
| 6.8 mm | M 8 |
| 8.5 mm | M 10 |
| 10.2 mm | M 12 |
The remaining diameters from 1.0 to 10.0 mm fill the series for all other drilling. How tapping drill sizes are determined in general is in Calculate tap drill size.
Combination bits: three operations in one
The combination bit sets and the combination bit box cover M 3 to M 10, also TiN-coated and in UNC and UNF from No. 8 to 3/8 inch. A combination bit drills the pilot hole, cuts the through-hole thread and deburrs the edge in one go, up to 1 x D thread depth and up to 600 N/mm² tensile strength.
Wood
The wood twist drill bits in HSS-G come in 3.0, 4.0, 5.0, 6.0, 8.0 and 10.0 mm, with a centre point for a clean start without wandering.
Taps with the same drive are under bits, complete cases under tap and die sets.
