Irwin 3548521C Magnetic Nutset...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5.64
Irwin 3548521C Magnetic Nutsetter, 3/8" Hex Drive, Lobular Design

Irwin 3548521C Magnetic Nutsetter, 3/8" Hex Drive, Lobular Design

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Model: 3548521C

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

$5.64
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Irwin 3548521C Magnetic Nutsetter, 3/8" Hex Drive

The Irwin 3548521C Magnetic Nutsetter is a 3/8" hex drive tool built with a lobular design that drives sheet metal screws and other hexagonal head fasteners from the sides of the fastener rather than forcing the corners to turn. This socket body measures 9/16" in diameter and is engineered to reduce stripping damage while providing extra clearance on the corners of the fastener where paint build-up can occur. Sold as a single unit, this nutsetter is a practical addition to any professional's driver bit and fastening tool collection for sheet metal and construction work.

Key Features

  • Trade Size: 3/8" nutsetter size with a 9/16" socket body diameter for a secure fit on hexagonal head fasteners.
  • Lobular Design: Drives the fastener on the sides instead of forcing the corners to turn, which reduces stripping damage during repeated use.
  • Fastener Clearance: Provides more clearance on the corners of the fastener where paint build-up can occur, helping maintain a clean, positive drive engagement.
  • Application: Designed for use with sheet metal screws and other hexagonal head fasteners commonly found on jobsites.
  • Magnetic Retention: Magnetic design helps hold the fastener in place during driving for faster, more accurate starts.
  • Pack Quantity: Sold individually, one nutsetter per pack.

Technical Specifications

  • Socket Body Diameter: 9/16"
  • Size: 3/8"
  • Item #: 3548521C
  • Pack Qty: 1

Typical Applications

  • Sheet Metal Fabrication and Installation
  • HVAC Ductwork Assembly
  • Roofing and Siding Fastener Driving
  • General Construction and Maintenance Work
  • Driver Bit and Fastening Tool Kits

Why Irwin?

Irwin's lobular design nutsetters are engineered to minimize fastener stripping and extend tool life, giving tradespeople a dependable option for driving sheet metal screws and hexagonal head fasteners. With precise 9/16" socket body sizing and added clearance around fastener corners, this 3/8" magnetic nutsetter delivers consistent, reliable performance for professional fastening applications.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
IRW-20260924
Product Type:
Nut Setter
Connection Type:
Hexagonal
Pack Qty:
1
Department:
Electrical
Product Subgroup:
Screwdrivers & Drivers
Product Size:
3/8"
Product Group:
Hand Tools

Irwin 3548521C – Frequently Asked Questions

1) Does the Irwin 3548521C nutsetter fit a 3/8 inch hex head screw or is 3/8 inch the drive shank?
3/8 inch is the fastener size the nutsetter drives, not the shank. The socket body itself measures 9/16 inch in diameter, which is the outside of the socket wall around that 3/8 inch hex head. If you are shopping by hex head across the socket, you want a 3/8 inch nutsetter for 3/8 inch hex head sheet metal screws.
2) Will a 9/16 inch socket body clear inside sheet metal duct flanges and tight corners?
The outside of the socket measures 9/16 inch, so that is the clearance you need to plan around when driving screws against a flange, in a duct seam, or next to a standing rib on roofing panel. Anything tighter than 9/16 inch of clear space around the fastener head will foul the socket wall.
3) What does Irwin's lobular nutsetter design actually do differently?
A lobular socket grips the flats on the sides of the hex head instead of loading the corners. That matters on sheet metal screws, where rounding a corner means the screw spins free and has to be cut out. It also leaves extra room at the corners, so paint or powder coat build-up on a pre-finished panel screw does not stop the socket from seating fully.
4) Does this nutsetter hold the screw by itself so I can start a fastener one-handed?
Yes, it is a magnetic nutsetter. The magnet holds a hex head screw in the socket so you can reach overhead on duct or set a panel screw without pinching the fastener with your free hand.
5) How does the Irwin 3548521C mount in a drill or impact driver?
The connection is hexagonal, so it seats in a standard hex bit holder, a quick-change chuck, or a three-jaw drill chuck. It is a bit-style nutsetter, not a square-drive socket, so it goes straight into a driver rather than onto a ratchet.
6) Is this the right nutsetter for HVAC duct assembly and metal roofing screws?
That is the intended work. It is built for sheet metal screws and other hex head fasteners, and the typical uses named for it are sheet metal fabrication and installation, HVAC ductwork, roofing and siding fasteners, and general construction and maintenance. For a hex head of a different size across the flats you need a different nutsetter size, since this one is dedicated to 3/8 inch.
7) Is the Irwin 3548521C sold as a pack or a single piece?
One nutsetter per pack. If you are stocking a van or an MRO crib and want spares for crews running self-drilling screws all day, order multiples, since each order line is a single piece.
How fast can I get the Irwin 3548521C 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 Irwin 3548521C come with a warranty?
Absolutely. The Irwin 3548521C 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 Irwin 3548521C?
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 Irwin 3548521C from ZenSupply?
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