Description
The Irwin Unibit Step Drill Bits, High Speed Steel Fractional Hole Enlarging is a step drill bit. Cutting diameter (max) 1 in, 1-3/8 in; cutting diameter (min) 9/16 in, 13/16 in; cutting edge material HSS. Irwin lists 3 flatted shank prevents slipping in drill chuck; Also available with titanium nitride coating for longer life. Available in 2 versions.
Specifications
| Item | Irwin data |
|---|---|
| Cutting Diameter (max) | 1 in; 1-3/8 in |
| Cutting Diameter (min) | 9/16 in; 13/16 in |
| Cutting Edge Material | HSS |
| Material Thickness (max) | 1/8 in |
| Measurement Type | Fractional |
| No. of Steps | 8; 10 |
| Shank Diameter | 7/16 in |
| Width | 3 in |
| Height | 1.3 in; 1.4 in |
Source: Irwin published product data.
Irwin Unibit fractional step drills use a single-flute HSS cutting edge for enlarging round holes in thin stainless steel, copper, brass, aluminum, and plastic, in 8-step and 10-step models covering 9/16 to 1-3/8 inch.
- Single-flute cutting edge for greater control through steps
- 3 flatted shank prevents slipping in drill chuck
- Also available with titanium nitride coating for longer life
- Patented single-flute cutting edge gives the user a true round hole every time
- Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates
Available in 2 versions. Choose one from the list to see the exact item number and price.
Item Numbers
Variant item numbers:
10220-IRWIN – 9/16 in to 1 in · 8 Steps
10221 – 13/16 in to 1-3/8 in · 10 Steps
