Jobber-length drills are the most common type of drill bit. The length of the flutes is ten times the diameter of the drill bit, meaning they will drill a hole that is 10D deep. Self Starting Step Drill Bits offer a unique tip design which eliminates not only skidding, but also the need for center punching.
Jobber Length Drill Bits and Step Drill Bits
All Jobber Length Drill Bits and Step Drill Bits have Split Points and come in two different materials:
- The Split Point reduces “walking” which is the tendency of a spinning bit to rotate away from the point at which you want to drill
- The High Speed Steel (HSS) allows the bit to cut faster than High Carbon Steel.
- The Titanium Nitride (TiN) coating is an extremely hard ceramic.
At room temperature, HSS and high carbon steel have an equivalent hardness; at elevated temperatures, HSS becomes advantageous
It is often used as a coating on HSS to improve hardness and durability
Drill Bit Kits
Drill bit kits are available for step drill bits and jobber length drill bits. These convenient drill bit kits include:
- Three-piece Step Drill Bit Kit - High Speed Steel (HSS), bright finish, spiral fluted with split point.Drill size 1: 6 steps from 3/16” to 1/2” with 1/16” increments.
- 21-Piece Jobber Length Drill Bit Set with fractional sizes from 1/16” to 3/8” in increments of 1/64”, in high-speed steel or Titanium coated (TiN) high speed steel, 118 degrees point
- 29-Piece Jobber Length Drill Bit Set with fractional sizes from 1/16” to 1/2” in increments of 1/64”, in high speed steel (HSS) or Titanium coated (TiN) high speed steel, 118 degrees point
Shank size 1/4”Drill size 2: 13 steps from 1/8” to 1/2” with 1/32” increments.
Shank size 1/4”Drill size 3: 9 steps from 1/4” to 3/4“ with 1/16” increments.
Shank size 3/8”
Machine Taps
High speed steel machine taps are available in nine sizes:
- 4-40 to 3/8-16 coarse UNC and 4-48 to 3/8-24 fine UNF thread sizes
- Spiral point, chamfer type B
Knockout Punches
Electrical knockout punch hole cutting tools include punch, die and draw bolt:
- 22mm and 30mm pushbutton/pilot device mounting hole sizes
- 1/2 inch to 2 inch mounting hole sizes
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