Greenlee 33L Spade Bit, 16" Le...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$23.73
Greenlee 33L Spade Bit, 16" Length, Hex Shank

Greenlee 33L Spade Bit, 16" Length, Hex Shank

(No reviews yet) Write a Review

Model: 50315390

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

$23.73
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Greenlee 50315412 33L Spade Bit, 7/8 IN Diameter, 16 IN Length

The Greenlee 50315412 is a 33L series spade bit engineered for fast, clean boring through hardwood, softwood, plywood, and drywall. This bit measures a full 16 IN (406.400 MM) overall length, giving installers extra reach for boring through deep wall cavities, joists, and studs when running cable and conduit. The 7/8 IN (22.200 MM) diameter cutting head is matched to a 1/4 IN (6.400 MM) hexagonal shank designed to seat securely in standard drill chucks and quick-change drivers, minimizing slippage under load during extended installation work. With a compact 1.700 IN product width and low-profile 0.100 IN paddle thickness, this spade bit is purpose-built for the electrician's rough-in workflow where consistent hole sizing and dependable chip clearance matter on every pass.

Key Features

  • Bit Diameter: 7/8 IN (22.200 MM) cutting head sized for standard electrical rough-in boring applications.
  • Overall Length: 16.000 IN (406.400 MM) length for reaching deep into wall cavities, joists, and framing members.
  • Shank Size & Type: 1/4 IN (6.400 MM) hexagonal shank for secure, slip-resistant engagement in drill chucks and quick-connect drivers.
  • Application Versatility: Rated for boring hardwood, softwood, plywood, and drywall, making it a flexible choice across varied jobsite materials.
  • 33L Series Design: Spade-style paddle geometry delivers efficient chip removal and consistent hole diameter for repeated boring passes.
  • Compact Profile: Product width of 1.700 IN and product height of 0.100 IN keep the flat paddle design low-profile for controlled entry into tight framing bays.
  • Overall Product Length: 17.500 IN total product length and 2.975 CI volume for reference in tool storage and kitting.

Technical Specifications

  • Application: For Bore Hardwood, Softwood, Plywood And Drywall
  • Bit Diameter: 7/8 IN (22.200 MM)
  • Overall Length: 16.000 IN (406.400 MM)
  • Product Height: 0.100 IN
  • Product Length: 17.500 IN
  • Product Width: 1.700 IN
  • Shank Size: 1/4 IN (6.400 MM)
  • Shank Type: Hexagonal
  • Volume: 2.975 CI
  • Country Of Origin: China

Typical Applications

  • Electrical Rough-In Wiring and Cable Pass-Through Boring
  • Framing and Stud Boring for Conduit Runs
  • Drywall and Plywood Penetration for Device Installation
  • Residential and Commercial Construction Boring Tasks
  • Renovation and Retrofit Wiring Projects

Why Greenlee?

Greenlee builds tools specifically for the demands of professional electrical installation, and the 50315412 spade bit is sized and shanked to keep pace with daily rough-in work. The hexagonal shank and 7/8 IN cutting diameter are matched to real jobsite tasks like boring hardwood studs, softwood framing, plywood sheathing, and drywall for cable and conduit runs. Electricians and contractors rely on Greenlee boring bits for consistent hole sizing and dependable performance across repeated use on the job, and the 16 IN overall length gives crews the reach needed for deep-cavity rough-in without swapping tools mid-run.

Manufacturer Resources

Spec Sheet

Product Specs

Product Width:
1.700 IN
Department:
Electrical
Overall Length:
16.000 IN (406.400 MM)
Volume:
2.975 CI
Shank Type:
Hexagonal
Product Type:
Spade Terminal
Shank Size:
1/4 IN (6.400 MM)
Product Length:
17.500 IN
Product Height:
0.100 IN
Product Subgroup:
Drill & Driver Bits
Product Group:
Power Tools & Accessories
Application:
For Bore Hardwood, Softwood, Plywood And Drywall

Greenlee 50315390 – Frequently Asked Questions

1) What diameters does the Greenlee 33L 16-inch spade bit come in?
Three cutting diameters: 5/8 inch (MPN 50315390), 7/8 inch (50315412), and 1 inch (50315420). All three are the 16 inch long 33L paddle bit on a 1/4 inch hex shank. For electrical rough-in, 7/8 inch is the common pick for pulling NM cable through studs, and 1 inch gives clearance for multiple runs or small flex.
2) Will a 1/4 inch hex shank spade bit fit my impact driver?
Yes. The 33L bit uses a 1/4 inch hexagonal shank, which is the standard quick-change size for cordless impact drivers and hex bit holders, and it also chucks up in a keyless or keyed drill chuck. No adapter needed either way.
3) Is 16 inches long enough to bore through a stacked 2x4 wall or through joists at an angle?
The cutting length is 16 inches overall, which clears a doubled or tripled 2x4 plate and gives room to angle the bit through a joist bay without the chuck fouling the framing. Total product length including packaging reference is 17.5 inches. If you need to reach further, you would step up to a bit extension rather than a longer paddle.
4) Can I use this spade bit in drywall and plywood, or is it only for framing lumber?
Rated for hardwood, softwood, plywood and drywall. That covers stud and joist boring for cable runs as well as punching through sheathing or board for device work. It is a wood-boring paddle bit, so it is not for masonry, tile or metal.
5) Spade bit or auger bit for running NM cable through studs?
A spade bit like the 33L is the cheaper, thinner-kerf option and works well in softwood framing, plywood and drywall, which is what it is rated for. It needs the drill to supply the feed pressure. A self-feeding auger pulls itself through and is the better call for high-volume boring through hardwood or engineered lumber. For typical residential rough-in at 5/8 to 1 inch holes, the paddle bit does the job and is far less costly to replace when it hits a nail.
6) Do I get all three diameters together or is each one ordered separately?
Each diameter is its own item, ordered by part number: 50315390 for 5/8 inch, 50315412 for 7/8 inch, 50315420 for 1 inch. If you are standardizing a crew's kit, order the sizes you need individually rather than expecting a set.
7) How thick is the paddle on the Greenlee 33L spade bit?
The paddle measures 0.100 inch thick with a 1.700 inch width across the cutting head on the 7/8 inch size. That flat, thin profile is what lets it start in a tight framing bay and clear chips on the way through instead of packing the hole.
How fast can I get the Greenlee 50315390 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 50315390 come with a warranty?
Absolutely. The Greenlee 50315390 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 50315390?
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
Why buy the Greenlee 50315390 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!