Greenlee 8251 Variable Pitch B...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.23
Greenlee 8251 Variable Pitch Bi-Metal Hole Saw, Multi-Size

Greenlee 8251 Variable Pitch Bi-Metal Hole Saw, Multi-Size

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Model: 825-3/4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$10.23
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Greenlee 8251 Variable Pitch Bi-Metal Hole Saw, Multi-Size

The Greenlee 8251 Variable Pitch Bi-Metal Hole Saw is engineered for electricians, contractors, and tradespeople who need a dependable cutting tool for boring clean, precise holes through a wide range of materials. This hole saw is available in diameters ranging from 1/2" through 4-1/4", so you can match the exact bore to the conduit, fixture, or panel opening on the job. Every size in the 8251 family shares the same extra-tough bi-metal blade construction, a 1-5/8 In cutting depth that lets the saw cut all the way through standard 2x4 wood studs in a single pass, and a steam oxide finish that keeps the saw running cooler during extended use. An extra-thick backplate is common across the line as well, minimizing vibration for a smoother, more controlled cut every time regardless of which diameter you select.

Key Features

  • Diameter Range: Available in sizes from 1/2" up to 4-1/4", covering the common bore diameters needed for conduit, fixture, and panel openings.
  • Deep Cutting Depth: A shared 1-5/8 In cutting depth across the family allows every size to fully penetrate 2x4 wood studs, making it ideal for running conduit, cable, or piping through framing.
  • Durable Bi-Metal Construction: The blade is made of extra-tough bi-metal using the highest grade tool steel for long-lasting sharpness and durability under repeated use, no matter which diameter you choose.
  • Cooler-Running Steam Oxide Finish: The steam oxide finish helps the saw run cooler, reducing heat buildup during extended cutting sessions and helping extend blade life.
  • Extra-Thick Backplate: A reinforced, extra-thick backplate minimizes vibration during cutting, resulting in smoother, easier, and more accurate holes across the entire size range.
  • Multi-Material Versatility: Cuts cleanly through steel, tin, aluminum, fiberglass, wood, and plastic, making it a versatile addition to any electrician's or contractor's toolkit.

Technical Specifications

  • Product Subgroup: Hole Saws & Bits
  • Type: Bi-Metal Hole Saw
  • Available Sizes: 1/2", 3/4", 1", 1-1/4", 1-5/8", 1-3/4", 1-7/8", 2-1/8", 2-3/8", 2-5/8", 2-3/4", 3", 4-1/8", 4-1/4"
  • Cutting Depth: 1-5/8 In
  • Country of Origin: United States

Typical Applications

  • Boring holes for conduit, cable, and wiring runs through wood studs and framing
  • Cutting access holes in steel, tin, and aluminum panels and enclosures
  • Fiberglass and plastic panel penetrations for electrical and mechanical installations
  • Renovation and new construction electrical rough-in work
  • General maintenance and repair drilling tasks requiring a deep, clean cut

Why Greenlee?

Greenlee builds tools for the demands of professional electrical work, and the 8251 Variable Pitch Bi-Metal Hole Saw family is no exception. With its highest grade tool steel bi-metal blade, extra-thick backplate for vibration control, and a steam oxide finish designed to run cooler, this hole saw is built to deliver consistent, reliable performance on the jobsite across every diameter in the lineup. Whether you're boring through wood studs, steel panels, or plastic enclosures, the Greenlee 8251 is a dependable choice for getting the job done efficiently and accurately.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
GREE-20260923
Product Type:
Hole Saw
Product Finish:
Steam Oxide
Country Of Origin:
United States
Department:
Electrical
Product Subgroup:
Hole Saws & Bits
Product Material:
Bi-Metal
Product Group:
Power Tools & Accessories

Greenlee 825-3/4 – Frequently Asked Questions

1) Will a Greenlee 8251 bi-metal hole saw cut all the way through a 2x4 stud in one pass?
Yes. Every size in the Greenlee 8251 family has a 1-5/8 inch cutting depth, which clears the 1-1/2 inch actual thickness of a 2x4 stud, so you get through the framing member in a single pass without backing out to break the plug. That is what makes it workable for pulling conduit or cable runs through studs.
2) Which size hole saw do I need for 1/2 inch and 3/4 inch EMT conduit knockouts?
For standard trade size knockouts, the 7/8 inch opening used for 1/2 inch EMT and the 1-1/8 inch opening used for 3/4 inch EMT are not in the 8251 range, which steps 1/2, 3/4, 1, 1-1/4 inch. If you are boring wood or drilling a clearance hole rather than matching a factory knockout, use the 1 inch for 1/2 inch conduit and the 1-1/4 inch for 3/4 inch conduit so the connector passes through. For exact enclosure knockout diameters, a knockout punch is the right tool, not a hole saw.
3) Can the Greenlee 8251 hole saw cut steel and aluminum panels, or is it wood only?
It cuts both. The blade is bi-metal, and the 8251 is rated for steel, tin, aluminum, fiberglass, wood and plastic, so the same saw handles a steel enclosure wall and a wood stud. Run slow speed and a cutting lubricant in metal to protect the teeth.
4) What sizes does the Greenlee 8251 hole saw come in?
Fourteen diameters, from 1/2 inch up to 4-1/4 inch: 1/2, 3/4, 1, 1-1/4, 1-5/8, 1-3/4, 1-7/8, 2-1/8, 2-3/8, 2-5/8, 2-3/4, 3, 4-1/8 and 4-1/4 inch. Order by the size-specific part number, for example 825-1/2 style numbering for the fractional sizes, 8251 for the 1 inch and 8253 for the 3 inch.
5) Does the Greenlee 8251 hole saw include an arbor and pilot bit?
The 8251 is sold as the saw cup itself, by diameter. You supply the mandrel and pilot drill. Note that hole saws of this type use two thread sizes, a small thread on the smallest cups and a large thread from roughly 1-1/4 inch up, so match the arbor to the diameter you are buying.
6) For cutting large openings in wood framing, is there an alternative to the Greenlee 8251 bi-metal hole saw?
The Milwaukee 49-56-9210 is a 2-1/8 inch BIG HAWG carbide-tooth hole saw, a carbide-tooth design rather than bi-metal. The Greenlee 8251 is offered in a matching 2-1/8 inch size with a bi-metal blade and a 1-5/8 inch cutting depth that passes fully through a 2x4 stud. Carbide-tooth construction is the different element to weigh, since the 8251 is bi-metal and rated for steel, tin, aluminum, fiberglass, wood and plastic.
7) If I am running a hole saw in an impact driver, should I use the Greenlee 8251?
For impact-driver use, the Milwaukee 49-56-9810 is built in the SHOCKWAVE Impact Duty series. The Greenlee 8251 is a variable pitch bi-metal hole saw with an extra-thick backplate for vibration control, intended for boring conduit and cable holes through wood studs, steel, tin, aluminum, fiberglass and plastic in sizes from 1/2 inch to 4-1/4 inch.
8) I need a single hole saw line that covers everything from 1/2 inch conduit knockouts to 4 inch openings. Which should I order?
The Greenlee 8251 bi-metal family spans 1/2 inch through 4-1/4 inch, including 3/4, 1, 1-1/4, 1-5/8, 1-3/4, 1-7/8, 2-1/8, 2-3/8, 2-5/8, 2-3/4, 3, 4-1/8 and 4-1/4 inch, so one line covers both small conduit bores and large panel openings. Among comparable saws, the Milwaukee 49-56-0043 is sold as a 1 inch HOLE DOZER bi-metal saw and the 49-56-9210 as a 2-1/8 inch BIG HAWG carbide-tooth saw, each in a single stated diameter.
9) What does the steam oxide finish on the Greenlee 8251 actually do for me?
Steam oxide is a surface treatment that helps the cup shed heat and hold cutting fluid, so the saw runs cooler on long cuts and deep stacks. Practical benefit on the job is less teeth-bluing when you are cutting a run of holes in steel back to back.
How fast can I get the Greenlee 825-3/4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Greenlee 825-3/4 come with a warranty?
Absolutely. The Greenlee 825-3/4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Greenlee 825-3/4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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