Greenlee
Greenlee 825 2-1/2 in Variable Pitch Hole Saw
Cuts steel with a bi-metal variable-pitch blade for smoother, faster drilling
- Variable pitch teeth cut steel smoothly
- Bi-metal construction resists heat and wear
- 2-1/2 inch diameter handles large holes
- 1-5/8 inch depth reaches through thick stock
- 7/16 and 1/2 inch shanks fit common drills
2-1/2 in Variable Pitch Hole Saw
The Greenlee 825 hole saw cuts steel with a bi-metal tooth construction and a 4/6 variable pitch design. It suits maintenance technicians and metal fabricators who need clean holes in structural or sheet steel. The 1 5/8 in maximum cutting depth handles typical plate and pipe wall thicknesses. This tool is not for woodworkers or installers cutting non-ferrous materials exclusively.
Arbor not included with 7/16 in
The saw ships without an arbor so users select a separate mandrel matching their drill chuck. Accepted shank sizes of 7/16 in and 1/2 in fit common industrial drill motors and magnetic base drills. A 1/4 in diameter pilot drill guides the cut but must be sourced separately. This flexibility suits shops standardising on one arbor system across multiple saw diameters.
Bi-metal teeth manage heat during steel cutting
Variable pitch teeth reduce vibration and promote chip clearance when drilling mild or alloy steel. The bi-metal edge resists heat buildup better than carbon steel blades during sustained cuts. Hand-held drilling produces manageable noise levels for short operations. The saw is not impact rated so it should be used with rotary drills only.
Highlights
- Variable pitch teeth cut steel smoothly
- Bi-metal construction resists heat and wear
- 2-1/2 inch diameter handles large holes
- 1-5/8 inch depth reaches through thick stock
- 7/16 and 1/2 inch shanks fit common drills
Specifications
| Brand | GREENLEE |
|---|
Questions about this item
How does the 4/6 variable-pitch tooth design affect cutting speed in steel?
The alternating 4- and 6-teeth-per-inch pattern reduces vibration and clears chips faster, giving a smoother, quicker cut through steel than a constant-pitch saw.
What arbor shank sizes does the 7/16 in / 1/2 in specification require for a secure fit?
You need an arbor with a 7/16 in or 1/2 in shank that accepts the saw's 2-1/2 in diameter mounting hole; the arbor itself is not included.
Why must the 1/4 in pilot drill be seated before the saw teeth contact the workpiece?
Starting the pilot drill first centers the hole saw and prevents the teeth from walking or binding during the initial plunge.
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